CN218379371U

CN218379371U - Economizer for power station boiler

Info

Publication number: CN218379371U
Application number: CN202222207903.XU
Authority: CN
Inventors: 陈林康; 胥金亮
Original assignee: Jiangsu Zhongrun Energy Equipment Co ltd
Current assignee: Jiangsu Zhongrun Energy Equipment Co ltd
Priority date: 2022-08-22
Filing date: 2022-08-22
Publication date: 2023-01-24
Anticipated expiration: 2032-08-22

Abstract

The utility model discloses a power station boiler economizer, which comprises a cylindrical economizer main body, wherein the economizer main body is provided with a flue gas inlet, the flue gas inlet is arranged away from the center of the cylindrical economizer main body, and an air inlet pipe at the flue gas inlet is arranged in the tangential direction of the excircle of the cylindrical economizer main body; the economizer main body is provided with a flue gas outlet; the economizer main body is provided with a water inlet and a water outlet, a jacketed pipe bundle is arranged in the economizer main body, the jacketed pipe bundle is provided with two ports penetrating through the wall of the economizer main body, and the two ports are respectively communicated with the water inlet and the water outlet. The utility model discloses change the flue gas air current that admits air, the utility model discloses wearing and tearing are little than the tube bank that the staggered arrangement was arranged, and the tube burst probability obtains reducing, and the vibration accident can be avoided again to the tube bank that the non-is arranged in the same direction as the row, fully considers to set up the tube bank behind the respective defect of in-line staggered arrangement, has effectively avoided the problem of tube burst.

Description

Economizer for power station boiler

Technical Field

The utility model relates to a power plant is economizer for boiler.

Background

The Economizer (Econoizer, english name) is a device which is arranged at the lower part of a flue at the tail part of a boiler and used for recovering waste heat of exhausted smoke, water supplied by the boiler is heated into a heating surface of saturated water under the pressure of a steam drum, and the Economizer is called as an Economizer because the Economizer absorbs the heat of high-temperature smoke, reduces the temperature of the exhausted smoke, saves energy and improves the efficiency.

When the economizer is used, pipe explosion is a main reason causing major accidents, the reasons for pipe explosion are many, mainly including abrasion, corrosion and vibration, for example, the abrasion is increased due to high flue gas flow velocity and high flue gas ash content, and different abrasion conditions of pipe bundle arrangement forms and pipe bundle shape structures (for example, the abrasion is smaller in a transverse arrangement than a staggered arrangement) in the economizer are different. In the case of corrosion, which is called low temperature corrosion, the outer tube corrosion is formed by the sulfuric acid vapor in the air adhering to the outer wall of the economizer tube due to the low temperature of the outer surface of the economizer tube. The vibration is caused by self-excited vibration generated between the air flow and the tube, which is generated when the air flow is transversely or forwardly bundled; how to avoid pipe explosion is a key concern for those skilled in the art.

Patent publication No. CN 206430086U: the utility model provides a boiler economizer structure, boiler economizer structure include bypass economizer, subordinate's economizer, the bypass economizer include fin pipe I, the bypass economizer sets up to buckle the structure that forms for I fin pipe that is arranged side by many, every fin pipe I sets up to the reciprocal structure of buckling into the multilayer pipeline and arranging, every layer pipeline of fin pipe I all sets up to the structure that the level was arranged, the water inlet and the boiler intercommunication of fin pipe I. The fly ash abrasion of the flue gas to the economizer is reduced by reducing the flow velocity of the flue gas passing through the economizer, and the problem of pipe explosion leakage of the economizer can be avoided to a certain extent. At present, the problems of abrasion and tube explosion are not solved from the aspect of improving airflow.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the defect that exists among the prior art, provide a power station is economizer for boiler, change the flue gas air current that admits air, the utility model discloses less than the tube bank wearing and tearing that the staggered arrangement was arranged, the tube burst probability obtains reducing, and the vibration accident can be avoided again to the tube bank that the non-in-line was arranged, fully considers to set up the tube bank behind respective defect of in-line staggered arrangement, has effectively avoided the problem of tube burst.

