JPH0144498Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a method for quantitatively feeding powder and granules such as pulverized coal, slaked lime, and calcium carbonate directly and with high precision from the storage chamber to the pneumatic transport pipe. Regarding the feeding device.

(Prior Art) A conventional quantitative feeding device for powder and granular materials such as pulverized coal, slaked lime, and calcium carbonate uses a quantitative feeder to discharge granular material from a hopper in a fixed amount from its chute, The powder discharged from the chute is sent to an air nozzle chamber provided below the chute, conveyed by jet air, and fed to a boiler or the like.

In addition, we have also obtained a patent as a powder and granular material feeding device.
Specification No. 11365 is known, which has a device that opens and closes two vertically aligned chambers by the action of compressed air, a delivery device is provided at the bottom, and an air introduction pipe and an air introduction pipe are provided in the lower part. The transport pipes are placed opposite each other.

(Problem to be solved by the invention) In a conventional quantitative feeding device using a chute air nozzle, powder and granules are subject to changes in the discharge state from the chute and fluctuations in negative pressure in the falling conveyance path from the discharge chute to the air nozzle. This results in uneven powder distribution on the cross-sectional area of the chute and an unsteady falling state, and the conveyance of powder and granules by the air nozzle is not always constant, causing pulsation, and furthermore, the powder and granules are If the powder is not completely mixed with air and transported by high-pressure air, the specific gravity of the powder and granules will separate and the powder will settle at the bottom of the conveyance path.
The amount of powder and granular material fed to a boiler etc. fluctuated considerably over time, resulting in a drawback that highly accurate feed amount control was not possible.

Furthermore, the apparatus described in Patent No. 111365 does not have a fixed quantity supply function, and the powder particles cause arching in the lower part of the lower chamber, making it difficult to supply a fixed quantity with high precision. A device described in Japanese Patent Publication No. 48-30312 is also known, but this also tends to cause arching in the hopper, making it impossible to move the powder smoothly, and furthermore, the air pressure in the air transport pipe and the air pressure acting on the top surface of the hopper are insufficient. This difference causes the flow of powder and granules in the rotating blades and hopper to be disrupted, and in addition, the powder and granules are fed from the hopper to the rotating blades through a narrow opening, resulting in a uniform powder and granular material. However, it was still difficult to provide a stable and quantitative supply with high accuracy because the filling between the rotating blades was not ensured.

The object of the present invention is to solve these conventional drawbacks and provide a practical powder/granular quantitative feeding device that has a simple structure, can be manufactured at low cost, and is capable of pneumatic transport with high feeding accuracy. .

(Means for Solving the Problem) The gist of the present invention that solves the problem is that a plurality of compartmental partition plates are installed at the bottom of the storage chamber 1 that temporarily stores powder and granular materials such as pulverized coal supplied from a hopper, etc. A rotary metered supply board 4 with 2 protruding radially on the outer periphery is rotatably installed at a position where a part of the rotation locus of the partition wall plate 2 protrudes from the chamber wall of the storage chamber, and The protruding part from 1 is stored in storage chamber 1
The pneumatic feed riser pipe 5 is connected to the openings in the upper and lower walls of the supply plate part casing, and the air flow in the pneumatic feed riser pipe is divided. It passes through the rotation locus area of the bulkhead plate 2, and also connects the upper wall, lower wall, and side wall of the supply plate portion casing 12 with the partition bulkhead plate 2.
A fixed quantity storage chamber 3 for powder and granular material sealed between the supply plate part casing and a storage chamber 1
A closing means such as a rotary valve 11 capable of shutting off the powder and the air is provided in the middle of the powder input path connected to the upper part of the storage chamber 1, and the space above the storage chamber 1 and the space inside the pneumatic feed riser pipe 5 are communicated. This is a powder quantitative feeding device which is provided with a pressure equalizing pipe 10.

(Function) In this invention, powder and granules are charged into the storage chamber 1 from a powder and granule material input path to a required level, and then the powder and granule material input path is closed by a closing means provided in the middle thereof. As a result, the space above the storage chamber 1 is reduced to the pressure equalizing pipe 10.
The air pressure in the upper space of the storage chamber 1 can be made equal to the air pressure in the pressure equalization pipe 10, and therefore the rotary quantitative supply board 4
The air pressure from the storage chamber acting on the air pressure and the air pressure from the air pressure feed riser pipe 5 are equal, and there is no differential pressure.
Eliminate turbulence in the flow of powder and granular material due to air pressure. The powder and granular material in the storage chamber 1 fills the space between the compartment partition plates 2 of the rotary quantitative supply board 4 at its bottom, is rotated and transferred as the rotary quantitative supply board 4 rotates, and is connected to the outer periphery of the storage chamber 1. The feed plate portion is fed into the casing 12. The powder and granules sent to the supply panel part casing are scraped by the upper wall, lower wall, and side wall, and a predetermined amount of the powder and granules are placed in the quantitative storage chamber 3 formed between the compartment partition plate 2. Filled with pneumatic feed riser line 5
is sent to the location. At this position, the powder and granules filled between the compartment partition plates are forcibly conveyed together with the air while being strongly agitated by the air flow of the pneumatic feed riser pipe 5. The amount of powder and granules conveyed through the pneumatic feed riser pipe 5 is proportional to the volume of the quantitative storage chamber 3 and the rotational speed of the rotating quantitative supply board.

