KR20070025272A - Water-cooled cyclone for circulating fluidized bed boilers - Google Patents

Abstract

A water-cooled cyclone for a circulation fluid boiler is provided to connect two tubes with a single tube at an arbitrary position of a cyclone hopper to simplify a structure of the tube and readily perform maintenance. A water-cooled cyclone for a circulation fluid boiler includes an outer cylindrical tube, an inner cylindrical tube, a ceiling part, and a hopper part. The outer cylindrical tube has a gas introduction port formed at its side surface. The inner cylindrical tube has an air discharge port formed at an upper part thereof. The ceiling part extends to an upper end of the outer cylindrical tube and side surfaces of the inner cylindrical tube in a concentric manner to close the outer cylindrical tube and the inner cylindrical tube. The hopper part is disposed at a lower part of the outer cylindrical tube and has a cone shape having a circumference and a diameter, which gradually shortened. The outer cylindrical tube has a wall connected to a pin to make a plurality of tubes align parallel to each other. The outer cylindrical tube has a tube and a pin extending to the hopper part.

Description

Water-cooled cyclone for circulating fluidized bed boilers

1 is an exemplary view showing a configuration according to the present invention

FIG. 2 is a detailed view of part A of FIG. 1

3 is an exemplary cross-sectional view taken along the line A-A of FIG.

4 is a cross-sectional view taken along line B-B of FIG.

Figure 5 is an exemplary view showing the overall configuration of the cyclone according to the present invention

6 is a schematic view showing a water circulation system using the present invention

7 is a schematic view showing the configuration of a conventional water-cooled cyclone

* Explanation of symbols for main parts of the drawings

(10): outer cylinder (11): gas introduction part

(20): inner cylinder (21): gas outlet

(30): Heavenly Government (40): Hopper Division

50: tube 60: pin

(70): bifurcator (80): lower ring header

(90): upper ring header

The present invention relates to a water-cooled cyclone for a circulating fluidized bed boiler, in which a tube installed in the hopper portion of a cyclone whose circumference and diameter gradually decreases is connected by a viperator to easily install the entire cyclone wall as a water-cooled heat transfer tube. A water-cooled cyclone for fluid bed boilers.

The circulating induction boiler has a wide acceptance range for fuel, easy to desulfurize and dehalogen in the furnace, easy to control the temperature in the furnace, and combustion at a relatively low temperature, resulting in a small nitrogen product and a good mixing effect of the fuel in the furnace. It is widely applied because of its outstanding properties and its advantages that can be mixed with other fuels.

Such a circulating fluidized bed boiler is a non-mechanical device such as a combustion furnace in which layered material flows and burns, a cyclone for collecting scattered particles, a loop seal for returning collected particles to the combustion furnace, and a J valve. It consists of a circulation device.

The combustion furnace consists of a plurality of tubes, the heat generated in the furnace is recovered as water or steam circulated through the tube, the recovered steam is a natural water through a drum separating the water from the steam It is connected to a circulation circuit and is configured to face the turbine or to the steam reactor to generate electricity.

The circulating fluidized bed boiler made in this way had a problem that the temperature of the cyclone portion was higher than the normal temperature range due to post combustion at high load, and to solve this problem, the conventional cyclone was able to operate the outer casing at a relatively low temperature. For this purpose, an outer fireproof wall having a single structure having corrosion resistance and thermal insulation was used. However, in order to maintain the target thermal insulation, the layer must be relatively thick, which causes a problem that the volume, weight, and cost of the cyclone become large.

In addition, in order to solve the problems caused by the use of such refractory, a cyclone having a wall composed of heat transfer tubes has been developed to increase the thermal efficiency of the boiler. Such a water-cooled cyclone is configured such that a plurality of tubes of constant diameter are connected to each other by fins, that is, each fin is extended from the tube and welded to an adjacent tube to form a gastight-tight wall. The cyclone has a conical hopper connected to the lower portion of the outer cylinder, and has a shape in which the circumference and diameter thereof gradually decrease from the upper end to the lower end.

As described above, the water-cooled cyclone consisting of a tube and a fin gradually reduces the circumference of the hopper while maintaining the diameter of the tube. Therefore, the width of the fin connecting the tube gradually decreases from the top to the bottom so that the circumference can be reduced. If the circumference is further reduced and the tubes are in direct contact with each other, the width of the pins connecting the tubes can no longer be reduced. Therefore, there is a problem that it is very difficult to install the tubes in the entire hopper.

