CN103801238B - A kind of bispin gas gas fast-mixing reactor - Google Patents

Abstract

The invention discloses a double-swirl gas-gas rapid mixing reactor, which comprises a reaction shell, the lower part of the reaction shell has an A gas inlet, and the top has a mixed gas outlet, and the reaction shell is vertically arranged Several layers of double-swirl components, the A gas inlet is located below the lowest layer of double-swirl components, and B gas inlet pipes are arranged above or below each layer of double-swirl components, and each layer of double-swirl components includes: a blind in the center plate; the small swirl vane arranged around the blind plate; the connection ring fixed on the periphery of the small swirl blade; the large swirl blade arranged around the connection ring; the bracket fixed on the periphery of the large swirl blade; the small swirl blade and The swirl direction of the large swirl blade is opposite. In the present invention, single-layer or multi-layer double-swirl flow trays are added inside the reactor, which improves the mixing uniformity of gas and gas, and is beneficial to the progress of the reaction.

Description

A double-swirl gas-gas rapid mixing reactor

technical field

The invention relates to the technical field of high-efficiency mixing and reaction of industrial gas and gas, in particular to a double-swirl gas-gas rapid mixing reactor.

Background technique

Dual swirl gas mixing is critical in industrial applications. For example, in the SCR process, the uniformity of ammonia gas and flue gas is the key to the catalytic efficiency, catalyst service life and system operation success. The more fully the ammonia gas is mixed with the flue gas, the higher the nitrogen oxide removal efficiency will be.

The utility model with the notification number CN203139999U discloses a gas mixing reactor, including an inner cylinder and an outer cylinder, the inner cylinder is arranged inside the outer cylinder, there is a first gas inlet above the inner cylinder, and there is a gas inlet above the outer cylinder The second gas inlet, an inner cyclone is arranged inside the inner cylinder, an outer cyclone is arranged between the inner cylinder and the outer cylinder, and the inner cylinder and the lower part of the outer cylinder respectively have a first gas outlet and a second gas outlet. Gas outlet. But its structure is relatively complicated, the cost is high, and it is not conducive to the transformation of the original chemical system.

Publication No. CN1326813A discloses a gas mixing device, including a first gas input pipe, a second gas input pipe, a mixing chamber, and one or more of them in the cross-sectional plane of the mixing chamber and perpendicular to the input pipe The gas distribution pipe and the mixed gas output pipe also have one or more gas output holes on the gas distribution pipe in the mixing chamber. However, its flux is not large, so the reactor volume is large, the floor area is large, and the requirements for the foundation load are relatively high.

Patent No. CN202315668U discloses an ammonia injection mixing system for an SCR denitrification device, which includes an ammonia injection grid and a flow equalizing pipe. The ammonia injection grid and the flow equalizing pipe are arranged in the inlet flue of the SCR reactor. The flow direction is located at the rear side of the ammonia injection grille, and the flow equalizers are arranged in parallel and evenly and indirectly on the cross-sectional area of the inlet flue. However, its structure is relatively complicated, its cost is high, and its energy consumption is large.

The Chinese invention patent with the notification number 102210992B discloses a swirl mixer, which at least includes a reaction container for holding liquid, and an air inlet is arranged on the container, and the feature is that an inner casing is arranged above the air inlet , a gas phase swirl channel is formed between the inner shell and the inner wall of the container or between the inner shell and the inner shell. An outer shell is arranged above the inner shell, and a liquid inlet is opened in the middle of the outer shell. A fluid swirl channel is formed between the gas phase swirl channel and the outer end of the fluid swirl channel to form a gas-liquid mixed flow swirl channel, the gas-liquid mixed flow swirl channel is located between the outer shell and the inner wall of the container or the outer shell and the outer shell between.

Contents of the invention

The invention provides a double-swirl flow gas-gas rapid mixing reactor. A single-layer or multi-layer double-swirl flow tray is added inside the reactor, which improves the mixing uniformity of gas and gas, and is beneficial to the reaction.

A double swirl gas rapid mixing reactor, including a reaction shell, the lower part of the reaction shell has an A gas inlet, and the top has a mixed gas outlet. The reaction shell is provided with several layers of double swirl along the vertical direction. As for the flow member, the A gas inlet is located below the double swirl member at the lowest layer, and the B gas inlet pipe is arranged above or below each double swirl member, and each double swirl member includes:

centrally located blind plate;

Small swirl vanes arranged around the blind plate;

The connecting ring fixed on the periphery of the small swirl vane;

Large swirl blades arranged around the connecting ring;

A bracket fixed on the periphery of the large swirl vane, which is fixed on the inner wall of the reaction housing;

The swirl directions of the small swirl blades and the large swirl blades are opposite.

