Nitrogen oxide treatment device

Abstract

The utility model relates to the technical field of industrial waste gas purification, in particular to a nitrogen oxide treatment device which comprises a desulfurizing tower and a steam generator, the air inlet end of the desulfurization tower is communicated with a desulfurization smoke pipe, the air outlet end of the steam generator is provided with a steam pipe, and the air outlet end of the steam pipe is communicated with an inner cavity of the desulfurization smoke pipe. According to the utility model, the steam generator is additionally arranged, and the steam pipe is connected into the desulfurization smoke pipe, so that nitrogen oxides in the waste gas can be absorbed by water vapor before the waste gas enters the desulfurization tower.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial waste gas purification, in particular to a nitrogen oxide treatment device. Background Art

[0002] The steel industry has long been considered a highly polluting and energy-intensive industry. With the current trend toward environmental protection becoming increasingly pronounced, it is imperative for the steel industry to strengthen environmental governance and promote ultra-low emission transformation. Currently, nitrogen oxides in exhaust gas are treated using specialized denitrification equipment, but this equipment carries high investment and operating costs. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a nitrogen oxide treatment device capable of treating nitrogen oxides in exhaust gas.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a nitrogen oxide treatment device, including a desulfurization tower and a steam generator; the air inlet end of the desulfurization tower is connected to a desulfurization flue pipe, and a steam pipe is provided at the air outlet end of the steam generator, and the air outlet end of the steam pipe is connected to the inner cavity of the desulfurization flue pipe.

[0005] Furthermore, the desulfurization flue gas pipe includes an air intake section, an ascending section and a high section connected in sequence; the installation height of the air intake section is lower than the installation height of the high section, and the connection between the air intake section and the ascending section is connected to the air outlet end of the steam pipe.

[0006] Furthermore, a regulating valve is provided on the steam pipe.

[0007] Furthermore, a pressure gauge is provided on the steam pipe.

[0008] Furthermore, a valve is provided on the steam pipe.

[0009] Furthermore, the steam generator is a steam drum that provides steam to the heating furnace.

[0010] The beneficial effect of this utility model lies in that, unlike the existing technology, a steam generator is added and the steam pipe is connected to the desulfurization flue pipe, so that the nitrogen oxides in the exhaust gas can be absorbed by the water vapor before entering the desulfurization tower, thereby reducing the nitrogen oxide content in the exhaust gas. The exhaust gas then enters the desulfurization tower for desulfurization to meet the emission standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a structural schematic diagram of a nitrogen oxide treatment device proposed in the present utility model;

[0012] Figure 2 This is a system schematic diagram of a nitrogen oxide treatment device proposed in the utility model;

[0013] Description of labels:

[0014] 1. Desulfurization tower; 11. Desulfurization flue gas pipe; 111. Air intake section; 112. Rising section; 113. High-level section;

[0015] 2. Steam generator; 21. Steam pipe; 211. Control valve; 212. Pressure gauge; 213. Valve. DETAILED DESCRIPTION

[0016] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

[0017] Please refer to Figure 1 and Figure 2 As shown, the utility model is a nitrogen oxide treatment device, comprising a desulfurization tower 1 and a steam generator 2; the air inlet end of the desulfurization tower 1 is connected to a desulfurization flue 11, and the air outlet end of the steam generator 2 is provided with a steam pipe 21, and the air outlet end of the steam pipe 21 is connected to the inner cavity of the desulfurization flue 11.

[0018] Working Principle: Steam generator 2 injects steam into desulfurization flue pipe 11 via steam pipe 21. Oxygen compounds in the exhaust gas react with water and oxygen through diffusion and absorption to form nitric acid, thereby reducing the nitrogen oxide content in the exhaust gas. The exhaust gas then enters desulfurization tower 1, where it is converted into harmless substances such as sulfates, thereby meeting emission requirements.

