CN205216581U - Can realize device of flue gas desulfurization denitration simultaneously - Google Patents

Abstract

The utility model relates to a device capable of simultaneously realizing flue gas desulfurization and denitration, which comprises a desulfurization and denitrification tower, the top of the desulfurization and denitrification tower is provided with a gas outlet, and the bottom is provided with a liquid outlet; the upper part of the side wall of the desulfurization and denitrification tower is provided with a liquid The lower part of the side wall is provided with a gas inlet; the upper part of the desulfurization and denitrification tower is provided with a demister and a primary liquid distributor, the primary liquid distributor is located below the demister, and the liquid inlet is located between the demister and the primary liquid Between the distributors; the middle part of the desulfurization and denitrification tower is provided with a number of packing layers at intervals, and a secondary liquid distributor is provided between adjacent packing layers. The packing layer is composed of a number of wire mesh layers with catalysts; the The liquid outlet is connected with a liquid storage tank. The device has a simple structure and high integration, and can effectively remove SO ₂ and NOx simultaneously in the same tower, which greatly reduces the complexity of the existing desulfurization and denitrification system, saves infrastructure, reduces costs and energy consumption.

Description

A device capable of simultaneous desulfurization and denitrification of flue gas

technical field

The utility model belongs to the technical field of desulfurization and denitrification equipment, and in particular relates to a device capable of simultaneously realizing flue gas desulfurization and denitrification.

Background technique

my country is one of the few big countries in the world that uses coal as its main energy source, and coal consumption in China accounts for about 70% of primary energy consumption, and will account for about 60% by 2050. SO ₂ and NOx are important air pollutants emitted by coal-fired thermal power plants. The acid rain and photochemical smog formed by these pollutants in the atmosphere seriously threaten human health and destroy the ecological environment. In order to completely change this trend of increasing pollution and realize the sustainable development of human beings, it is necessary to control SO ₂ and NOx.

At present, the most mature and widely used flue gas desulfurization and denitrification technology in my country is the traditional lime/limestone method (FGD) combined with ammonia selective catalytic redox method (SCR), but two technologies and two sets of devices are required for desulfurization For denitrification, although the desulfurization and denitrification efficiency is high, there are defects such as complex structure of desulfurization and denitrification equipment, large floor area, high investment cost and high operation cost. Therefore, finding a device with simple equipment, low operating cost and high desulfurization and denitrification efficiency is the key to solving this problem.

Utility model content

The purpose of the utility model is to overcome the defects of the prior art and provide a device capable of simultaneously realizing flue gas desulfurization and denitrification. The device has simple structure, low operating cost and good desulfurization and denitrification effects.

In order to achieve the above object, the utility model adopts the following technical solutions:

A device capable of simultaneous desulfurization and denitrification of flue gas, comprising a desulfurization and denitrification tower, the top of the desulfurization and denitration tower is provided with a gas outlet, and the bottom is provided with a liquid outlet; the upper part of the side wall of the desulfurization and denitrification tower is provided with a liquid inlet, and the side wall The lower part of the desulfurization and denitrification tower is provided with a gas inlet; the upper part of the desulfurization and denitrification tower is provided with a demister and a primary liquid distributor, the primary liquid distributor is located below the demister, and the liquid inlet is located between the demister and the primary liquid distributor ; The middle part of the desulfurization and denitrification tower is provided with several packing layers at intervals, and a secondary liquid distributor is arranged between adjacent packing layers, and the packing layer is composed of several wire mesh layers placed with catalysts; the liquid outlet is connected to There is a liquid storage tank.

Specifically, the primary liquid distributor is a spray liquid distributor.

Compared with the prior art, the utility model has the beneficial effects:

The device of the utility model has simple structure and high integration, and can effectively remove SO2 and NOx simultaneously in the same tower, thereby realizing high _- efficiency desulfurization and denitrification, greatly reducing the complexity of the existing desulfurization and denitrification system, saving infrastructure, reducing cost and operating energy consumption.

Description of drawings

Fig. 1 is a structural schematic diagram of the device capable of simultaneously realizing flue gas desulfurization and denitrification described in the present invention.

detailed description

The utility model will be described in further detail below in conjunction with the accompanying drawings, but the protection scope of the utility model is not limited thereto.