According to the aerodynamic theory, the invention patent studies the mechanism of turbulent flow, especially the two-way vortex flow, simulates the flow mixing enhancement mechanism, develops advanced mixing enhancement technology, and effectively improves the mixing reaction efficiency. The device of the present invention mainly utilizes the two-way swirl flow enhanced mixing generated when the air flow passes through the double swirl flow plate, thereby improving the mixed reaction effect of the double swirl flow gas, and is especially suitable for the mixed reaction of various gases, such as ammonia and flue gas in SCR Mixing reaction of ozone and flue gas in hybrid, wet denitrification.

Preferably, the ratio of the gap area between the small swirl blades to the cross-sectional area of the reaction shell is 2-50%.

Preferably, the number of the small swirl vanes is 3-100.

As a preference, the rotation angle between the small swirl blade and the horizontal plane is 2-50°

Preferably, the ratio of the gap area between the large swirl blades to the cross-sectional area of the reactor is 5-60%.

As a preference, the number of the large swirl blades is 3-150 pieces.

Preferably, the rotation angle between the large swirl blade and the horizontal plane is 5-60°.

Preferably, the shape of the small swirl vane and the large swirl vane is triangular, rhombus or ellipse.

Preferably, the double swirl components are arranged in 1-4 layers, and the distance between two adjacent layers is 20-150 cm.

Further preferably, the double swirl member is arranged in 1-4 layers, and the distance between two adjacent layers is 20-150 cm; the ratio of the gap area between the small swirl blades to the cross-sectional area of the reaction shell 2-50%; the number of the small swirl blades is 3-100; the rotation angle between the small swirl blades and the horizontal plane is 2-50°; the gap area between the large swirl blades and the reaction The ratio of the cross-sectional area of the device is 5-60%; the number of the large swirl blades is 3-150 pieces; the rotation angle of the large swirl blades and the horizontal plane is 5-60°.

According to different working conditions, the parameters of the double swirl components can be properly selected. For example, for gas A with a small viscosity coefficient, the double-swirl component is set to 2 layers. By adopting the double swirl components, the rotation of the gas A is strengthened under the guiding action of the small swirl blades and the large swirl blades, a higher degree of turbulence is obtained, and double swirl flows in opposite directions are formed. Gas B enters the mixing reactor at the rear end or front end of the blind plate through the B gas inlet pipe. Under the action of double swirl flow, gas A and gas B are fully mixed evenly, thus promoting the reaction.

A most preferred technical scheme, the double swirl member is arranged as 2 layers, and the distance between adjacent two layers is 50cm; the ratio of the gap area between the small swirl blades to the cross-sectional area of the reaction shell is 30%; the quantity of the small swirl blades is 20; the rotation angle of the small swirl blades and the horizontal plane is 30 °; the ratio of the gap area between the large swirl blades and the cross-sectional area of the reactor 35%; the number of the large swirl blades is 40; the rotation angle between the large swirl blades and the horizontal plane is 40°.

Under the above-mentioned most preferred technical scheme, the mixing uniformity of A gas and B gas reaches more than 80%.

The beneficial effects of the patent of the present invention are as follows:

The patent of the present invention adds a single-layer or multi-layer double-swirl flow tray inside the reactor, and by using the mixing effect of the double-swirl flow, the mixing of gas and gas is more uniform, which is beneficial to the progress of the reaction. The patented internal structure of the invention is simple, and the investment cost is relatively low no matter for the transformation of the original device or the construction of a new device. The second phase of the present invention does not require a power system, and the operating cost is relatively low. In addition, the patent of the present invention is suitable for large-flux dual-swirl gas-gas mixing reactions.

Description of drawings

Fig. 1 is a structural schematic diagram of an embodiment of the device of the present invention.

Fig. 2 is a top view of Fig. 1 .

Fig. 3 is a schematic structural view of another embodiment of the device of the present invention.

The reference signs shown in the figure are as follows:

1-A gas inlet 2-reaction shell 3-mixed gas outlet

4-B gas inlet pipe 5-small swirl vane 6-connecting ring

7-big swirl blade 8-support 9-blind plate.

detailed description

As shown in FIGS. 1 to 3 , a double-swirl gas-gas rapid mixing reactor includes a reaction shell 2 and several layers of double-swirl components inside the reaction shell 2 .

The reaction shell 2 is a conventional cylindrical shell, the lower part of the reaction shell has an A gas inlet 1, the top of the reaction shell has a mixed gas outlet 3, and the reaction shell 2 is located at the A gas inlet 1 and the mixed gas Several layers of double swirl components are arranged between the outlets 3 from top to bottom.

Each layer of double swirl components includes: a blind plate 9 located at the center, a small swirl vane 5 arranged around the blind plate 9, a connecting ring 6 fixed on the periphery of the small swirl vane 5, and a large swirl vane arranged around the connecting ring 6 7 and the bracket 8 fixed on the periphery of the large swirl blade 7, the connecting ring 6 connects the small swirl blade 5 and the large swirl blade 7, and the bracket 8 fixes the double swirl component on the inner wall of the reaction shell 2. The swirl directions of the small swirl vanes 5 and the large swirl vanes 7 are opposite.

