JPS61271045A - Cyclone separator - Google Patents

Abstract

PURPOSE:To decrease the pressure drop and to increase the separation efficiency of the titled separator by joining a side wall of a large-diameter cyclone to a fluid introduction port of a small-diameter cyclone and joining the gas outlet ducts of both cyclones to the outlet chutes of a raw material. CONSTITUTION:To a gas sent from a cyclone 2 is incorporated a powdery raw material fed through a chute 11 in a joining duct 5 and introduced into a cyclone 1. One part of gas which is concentrated to a peripheral wall with the rotary flow of the inside of the cyclone 1 and is high in the dust-laden concn. is introduced into a newly erected small-diameter cyclone 13 through an optional peripheral wall 12 of the cyclone 1. The gas treated in the cyclone 13 is passed through an outlet duct 16 and joined with a greater part of the gas treated in the cyclone 1 in an outlet duct 4. The raw material separated and collected in the cyclone 1 and the small-diameter cyclone 13 is flowed down through the raw material chutes 7, 15 and joined in a joining duct 6.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves installing new cyclones with a smaller diameter adjacent to several existing cyclone separators in a cement raw material preheating device, and discharging gas with a higher dust concentration than the existing cyclone side walls. A part of it is introduced into the small diameter cyclone.

The present invention relates to a cyclone separation device that can lower the outlet flow velocity of the existing cyclone without changing the inlet flow velocity, thereby reducing pressure loss and improving dust collection efficiency.

[Prior art]

Cyclone separators use centrifugal force to separate powder and granules in fluids, and because they have a simple structure and excellent performance, they are often used in preheating devices for cement raw materials, etc. However, in recent years, the amount of heat has increased.

There is an urgent need to reduce each power consumption unit, so the existing cyclones used in this preheating device may be modified or several new cyclones may be installed to reduce pressure loss in the preheating device and improve dust collection efficiency. Aim for improvement.

These are being addressed.

Regarding the modification of these existing cyclones, it is also possible to enlarge or change the shape of the cyclone's gas inlet/outlet duct 1 body 9 cylinder to lower pressure loss and improve dust collection efficiency.

Regarding the installation of additional cyclones, there is a method of installing several more cyclones on top of the cyclone at the top of the preheating device, or installing several new cyclones in parallel with the existing cyclones.

[Problem that the invention seeks to solve]

If several new cyclones are added to the top stage, the thermal efficiency will improve, but the pressure loss will increase, so in order to reduce the pressure loss in the preheating device to the current level or further reduce it, the other cyclones must also be modified. This is necessary, requiring huge construction costs and long-term construction work.

Additionally, the method of adding a new cyclone of the same size or smaller diameter in parallel with the existing cyclone increases the cross-sectional area of the flow path by the amount of the new installation, slows the gas flow rate, and reduces pressure loss, but No significant effect was expected in improving dust efficiency.

[Means for solving problems]

The present invention was carried out in order to further improve the effects of conventional modifications.In a cyclone separation device in which cyclones are connected in several stages, a small diameter cyclone is provided adjacent to one of the large diameter cyclones.

and connecting the side wall other than the fluid inlet of the large diameter cyclone and the fluid inlet of the small diameter cyclone at the same level, and connecting the gas outlet duct of the small diameter cyclone to the gas outlet duct of the large diameter cyclone; A cyclone separation device was constructed in which the raw material outlet chute of a small-diameter cyclone and the raw material outlet chute of a large-diameter cyclone were respectively connected to a lower cyclone and a connecting duct connecting the lower cyclone.

[Effect]

In the device of the present invention, the fluid consisting of gas containing powder enters tangentially from the upper side of the large-diameter cyclone, and the large-diameter cyclone performs the conventional separation action between powder and gas. , a part of the fluid with high dust content enters a small diameter cyclone.

Here, too, the action of separating powder and gas is performed.

