Flow dividing type heat regenerator

Abstract

The utility model discloses a shunting type heat regenerator which comprises a tube pass and a shell pass, the tube pass comprises a tube bundle assembly (5), and the tube bundle assembly (5) mainly comprises an inlet header (5-2), a tube bundle (5-3) and an outlet header (5-2); the shell pass comprises an inlet smoke box (1), an inlet smoke box transition section I (2), an inlet smoke box transition section II (3), a middle shell (4), an outlet smoke box transition section I (6), an outlet smoke box transition section II (7) and an outlet smoke box (8). Air passes through a tube pass, and smoke passes through a shell pass. The inlet smoke box (1) is provided with a fork opening (1-4), and the outlet smoke box (8) is provided with a closing opening. According to the equipment, inlet flue gas is shunted, so that the flue gas flow distribution is more reasonable, the heat exchange structure is compact in design, hot fluid releases heat when passing through the shunting type heat regenerator, and cooling fluid absorbs the heat. The utilization rate of heat energy is effectively increased, efficient utilization of energy is achieved, and important economic and environmental benefits are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a split-flow regenerator in a gas turbine flue gas cooling heat recovery system of a high-efficiency new cycle test bench. Background Art

[0002] The regenerator is a very important heat exchange equipment. It plays an important role in industry, power generation, transportation, household appliances and other aspects, and brings important economic and environmental benefits. Its function is to recover heat in the hot fluid and transfer it to the cooling fluid. Energy transfer is achieved through heat transfer between the two fluids. Generally, a split-flow regenerator consists of two main parts: a hot fluid side and a cooling fluid side. The hot fluid releases heat when passing through the split-flow regenerator, while the cooling fluid absorbs this part of the heat. With the continuous advancement of technology, the performance of the split-flow regenerator will be further improved, and its application range will be more extensive. However, the large-scale split-flow regenerators used in practice have practical problems such as uneven flow rate and poor heat exchange. The split-flow regenerator mentioned in the utility model is a device widely used in thermal power plants. By recovering and utilizing heat, it overcomes the above unfavorable factors, improves energy utilization, saves energy, and protects the environment. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a split-flow regenerator to recover high-temperature waste heat in flue gas of a power turbine of a gas turbine and heat compressed air.

[0004] The technical solution employed by this utility model is a split-flow regenerator consisting of a tube side and a shell side. The tube side includes a tube bundle assembly, specifically an inlet header, a tube bundle, and an outlet header. The shell side primarily comprises an inlet smoke box, an inlet smoke box transition section, an intermediate shell, an outlet smoke box transition section, and an outlet smoke box. Air flows through the tube side, while flue gas flows through the shell side.

[0005] The inlet smoke box transition section includes the inlet smoke box transition section I and the inlet smoke box transition section II.

[0006] The exit smoke box transition section includes exit smoke box transition section I and exit smoke box transition section II.

[0007] The inlet smoke box comprises an inlet flange, an inlet expansion joint, a rear flange, a fork and an inlet shell.

[0008] The intermediate casing comprises an intermediate section casing, an intermediate section casing support, and an intermediate casing flange assembly.

[0009] The outlet smoke box comprises a front flange, an outlet flange, a closing end, an outlet shell and an outlet expansion joint.

[0010] The inlet smoke box is located at the front end of the intermediate shell, the outlet smoke box is located at the rear end of the intermediate shell, the inlet smoke box transition section I and the inlet smoke box transition section II are located between the inlet smoke box and the intermediate shell, and the outlet smoke box transition section I and the outlet smoke box transition section II are located between the outlet smoke box and the intermediate shell. It is characterized in that: the tube bundle is located inside the intermediate shell, the outlet header and the inlet header are located at the upper end of the intermediate shell, the inlet smoke box has a fork to separate the two rear flanges, which are respectively connected to the inlet smoke box transition section I and the inlet smoke box transition section II arranged in a mirror image. The intermediate shell has two parts, the front end is respectively connected to the inlet smoke box transition section I and the inlet smoke box transition section II, and the rear end is respectively connected to the outlet smoke box transition section I and the outlet smoke box transition section II arranged in a mirror image. The outlet smoke box has a closing end, and the two front flanges are connected to the outlet smoke box transition section I and the outlet smoke box transition section II to form an outlet flange. The front end of the inlet smoke box is provided with an inlet expansion joint, and the rear end of the outlet smoke box is provided with an outlet expansion joint.