In this way, the powder and granules in the storage chamber 1 are quantified in the supply plate part casing 12 and immediately transported by air through the pneumatic feed riser pipe 5, and processes such as pulsation and specific gravity separation that impair the quantification accuracy are caused along the way. This makes it easy to maintain the accuracy of quantitative measurements.

In addition, the powder particles adhering to the outer peripheral edges of the compartment partition plate 2 and the rotary supply plate 4 are removed by the air flow, and can be constantly maintained in a non-adhesive state.

As described above, the present invention provides that the powder and granules are directly sent from the storage chamber to the pneumatic feed riser pipe through the supply plate part casing 12, and that the air flow is directed to the partition partition plate,
To remove powder and granules attached to the outer periphery of the rotating supply board, and to prevent a pressure difference from occurring between the air pressure from inside the storage chamber that acts on the rotating supply board through the pressure equalization pipe and the air pressure from the pneumatic feed riser pipe side. This made it possible to supply high-precision quantitative quantities. Incidentally, it goes without saying that the quantitative value of the powder or granular material to be supplied can be changed by controlling the rotation speed of the rotary supply plate.

(Embodiment) The embodiment shown in Figs. 1 and 2 is an example of a device for feeding fine powder in a fixed amount to a boiler, in which a rotating fixed-quantity supply plate 4 having a diameter smaller than the radius of the storage chamber 1 is placed at the bottom of the storage chamber 1. It is accommodated in the recessed part 13, and about 60% of it is the storage chamber 1.
The remaining 40% is the supply panel part casing 1
It is within 2. Furthermore, this is an example in which a rotary valve 11 is employed as a closing means provided in the middle of the powder input path.

In the figure, reference numeral 6 denotes a rotational drive shaft of the rotary quantitative supply plate 4, 7 a stirring blade, and 7' a scraping rod for preventing arching of the storage chamber 1. Reference numeral 8 designates a feed pipe connected to the pneumatic feed riser pipe 5 to a boiler or the like, and reference numeral 9 designates an opening in the side wall of the storage chamber 1 for allowing a portion of the rotary constant supply plate 4 to protrude outside the storage chamber 1.

Incidentally, the rotary metering supply plate 4 of the present invention does not necessarily need to be accommodated in the bottom recessed part 13 of the storage chamber 1.

(Effects of the invention) As described above, according to the invention, the powder and granules in the storage chamber are quantified at the supply panel casing and immediately sent to the pneumatic feed riser pipe, and the pressure equalization pipe By ensuring that there is no differential pressure in the air pressure acting on the rotating fixed-quantity supply board, and by allowing the air flow in the pneumatic feed riser pipe to remove powder and granules attached to the partition wall plates and the outer periphery of the rotary supply board, high This enables accurate quantitative supply.

Moreover, since the structure is simple, it has the advantage that it can be manufactured at low cost.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the powder/granular material quantitative feeding device of the present invention, and FIG. 2 is a partially cutaway enlarged cross-sectional view showing the main parts thereof. 1: Storage chamber, 2: Division partition plate, 3: Quantitative storage chamber,
4: Rotating quantitative supply board, 5: Pneumatic feed riser pipe,
10: Pressure equalization pipe, 11: Rotary valve, 12:
Supply panel part casing.

Claims (1)

[Scope of utility model registration request] A rotary quantitative supply board 4 has a plurality of partition partition plates 2 radially protruding from the outer periphery at the bottom of a storage chamber 1 that temporarily stores powder and granular materials such as pulverized coal supplied from a hopper etc.
is rotatably provided at a position where a part of the rotation locus of the compartment bulkhead plate 2 protrudes from the chamber wall of the storage chamber, and the protruding portion of the rotary quantitative supply plate from the storage chamber 1 is connected to the outer periphery of the storage chamber 1. The pneumatic feed riser pipe 5 is connected to the openings in the upper and lower walls of the feed plate part casing 12, and the air flow in the pneumatic feed riser pipe is connected to the compartment partition plate 2.
The powder and granule quantitative storage chamber 3, which is sealed between the upper wall, lower wall, side wall of the supply plate part casing 12 and the compartment partition plate 2, is passed through the supply plate part casing so as to cross the rotation locus area of the supply part casing 12. formed inside,
Furthermore, there is a rotary valve 11 in the middle of the powder input path connected to the upper part of the storage chamber 1, which can shut off the powder and air.
A pressure equalizing pipe 10 is provided with a closing means such as the like, and communicates the upper space in the storage chamber 1 with the space inside the pneumatic feed riser pipe 5.
A powder/granular material quantitative feeding device.