In order to achieve the purpose, the technical scheme of the utility model is to design an economizer for a power station boiler, which comprises a cylindrical economizer main body, wherein a flue gas inlet is arranged on the economizer main body, the flue gas inlet is arranged far away from the center of the cylindrical economizer main body, and an air inlet pipe at the flue gas inlet is arranged in the tangential direction of the excircle of the cylindrical economizer main body; the economizer main body is provided with a flue gas outlet;

the economizer main body is provided with a water inlet and a water outlet, a jacketed pipe bundle is arranged in the economizer main body, the jacketed pipe bundle is provided with two ports penetrating through the wall of the economizer main body, and the two ports are respectively communicated with the water inlet and the water outlet. The two ports of the jacketed pipe bundle are respectively used as the two ports of the tube pass, namely, the two ports are respectively used for water inlet and water outlet, the smoke inlet and the smoke outlet on the wall of the economizer main body are respectively used as the two ports of the shell pass and are respectively used for air inlet and air outlet, heat of smoke is exchanged for water in the tube pass after the smoke is introduced, the smoke is discharged after being cooled, the water outlet temperature is high, the water supply temperature entering a steam drum is increased, and the normal water circulation of the boiler is ensured.

The further technical scheme is that the jacketed pipe bundle comprises a plurality of vertically arranged end-to-end serpentine pipes which are uniformly arranged in the inner cavity of the cylinder of the cylindrical economizer main body. The wear is only relatively small, and the wear of the tube bundles which are not arranged in line is less than that of the tube bundles which are arranged in staggered mode; considering the vibration of the tube bundle again, most vibration accidents occur in the coal economizer with the tube bundle arranged in line, so the coal economizer adopts the vertically arranged coiled tube to match with the spiral air inlet, the tube bundle abrasion is between two forms of arrangement in line and staggered arrangement, and the tube bundle vibration is not as large as that in line, so the tube bundle vibration of the coal economizer is not large, the tube bundle abrasion is also not large, and the problem of tube explosion is effectively avoided.

The other technical scheme is that the jacket type tube bundle comprises a plurality of rows of heat exchange tubes arranged from top to bottom, each row of heat exchange tubes are arranged in a spiral line on the horizontal plane, and the upper and lower adjacent heat exchange tubes are connected through a vertically arranged communicating tube. The communicating pipe of the heat exchange pipes of the first row and the second row is arranged at the center of the cylindrical economizer main body, and the communicating pipe of the heat exchange pipes of the second row and the third row is arranged at the edge of the heat exchange pipes arranged in a spiral line, so that the transverse natural frequency in the economizer is different, the vibration of the pipe bundle can be reduced, and the pipe explosion is avoided. This also avoids self-excited vibration between the gas flow and the tube.

The further technical scheme is that the heat exchange tubes after the fifth row from top to bottom in the jacketed tube bundle are provided with fins. Because the tube bundle behind the fifth row is easier to wear in the tube bundles arranged in line, although the air flow direction of the economizer is spiral air flow, the heat exchange tubes arranged in a spiral way in each row are still similar to the heat exchange tubes arranged in line, so that the wear resistance is increased by arranging the fins on the heat exchange tubes in the fifth row which are easier to wear, and the processing cost is reduced by arranging the fins after the fifth row.

The further technical scheme is that the height of the fins is less than or equal to 3mm. Experiments prove that the fins are smaller in height and less prone to abrasion, and therefore the fins with the small heights are adopted.

The further technical scheme is that the pipe diameter of the heat exchange pipe after the fifth row is larger than the pipe diameters of the heat exchange pipes from the first row to the fourth row. Experiments prove that the larger the pipe diameter of the pipe bundle is, the smaller the abrasion is, and therefore, the pipe diameter is larger for the pipe bundle after the fifth row which is easier to abrade.

The further technical scheme is that an anti-abrasion coating layer is coated on the outer wall of the heat exchange tube. The problem of outer tube corruption can be avoided after setting up like this, avoids corroding also to help avoiding the booster.

The coal economizer comprises an economizer main body, wherein a conical ash falling hopper is arranged below the economizer main body, an ash outlet is formed in the lower end of the ash falling hopper, and supporting legs located on the outer side of the ash falling hopper are fixedly arranged at the lower end of the economizer main body.

