Direct air cooler

Abstract

The direct air cooler comprises a steam distribution pipe, a first downstream pipe bundle set, a second downstream pipe bundle set and a reverse flow pipe bundle set which are the same in length are arranged on the peripheral side of the steam distribution pipe, and a reverse flow pipe bundle box is located between the first downstream pipe bundle set and the second downstream pipe bundle set. The sides, away from the steam distribution pipe, of the first downstream pipe bundle set and the reverse flow pipe bundle set are jointly and fixedly provided with a first confluence pipe bundle, the side, away from the steam distribution pipe, of the second downstream pipe bundle set is provided with a second confluence pipe bundle, and the first confluence pipe bundle is not communicated with the second confluence pipe bundle. Steam is uniformly distributed to the first down-flow tube bundle group through the steam distribution tube firstly and exchanges heat with air for the first time, and the rest of steam which is not converted into liquid water enters the steam distribution tube through the counter-flow tube bundle group and enters the second down-flow tube bundle group along the steam distribution tube to be cooled.

Description

Technical Field

[0001] The invention relates to the technical field of air coolers, and in particular to a direct air cooler. Background Art

[0002] Air cooler is a device that directly exchanges heat between turbine exhaust steam and air, and is widely used in industrial fields such as power plants and chemical plants. The traditional air cooler tube bundle structure has problems such as unreasonable tube bundle length design and low heat exchange efficiency.

[0003] The existing downstream and upstream tube bundles often have differences in length during the design process, such as Figure 1 Generally speaking, the length of the downstream tube bundle is significantly longer than that of the upstream tube bundle, about 0.5 meters longer, which directly leads to the following problems: Design complexity is greatly increased: Due to the length difference, the structural design, size determination, material selection and other aspects of the downstream and upstream tube bundles are more complicated, which increases the design difficulty and cost.

[0004] Increased installation difficulty: The structural complexity caused by the length difference also makes installation and maintenance more difficult and time-consuming, reducing the convenience and economy of the project. Summary of the invention

[0005] In order to solve at least one of the technical problems mentioned in the background technology, the object of the present invention is to provide a direct air cooler to simplify the design process and shorten the installation time.

[0006] To achieve the above object, the present invention provides the following technical solution: a direct air cooler, comprising a steam distribution pipe, wherein a first downstream tube bundle group, a second downstream tube bundle group and a countercurrent tube bundle group are arranged around the steam distribution pipe, wherein the first downstream tube bundle group, the second downstream tube bundle group and the countercurrent tube bundle group have the same axial length, and the countercurrent tube bundle group is located between the first downstream tube bundle group and the second downstream tube bundle group; The first downstream tube bundle group and the second downstream tube bundle group are connected to the steam distribution pipe, and the first downstream tube bundle group and the countercurrent tube bundle group are jointly fixedly installed with a first busbar tube bundle on a side away from the steam distribution pipe, and the second busbar tube bundle is installed on a side of the second downstream tube bundle group away from the steam distribution pipe, the first busbar tube bundle and the second busbar tube bundle are not connected, and the countercurrent tube bundle group is connected to an exhaust pipe on a side away from the first busbar tube bundle.

[0007] The steam distribution pipe includes a first pipe and a second pipe, the first pipe is an air inlet pipe, the second pipe is an air outlet pipe, the inner diameter of the first pipe is larger than that of the second pipe, the first downstream tube bundle group is located on the side surface of the first pipe, and the second downstream tube bundle group is located on the side surface of the second pipe.

[0008] Furthermore, a pipe box is provided at the lower side of the steam distribution pipe, and the first downstream tube bundle group, the second downstream tube bundle group and the countercurrent tube bundle group are all connected to the pipe box.

[0009] Furthermore, the pipe box and the steam distribution pipe are fixed by welding.

[0010] Furthermore, the tube box is composed of a cover plate, an end plate and a tube plate.