[0011] The tube bundle of the tube bundle assembly is arranged in a serpentine-shaped stack, and the openings of the inlet and outlet headers are arranged in a staggered manner.

[0012] The inlet smoke box, the inlet smoke box transition section I, the inlet smoke box transition section II, the intermediate shell, the outlet smoke box transition section I, the outlet smoke box transition section II and the outlet smoke box are flange-connected with each other in a square cone-shaped structure.

[0013] Flue gas is discharged from the gas turbine power turbine flue gas outlet and enters the inlet flue gas box, inlet flue gas box transition section, intermediate casing, outlet flue gas box transition section, and outlet flue gas box in sequence. The gas turbine exhaust flow direction is horizontal. The split-flow regenerator shell adopts a split-flow-and-collection structure, which optimizes flue gas flow distribution. The casing adopts a segmented structure, with flange bolts connecting each section, eliminating on-site welding. The segmented equipment facilitates transportation and allows for installation within limited on-site space. The inner and outer guard plates are fully welded to the frame, ensuring the equipment's sealing performance. Steel sections are used for tensioning between the inner and outer guard plates, which also serve as a thermal insulation framework. The shell structure is rationally designed and advanced. The heat exchange tubes in the intermediate heat exchange section adopt a serpentine structure and are closely arranged, making the structure more compact and space-saving. Air enters the heat exchange tubes from the inlet header and is then collected in the outlet header. The header is designed as a pressure vessel and strictly complies with standard specifications. Considering that the working medium of the equipment is gaseous, an exhaust vent is installed at the top of each header to allow the internal gas to be completely exhausted after the equipment pressure test.

[0014] The beneficial effect of the utility model is to provide a split-flow regenerator.

[0015] 1. The split-flow regenerator shell adopts a split-flow and then convergence structure, making the flue gas flow distribution more reasonable. The inlet smoke box is equipped with an expansion joint to eliminate deformation stress.

[0016] 2. The shell adopts a segmented structure, with flange bolts connecting each part, eliminating on-site welding. The segmented equipment facilitates transportation and can be installed within limited on-site space. The main frame is made of rectangular tubes and is fully welded. The inner and outer guard plates are fully welded to the frame to ensure the sealing performance of the equipment. The inner and outer guard plates are supported by steel sections, which also serve as a framework for insulation. The shell structure design is reasonable and advanced.

[0017] 3. The heat exchange tubes in the intermediate heat exchange section adopt a serpentine tube structure and are arranged closely, making the structure more compact and saving space. After the air enters the heat exchange tubes from the inlet header, it is collected in the outlet header. The header is designed as a pressure vessel and strictly complies with the requirements of standards and specifications. Considering that the working medium of the equipment is in the gas phase, an exhaust hole is set at the top of each header so that the internal gas can be completely emptied after the equipment pressure test. Because the split-flow regenerator exchanges heat between flue gas and air, the physical properties of flue gas and air are very similar, and the structure of its heat exchange tubes must be a smooth tube. At the same time, considering that the pressure on the air side is higher, the flue gas outside the tube can be used to heat the air inside the tube. The flow of air inside the tube can greatly reduce the volume on the air side and avoid the problem of thick material thickness caused by high pressure. Therefore, the split-flow regenerator finally uses a serpentine tube structure.