In order to solve this problem, various studies have been actively conducted such as installing an intermediate ring header between the outer cylinder and the hopper, protruding or swaging deformation of a part of the tube installed in the hopper, or expanding the tube.

FIG. 7 illustrates a conceptual diagram of a water-cooled cyclone of US Pat. No. 522606. US Pat. No. 522606 is modified to expand or swipe the tube. The cyclone becomes very complicated in structure and design and manufacture. Difficult, there was a problem that a difficulty in maintenance.

In addition, when installing the intermediate ring header, while reducing the number of tubes extending between the intermediate ring header and the lower ring header, the tube can extend over the entire length of the hopper, there was a problem that the unit cost increases.

The present invention is to solve the above problems, the object is to simplify the tube structure in the cyclone hopper by connecting two tubes to one tube by viper capper at any point of the cyclone hopper portion In addition, the present invention provides a water-cooled cyclone for a circulating fluidized bed boiler that can facilitate maintenance.

According to the present invention, an outer cylinder 10 having a gas inlet 11 on a side surface, an inner cylinder 20 provided with a gas outlet thereon, and a space inside the outer cylinder 10 and the inner cylinder 20 are sealed. Hopper of conical (funnel) type which is located at the lower end of the outer cylinder and the circumference and diameter of the ceiling portion 30 extending concentrically to the upper end of the outer cylinder 10 and the side of the inner cylinder 20 as possible A cyclone having a portion (40); The outer cylinder 10 has a wall integrally connected by the pin 60 so that a plurality of tubes 50 having the same diameter are parallel, the tube and the pin of the outer cylinder to the hopper portion 40 The plurality of tubes 50 extending in the hopper portion 40 are connected to one tube by the viperator 70.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is an exemplary view showing a configuration according to the present invention, FIG. 2 is a detailed view of the portion A of FIG. 1, FIG. 3 is an AA cross-sectional view of FIG. 1, FIG. 4 is a BB cross-sectional view of FIG. 1. 5 is an exemplary view showing the entire cyclone according to the present invention, Figure 6 is a schematic view showing a water circulation system using the present invention, the water-cooled cyclone according to the present invention is a gas diagram on the outer cylinder (10) side The inlet 11 is installed, the gas outlet 21 is installed on the upper portion of the inner cylinder 20, the upper end of the outer cylinder and the inner cylinder so that the space in the outer cylinder 10 and the inner cylinder 20 is sealed The ceiling 30 is concentrically extended to the side, and the conical hopper portion 40 is formed to reduce the circumference and diameter in the lower portion of the outer cylinder, the outer cylinder, the ceiling, the hopper, the gas inlet ( 11) All the tubes 50 are made up of.

In addition, the outer cylinder 10 has a plurality of tubes extending in parallel is formed integrally by the pin, the tube and the pin is bent from the lower end of the outer cylinder conical hopper portion 40 is reduced in the circumference and diameter Extends to configure and connects the two tubes into one tube using the viperator 70 from any one point of the hopper portion 40 so that the tube from the outer cylinder 10 to the hopper portion 40. It is intended to extend integrally.

The ceiling 30 is coupled to the inner cylinder 20 by a conventional technique, such as welding, and the like, and the combination of the ceiling and the inner cylinder is a known technique, detailed description thereof will be omitted.

The inner cylinder 20 is arranged in a coaxial relationship with the outer cylinder 10, the lower portion of the inner cylinder 20 extends into the outer cylinder 10, the upper portion of the inner cylinder 20 is the outer cylinder 10 Extends higher than the upper end of the.

The outer cylinder 10 is composed of a plurality of tubes 50 having the same diameter, and a pin 60 connecting the plurality of tubes. That is, a plurality of tubes are positioned to maintain equal spacing and parallel to each other, and one side of the fins extending from the one tube is welded to another neighboring tube to form a gas-tight gas tight wall. At this time, the width of the pin is always constant in the outer cylinder except for the gas inlet (11).

The hopper portion 40 has a conical shape that decreases in diameter and circumference toward the lower ring header 80, the tube and the pin of the outer cylinder 10 is extended, the hopper tube is reduced in circumference and diameter The smaller the spacing between the tubes, the smaller the fin width.