In the device of the present invention, the gas flowing in from the inlet duct of the large-diameter cyclone concentrates on the peripheral wall of the cyclone due to the swirling flow inside the cyclone, increasing the dust concentration. Since the water is introduced into a small-diameter cyclone from any side wall of the pipe for processing, the subsequent swirling flow within the large-diameter cyclone is reduced, collision with the introduction duct flow is alleviated, and pressure loss is reduced.

On the other hand, the swirling force of the gas passing through the gas outlet duct of the large-diameter cyclone is weakened by the amount of gas processing performed by the small-diameter cyclone, and pressure loss is also reduced here.

In addition, part of the gas with high dust content that has started swirling on the side wall of the large-diameter cyclone is introduced into the small-diameter cyclone for processing, so powder and granules are then swirled and flow toward the inlet duct of the large-diameter cyclone. quantity is reduced, and as a result, less particulate matter is entrained in the exhaust gas. Since the amount of swirling gas in the large-diameter cyclone is reduced, re-scattering with newly inflowing gas is alleviated, and the short path of the powder to the gas outlet duct of the large-diameter cyclone is also reduced.

On the other hand, a small-diameter cyclone into which gas with a high concentration of dust is introduced is small and has better dust collection efficiency than a large-diameter cyclone.

In this way, in the two aspects of the present invention, pressure loss is reduced.

Separation of powder and gas is performed in a state where dust collection efficiency is also improved.

〔Example〕

Next, the present invention will be explained in more detail with reference to embodiments shown in the drawings.

In Figures 1 and 2, 1 is one large diameter cyclone, 2 is the lower stage cyclone, 3 is the lower stage large diameter cyclone,
4 is the gas outlet duct of cyclone 1, 5 is cyclone 1
A connecting duct connecting the population and the gas outlet of cyclone 2, 6 a connecting duct connecting the inlet of cyclone 2 and the gas outlet of cyclone 6, and 7 connecting the raw material outlet of cyclone 1 and the connecting duct 6. raw material chute, 8.
9 is each cyclo/2. Otsu's raw material chute.

10 is a powder raw material supply device, 11 is its raw material chute, and 12 is a side wall of the cyclone 1, which are already installed.

In the existing equipment configured in this way, a new cyclone 13 with a smaller diameter is installed adjacent to one large-diameter cyclone 1, and an arbitrary side wall 12 of the cyclone 1 and the population of the small-diameter cyclone 13 are connected to the cyclone 1. 1 or the side wall 12 of the large diameter cyclone 1.
Fluid introduction duct 14 with a newly installed small-diameter cyclone 13
At.

It is connected to the cyclone 1 at the same level, and the gas outlet duct 16 of the small diameter cyclone 13 is connected to the large diameter cyclone 1.
The raw material outlet chute 15 of the small-diameter cyclone 16 is connected to the connecting duct 6 connecting the cyclones 2 and 3 via a new booster fan 17.

By doing this, the gas from cyclone 2 will be
The connecting duct 5 enters the cyclone 1 containing the powdered raw material supplied from the raw material chute 11.

Here, a part of the gas with a high concentration of dust concentrated on the peripheral wall due to the swirling flow in the cyclone 1 is transferred from an arbitrary side wall 12 of the cyclone 1 to a newly installed small-diameter cyclone 13, either directly or with a newly installed fluid. At the introduction duct 14, cyclone 1
will be introduced at the same level.

The gas processed by the newly installed cyclone 13 is newly installed.

Most of the gas treated in the cyclone 1 joins the gas outlet duct 4 of the cyclone 1 through the newly installed booster fan 17 from the gas outlet duct 16.

In addition, large diameter cyclone 1. The raw material separated and collected from the gas in each of the newly installed small-diameter cyclones 13 flows down the raw material chute 7 and the newly installed raw material chute 15, and joins in the connecting duct 6.

Therefore, in the present invention, compared to the conventional cyclone consisting only of large cyclones, as shown in Figs. Depending on the swirling flow of the gas, it concentrates on the peripheral wall of the cyclone 1 and the concentration of dust increases, but a part of this gas is introduced from any side wall 12 of the parent cyclone 1 to the newly installed small diameter cyclone 13. Because of the processing, the subsequent swirling flow within the parent cyclone 1 is reduced, the collision with the introducing duct flow is alleviated, and the pressure loss is reduced.