The utility model has the advantages and the beneficial effects that: change the flue gas air current that admits air, the utility model discloses the tube bank that arranges than the staggered arrangement wearing and tearing are little, and the tube burst probability obtains reducing, and the tube bank that the non-in-line was arranged can avoid the vibration accident again, fully considers to set up the tube bank behind respective defect arranged in-line staggered arrangement, has effectively avoided the problem of tube burst.

The wear is only relatively small, and the wear of the tube bundles which are not arranged in line is less than that of the tube bundles which are arranged in staggered mode; considering the vibration of the tube bundle again, most vibration accidents occur in the coal economizer with the tube bundle arranged in line, so the coal economizer adopts the vertically arranged coiled tube to match with the spiral air inlet, the tube bundle abrasion is between two forms of arrangement in line and staggered arrangement, and the tube bundle vibration is not as large as that in line, so the tube bundle vibration of the coal economizer is not large, the tube bundle abrasion is also not large, and the problem of tube explosion is effectively avoided.

Because the tube bundle behind the fifth row is easier to wear in the tube bundles arranged in line, although the air flow direction of the economizer is spiral air flow, the heat exchange tubes arranged in a spiral way in each row are still similar to the heat exchange tubes arranged in line, so that the wear resistance is increased by arranging the fins on the heat exchange tubes in the fifth row which are easier to wear, and the processing cost is reduced by arranging the fins after the fifth row.

The mode of adopting the fins with small height is not easy to wear,

the larger the tube bundle diameter, the less wear, so for the tube bundle after the fifth row, which is more susceptible to wear, a larger tube diameter is used.

Drawings

FIG. 1 is a schematic diagram of a first embodiment of the economizer for a utility boiler;

FIG. 2 is a top view of FIG. 1;

fig. 3 is a schematic diagram of a second embodiment of the present invention.

In the figure: 1. an economizer main body; 2. a flue gas inlet; 3. a water inlet; 4. a water outlet; 5. a heat exchange pipe; 6. a communicating pipe; 7. a dust falling hopper; 8. an ash outlet; 9. a support leg; 10. a serpentine tube.

Detailed Description

The following description will further describe embodiments of the present invention with reference to the accompanying drawings and examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

The first embodiment is as follows:

as shown in fig. 1 to 2, the utility model relates to an economizer for a power station boiler, which comprises a cylindrical economizer main body 1, wherein a flue gas inlet 2 is arranged on the economizer main body 1, the flue gas inlet 2 is arranged away from the center of the cylindrical economizer main body 1, and an air inlet pipe at the flue gas inlet 2 is arranged in the tangential direction of the excircle of the cylindrical economizer main body 1; a flue gas outlet 11 is arranged on the economizer main body 1; the economizer main body 1 is provided with a water inlet 3 and a water outlet 4, a jacketed pipe bundle is arranged in the economizer main body 1, the jacketed pipe bundle is provided with two ports penetrating through the wall of the economizer main body 1, and the two ports are respectively communicated with the water inlet 3 and the water outlet 4. The jacketed tube bundle comprises a plurality of rows of heat exchange tubes 5 arranged from top to bottom, each row of heat exchange tubes 5 are arranged in a spiral line on the horizontal plane, and the upper and lower adjacent heat exchange tubes 5 are connected through a communicating tube 6 vertically arranged. In the jacketed tube bundle, the heat exchange tubes 5 in the fifth row from top to bottom are provided with fins. The height of the fins is less than or equal to 3mm. The pipe diameter of the heat exchange after the fifth row is larger than that of the heat exchange pipes 5 from the first row to the fourth row. The outer wall of the heat exchange tube 5 is coated with an anti-abrasion coating layer. A cone-shaped ash falling hopper 7 is arranged below the coal economizer main body 1, an ash outlet 8 is arranged at the lower end of the ash falling hopper 7, and supporting legs 9 positioned on the outer side of the ash falling hopper 7 are fixedly arranged at the lower end of the coal economizer main body 1.