That is, the outer diameter and the diameter of the hopper portion 40 decreases toward the lower direction as a whole, but since the tube extending to the hopper portion has the same diameter, when the tube reaches any point of the hopper portion, the neighboring tube Are in direct contact with each other so that the tubes can no longer be extended. In the present invention, the vibrator 70 is installed on one side of the hopper portion in which the tubes directly contact each other, and the two tubes are connected to one tube, thereby extending the tube to the bottom.

The viperator 70 is installed to be connected to the tube of the hopper, and has a first and second connection tubes 71 and 72 connected to two tubes at the top and a third connection connected to one tube at the bottom. A tube 73 is provided. That is, the tube of the hopper portion by the viperator is connected to one tube of two tubes at any point of the hopper portion, the number of tubes extending is reduced to ½.

The viper 70 may also be arbitrarily set in the diameter and cross-sectional area of the first, second and third connecting tubes 71, 72 and 73 of the viper, but the circulation of pressure and water (or steam) In consideration of this, as shown in FIG. 3, both sides of the first and second connecting tubes 71 and 72 are symmetrical with respect to the reference line C, and the diameter and cross-sectional area of the first and second connecting tubes 71 and 72 extend from the outer cylinder to the hopper. It is preferable that the diameter and the cross-sectional area of the third connection tube 73 are the same as the sum of the cross-sectional areas of the first and second connection tubes. That is, the plurality of tubes 50 located above and the plurality of tubes 50` positioned below the viperator have different diameters.

The tube has a lower end connected to the lower ring header, an upper end connected to the upper ring header, and is installed over the entire length of the cyclone. That is, the tube forms the entire length of the cyclone.

As described above, in the present invention, when the distance between the hopper portion tube narrows to the point to connect the viper, the two tubes are connected to the first and second connection tubes of the viper capper, and the third of the viper capper One tube is connected to the connecting tube, and one tube connected to the third connecting tube extends the entire length of the hopper portion, bent radially outward, and then bent downward to the inside of the lower ring header. Connection of the tube and the lower ring header is the same as the conventional connection method, a detailed description thereof will be omitted.

In the present invention configured as described above, the lower ring header is disposed at the lower end of the hopper portion, the upper ring header is disposed at the top of the ceiling, and is applied to forced circulation using natural circulation or a pump.

The present invention is not limited to the above-described specific preferred embodiments, and various modifications can be made by those skilled in the art without departing from the gist of the present invention as claimed in the claims. Of course, such changes will fall within the scope of the claims.

As described above, the present invention can form a tube structure having a concise and compact structure without deforming a part of the tube even if the circumference and diameter of the hopper portion are reduced, such as extracting and swaging.

In addition, since the entire length of the cyclone is made of tubes, there is less need for expansion joints and high temperature refractory lining duct work between the combustion furnace and the cyclone, between the cyclone and the heat recovery portion, thereby reducing the amount of refractory usage and maintenance costs. .

In addition, since the wall of the cyclone is made of a heat transfer tube, it is possible to minimize heat loss, increase the thermal efficiency, and significantly reduce the temperature of the outer wall of the cyclone, thereby eliminating the risk of burns due to worker contact. There are many effects.

Claims (3)

An outer cylinder having a gas inlet at the side, an inner cylinder having a gas outlet at the top, and concentrically extending at the upper end of the outer cylinder and the side of the inner cylinder to seal the space in the outer cylinder and the inner cylinder; A cyclone having a ceiling portion and a conical hopper portion located at a lower portion of the outer cylinder and having a reduced circumference and a diameter; The outer cylinder has a wall integrally connected by a pin so that a plurality of tubes having the same diameter is parallel, The tube and the pin of the outer cylinder is extended to the hopper portion, The plurality of tubes extending to the hopper portion is a water-cooled cyclone for a circulating fluidized bed boiler, characterized in that the two tubes are connected to each one tube by viperator. The method of claim 1; The viperator has a first and second connection tubes connected to the hopper section tube at the top, and a third connection tube connected to one hopper section tube at the bottom, the water-cooled cyclone for the circulating fluidized bed boiler . The method of claim 2; The viper has a structure in which both sides are symmetrical with each other, the diameter and cross-sectional area of the first and second connection tubes are the same as the diameter and cross-sectional area of the tube extending from the outer cylinder to the hopper, and the third connecting tube has a diameter and The cross-sectional area is a water-cooled cyclone for a circulating fluidized bed boiler, characterized in that configured to equal the sum of the cross-sectional areas of the first and second connection tubes.

Images