Example 1

As shown in FIG. 1 , a device capable of simultaneous desulfurization and denitrification of flue gas includes a desulfurization and denitrification tower 5 with a gas outlet 1 at the top and a liquid outlet 10 at the bottom. The upper part of the side wall of the desulfurization and denitrification tower 5 is provided with a liquid inlet 3 , and the lower part of the side wall is provided with a gas inlet 9 . The upper part of the desulfurization and denitrification tower 5 is provided with a demister 2 and a primary liquid distributor 4, the primary liquid distributor 4 is located below the demister 2, and the liquid inlet 3 is located between the demister 2 and the primary liquid distributor 4 Between; the middle interval in the desulfurization and denitrification tower 5 is provided with an upper packing layer 6 and a lower packing layer 8, and a secondary liquid distributor 7 is arranged between the adjacent upper packing layer 6 and the lower packing layer 8, and the upper packing layer 6 and the lower packing layer 8 are composed of several wire mesh layers with catalyst placed (the wire mesh layers can be horizontally fixed or clamped on the inner wall of the desulfurization and denitrification tower 5, and the wire mesh layers are used to support the catalyst). The liquid outlet 10 provided at the bottom of the desulfurization and denitrification tower 5 is connected with a liquid storage tank 11 . The primary liquid distributor 4 is a spray liquid distributor.

When using the device described in the utility model, the catalyst is packed into the desulfurization and denitrification tower 5 to form the upper packing layer 6 and the lower packing layer 8. The loading capacity of the catalyst is 1/2 of the volume of the desulfurization and denitrification tower 5, and the concentration is 0.3mol/L. The hydrogen peroxide enters the interior of the desulfurization and denitrification tower 5 from the liquid inlet 3 and is sprayed on the catalyst through the primary liquid distributor 4, and reacts to generate strong oxidizing free radical·OH to form Fenton's reagent. The secondary liquid distributor 7 is arranged between the upper packing layer 6 and the lower packing layer 8, so that the hydrogen peroxide catalyzed by the upper packing layer 6 can be distributed evenly again. The desulfurization and denitrification tower 5 does not need to be heated. The flue gas enters through the gas inlet 9 (the flue gas flow rate is 8000m ³ /h), and fully contacts with the reaction liquid to react during the ascent process, so that the NOx and SO ₂ in the flue gas are completely oxidized and absorbed, thereby completing desulfurization and denitrification. The flue gas after desulfurization and denitration is demisted by the top demister 2 and then discharged from the gas outlet 1 (the residence time of the flue gas in the tower is about 20 minutes). The nitric acid and sulfuric acid raffinate produced by the reaction are discharged from the tower bottom liquid outlet 10 to the liquid storage tank 11 as industrial raw materials for further recycling.

The catalyst used above can be prepared by the following method: roast the crushed magnetite with a specific surface area of 200-300m ² /g at 700°C for 4h, cool it to 25°C, add the magnetite to 35wt % nano-TiO ₂ solution (impregnation solution), let it stand for 24 hours and then dry it at 110°C so that the mass ratio of magnetite to nano-TiO ₂ is 3.5:1, and then roast it at 1100°C for 7 hours.

Adopt the device described in the utility model, its desulfurization efficiency is more than 97%, and the denitrification efficiency is more than 78%,

Finally, it should be noted that: the above-mentioned embodiments are only used to illustrate and not limit the technical solutions of the present utility model, any equivalent replacement of the present utility model and any modification or partial replacement that does not depart from the spirit and scope of the present utility model shall be Covered within the protection scope of the claims of the present utility model.

Claims (2)

1. A device capable of simultaneously realizing flue gas desulfurization and denitrification, characterized in that it comprises a desulfurization and denitrification tower, the top of the desulfurization and denitrification tower is provided with a gas outlet, and the bottom is provided with a liquid outlet; the top of the desulfurization and denitrification tower side wall is provided with The liquid inlet, the lower part of the side wall is provided with a gas inlet; the upper part of the desulfurization and denitrification tower is provided with a demister and a primary liquid distributor, the primary liquid distributor is located below the demister, and the liquid inlet is located between the demister and the primary Between the liquid distributors; the middle interval in the desulfurization and denitrification tower is provided with a number of packing layers, and a secondary liquid distributor is arranged between adjacent packing layers, and the packing layer is composed of several wire mesh layers with catalysts; The liquid outlet is connected with a liquid storage tank. 2. The device capable of simultaneous desulfurization and denitrification of flue gas according to claim 1, characterized in that the primary liquid distributor is a spray liquid distributor.