The working principle is as follows:

flue gas enters the inner cavity of the economizer main body 1 from the flue gas inlet 2 and then enters the cylindrical inner cavity of the economizer main body 1 in a spiral mode, and finally is discharged from the flue gas outlet, heat is transferred to cooling water in the tube pass by the flue gas in the whole process, and the cooling water is heated after entering the water inlet and finally is discharged from the water outlet. Because the tube bundle after the fifth row is easier to wear in the tube bundles arranged in line, although the gas flow direction of the economizer is spiral gas flow, the heat exchange tubes arranged in spiral in each row are still similar to the heat exchange tubes arranged in line, so that the wear resistance is increased by arranging the fins on the heat exchange tubes in the fifth row which are easier to wear, and the processing cost is reduced by arranging the fins after the fifth row.

Example two:

the difference from the first embodiment is that, as shown in fig. 3, the jacketed pipe bundle includes a plurality of vertically arranged end-to-end serpentine pipes 10, and the serpentine pipes 10 are uniformly arranged in the cylindrical inner cavity of the cylindrical economizer main body 1.

The working principle is as follows:

flue gas enters the inner cavity of the economizer main body 1 from the flue gas inlet 2 and then enters the cylindrical inner cavity of the economizer main body 1 in a spiral mode, and finally is discharged from the flue gas outlet, heat is transferred to cooling water in the tube pass by the flue gas in the whole process, and the cooling water is heated after entering the water inlet and finally is discharged from the water outlet. The wear is only compared, and the wear of the tube bundles which are not arranged in line is less, but is less than that of the tube bundles which are arranged in staggered way; considering the vibration of the tube bundle again, most vibration accidents occur in the coal economizer with the tube bundle arranged in line, so the coal economizer adopts the vertically arranged coiled tube to match with the spiral air inlet, the tube bundle abrasion is between two forms of arrangement in line and staggered arrangement, and the tube bundle vibration is not as large as that in line, so the tube bundle vibration of the coal economizer is not large, the tube bundle abrasion is also not large, and the problem of tube explosion is effectively avoided.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and embellishments can be made without departing from the technical principle of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention.

Claims

1. The economizer for the power station boiler is characterized by comprising a cylindrical economizer main body, wherein a flue gas inlet is formed in the economizer main body, the flue gas inlet is far away from the center of the cylindrical economizer main body, and an air inlet pipe at the flue gas inlet is arranged in the tangential direction of the outer circle of the cylindrical economizer main body; the economizer main body is provided with a flue gas outlet;

the economizer main body is provided with a water inlet and a water outlet, a jacketed pipe bundle is arranged in the economizer main body, the jacketed pipe bundle is provided with two ports penetrating through the wall of the economizer main body, and the two ports are respectively communicated with the water inlet and the water outlet.

2. The economizer for utility boilers of claim 1 wherein the jacketed tube bundle comprises a plurality of vertically disposed end-to-end serpentine tubes uniformly arranged in the cylindrical inner cavity of the cylindrical economizer body.

3. The economizer for utility boilers of claim 1 wherein the jacketed tube bundle comprises a plurality of rows of heat exchange tubes arranged from top to bottom, each row of heat exchange tubes being arranged in a spiral on its horizontal plane, the vertically adjacent heat exchange tubes being connected by a vertically arranged communicating tube.

4. The economizer for utility boilers of claim 3 wherein in the jacketed tube bundle, fins are provided on the fifth row of heat exchange tubes from top to bottom.

5. The economizer for utility boilers of claim 4 wherein the height of the fins is less than or equal to 3mm.

6. The economizer for utility boilers of claim 5 wherein the tube diameter of the heat exchange after the fifth row is larger than the tube diameter of the heat exchange tubes of the first to fourth rows.

7. The economizer for utility boilers as claimed in claim 6, wherein the outer wall of the heat exchange tube is coated with an anti-wear coating.

8. The economizer for utility boilers of claim 7, characterized in that a cone-shaped ash falling hopper is arranged below the economizer body, an ash outlet is arranged at the lower end of the ash falling hopper, and a support leg positioned outside the ash falling hopper is fixedly arranged at the lower end of the economizer body.