On the other hand, the swirling force of the gas passing through the gas outlet duct 4 is weakened by the gas treatment performed by the newly installed small-diameter cyclone 13, and the pressure loss is also reduced here.

In addition, in order to introduce some of the gas with high dust content that has started swirling on the side wall of R cyclone 1 to the newly installed small-diameter cyclone 13 for processing, it then rotates and flows toward the inlet duct 5 of parent cyclone 1. The amount of powder particles flowing in is reduced, and as a result, the amount of powder particles entrained in the exhaust gas is reduced. Since the amount of swirling gas in the parent cyclone 1 decreases, re-scattering with newly inflowing gas is also alleviated, and the gas outlet duct 4 here
The short path of powder to is also reduced.

On the other hand, the newly installed small-diameter cyclone 13 into which gas with a high dust concentration is introduced is small and has better dust collection efficiency than the parent cyclone.

For the above reasons, pressure loss is reduced and dust collection efficiency is improved.

Further, the side wall 12 of the cyclone 1 refers to the area between a and b in Fig. 3-4.

The flow velocity at the entrance and exit of the existing parent cyclone 1 is high (V = 20 m/
If the pressure loss is high and the dust collection efficiency is low, the inlet flow velocity of R cyclone 1 should be the same, and the other air volume should be adjusted so that the outlet flow velocity is appropriate (■ = 15 to 20 m/8 θC). Processing using the newly installed small-diameter cyclone 13 improves both pressure loss and dust collection efficiency. In this way, the present invention
If the flow velocity at the inlet and outlet of the cyclone separator in the existing cement raw material preheating equipment is high, install new cyclones with smaller diameters adjacent to several of them, and remove some of the gas with a higher concentration of dust from the side walls of the existing large diameter cyclones. By processing most of the other gases in the newly installed small-diameter cyclone and in the existing small-diameter cyclones, pressure loss between the small-diameter cyclone inlet and outlet can be reduced and dust collection efficiency can be improved. It is possible to achieve great results after modification.

Additionally, since the new cyclone has a small diameter, construction is easy, inexpensive, and shortens the construction period.

〔effect〕

In the present invention, since a small-diameter cyclone is provided as described in the claims, two
Reduces pressure loss during separation.

Dust collection efficiency can also be improved. Furthermore, when a small-diameter cyclone is newly installed next to a large-diameter cyclone, the newly installed cyclone has a small diameter and is small, so construction is easy, inexpensive, and takes a short construction period.

[Brief explanation of drawings]

1 and 2 are front views showing different embodiments of the present invention, and FIGS. 6(a) and 6(b) are 1
A plan view and a longitudinal sectional view showing the state of powder flow with an enlarged view of the part, and Figures 4(a) and (b) are plane views showing the state of flow of the powder with a part of Fig. 2 enlarged. FIG. 1...Large diameter cyclone (parent cyclone). 2.6...Large diameter cyclone, 4...Gas outlet duct), 5.6...Connection duct), 7,8,9.
15... Raw material chute, 10... Powder raw material supply device, 12... Cyclone side wall, 15... Small diameter cyclone, 14... Inlet duct, 16...
Gas outlet duct, 17...φ booster fan

Claims (1)

[Claims] In a cyclone separation device in which several stages of cyclones are connected, a small-diameter cyclone is provided adjacent to one of the large-diameter cyclones, and the side wall other than the fluid inlet of the large-diameter cyclone and the fluid introduction port of the small-diameter cyclone are connected. The gas outlet duct of the small-diameter cyclone is connected to the gas outlet duct of the large-diameter cyclone, and the raw material outlet chute of the small-diameter cyclone and the raw material outlet chute of the large-diameter cyclone are connected to the gas outlet duct of the lower cyclone. and a cyclone separation device connected to the connecting duct that connects the lower cyclone.