JPS603121B2 - Fluidized bed partition device for fluidized bed equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluidized bed partitioning device that suppresses the discharge rate of unreacted carbon and unreacted desulfurization agent in the fluidized bed of a fluidized bed.

Conventional fluidized bed equipment uses a single-stage fluidized bed with no partitions in the fluidized bed, so the fluidized bed mixes as one layer, causing unburned carbon and The emission rate of unreacted desulfurization agents (limestone, dolomite, etc.) is extremely high, which not only results in low heat conversion efficiency, but also poses a problem of exhaust gas pollution and requires a large-scale unburned carbon combustion furnace, which increases equipment costs. It also had the disadvantage of requiring a large amount of money.

The present invention eliminates the above-mentioned drawbacks of conventional products and provides high-temperature (80
By using low-temperature heat transfer tubes (flowing water or steam) as partitions of a fluidized bed (0 to 900°C),
The purpose of the present invention is to provide a fluidized bed partitioning device for a fluidized bed apparatus that can easily make a fluidized bed effective as a multistage bed, increase heat conversion efficiency, reduce equipment costs, and purify exhaust gas. do.

In short, the present invention provides a fluidized bed apparatus in which six horizontal reed heating tubes having vertical fins are vertically stacked and arranged in the fluidized bed, and particles in the fluidized bed pass between the fins and adjacent fins. The present invention is characterized by a fluidized bed partition of a fluidized bed device with a gap provided therein.

Below, an embodiment of the present invention will be described with reference to the drawings. In FIG. 1, a fluidized bed boiler 1 has the same fluidized beds 2 stacked in several stages to save direct installation floor space. A wind box part 4 is provided through the air box, and the wind box part consists of an air inlet nozzle 5 for supplying combustion air and a dispersion plate 7 having a large number of holes 6.

Further, 8 is a particle inlet nozzle for coal, desulfurization agent, etc., which is inserted diagonally from above to below through the furnace 3 and injects the particles into the fluidized bed 2. . A large number of heat transfer tubes 9 are arranged horizontally in the coal combustion section 10 in a horizontal direction, and absorb heat generated by combustion of coal powder and release the heat to water or steam flowing inside to heat it. It is supposed to be done. These 6 poisonous heat cubes
In the center of the tube 9, six mechanically oriented heat tubes 12 with fins 11 are arranged vertically stacked and at least one row is positioned as a partition, and the fins 11 serve as a partition between the fluidized bed 2. I am accomplishing it. As shown in FIG. 2, two fins 11 are provided in the vertical direction of each heat transfer tube 12 to prevent the movement of particles to some extent, to obtain the multi-stage effect of the fluidized bed 2, and to A gap C is provided between the tube 12 and the fins 11 through which particles can pass, allowing the particles to flow between the finned six-reed heat tubes 12 and preventing carbon and other particles from forming. The discharge rate of unreacted desulfurization agent is set at an appropriate level. 13 is a particle outlet nozzle through which the particles that have finished combustion or reaction are discharged to the outside of the furnace; 14 is a combustion gas outlet nozzle configured so that the combustion gas is discharged from here to the outside of the furnace. ing.

The operation of the fluidized bed partitioning device of the present invention configured as described above will be explained next. When combustion air is sent from the air inlet nozzle 5, the air passes through the small holes 6 of the distribution plate 7 and enters the coal combustion section 10. As a result, fine coal powder and desulfurizing agent particles are ejected from the particle inlet nozzle 8, mix with them and flow violently to form a fluidized bed 2, which is then combusted.

In the figure, the particles try to move from left to right, but the row of finned heat transfer tubes 12 prevents this movement to some extent, and the carbon burns appropriately and the desulfurization agent reaction progresses. , the particles move to the right side of the finned heat transfer tube 12 through the gap C of the fins 11, and again give heat to the heat transfer tubes 9 arranged around it, the coal is sufficiently combusted, and the desulfurization agent is In a state where the reaction has been sufficiently completed, the exhaust gas is discharged from the particle outlet nozzle 13 to the outside of the furnace, and on the other hand, the exhaust gas is sufficiently desulfurized and is sent to the combustion gas outlet nozzle in a pollution-free state! 4 and is discharged from the furnace. By carrying out the present invention, the movement of coal and desulfurizing agent particles is moderately hindered by the partitioning mechanism of the fluidized bed, so if the fluidized bed is multi-staged, the same effect can be obtained, and unreacted carbon and unreacted desulfurization The rate of discharge of the desulfurization agent is reduced, the heat conversion efficiency is improved, the combustion furnace for unburned carbon is made more compact, equipment costs can be reduced, and desulfurization is completely performed, eliminating waste of desulfurization agents. At the same time, it is possible to purify the exhaust gas and make it non-polluting.Furthermore, depending on the number of finned heat transfer tubes to be reinstalled, 2-stage, 3-stage, etc.
Various effects such as making it possible to bring the flow of carbon and desulfurizing agent particles closer to the piston flow can be obtained.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a fluidized bed poiler according to an embodiment of the present invention, and FIG. 2 is an enlarged vertical cross-sectional view of a finned heating tube. 1...Fluidized bed boiler, 2...Fluidized bed, 11
...Fin, 12...Finned heat transfer tube, C...Gap between fins. Figure 2 Figure 1

Claims (1)

[Claims] 1 In a fluidized bed apparatus, horizontal heat transfer tubes having vertical fins are arranged in a vertically stacked manner in a fluidized bed, and fluidized particles in the fluidized bed pass between adjacent fins. A fluidized bed partitioning device for a fluidized bed apparatus, characterized in that a gap is provided to obtain a fluidized bed.