JPH0220571Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is based on a fluidized bed combustion furnace, in which a fluidized material is filled on a grid plate suspended at the bottom of a fluidized bed combustion furnace, a reaction tube is inserted into the fluidized material, and a reaction tube is inserted into the fluidized bed combustion furnace. A pipe burner in which a burner main body connected to a fuel supply equipment and a blower is inserted into the fluidized bed combustion furnace by penetrating the intermediate side wall between the grid plate of the combustion furnace and the lower end of the reaction tube. Regarding improvements.

Prior Art FIG. 3 shows a conceptual diagram of a conventional pipe burner. In this pipe burner, particles of a certain particle size (referred to as fluidized material 12) are fed into a vertical column-shaped fluidized bed combustion furnace.
A fixed amount of the fluidized material 12 is charged and stored in the fluidized material 12, and a reaction tube 13 through which a medium to be heated is flowing is inserted into the fluidized material 12. Combustion air and fuel are then sent from the blower 14 and the fuel supply equipment 15 to the burner body 31 for combustion. On the other hand, the air from the blower 14 passing through the air pipe 19 and the exhaust gas sent from the exhaust gas generating furnace 16 are sent to the plenum chamber 17, the temperature is adjusted to below the heat resistance level, and the air is blown out into the fluidized bed 11 through the grid plate 18 and becomes fluid. The material 12 is fluidized and the fuel is heated to a temperature higher than the ignition temperature.

As shown in FIGS. 4 and 5, this burner body 31 consists of a fuel supply pipe 41 and a combustion air supply pipe 42 arranged around the fuel supply pipe 41, each of which has a fuel supply equipment 15 and a blower shown in FIG. Fuel and air sent from the fluidized bed combustion furnace 14 are injected, dispersed and ejected at high speed from a plurality of sets of fuel nozzles 4a and combustion air nozzles 4b, and mixed in the fluidized bed combustion furnace 11.

In this case, the exhaust gas from the exhaust gas generating furnace 16 is sent to the plenum chamber 17 in advance, and the inside of the fluidized bed combustion furnace 11 is heated above the ignition temperature of the fuel (after this heating, the plenum chamber 17
), the supply of exhaust gas to the burner body 3 is stopped.
When fuel and air are injected into the combustion furnace 11 from each fuel nozzle 4a and air nozzle 4b, ignition combustion begins immediately. In the combustion furnace 11, the fluidized material 12 functions as a stabilizer (flame stabilizer) to achieve stable combustion and fluidization. Thereafter, the amounts of fuel and air supplied to the burner body 31 are adjusted to maintain stable combustion and increase the temperature inside the fluidized bed.

When the fluidized material 12 is stored in this way, when gas is ventilated from below the grid plate 18 and its flow rate is increased, the flow velocity between the particles gradually increases, the particles are blown up, and the air flow between the particles increases. The space becomes larger, and the particles that were blown up will fall back down.

Furthermore, when the aeration rate is increased, the vertical movement of the particles becomes more intense, producing a large number of bubbles, and around the bubbles a fluidized bed is formed in which the particles flow down to fill the traces of the bubbles.

This fluidized bed has a uniform internal temperature and a high heat transfer coefficient, so by inserting reaction tubes 13 such as various heat exchangers into this fluidized bed, there is no local thermal damage and uniform heating is achieved. Moreover, it is effective for good heat transfer.

Problems to be Solved by the Invention However, as shown in FIGS. 4 and 5, the burner main body 31 is composed of an air supply pipe 42 and a fuel supply pipe 41 that overlaps with the axes aligned inside the air supply pipe 42, The base ends of both supply pipes 41 and 42 are bent horizontally, and the distal ends thereof are bent vertically, and the vertical parts are bent upward so that the vertical parts are located below the reaction tube 13 in the fluidized bed combustion furnace 11. A blind plate 40 is provided at the upper end of the vertical part for closing and shielding both supply pipes 41 and 42,
A pipe having a structure in which an air nozzle 4b communicating with the air supply pipe 42 and a fuel nozzle 4a communicating with the fuel supply pipe 41 are inserted below the blind plate 40 with their axes aligned inside the air nozzle 4b. In a burner, it is difficult to accurately align the axes of the fuel nozzle 4a and air nozzle 4b, which inevitably results in misalignment of the axes during assembly, resulting in unbalanced air jet speeds in each direction, and combustion. unevenness occurs.

The present invention was devised in order to solve the problems of the conventional technology, and it is possible to accurately align the axes of the combustion nozzle and the air nozzle, and to easily assemble the combustion nozzle and the air nozzle. The purpose of the present invention is to provide a new pipe burner that does not cause uneven combustion in any direction.

Means for Solving the Problems In order to achieve this objective, in the pipe burner of the present invention, a fluidized material is filled on a grid plate suspended over the lower part of a fluidized bed combustion furnace, and a reaction tube is placed inside the fluidized material. A burner body, which is connected to a fuel supply equipment and a blower, is inserted into the fluidized bed combustion furnace by penetrating the intermediate side wall between the grid plate and the lower end of the reaction tube of the fluidized bed combustion furnace. In the pipe burner, the burner body is composed of an air supply pipe and a fuel supply pipe that overlaps with the axes of the air supply pipe, and the proximal ends of both supply pipes are horizontal, and the tips thereof are horizontal. The side is bent into a vertical part, and the vertical part is arranged upward so that it is located below the reaction tube in the fluidized bed combustion furnace, and both air supply pipes are closed and closed at the upper end of the vertical part. A blind plate is provided, and a plurality of integrated fuel/air nozzles are disposed below the blind plate, made of the same material, having a common nozzle port, and communicating with the fuel supply pipe and the air supply pipe. .

