A flue gas mixing reaction device for dry desulfurization

Abstract

The present invention proposes a flue gas mixing reaction device for dry desulfurization, comprising a dry powder injector, a flue gas distributor, a dry reactor and a dust collector. The flue gas distributor is circumferentially arranged with a plurality of air inlets, the air inlet being connected to a flue gas input pipe. The dry powder injector is connected to the flue gas distributor through the flue gas input pipe and the air inlet, and the desulfurizer dry powder and the flue gas are sent into the flue gas distributor through the flue gas input pipe for mixing. The interior of the flue gas distributor is provided with a spiral flue which extends gradually downward in a spiral shape from the outside to the inside. The outlet at the bottom of the spiral flue is connected to the dry reactor, and the flue gas and desulfurizer dry powder after cyclone mixing are input into the dry reactor. The outlet of the dry reactor is connected to the dust collector. The flue gas mixing reaction device can ensure uniform mixing, improve reaction efficiency and maximize the utilization rate of the desulfurizer.

Description

Technical field

[0001] The present invention relates to the technical field of desulfurization in high-pollution industries such as electricity, metallurgy, coking, and cement, and in particular to a flue gas mixing reaction device for dry desulfurization, which can be applied to dry and semi-dry desulfurization systems. [Background Technology]

[0002] Currently, with the increasingly severe environmental situation, environmental requirements for air pollution control are becoming increasingly stringent. Traditional wet desulfurization has the following problems: the generated products are liquid or sludge, which are difficult to handle, and the liquid or sludge can cause severe corrosion to equipment. There are also issues such as complex operating systems, large equipment, high power and water consumption, and high one-time investment. It is generally only suitable for large power plants. Dry desulfurization technology is widely used due to its simple process, easy operation, low investment and operation and maintenance costs, easy handling of desulfurization products, and no secondary pollution. Traditional dry methods generally use calcium-based desulfurizers. When the flue gas temperature exceeds 140°C, the calcium-based reaction activity is greatly reduced, making it unsuitable for dry desulfurization of high-temperature flue gases such as coking. Sodium-based baking soda is used as a desulfurizer, and the baking soda powder is sprayed directly into the flue through an injector. The slow gas-solid reaction rate and low desulfurization efficiency have become research focuses. The existing mixed reaction device has the following problems: the flue gas and baking soda powder are not mixed evenly in the flue, the mixed flue gas flow rate is too fast, the reaction time is short, the reaction efficiency is low, and the material consumption is large. [Summary of the invention]

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a flue gas mixing reaction device for dry desulfurization, which can ensure uniform mixing, improve reaction efficiency and maximize the utilization rate of the desulfurizer.

[0004] To achieve the above-mentioned purpose, the present invention proposes a flue gas mixing reaction device for dry desulfurization, comprising a dry powder injector, a flue gas distributor, a dry reactor and a dust collector. The flue gas distributor is circumferentially arranged with a plurality of air inlets, and the air inlet is connected to a flue gas input pipe. The dry powder injector is connected to the flue gas distributor through the flue gas input pipe and the air inlet, and the desulfurizer dry powder and the flue gas are sent into the flue gas distributor through the flue gas input pipe for mixing. The interior of the flue gas distributor is provided with a spiral flue that gradually extends downward in a spiral shape from the outside to the inside. The outlet at the bottom of the spiral flue is connected to the dry reactor, and the flue gas and desulfurizer dry powder after cyclone mixing are input into the dry reactor. The outlet of the dry reactor is connected to the dust collector.

[0005] Preferably, it further includes a guide cone and air intake guide vanes, wherein a spiral flue is provided inside the guide cone, and air inlets are arranged at intervals on the outer wall of the guide cone. The air inlets are arranged in sequence along the conveying direction of the spiral flue and are connected to the spiral flue, and air intake guide vanes are provided on the air inlets, and the air intake guide vanes form an angle of 45 degrees with the flow direction of the flue gas.

[0006] Preferably, the air inlets are rectangular, with 36 in total.

[0007] Preferably, the guide cone and the intake guide vane are made of NM400 high-strength wear-resistant steel plate.

