JPH0740558Y2 - Airport cleaner for soda recovery boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a cleaner suitable for an air port of a soda recovery boiler used in a paper mill, especially for a large air port.

[Conventional technology]

In a paper mill, black liquor is burned in a soda recovery boiler in order to utilize heat generated when recovering chemicals from pulp effluent (usually called black liquor and hereinafter referred to as black liquor).

FIG. 6 shows an outline of the soda recovery boiler, in which the black liquor gun 2 provided in the furnace wall 1 sprays black liquor into the furnace. The sprayed black liquor evaporates due to combustion heat, and the solid content drops at the bottom of the furnace. A large number of primary air ports 3 are provided on the bottom of the furnace, and the air introduced therein burns the solid matter that has fallen to the bottom of the furnace. Then, the chemical liquid (smelt) obtained by combustion descends along the furnace wall and is discharged from the smelt spout 4 to the outside of the furnace to be collected.

Air is introduced into the furnace from the secondary air port 5 in order to keep the solid matter that has dropped on the furnace bottom in a shape that facilitates combustion. In addition, since the incompletely burned gas accompanied by odor exists in the gas generated by the black liquor combustion, a tertiary air port 6 is provided above the black liquor gun 2 to completely burn the gas by the tertiary air port introduced from here. I try to remove the odor.

In each of the above-mentioned air ports 3, 5, and 6, the smelt is cooled by air and hardened, and adheres to the air port to grow. For this reason, a cleaner (cleaning device) is used in order to prevent the air port from being blocked due to hardening and growth of smelt.

The following are such cleaners.

(1) When the nozzle size is small, such as the primary air port, the upper and lower two cleaning rods 11 are moved by the reciprocating operation of the air cylinder 12, as shown in FIG.
Remove 10 deposits. Roller 13 as a fulcrum of the cleaning rod 11
When the cleaning rod 11 moves toward the air port nozzle 10, it rolls on the upper surface of the wind box casing 14 and rides on the guide portion 16, thereby moving the tip of the cleaning rod 11 up and down, and by the tip of the cleaning rod, the required port area is To clean.

(2) When the port size is relatively large, such as the secondary air port, as shown in FIG. 8, a guide rail 14 is provided in place of the guide portion of the wind box casing, and a cleaning rod is provided.
Four round rods 11a are attached to the tip of 11, and the air port is cleaned by the reciprocating movement of the round rods 11a and the associated vertical movement of the rollers 13 riding on the guide rails 14.

The basic operating mechanism in this case is (1) above.
It is similar to the case of.

[Problems to be solved by the device]

Like the cleaners described in (1) and (2) above, when cleaning the air port with a single cleaning rod, sufficient cleaning is possible if the air port nozzle is relatively small. When a large air port (air injection port) is provided like a boiler, the upper part of the air port nozzle cannot be cleaned for the following reason.

In the case of a small air port nozzle, since the vertical movement is small, the cleaning rod moves up and down while moving in the furnace direction.However, when the cleaner cleaning rod moves in the large air port nozzle in the furnace direction, The amount of movement in the furnace is almost absorbed by the vertical movement, and the smelt that adheres to the upper portion of the air port nozzle in the shape of an ice column is pressed against the upper surface.

Therefore, if the large-sized air port nozzle is cleaned by the existing apparatus, the vertical movement of the rod causes the smelt to be pressed against the upper part of the air port nozzle, resulting in the growth of the adhered smelt.

This problem increases the stroke of the air cylinder,
If the moving amount of the rod is increased, the large-sized air port nozzle can be moved in the same manner as in the case of the small-sized air port nozzle, but the stroke cannot be increased due to the restriction of the air duct size.

The present invention is intended to solve the problems of the conventional air port cleaner for the soda recovery boiler.

[Means for Solving the Problems]

The present invention relates to an air port cleaner equipped with a cleaning rod that advances and retreats in the air port of a soda recovery boiler that burns pulp effluent. A cleaning bar for the lower stage is provided that performs both vertical and vertical movements.

[Action]

In the present invention, the upper portion of the air port, which is likely to be clogged by smelt that grows in the shape of an ice column, is effectively cleaned by the cleaning rod for the upper stage that moves straight toward the inside of the furnace. On the other hand, the smelt on the side surface and the lower portion of the air port is cleaned by a lower-stage cleaning rod that moves vertically and vertically toward the inside of the furnace.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS.