Embodiments The present invention will now be described in detail with reference to illustrative embodiments. Note that the same reference numerals are used for components common to the conventional one.

In FIG. 1, 31 is a burner main body, which is composed of an air supply pipe 42 and a fuel supply pipe 41 superposed therein with their axes substantially aligned. The base end sides of both supply pipes 41 and 42 are bent into a horizontal part 31a, and the tip ends are bent into a vertical part 31b, and the vertical part 31b is located below the reaction tube 13 in the fluidized bed combustion furnace 11. The structure is similar to the conventional pipe burner shown in FIGS. 3 and 4 in that it is disposed upward.

At the upper end of the vertical portion 31b, both the supply pipes 41,
A blind plate 40 is provided to close and block 42 (FIG. 1).

Below the blind plate 40, as shown in FIG.
A fuel-air integrated nozzle 5 is provided. That is, the nozzle 5 has a communication hole 5a in its center that communicates with the fuel supply pipe 41, and a nozzle 50 of the communication hole 5a.
A plurality of communication holes 5b communicating with the air supply pipe 42 are diagonally intersecting and merging on the side. In other words, the nozzle 5 is made of the same material, has a common nozzle 50, has communication passages 5a and 5b communicating with the fuel supply pipe 41 and the air supply pipe 42, and has a machinable structure.

The communication hole 5b communicating with the air supply pipe 42 has a hole diameter and number of holes selected as appropriate as shown in FIG. 2 in order to have a cross-sectional area equivalent to that of the conventional air nozzle 4b (FIGS. 4 and 5). be done.

The fuel-air integrated nozzle 5 is connected to the burner body 31.
A plurality of them are arranged at different phases in the circumferential direction on the vertical portion 31b below the blind plate 40.

Function: When fuel and air are supplied from the fuel supply equipment 15 and the blower 14 to the burner body 31, while the fuel passes through the fuel supply pipe 41 from the communication hole 5a of the nozzle 5 to the jet port 50, It joins and mixes with air ejected from the communication hole 5b of the nozzle 5 through the air supply pipe 42, and is dispersed and ejected into the fluidized bed combustion furnace 11 from the nozzle 50.

Effects of the Invention As described above, in the pipe burner of the present invention, a fluidized material is filled on a grid plate that can be spanned at the bottom of a fluidized bed combustion furnace, a reaction tube is inserted into the fluidized material, and the fluidized bed A pipe burner in which a burner body is inserted into the fluidized bed combustion furnace and is connected to a fuel supply equipment and a blower through a side wall intermediate between the lattice plate and the lower end of the reaction tube of the combustion furnace, The burner body is composed of an air supply pipe and a fuel supply pipe that overlaps with the axes thereof substantially aligned within the air supply pipe, and the base ends of both supply pipes are bent into a horizontal part and the distal ends thereof are bent into a vertical part. , and is arranged upward so that its vertical part is located below the reaction tube in the fluidized bed combustion furnace, and a blind plate is provided at the upper end of the vertical part to close off both supply pipes, and the blind plate Since a plurality of integrated fuel/air nozzles made of the same material, having a common nozzle port and communicating with the fuel supply pipe and the air supply pipe are arranged below, this pipe burner can be machined into accurate dimensions and shapes. This eliminates the unbalance of the air ejection velocity and therefore solves uneven combustion.

[Brief explanation of the drawing]

Fig. 1 is an enlarged sectional view of the main part of the pipe burner of the present invention, Fig. 2 is a sectional view taken along the line - - of Fig. 1, Fig. 3 is a schematic diagram of the same pipe burner, and Fig. 4 is the main part of the conventional pipe burner. FIG. 5 is an enlarged cross-sectional view of FIG. 4 taken along the - line. 11... Fluidized bed combustion furnace, 12... Fluidized material, 13
... Reaction tube, 14 ... Blower, 15 ... Fuel supply equipment, 18 ... Grid plate, 31 ... Burner body, 4
0...Blind plate, 41...Fuel supply pipe, 42...Air supply pipe, 31a, 41a, 42a...Horizontal part, 3
1b, 41b, 42b...Vertical part, 5...Nozzle, 5a, 5b...Communication hole, 50...Nozzle.

Claims (1)

[Scope of utility model registration request] A fluidized material is filled on a lattice plate that spans the lower part of the fluidized bed combustion furnace, a reaction tube is inserted into the fluidized material, and a side wall is formed between the lattice plate and the lower end of the reaction tube of the fluidized bed combustion furnace. In a pipe burner in which a burner body is inserted into the fluidized bed combustion furnace and is connected to a fuel supply equipment and a blower through a The base ends of both supply pipes are bent horizontally and the distal ends thereof are bent vertically, and the vertical parts are connected to the reaction tube in the fluidized bed combustion furnace. A blind plate is provided at the upper end of the vertical part of the fuel supply pipe to close and block both supply pipes, and below the blind plate, the fuel supply pipe is made of the same material and has a common nozzle port. and a pipe burner, characterized in that a plurality of fuel-air integrated nozzles communicating with an air supply pipe are arranged.