[0019] In one embodiment, see Figure 1 As shown, the desulfurization flue pipe 11 includes an air intake section 111, an ascending section 112, and a high section 113 connected in sequence; the installation height of the air intake section 111 is lower than the installation height of the high section 113, and the connection between the air intake section 111 and the ascending section 112 is connected to the air outlet end of the steam pipe 21. The desulfurization flue pipe 11 is divided into the air intake section 111 and the high section 113 with an installation height difference connected by the ascending section 112, which can meet the requirements of on-site construction. At the same time, the air outlet end of the steam pipe 21 is connected to the connection between the air intake section 111 and the ascending section 112, which can not only use the pressure of the water vapor injected into the desulfurization flue pipe 11 to help the exhaust gas flow into the high section 113, but also the water vapor can stir the exhaust gas, so that the water vapor can better absorb the nitrogen oxides in the exhaust gas.

[0020] In one embodiment, see Figure 1 As shown, a regulating valve 211 is provided on the steam pipe 21. The regulating valve can be used to control the pressure of the water vapor injected into the desulfurization flue gas pipe 11 by the steam pipe 21, wherein the preferred injection water vapor pressure is 0.55 MPa to 0.65 MPa.

[0021] In one embodiment, see Figure 1 As shown, a pressure gauge 212 is provided on the steam pipe 21. On-site personnel can conveniently operate the opening of the regulating valve 211 according to the value displayed on the pressure gauge 212, thereby ensuring the absorption of nitrogen oxides in the exhaust gas.

[0022] In one embodiment, see Figure 1 As shown, a valve 213 is provided on the steam pipe 21. The valve 213 can be used to control the steam in the steam pipe 21 to be delivered to the desulfurization flue gas pipe 11, so as to achieve the purpose of safe operation.

[0023] In an optional embodiment, the steam generator 2 is a steam drum that provides steam to the heating furnace. Since the steam used by the steam drum to heat the heating furnace in steel production is relatively clean, the steam generated by the steam drum is preferably used to absorb nitrogen oxides in the exhaust gas to prevent other impurities from entering the exhaust gas and affecting the exhaust gas purification process.

[0024] Example 1

[0025] A nitrogen oxide treatment device, please refer to Figure 1 and Figure 2 As shown, it includes a desulfurization tower 1 and a steam generator 2. The desulfurization tower 1 has a desulfurization flue pipe 11 connected to the air inlet end. The desulfurization flue pipe 11 includes an air inlet section 111, an ascending section 112, and a high section 113 connected in sequence. The air inlet section 111 is installed at a lower height than the high section 113. A steam pipe 21 is provided at the air outlet end of the steam generator 2. The junction between the air inlet section 111 and the ascending section 112 is connected to the air outlet end of the steam pipe 21. The steam pipe 21 is provided with a regulating valve 211. The steam pipe 21 is provided with a pressure gauge 212. The steam pipe 21 is provided with a valve 213.

[0026] Working Principle: Steam generator 2 injects steam into desulfurization flue pipe 11 via steam pipe 21. Oxygen compounds in the exhaust gas react with water and oxygen through diffusion and absorption to form nitric acid, thereby reducing the nitrogen oxide content in the exhaust gas. The exhaust gas then enters desulfurization tower 1, where it is converted into harmless substances such as sulfates, thereby meeting emission requirements.

[0027] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the description and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A nitrogen oxide treatment device, characterized in that: It includes a desulfurization tower and a steam generator; the air inlet end of the desulfurization tower is connected to a desulfurization flue pipe, the air outlet end of the steam generator is provided with a steam pipe, and the air outlet end of the steam pipe is connected to the inner cavity of the desulfurization flue pipe; The desulfurization flue gas pipe includes an air intake section, an ascending section and a high section which are connected in sequence; the installation height of the air intake section is lower than the installation height of the high section, and the connection between the air intake section and the ascending section is connected to the air outlet end of the steam pipe.

2. The nitrogen oxide treatment device according to claim 1, characterized in that: The steam pipe is provided with a regulating valve.

3. The nitrogen oxide treatment device according to claim 2, characterized in that: The steam pipe is provided with a pressure gauge.

4. The nitrogen oxide treatment device according to claim 2 or 3, characterized in that: The steam pipe is provided with a valve.

5. The nitrogen oxide treatment device according to claim 1, characterized in that: The steam generator is a steam drum that provides steam to the heating furnace.

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