[0011] Furthermore, the first downstream tube bundle group, the countercurrent tube bundle group and the second downstream tube bundle group are all composed of a plurality of fin tubes, and each fin tube has the same length.

[0012] Furthermore, a relief valve is provided on the upper side of the steam pipe, and the relief valve is located on the peripheral side of the first pipe.

[0013] Furthermore, the pipe box is provided with a plurality of check rings within the range of the countercurrent pipe bundle group, and the inner diameter of the check rings gradually decreases along the steam flow direction.

[0014] Compared with the prior art, the beneficial effect of the present invention is that by setting the steam distribution pipe, the first downstream tube bundle group, the second downstream tube bundle group and the countercurrent tube bundle group, a more efficient steam cooling work efficiency is achieved. Specifically, the steam is first evenly distributed to the first downstream tube bundle group through the steam distribution pipe, and the first heat exchange is carried out with the air. The internal water vapor is partially converted into liquid water and enters the first converging tube bundle along the first downstream tube bundle group. The remaining water vapor that has not been converted into liquid water enters the countercurrent tube bundle group. In the countercurrent tube bundle group, the water vapor is cooled again and converted into liquid water. The gas is discharged to the outside by the countercurrent tube bundle group. At the same time, the water vapor in the steam distribution pipe that has not entered the first downstream tube bundle group will enter the second downstream tube bundle group along the steam distribution pipe for cooling. Due to the countercurrent configuration of the first and second downstream tube bundle groups and the countercurrent tube bundle group, sufficient cooling of the steam and water acquisition are achieved, and finally the purpose of efficient and energy-saving cooling is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the prior art of the present invention; Figure 2 It is a schematic diagram of the overall structure of the present invention; Figure 3 It is a schematic diagram of the steam distribution pipe of the present invention; Figure 4 It is a cross-sectional view of a second pipeline of the present invention.

[0016] In the figure: 1, steam distribution pipe; 11, first pipeline; 12, second pipeline; 2, first downstream tube bundle group; 3, second downstream tube bundle group; 4, upstream tube bundle group; 5, first converging tube bundle; 6, second converging tube bundle; 7, pipe box; 8, discharge valve; 9, check ring. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 2-Figure 4 The present embodiment provides a direct air cooler, comprising a steam distribution pipe 1, wherein a first downstream tube bundle group 2, a second downstream tube bundle group 3 and a countercurrent tube bundle group 4 are arranged on the circumference of the steam distribution pipe 1, wherein the first downstream tube bundle group 2, the second downstream tube bundle group 3 and the countercurrent tube bundle group 4 have the same axial length, and the countercurrent tube bundle group 4 is located between the first downstream tube bundle group 2 and the second downstream tube bundle group 3; the first downstream tube bundle group 2 and the second downstream tube bundle group 3 are connected to the steam distribution pipe 1, and a first busbar tube bundle 5 is fixedly installed on the side of the first downstream tube bundle group 2 and the countercurrent tube bundle group 4 away from the steam distribution pipe 1, and a second busbar tube bundle 6 is installed on the side of the second downstream tube bundle group 3 away from the steam distribution pipe 1, the first busbar tube bundle 5 is not connected to the second busbar tube bundle 6, and an exhaust pipe is connected to the side of the countercurrent tube bundle group away from the first busbar tube bundle.

[0019] By setting the steam distribution pipe 1, the first downstream tube bundle group 2, the second downstream tube bundle group 3 and the countercurrent tube bundle group 4, a more efficient steam cooling work efficiency is achieved. Specifically, the steam is first evenly distributed to the first downstream tube bundle group 2 through the steam distribution pipe 1, and the first heat exchange with the air is carried out. The internal water vapor is partially converted into liquid water and enters the first converging tube bundle 5 along the first downstream tube bundle group 2. The remaining water vapor that has not been converted into liquid water enters the countercurrent tube bundle group 4. In the countercurrent tube bundle group 4, the water vapor is cooled again and converted into liquid water. The gas is discharged from the countercurrent tube bundle group 4. At the same time, the water vapor in the steam distribution pipe 1 that has not entered the first downstream tube bundle group 2 will enter the second downstream tube bundle group 3 along the steam distribution pipe 1 for cooling. Due to the countercurrent configuration of the first and second downstream tube bundle groups 3 and the countercurrent tube bundle group 4, sufficient cooling of the steam and water acquisition are achieved, and finally the purpose of efficient and energy-saving cooling is achieved.