[0018] 4. The serpentine tubes are designed with a diameter of φ25. This specification offers a higher heat transfer coefficient than larger diameter tubes. The staggered arrangement of the serpentine tubes significantly improves the heat transfer coefficient of the split-flow regenerator and reduces the overall length of the equipment compared to an in-line arrangement. However, this also increases the resistance on the flue gas side compared to an in-line arrangement. To ensure that the resistance on the flue gas and working fluid sides does not exceed the required values, the lateral and longitudinal structures of the serpentine tubes must be rationally designed to ensure that the flue gas and working fluid flow rates are within the appropriate range. The serpentine tubes are arranged in multiple rows both horizontally and vertically. Furthermore, multiple serpentine tubes are connected to the header in parallel to increase the flow area for the medium and reduce its flow rate. Calculations show that both the heated area and the flue gas resistance of this structure are within the required range.

[0019] In summary, the split-flow regenerator of this utility model exchanges heat between the hot fluid side and the cooling fluid side. The hot fluid releases heat as it passes through the split-flow regenerator, while the cooling fluid absorbs this heat. This utility model effectively improves the utilization rate of thermal energy, achieves efficient energy use, and has significant economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a top view of a split-flow regenerator of the utility model;

[0022] Figure 2 This is a front view of the utility model split-flow regenerator;

[0023] Figure 3 This is a split-flow regenerator tube bundle assembly of the utility model (AA enlarged view);

[0024] Figure 4 This utility model is a split-flow regenerator Figure 3 C-direction view of the view; DETAILED DESCRIPTION

[0025] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show components related to the present invention.

[0026] like Figure 1 ,like Figure 2 The figure shows a top view of the split-flow regenerator of the present invention, which is a preferred embodiment of the present invention. The split-flow regenerator refers to a split-flow regenerator comprising an inlet smoke box 1, an inlet smoke box transition section I 2, an inlet smoke box transition section II 3, an intermediate shell 4, a tube bundle assembly 5, an outlet smoke box transition section I 6, an outlet smoke box transition section II 7, an outlet smoke box 8, and a support 9.

[0027] The inlet smoke box 1 includes an inlet flange 1-1, an inlet shell 1-5, an expansion joint 1-3, a rear flange 1-2, a fork 1-4 and a shell support I 1-6. The outlet smoke box 8 includes a front flange 8-1, an outlet flange 8-2, a closing end 8-3, an outlet shell 8-4, an outlet expansion joint 8-5 and a shell support II 8-6.

[0028] The inlet smoke box transition section I2 includes a front transition section shell I2-1 and a front shell support I2-2, and the inlet smoke box transition section II3 includes a front transition section shell II3-1 and a front shell support II3-2; the inlet smoke box transition section I2 and the inlet smoke box transition section II3 are arranged in a mirror image.

[0029] The outlet smoke box transition section I6 includes a rear transition section shell I6-1 and a rear shell support I6-2, and the outlet smoke box transition section II7 includes a rear transition section shell II7-1 and a rear shell support II7-2. The outlet smoke box transition section I6 and the outlet smoke box transition section II7 are arranged in a mirror image.

[0030] The intermediate casing 4 comprises an intermediate section casing 4-2, an intermediate section casing support 4-3, and an intermediate casing flange assembly 4-1.

[0031] like Figure 2 The figure shows the front view of the split-flow regenerator of the present invention, in which the support 9 horizontally supports the entire split-flow regenerator.

[0032] like Figure 1 、 Figure 2 、 Figure 3 The figure shows two sets of tube bundle assemblies 5 for the split-flow regenerator of the present invention, each comprising an inlet header 5-2, a tube bundle 5-3, and an outlet header 5-1. Tube bundle 5-3 includes heat exchange tubes 5-3-1 and a support frame 5-3-2. Heat exchange tubes 5-3-1 are U-shaped. Air inlets a1 and a2, air outlets b1 and b2, pressure gauge ports p1 and p1, temperature gauge ports t1 and t2, exhaust ports w1, w2, w3, and w4, safety valve ports f1 and f1, and manholes k1, k2, k3, and k4 are provided in the inlet header 5-2 and outlet header 5-1, respectively.