Reference numeral 58 is an air cylinder, and a connecting member 62 is attached to the rod of the air cylinder 58. The upper-stage cleaning rod 51 is composed of a connecting rod 51a, a connecting portion 51b, square rods 54a, 54b, and a cleaning plate 53, which will be described later, and a lower-stage cleaning rod 52.
Is composed of a connecting rod 52a, a connecting portion 52b, square rods 56a and 56b, and a cleaning plate 55 which will be described later. Connecting member
Rear ends of a pair of upper and lower connecting rods 51a and 52a are pivotally attached to both ends of the upper and lower connecting rods 62a and 62b, respectively.
Each connecting rod 51a, 52a extends toward the furnace wall 1 and into an air duct 70 provided in contact with the furnace wall 1. The front end of the connecting rod 51a is attached to a connecting portion 51b including a roller 51c that rolls on the upper surface of a horizontal guide rail 60 in the duct 70.
Further, the front end of the connecting rod 52a is a guide portion in the duct 70, the rear portion of which is horizontal and the front portion is obliquely inclined upward.
It is attached to a connecting portion 52b having a roller 52c that rolls on the upper surface of a guide rail 61 having 61a. As shown in FIG. 3, the connecting portion 51b is provided with one upper square bar 54a and two rear lower ends of the square bar 54b which are enlarged toward the front, and these square bars 54a, 54b are attached. A pair of cleaning plates 53,5 with the upper part shrinking and the lower part expanding on both sides of the tip of the
3 is attached, and the cleaning plates 53, 53 can move above the air port nozzle 50 provided on the furnace wall 1 of the soda recovery boiler. Also, the fourth
As shown in the figure, the connecting portion 52b is attached with the rear ends of the upper two square rods 56a and the lower one square rod 56b which are enlarged as they go forward, and the tips of these square rods 56a, 56b are attached. A pair of cleaning plates 55, 55 are attached to both sides of the. These cleaning plates 55, 55 are composed of a vertical portion 55b facing upward and downward, a slope portion 55c approaching each other below, and a cut line 55a at the boundary between these portions, and the air port nozzle 50 below the cleaning plate 53. You can move inside. Further, the interval between the vertical portions 55b, 55b is substantially equal to the interval between the air port nozzles 50 so that the air port nozzles 50 can move forward and backward. Incidentally, 63 is a diaphragm for sealing the connecting rods 51a, 52a.

As shown in FIG. 5, smelt 27 adheres to the furnace wall 1 of the soda recovery boiler and the peripheral wall of the air port nozzle 50, but the smelt melts downward in an ice column shape at the opening of the furnace wall 1 and the upper part of the air port nozzle 50. Grow towards.

In this embodiment, as the air cylinder 58 operates, the upper stage cleaning rod 51 and the lower stage cleaning rod 52 move toward the inside of the furnace via the connecting member 62. At this time, the upper-stage cleaning rod 51 makes a horizontal motion toward the inside of the furnace by the roller 51c rolling on the guide rail 60. On the other hand, the lower-stage cleaning rod 52 makes a horizontal movement toward the inside of the furnace by the roller 52c rolling on the horizontal portion of the guide rail 61, and then the roller 52c moves to the guide portion 61a. By climbing up, a movement to move upward is performed.

Cleaning plate 53 and square bars 54a, 54 of the upper cleaning bar 51
By moving straight in the horizontal direction toward the inside of the furnace as described above, b effectively cleans the ice column-shaped smelt formed in the upper part of the opening of the air port nozzle 50 and the furnace wall 1. On the other hand, the cleaning plate 55 and the square rods 56a and 56b of the lower stage cleaning rod move horizontally and then upward to clean the smelt formed on the lower portion and the side surface of the air port nozzle 50.

As described above, in this embodiment, the upper part of the air port nozzle 50, which is easily clogged, is cleaned by the upper cleaning rod 51 which goes straight toward the inside of the furnace, and the lower part and the side surface of the air port nozzle 50 go straight toward the inside of the furnace and are moved upward. By cleaning with the lower cleaning rod 52 which moves to, it is possible to effectively clean the entire surface of the airport nozzle 50 and remove the smelt.

In addition, the lower cleaning rod 52 may be
As shown in the figure, the cleaning range L ₁
It is configured to clean a wrapping range L ₂ .

Further, in the present embodiment, as shown in FIG. 1, by arranging the upper stage cleaning rod 51 and the lower stage cleaning rod 52 which are symmetrically paired on both sides of the air cylinder 58, a balanced action is achieved. Can be done.

[Effect of device]

The present invention efficiently cleans the smelt on the upper portion of the air port formed in an ice column by the cleaning rod for the upper stage which moves straight, and cleans the smelt on the lower portion and the side of the air port by the cleaning rod for the lower stage which performs straight movement and vertical movement. It is possible to remove the smelt by cleaning the entire surface of a large air port due to the increase in size of the soda recovery boiler.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a front view of the same embodiment, FIG. 3 (a) is a side view of an upper stage cleaning rod of the same embodiment, and FIG. 3 (b). Is a front view thereof, FIG. 4 (a) is a side view of the lower cleaning rod of the same embodiment, FIG. 4 (b) is a front view thereof, and FIG. 5 (a) is a smelt generation state of the air port nozzle portion. FIG. 5 (b) is a side view, FIG.
FIG. 7 is a schematic view of a soda recovery boiler, FIG. 7 (a) is a front view of an example of a conventional air port cleaner, FIG. 7 (b) is a view taken along arrow aa of FIG. 7 (a), and FIG. FIG. 8A is a front view of another example of the conventional air port cleaner, and FIG. 8B is a view taken along the line bb of FIG. 8A. 1 ... Furnace wall, 58 ... Air cylinder, 51 ... Upper stage cleaning rod, 52 ... Lower stage cleaning rod, 51a, 52a ... Connecting rod, 51c, 52c
...... Roller, 54a, 54b, 56a, 56b …… Square bar, 53,55 …… Cleaning plate, 62 …… Coupling member, 60,61 …… Guide rail.

Claims (1)

[Scope of utility model registration request] 1. An air port cleaner having a cleaning rod that advances and retreats in an air port of a soda recovery boiler that burns pulp effluent. An air port cleaner for a soda recovery boiler, which is equipped with a lower-stage cleaning rod that performs both vertical and vertical movements.