[0008] Preferably, the spiral flue is further provided with a plurality of flue guide plates arranged along the flue gas conveying direction, the flue guide plates are arc-shaped plates, and an ash exhaust flue is formed between the flue guide plates and the outer circle of the spiral flue, and the output end of the ash exhaust flue is connected to the dry reactor through an ash powder collection pipe.

[0009] Preferably, the height of the flue guide plate is 1 / 4 of the height of the spiral flue cross section at which it is located.

[0010] Preferably, the flow velocity in the dry reactor is maintained at 1-5 m / s.

[0011] Preferably, the dust collector is a bag dust collector.

[0012] The beneficial effects of the present invention are as follows: through the coordination of a dry powder injector, a flue gas distributor, a dry reactor and a dust collector, the desulfurizer dry powder and the flue gas can be fully swirled and evenly mixed in the flue gas distributor and the dry reactor, and the flue gas flow rate is controlled to be maintained at 1-5m / s, thereby ensuring sufficient reaction time, improving reaction efficiency and maximizing the utilization rate of the desulfurizer.

[0013] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings.

Brief Description of the Drawings

[0014] Figure 1 This is a schematic structural diagram of a flue gas mixing reaction device for dry desulfurization of the present invention;

[0015] Figure 2 It is a structural schematic diagram of the smoke distributor of the present invention;

[0016] Figure 3 1. It is a schematic top view of the internal structure of the smoke distributor of the present invention;

[0017] Figure 4 It is a schematic top view of the installation position of the intake guide vane of the present invention. [Specific implementation method]

[0018] See Figures 1 to 4 The present invention provides a flue gas mixing reaction device for dry desulfurization, comprising a dry powder injector 10, a flue gas distributor 20, a dry reactor 30 and a dust collector 40. The flue gas distributor 20 is circumferentially arranged with a plurality of air inlets 11, and the air inlet 11 is connected to a flue gas input pipe. The dry powder injector 10 is connected to the flue gas distributor 20 through the flue gas input pipe 201 and the air inlet 11, and the desulfurizer dry powder and the flue gas are sent into the flue gas distributor 20 for mixing through the flue gas input pipe 201. The interior of the flue gas distributor 20 is provided with a spiral flue 2 that gradually extends downward in a spiral shape from the outside to the inside. The outlet 21 at the bottom of the spiral flue 2 is connected to the dry reactor 30, and the flue gas and desulfurizer dry powder after cyclone mixing are input into the dry reactor 30. The outlet of the dry reactor 30 is connected to the dust collector 40.

[0019] Further, see Figure 2 , further comprising a guide cone 1 and an air intake guide vane 3, wherein the guide cone 1 has a spiral flue 2, and the outer wall of the guide cone 1 is provided with air inlets 11 at intervals, and the air inlets 11 are sequentially arranged along the conveying direction of the spiral flue 2 and are connected to the spiral flue 2, and the air inlet 11 is provided with an air intake guide vane 3, and the air intake guide vane 3 forms an angle of 45 degrees with the flow direction of the flue gas, such as Figure 4 shown.

[0020] Furthermore, in this embodiment, the air inlets 11 are rectangular, and are provided in a total of 36. The guide cone 1 and the air inlet guide vanes 3 are both made of NM400 high-strength wear-resistant steel plates, which can withstand wear caused by severe friction of the mixture.

[0021] Further, see Figure 3 The spiral flue 2 is also equipped with several flue guide plates 4 arranged along the flue gas conveying direction. The flue guide plates 4 are curved plates. An ash discharge flue 41 is formed between the flue guide plates 4 and the outer circle of the spiral flue 2. The output end of the ash discharge flue 41 is connected to the dry reactor 30 through an ash collection pipe 5. The ash collection pipe 5 is a rectangular tube that effectively prevents the deposition of large ash particles in the flue gas distributor 2. Specifically, the height of the flue guide plates 4 is 1 / 4 of the height of the cross-section of the spiral flue 2 at which they are located.