[0020] The steam distribution pipe 1 includes a first pipe 11 and a second pipe 12. The first pipe 11 is an air inlet pipe, and the second pipe 12 is an air outlet pipe. The inner diameter of the first pipe 11 is larger than that of the second pipe 12. The first downstream tube bundle group 2 is located on the side of the first pipe 11, and the second downstream tube bundle group 3 is located on the side of the second pipe 12.

[0021] The steam distribution efficiency is improved through the structural design of the air inlet and outlet pipes. The characteristic is that the inner diameter of the first pipe 11 (air inlet pipe) is larger than that of the second pipe 12 (air outlet pipe), so as to realize the change of water vapor pressure. As the pipe diameter decreases, the pressure in the pipe will increase, thereby increasing the pressure at the inlet of the second downstream tube bundle group 4, thereby increasing the steam flow rate in the second downstream tube bundle group 4 and reducing the increase in pressure loss due to the same pipe diameter. When it reaches the second downstream tube bundle group 4, the steam pressure decreases, and the flow rate gradually decreases, which will affect the heat load of the second downstream tube bundle group 4. The above design greatly improves the balanced characteristics of steam flow and heat transfer in the second downstream tube bundle group 4, and also realizes structural antifreeze. Through this structural design, the steam distribution is more uniform and efficient, thereby improving the operating performance of the entire system.

[0022] The whole process uses a more reasonable tube bundle arrangement and structural design to improve the condensation efficiency. Specifically, it sets the first and second downstream tube bundle groups 3 and a countercurrent tube bundle group 4 on the periphery of the steam distribution pipe 1, and adopts two sets of independent converging tube bundle system layouts to enable steam and cold air to exchange heat at a higher efficiency.

[0023] A pipe box 7 is provided at the lower side of the steam distribution pipe 1, and the first downstream tube bundle group 2, the second downstream tube bundle group 3 and the countercurrent tube bundle group 4 are all connected to the pipe box 7. The pipe box 7 and the steam distribution pipe 1 are fixed by welding, wherein the pipe box 7 is composed of a cover plate, an end plate and a tube plate.

[0024] A pipe box 7 is arranged at the lower side of the steam distribution pipe 1, so that the first downstream pipe bundle group 2, the second downstream pipe bundle group 3 and the countercurrent pipe bundle group 4 are respectively connected to the pipe box 7, which solves the problem of uneven steam distribution and low thermal efficiency in the traditional process. At the same time, the pipe 7 and the steam distribution pipe 1 are directly welded together before the overall assembly, thereby reducing transportation costs, reducing welding steps, reducing the difficulty of on-site welding, and improving assembly efficiency.

[0025] Since the pipe box 7 and the steam distribution pipe 1 are fixed by welding, there is no need to manufacture and transport the pipe box 7 separately. The upper pipe box 7 is composed of a cover plate, an end plate, a tube plate and a steam distribution, which reduces overall consumables.

[0026] The first downstream tube bundle group 2, the upstream tube bundle group 4 and the second downstream tube bundle group 3 are all composed of a plurality of fin tubes, and each fin tube has the same length.

[0027] By setting up three tube bundle groups arranged in an orderly manner: the first downstream tube bundle group 2, the countercurrent tube bundle group 4 and the second downstream tube bundle group 3, each of which is composed of a number of finned tubes of the same length, an efficient heat transfer effect is achieved. All finned tubes have the same length and similar structure, which is convenient for later procurement and welding operations in later assembly.

