JPS6354611B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously mixing and transporting dissimilar substance powders stored in separate pressurized tanks at a desired mixing ratio in a pressurized transport pipe.

(Prior art) Conventionally, when transporting different types of powder and granules, the amounts of different types of powder and granules are charged into a mixer in advance in accordance with the mixing ratio, and after stirring and mixing, the mixed powder and granules are transferred to a pressurized tank. It is common to supply and transport under high pressure. This method requires a mixer in addition to a high-pressure transport device, which increases the size of the entire device.In addition, the mixing ratio in the mixer is determined by the amount of powder and granules input, so the mixing ratio is adjusted during mixing. It is impossible to change the mixing ratio, and it has drawbacks such as the inability to perform high-pressure transportation while controlling the mixing ratio.

In addition, conventionally, when multiple pressurized tanks were installed in parallel and connected to a common transport pipe, mutual interference occurred, making transport impossible, or it was impossible to do so without configuring a complex control system such as decoupling control. It was thought that.

The present invention breaks away from such conventional wisdom and provides a completely new mixing transport device for mixing during pressure transport. The powder and granules from these pressurized tanks are mixed in a common transport pipe via the outlet, and the amount of powder and granules cut out of each pressurized tank is controlled hydrodynamically by a control device for cutting operation. By controlling the mixing ratio to a desired value, high-pressure transportation is possible.

(Structure) The device of the present invention is provided with a plurality of pressurized tanks each having a discharge nozzle that opens above the fluidized bed and each containing a dissimilar substance powder, each of which is connected to a common transport pipe via a transport valve. Also, a booster line equipped with a flow rate regulator is connected between each of the transportation valves and the transportation pipe, and the flow rate regulator is configured to control pressure based on the pressure difference between the respective pressurized tank pressure and the discharge nozzle. It is controlled by

(Embodiment) To explain an embodiment of the apparatus of the present invention with reference to the above drawings, 1A and 1B are pressurized tanks in which different types of powder and granular materials are filled through input valves 2A and 2B, respectively, and the lower part of the tanks are pressurized tanks. Floors 3A and 3B are formed.

5 is a pressurized gas supply source such as air or inert gas; 6
A and 6B are pressurizing lines that supply pressurized gas from the supply source 5 to the fluidized beds 3A and 3B of the pressurizing tanks 1A and 1B, and these pressurizing lines 6A and 6B are equipped with pressure regulating valves 7A and 7B. are interposed, and the pressure regulating valves 7A, 7B are operated by the outputs of pressure regulators 9A, 9B supplied with the detection outputs of pressure detectors 8A, 8B which detect the pressure at the positions of the fluidized beds 3A, 3B. The pressure inside the pressurized tank is controlled at a fixed value to a required value.

One end of 11A and 11B is pressurized tank 1A and 1B.
A discharge nozzle extends into the interior and faces the fluidized beds 3A and 3B, and the other end is connected to the transport pipe via transport valves 12A and 12B, which are operated to be fully closed when not in transport and fully open during transport. It is connected to 13.

15A, 15B are booster lines connected between the pressurized gas supply source 5 and the secondary sides of the transport valves 12A, 12B of the discharge nozzles 11A, 11B, and are connected to the flow rate detectors 16A, 16B and the flow rate adjustment valves 17A,
17B is interposed, and the detection outputs of the flow rate detectors 16A and 16B are supplied to the flow rate regulators 18A and 18B.
17B is operated and the booster gas flow rate is controlled, thereby controlling the amount of powder material cut out through the discharge nozzles 11A and 11B. That is, by increasing the booster gas flow rate, the amount of powder material cut out is decreased, and by decreasing it, the amount of powder material material cut out is increased, and the amount of powder material cut out is controlled hydrodynamically. do.

20A and 20B are differential pressure detectors that detect the pressure loss of the discharge nozzles 11A and 11B, and based on the outputs of these differential pressure detectors, the discharge nozzles 11A and 1
The mass flow rate of the powder passing through 1B is measured.
That is, the pressure loss △P of the discharge nozzle is △P=△Pa+△Ps (1).

However, △Pa is the pressure loss of pressurized gas only.

In addition, △Ps is the pressure loss due to the granular material, which is called the additional pressure loss. When the granular material is at low speed and high concentration, the gas flow rate is Q, and the mass flow rate ratio of the granular material and pressurized gas ( It is known that the solid-gas ratio) is kmQ.

Therefore, △P=△Pa+kmQ...(2) Mass flow rate is the amount of movement of powder and granular material per unit time, and is expressed in [Kg/h].

Since the mass flow rate of powder and granular material W = mQ, W = (△P - △Pa) / K ... (3), and in this equation, the value of pressure loss △Pa can be ignored only for the pressurized gas at the discharge nozzle. Therefore, equation (3) becomes W≒K△P.