[0022] Furthermore, the dust collector 60 is a bag dust collector, and the flow rate of the flue gas and desulfurizer dry powder mixture in the dry reactor 30 is maintained at 1-5m / s, allowing it sufficient reaction time and maximizing the reaction efficiency. Subsequently, the reaction products and smoke are captured by the bag dust collector at the outlet.

[0023] Working process of the present invention:

[0024] The present invention relates to a flue gas mixing reaction device for dry desulfurization. During use, a dry powder injector 10 feeds desulfurizer dry powder and flue gas into a flue gas distributor 20 through a flue gas input duct 201 and an air inlet 11 for mixing. The mixed flue gas enters through a side air inlet, passes through an intake guide vane 3, and then spirals downward within a guide cone 1 along a spiral flue 2 to enter a dry reactor 30. The intake guide vane 3 and guide cone 1 are made of NM400 high-strength wear-resistant steel plate, which is resistant to wear caused by the intense friction of the mixture. The flue gas and dry powder after swirling mixing are evenly distributed within the dry reactor 30. By providing a flue guide plate 4 on the spiral flue 2, large ash particles in the mixed flue gas pass through the flue guide plate 4 and enter the dry reactor 30 directly through an ash collection pipe 5. The ash collection pipe effectively prevents large ash particles from being deposited in the flue gas distributor 20. The flow rate in the dry reactor 30 is maintained at 1-5 m / s to allow sufficient reaction time and maximize the reaction efficiency. The reaction products and smoke are then captured by the bag filter 40 at the outlet.

[0025] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A flue gas mixing reaction device for dry desulfurization, characterized by: The invention comprises a dry powder injector (10), a flue gas distributor (20), a dry reactor (30) and a dust collector (40), wherein the flue gas distributor (20) is provided with a plurality of air inlets (11) arranged circumferentially, and the air inlets (11) are connected to a flue gas input pipe, and the dry powder injector (10) is connected to the flue gas distributor (20) through the flue gas input pipe (201) and the air inlet (11), and the desulfurizer dry powder is mixed with the flue gas through the flue gas input pipe (201). The flue gas is sent into the flue gas distributor (20) for mixing. The flue gas distributor (20) is provided with a spiral flue (2) extending gradually downward from the outside to the inside in a spiral shape. The outlet (21) at the bottom of the spiral flue (2) is connected to the dry reactor (30). The flue gas and desulfurizer powder after the cyclone mixing are input into the dry reactor (30). The outlet of the dry reactor (30) is connected to the dust collector (40). The dry reactor (30) also includes a guide cone (1) and an air inlet guide vane (3). The guide cone (1) has a spiral flue (2) therein, and the outer wall of the guide cone (1) is provided with air inlets (11) at intervals, and the air inlets (11) are arranged in sequence along the conveying direction of the spiral flue (2) and are connected to the spiral flue (2). The air inlet (11) is provided with an air inlet guide vane (3), and the air inlet guide vane (3) forms an angle of 45 degrees with the flow direction of the flue gas. The guide cone (1) and the air inlet guide vane (3) are both made of NM400 high-strength wear-resistant steel plate. The flow rate of the mixture of flue gas and desulfurizer dry powder in the dry reactor (30) is maintained at 1-5 m / s. The spiral flue (2) is further provided with a plurality of flue guide plates (4) arranged along the flue gas conveying direction. The flue guide plates (4) are arc-shaped plates. An ash exhaust flue (41) is formed between the flue guide plates (4) and the outer circle of the spiral flue (2). The output end of the ash exhaust flue (41) is connected to the dry reactor (30) through an ash powder collection pipe (5).

2. A flue gas mixing reaction device for dry desulfurization according to claim 1, characterized in that: The air inlets (11) are rectangular, and 36 in total are provided.

3. The flue gas mixing reaction device for dry desulfurization according to claim 1, characterized in that: The height of the flue guide plate (4) is 1 / 4 of the height of the cross section of the spiral flue (2) at the location where the flue guide plate (4) is located.

4. The flue gas mixing reaction device for dry desulfurization according to claim 1, characterized in that: The dust collector (40) is a bag dust collector.

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