[0028] A relief valve 8 is provided on the upper side of the steam pipeline, and the relief valve 8 is located on the side of the first pipeline 11, so as to facilitate the pressure reduction in the steam distribution pipe 1.

[0029] A plurality of check rings 9 are fixedly installed on the inner wall of the second pipe 12. The inner diameter of the check rings 9 gradually decreases along the flow direction of steam in the second pipe 12. There are a plurality of check rings 9 located within the distribution range of the countercurrent tube bundle box.

[0030] When the steam enters the pipe box 7, it encounters the gradually shrinking check ring 9, which is equivalent to creating a gradually narrowing channel, thereby increasing the speed and flow rate of the steam in the pipe box 7. At the same time, when the steam enters the pipe box 7 from the countercurrent tube bundle group 4, if the steam flow direction is chaotic and there is a countercurrent in the pipe box 7, the design of each check ring 9 can prevent the steam from flowing in the opposite direction, ensuring that the steam flows in the predetermined direction, avoiding energy loss and potential safety hazards.

[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A direct air cooler, comprising a steam distribution pipe (1), wherein a first downstream tube bundle group (2), a second downstream tube bundle group (3) and a countercurrent tube bundle group (4) are arranged on the circumference of the steam distribution pipe (1), wherein the first downstream tube bundle group (2), the second downstream tube bundle group (3) and the countercurrent tube bundle group (4) have the same axial length, and the countercurrent tube bundle group (4) is located between the first downstream tube bundle group (2) and the second downstream tube bundle group (3); The first downstream tube bundle group (2) and the second downstream tube bundle group (3) are connected to the steam distribution pipe (1); a first busbar tube bundle (5) is fixedly mounted on the side of the first downstream tube bundle group (2) and the countercurrent tube bundle group (4) away from the steam distribution pipe (1); a second busbar tube bundle (6) is mounted on the side of the second downstream tube bundle group (3) away from the steam distribution pipe (1); the first busbar tube bundle (5) and the second busbar tube bundle (6) are not connected; and an exhaust pipe is connected to the side of the countercurrent tube bundle group away from the first busbar tube bundle. The steam distribution pipe (1) comprises a first pipe (11) and a second pipe (12); the first pipe (11) is an air inlet pipe, the second pipe (12) is an air outlet pipe, the inner diameter of the first pipe (11) is larger than that of the second pipe (12), the first downstream pipe bundle group (2) is located on a side surface around the first pipe (11), and the second downstream pipe bundle group (3) is located on a side surface around the second pipe (12).

2. The direct air cooler according to claim 1, characterized in that: A pipe box (7) is provided at the lower side of the steam distribution pipe (1); the first downstream tube bundle group (2), the second downstream tube bundle group (3) and the countercurrent tube bundle group (4) are all connected to the pipe box (7); the first downstream tube bundle group (2) and the second downstream tube bundle group (3) are connected to the steam distribution pipe (1) through the pipe box (7); and the countercurrent tube bundle group (4) is connected to the exhaust pipe through the pipe box 7.

3. The direct air cooler according to claim 2, characterized in that: The pipe box (7) and the steam distribution pipe (1) are fixed by welding.

4. The direct air cooler according to claim 2, characterized in that: The tube box (7) consists of a cover plate, an end plate and a tube plate.

5. The direct air cooler according to claim 1, characterized in that: The first downstream tube bundle group (2), the upstream tube bundle group (4) and the second downstream tube bundle group (3) are all composed of a plurality of finned tubes, and each finned tube has the same length.

6. The direct air cooler according to claim 1, characterized in that: A discharge valve (8) is provided on the upper side of the steam pipeline, and the discharge valve (8) is located on the side surface of the first pipeline (11).

7. The direct air cooler according to claim 1, characterized in that: The pipe box (7) is provided with a plurality of check rings (9) within the range of the counter-flow pipe bundle group (4), and the inner diameter of the check ring (9) gradually decreases along the steam flow direction.

Images