[0033] like Figure 3 、 Figure 4 The figure shows the layout of the header openings of the split-flow regenerator of the present invention. The heat exchange tubes 5-3-1 are serpentine tubes arranged in staggered rows.

[0034] The tube bundle 5 - 3 is installed in the middle shell 4 , and the inlet header 5 - 2 and the outlet header 5 - 1 are located at the upper end of the middle shell 4 .

Claims

1. A split-flow regenerator, comprising a tube side and a shell side, wherein the tube side comprises a tube bundle assembly (5), and the shell side comprises an inlet smoke box (1), an inlet smoke box transition section, an intermediate shell (4), an outlet smoke box transition section, and an outlet smoke box (8); The inlet smoke box transition section includes an inlet smoke box transition section I (2) and an inlet smoke box transition section II (3); The outlet smoke box transition section includes an outlet smoke box transition section I (6) and an outlet smoke box transition section II (7); The inlet smoke box (1) comprises an inlet flange (1-1), an inlet expansion joint (1-3), a rear flange (1-2), a fork (1-4) and an inlet shell (1-5); the intermediate shell (4) comprises an intermediate section shell (4-2), an intermediate section shell support (4-3) and an intermediate shell flange assembly (4-1); The outlet smoke box (8) comprises a front flange (8-1), an outlet flange (8-2), a closing end (8-3), an outlet shell (8-4) and an outlet expansion joint (8-5); the tube bundle assembly (5) comprises an outlet header (5-1), a tube bundle (5-3) and an inlet header (5-2); The inlet smoke box (1) is located at the front end of the intermediate shell (4), the outlet smoke box (8) is located at the rear end of the intermediate shell (4), the inlet smoke box transition section I (2) and the inlet smoke box transition section II (3) are located between the inlet smoke box (1) and the intermediate shell (4), and the outlet smoke box transition section I (6) and the outlet smoke box transition section II (7) are located between the outlet smoke box (8) and the intermediate shell (4), characterized in that: The tube bundle (5-3) is located inside the intermediate shell (4), the outlet header (5-1) and the inlet header (5-2) are located at the upper end of the intermediate shell (4), the inlet smoke box (1) has a fork (1-4) separating the two rear flanges (1-2), which are respectively connected to the inlet smoke box transition section I (2) and the inlet smoke box transition section II (3) arranged in a mirror image, the intermediate shell (4) has two parts, the front end of which is respectively connected to the inlet smoke box transition section I (2) and the inlet smoke box transition section II (3), and the rear end of which is respectively connected to the outlet smoke box transition section I (6) and the outlet smoke box transition section II (7) arranged in a mirror image, the outlet smoke box (8) has a closing end (8-3), the two front flanges (8-1) are connected to the outlet smoke box transition section I (6) and the outlet smoke box transition section II (7), and merged into an outlet flange (8-2), the front end of the inlet smoke box (1) is provided with an inlet expansion joint (1-3), and the rear end of the outlet smoke box (8) is provided with an outlet expansion joint (8-5).

2. The split-flow regenerator according to claim 1, characterized in that: The tube bundle (5-3) of the tube bundle assembly (5) is arranged in a stacked manner with a single tube in a serpentine shape, and the openings of the inlet header (5-2) and the outlet header (5-1) are arranged in a staggered manner.

3. The split-flow regenerator according to claim 1, characterized in that: The inlet smoke box (1), the inlet smoke box transition section I (2), the inlet smoke box transition section II (3), the intermediate shell (4), the outlet smoke box transition section I (6), the outlet smoke box transition section II (7) and the outlet smoke box (8) are connected by flanges and have a square cone structure.

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