JPH0131309Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a spouted bed type solid-gas contact device.

The spouted bed type solid-gas contact device takes advantage of its good solid-gas contact properties and is widely used for purposes such as granulation and drying of solid particles, thermal decomposition of gases and liquids, and heat exchange.

When such a spouted bed type solid-gas contact device is used as a heat exchanger, a device having a draft tube for securing a gas flow path inside the shell is conventionally known.

FIG. 1 is a schematic side sectional view of a conventional spouted bed type solid-gas contactor having such a single draft tube, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1.

In Figures 1 and 2, a high-temperature gas inlet nozzle 2 and a gas outlet nozzle 3 are installed at the bottom and top of the shell 1, respectively, and a draft tube 4 extending vertically at the center of the shell 1 is fixed to the top of this tube. An integral body with the particle splash prevention plate 5 is suspended, and this integral body can be moved up and down by an external drive motor 6. The inside of the draft tube 4 forms a particle transport layer 7, and the inside of the shell outside the draft tube forms a particle migration layer 8.

The high temperature gas enters the shell 1 through the gas inlet nozzle 2, mixes with solid particles from the particle transport layer 8 at the lower end of the draft tube 4 located directly above it, and then passes through the particle transport layer 7 in the draft tube 4. The gas is blown up at high speed in a solid-gas mixed phase state, the solid particles are separated by the splash prevention plate 5, and the gas exits from the gas outlet nozzle 3 as it is.

However, in such a conventional device, when the device is enlarged to handle a large amount of gas, the draft tube 4 becomes large in the particle transport layer 7, and the gas passing near the center does not come into contact with solid particles. As a result, the solid-gas contact within the draft tube deteriorates, which tends to cause a decrease in heat exchange performance.Also, in the particle movement layer 8, particles near the peripheral wall do not descend smoothly, so heat transfer tubes are arranged. Problems arise, such as being restricted by location.

The present invention was developed to solve these conventional problems, and aims to improve the poor flow of particles circulating in the system that occurs in a large spouted bed type solid-gas contact device that has a single draft tube. In order to improve the suction of particles at the lower part of the draft tube, it was developed based on the fact that it is necessary to move the draft tube close to the peripheral wall where the particles descend by a large amount.

In other words, the present invention improves solid-gas contact and prevents particles from falling by forming the particle transport layer in an annular structure with narrow gaps and forming particle transfer layers on the inside and outside of this annular structure. It is characterized by eliminating the bad parts of.

A preferred embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 3 is a schematic side sectional view showing an example of the spouted bed type solid-gas contact device according to the present invention, and FIG. 4 is B of FIG. 3.
-B sectional view.

In Figures 3 and 4, a large spouted bed type solid-gas contact device is used as a cooling heat exchanger (spouted bed cooler), and its shell 10 has a hot gas inlet nozzle (gas inlet part) 11 at its lower part. It has a cooling gas outlet nozzle (gas outlet part) 13 in its upper part, and a conical distributor 12 for gas distribution is provided in the gas inlet part 11 of this shell 10. A gas passage annular body 14 made of a concentric double pipe having an appropriate gap is provided inside the shell 1 between the outlet part 13 and the annular body 14.
A particle splash prevention plate 15 is provided at the gas outlet end of the shell 1, and the integral body of the annular body 14 and the particle splash prevention plate 15 is suspended inside the shell 1 and is moved up and down by an external drive motor 16. I'm starting to be able to do it.

Further, the particle transport layer 23 is formed inside and outside the particle transport layer 22 made of the annular body 14, and a heat transfer tube 19 connecting the lower ring header 17 and the upper ring header 18 is disposed in this portion. A cooling medium (for example, water, steam, oil, air, etc.) 20 flows through the medium and is recovered in a high temperature state 21.

Note that the heat exchanger tube 19 is a vertical straight heat exchanger tube,
They are attached to the upper and lower ring headers at appropriate intervals.

Next, its effect will be explained.

The high-temperature gas enters the shell 10 from the inlet nozzle 11, is distributed radially by the distributor 12, and is then blown up in a solid-gas mixture with solid particles inside the annular particle transport layer 22, and is then blown up into the shell 10 by the blow-out prevention plate 1.
At step 5, the solid particles are separated, and the gas is cooled by taking heat from the particles and exits from the system through the cooling gas outlet nozzle 13.

On the other hand, the particles, which have gained heat from the gas and have risen in temperature, gradually descend through the particle movement layer 23, while passing through the lower ring header 1 disposed in that area.
7. Heat is applied to the cooling medium 20 flowing through the heat transfer tube 19 and the upper ring header 18 in this order.

The annular body 14, which serves as a gas passage, can be moved up and down by an externally provided drive motor 16.
By moving the annular body itself up and down in this way, the suction area for particles can be varied and the cooling temperature can be adjusted, and when the operation is stopped, the system is closed to prevent particles from falling into the inlet gas line. Furthermore, when starting operation, the pressure can be gradually raised to minimize pressure fluctuations and allow for a smooth start-up.

As described above, according to the present invention, by forming the particle transport layer, which is a gas passage, into an annular body with a narrow gap, particles are sucked in from both the inside and outside, resulting in solid-gas contact. Increased efficiency and
There is no gas blow-through, the particle suction position is closer to the peripheral wall, and the particle stagnation area near the peripheral wall in the conventional method is eliminated, so cooling efficiency is good even when processing large amounts of gas, and the heat exchanger tube is also closer to the peripheral wall. They can be placed nearby and can be easily scaled up.

[Brief explanation of the drawing]

Fig. 1 is a schematic side sectional view showing a conventional spouted bed type solid-gas contact device, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a schematic side sectional view showing a conventional spouted bed type solid-gas contact device. FIG. 4 is a schematic side sectional view showing an example, and FIG. 4 is a sectional view taken along the line BB in FIG. 3. 10... Shell, 11... High temperature gas inlet nozzle, 12... Distributor, 13... Cooling gas outlet nozzle, 14... Annular body for gas flow path, 1
5... Particle splash prevention plate, 16... Lifting drive motor, 19... Heat exchanger tube, 22... Particle transport layer, 23
...Particle movement layer.

Claims (1)

[Scope of utility model registration request] a shell having a gas inlet and a gas outlet;
a distributor provided at the gas inlet of the shell; a gas flow annular body comprising a double pipe provided inside the shell between the distributor and the gas outlet; 1. A spouted bed type solid-gas contact device comprising a particle splash prevention plate provided at a gas outlet end of the body.