The double swirl component is set to 1-4 layers, and the distance between two adjacent layers is 20-150cm; the ratio of the gap area between the small swirl vanes to the cross-sectional area of the reaction shell is 2-50%; the small swirl The number of flow blades is 3-100 pieces; the rotation angle between the small swirl blades and the horizontal plane is 2-50°; the ratio of the gap area between the large swirl blades to the cross-sectional area of the reactor is 5-60%; the large swirl blades The number of flow blades is 3-150 pieces; the rotation angle between the large swirl blades and the horizontal plane is 5-60°.

The shapes of the large swirl vane and the small swirl vane are triangle, rhombus or ellipse.

The B gas inlet pipe is set above (as shown in Figure 1) or below (as shown in Figure 2) the double swirl flow member, and the gas outlet is directly facing the center of the blind plate 9.

An optimal implementation mode, the double swirl member is arranged in 2 layers, and the distance between adjacent two layers is 50cm; the ratio of the gap area between the small swirl vanes to the cross-sectional area of the reaction shell is 30%; The number of the small swirl blades is 20; the rotation angle of the small swirl blades and the horizontal plane is 30 °; the ratio of the gap area between the large swirl blades to the cross-sectional area of the reactor is 35%; the large swirl blades The number of flow blades is 40 pieces; the rotation angle between the large swirl blades and the horizontal plane is 40°.

The mode of operation of device of the present invention is as follows:

Under the guidance of the small swirl vane and the large swirl vane, the rotation of gas A is strengthened, and a double swirl flow in the opposite direction is formed; gas B enters the mixing reactor at the rear end or front end of the blind plate through the B gas inlet pipe; Under the action of double swirl flow, gas A and gas B are fully mixed evenly, thus promoting the reaction. Through the double-swirl flow gas-gas rapid mixing reactor, the gas can get a good uniformity and is conducive to rapid reaction.

Example 1

The mixing process of gas A and gas B was simulated on a 4000m ³ /h scale device. The length of the reactor is 3m, and a straight pipe is used to feed gas B into the flue, simulating the mixing process of gas A and gas B without the device of the present invention. The flow rate of gas A is 4000m ³ /h, the temperature of gas A is 100 degrees Celsius, the pressure is 1 atmosphere, the flow rate of gas B is 20m ³ /h, the temperature of gas B is 25 degrees Celsius, and the uniformity of gas B is 25%.

Example 2

Under the best implementation mode of the present invention, the mixing process of gas A and gas B is simulated on a 4000m ³ /h scale device. The length of the reactor is 3m, the flow rate of gas A is 4000m ³ /h, the temperature of gas A is 100 degrees Celsius, the pressure is 1 atmosphere, the flow rate of gas B is 20m ³ /h, the temperature of gas B is 25 degrees Celsius, and the uniform number of gas B is 80%.

Example 3

Under the best implementation mode of the present invention, the mixing process of gas A and gas B is simulated on a 6000m ³ /h scale device. The length of the reactor is 3m, the flow rate of gas A is 6000m ³ /h, the temperature of gas A is 90 degrees Celsius, the pressure is 1 atmosphere, the flow rate of gas B is 25m ³ /h, the temperature of gas B is 25 degrees Celsius, and the uniform number of gas B is 85%.

Claims (1)

1. a bispin gas gas fast-mixing reactor, comprise reactor shell, the bottom of this reactor shell is with A gas access, top is with mixed gas outlet, it is characterized in that, along vertically to being provided with some layers of double-cyclone component in described reactor shell, described A gas access is positioned at the below of bottom double-cyclone component, arrange B gas inlet pipe above or below every layer of double-cyclone component, every layer of double-cyclone component comprises:

Be positioned at the blind plate at center;

Around the little swirl vane that blind plate is arranged;

Be fixed on the connecting ring of little swirl vane periphery;

Around the maelstrom blade that connecting ring is arranged;

Be fixed on the support of maelstrom blade periphery, this support is fixed on the inwall of reactor shell;

The eddy flow direction of described little swirl vane and maelstrom blade is contrary;

The shape of described little swirl vane and maelstrom blade is triangle, rhombus or ellipse; Described double-cyclone component is set to 1-4 layer, and the spacing between adjacent two layers is 20-150cm; Interval area between described little swirl vane and the ratio of reactor shell cross-sectional area are 2-50%; The quantity of described little swirl vane is 3-100 sheet; The anglec of rotation of described little swirl vane and horizontal plane is 2-50 °; Interval area between described maelstrom blade and the ratio of cross-sectional reactor area are 5-60%; The quantity of described maelstrom blade is 3-150 sheet; The anglec of rotation of described maelstrom blade and horizontal plane is 5-60 °.