In other words, the measured value of the discharge nozzle pressure drop (differential pressure) represents the mass flow rate.

Therefore, by multiplying the outputs of the differential pressure detectors 20A, 20B by a proportionality constant K calculated in advance by the mass flow calculators 21A, 21B, the discharge nozzle 11
The mass flow rate of only the powder passing through A and 11B can be measured, and by controlling the booster flow rate controllers 18A and 18B in cascade based on the output of these calculators, the flow rate of the powder and granule can be adjusted to a desired value. can be reliably controlled.

In the device of the present invention, the reason why the booster flow rate Q and the amount of powder cut out vary in inverse proportion is that when the shipping pressure (tank internal pressure) and arrival pressure are constant, △P
Since is constant, according to equation (3), as △Pa increases, W decreases.

Since there is a relationship △Pa∝Q ² , the mass flow rate W is inversely proportional to the gas flow rate Q.

Next, to explain the operation of the device of the present invention, first, the pressure control valves 7A and 7B of each pressurized tank and the transport valve 12
A, 12B are closed to make the pressure inside the tank normal pressure, and then the input valves 2A, 2B are opened to pressurize tanks 1A, 1.
B is filled with different types of powder and granular materials to be mixed.
Next, the pressure control valves 7A and 7B are opened and the pressure inside the pressurized tank is increased to the required value, and then the transport valves 12A and 12B are opened.
By opening the flow control valves 17A and 17B at the same time, the powder fluidized by the pressurized gas supplied from the pressure lines 6A and 6B is cut out through the discharge nozzles 11A and 11B, and the nozzle confluence point is cut out. are mixed and transported through the transport pipe 13. At this time, the mixing ratio of powder and granules is booster line 15A, 1
The desired value is set by setting the set values of the flow rate controllers 18A and 18B of 5B to a desired value and controlling the amount of powder and granular material cut out from each pressurized tank. When changing the mixing ratio, it is sufficient to change the set values of the flow rate controllers 18A and 18B.

Further, the mass flow rate of the powder passing through the discharge nozzles 11A, 11B is measured by computing units 21A, 21B, and the flow rate regulators 18A, 18B are cascade-controlled by the measured output.

As described above, according to the apparatus of the present invention, the number of pressurized tanks corresponding to the number of powders and granules to be mixed is provided and the amount of the powders and granules cut out is controlled, thereby eliminating the need for a separate mixer. It has the excellent characteristics of being able to mix granules and transport them under high pressure, as well as being able to easily and arbitrarily change the mixing ratio, thereby ensuring reliable mixed transport.

In addition, the pressure loss of the discharge nozzle is detected, the mass flow rate of the powder passing through the discharge nozzle is measured, and the amount of powder cut out is controlled based on the measured value, based on the actual flow rate of the powder. Since the mixing ratio is controlled by using the method, the mixed powder and granular material can be transported at an accurate mixing ratio.

In the above example, the case of mixing two types of powder and granules was explained, but by adding a pressurized tank, it is possible to mix and transport three or more types of powder and granules. It is also possible not only to mix powder or granules and liquid, but also to mix and transport them.

Also, pressurized gas is supplied to each pressurized tank 1A, 1B through a pressure regulating valve 7 common to both, as shown in FIG.
A pressure regulator 9 may also be provided.

Furthermore, instead of controlling the amount of powder cut out by controlling the flow rate of the booster line, as shown in Fig. 3,
The amount of cutout may be controlled by adjusting the pressurized gas supply pressure to the fluidized beds 3A, 3B of each pressurized tank using regulators 9A, 9B.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the device of the present invention;
FIGS. 2 and 3 are system diagrams showing other examples of the apparatus of the present invention, respectively. 1A, 1B are pressurized tanks, 3A, 3B are fluidized beds, 6A, 6B are pressurized lines, 7, 7A, 7B are pressure control valves, 11A, 11B are discharge nozzles, 13
is a transport pipe, 15A, 15B are booster lines, 1
7A and 17B are flow control valves, 20A and 20B are differential pressure detectors, and 21A and 21B are mass flow rate calculators.

Claims (1)

[Claims] 1. The discharge nozzles of a plurality of pressurized tanks each having a discharge nozzle that opens above the fluidized bed and each containing a dissimilar material powder are connected to a common transport pipe via a transport valve, and each of the transport valves and the Booster lines each having a flow rate regulator are connected between the transport pipes, and the flow rate regulators are controlled based on the pressure difference between the respective pressurized tank pressures and the respective discharge nozzles. A high-pressure gas transport device for mixing powder and granular materials, characterized in that the amounts cut out from each pressurized tank are discharged at a required ratio and mixed and transported in the transport pipe.