Horizontal energy saver for boiler

Abstract

The horizontal energy saver for the boiler comprises a tail gas waste heat exchanger and a steam heat exchanger, the tail gas waste heat exchanger comprises a rectangular box body, an air inlet nozzle and an air outlet nozzle are arranged on the outer side face of the rectangular box body, a plurality of partition plates are evenly distributed in the rectangular box body from top to bottom, and S-shaped metal pipes are laid on the upper surfaces of the partition plates; the S-shaped metal pipes are connected end to end in series, the lowest ends of the S-shaped metal pipes are connected with the water outlet pipe, and the first strip-shaped array heat exchange pieces and the second strip-shaped array heat exchange pieces are arranged on the outer side faces of the S-shaped metal pipes. The steam heat exchanger comprises a cylindrical shell, a heat exchange pipe is arranged in the cylindrical shell, and the left end of the heat exchange pipe is connected with a liquid inlet nozzle. The horizontal energy saver for the boiler can effectively prolong the contact time of tail gas and cold water, so that the cold water can absorb the heat of the tail gas as much as possible, meanwhile, the heat in boiler steam can be recycled, and the energy is saved. Waste heat can be effectively recycled and utilized, and energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of boiler energy saving, and in particular to a horizontal economizer for a boiler. Background Art

[0002] Boiler economizer is an important energy-saving device used to improve the thermal efficiency of the boiler system and reduce energy consumption. The working principle of boiler economizer is to use the flue gas at the tail of the boiler to enter the economizer, absorb the waste heat in the flue gas through the finned tube, and then recycle this part of the heat, thereby reducing energy consumption and improving the overall thermal efficiency of the boiler. Boiler economizer plays a vital role in modern industrial production. It achieves energy conservation and emission reduction by improving heat exchange efficiency, recovering and utilizing waste heat, which not only reduces energy consumption, but also reduces environmental pollution.

[0003] When the boiler economizer commonly used in factories is in use, the contact time between the high-temperature flue gas and the hot water is too short, resulting in incomplete heat recovery of the high-temperature flue gas, thereby reducing the working efficiency of the economizer. At the same time, when the boiler is working, a large amount of hot steam will be generated, which is often directly discharged into the air, also resulting in energy waste. Summary of the invention

[0004] The present application provides a horizontal economizer for a boiler, which can effectively increase the contact time between exhaust gas and cold water, so that the cold water can absorb the heat of the exhaust gas as much as possible, and can also recover the heat in the boiler steam, which can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the present application provides the following technical solution: a horizontal economizer for a boiler, comprising a tail gas waste heat exchanger and a steam heat exchanger.

[0006] The exhaust gas waste heat exchanger includes a rectangular box body, the outer side of the rectangular box body is provided with an air inlet nozzle and an air outlet nozzle, the interior of the rectangular box body is evenly distributed with a plurality of partitions from top to bottom, the upper surfaces of the partitions are laid with S-shaped metal tubes, the S-shaped metal tubes are connected in series end to end, the lower end of the S-shaped metal tube is connected to a water outlet pipe, and the outer side of the S-shaped metal tube is provided with a strip array heat exchange plate 1 and a strip array heat exchange plate 2.

[0007] The steam heat exchanger includes a cylindrical shell, a heat exchange tube is arranged inside the cylindrical shell, the left end of the heat exchange tube is connected to a liquid inlet nozzle, the right end of the heat exchange tube is connected to the uppermost end of the S-shaped metal tube through a connecting tube, an annular metal plate is arranged on the outer side of the heat exchange tube, and a steam inlet pipe is arranged on the end of the outer side of the cylindrical shell away from the liquid inlet nozzle.

[0008] Preferably, the air inlet nozzle is arranged on the lower left side of the outer side surface of the rectangular box body, and the air outlet nozzle is arranged on the upper right side of the outer side surface of the rectangular box body.

[0009] Preferably, one end of the partition is connected to the inner side of the rectangular box, and a gap is provided between the other end and the inner wall of the rectangular box. The partition is connected to the left inner side or the right inner side of the rectangular box, and adjacent partitions are connected to different inner sides of the rectangular box.

[0010] Preferably, the upper and lower layers of S-shaped metal tubes are connected together by a U-shaped connector.

[0011] Preferably, the deflection angles of the heat exchanger plates constituting the first strip array heat exchanger plate and the second strip array heat exchanger plate are opposite, and the heat exchanger plates are made of heat conductive material.

[0012] Preferably, the cylindrical shell is fixed to the upper surface of the rectangular box through a support frame.

[0013] Preferably, a drain pipe is provided on a side of the lower end of the outer side surface of the cylindrical shell away from the steam inlet pipe, and a pressure relief pipe is installed on the cylindrical shell, and a safety valve is installed on the pressure relief pipe.

[0014] Compared with the prior art, the beneficial effects of this application are:

[0015] 1. The horizontal economizer used in this boiler can effectively increase the contact time between tail gas and cold water, so that the cold water can absorb the heat of tail gas as much as possible. At the same time, it can also recover the heat in the boiler steam, effectively recover and utilize the waste heat, and achieve energy saving and emission reduction;

[0016] 2. The high-temperature exhaust gas enters the interior of the rectangular box through the air inlet nozzle. While the high-temperature exhaust gas goes up along the S-shaped guide channel between the partition and the inner wall of the rectangular box, the high-temperature exhaust gas fully contacts the S-shaped metal tube and the strip array heat exchanger sheet 1 and the strip array heat exchanger sheet 2 installed on the outer surface of the S-shaped metal tube. The heat of the high-temperature exhaust gas is absorbed by the cold water flowing through the inside of the S-shaped metal tube, and the low-temperature exhaust gas is discharged through the air outlet nozzle;

[0017] 3. High-temperature steam enters the interior of the cylindrical shell through the steam inlet pipe, and the water vapor condenses into water droplets on the outer surface of the annular metal plate. At this time, the heat generated by the condensation of steam is absorbed by the cold water flowing through the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of this application;

[0019] Figure 2 This is the main cross-sectional view of this application;

[0020] Figure 3 for Figure 2 Schematic diagram of the cross section at AA in the middle.

[0021] In the figure: 1 cylindrical shell, 2 support frame, 3 liquid inlet nozzle, 4 air inlet nozzle, 5 water outlet pipe, 6 rectangular box, 7 air outlet nozzle, 8 connecting pipe, 9 heat exchange pipe, 10 safety valve, 11 drain pipe, 12 annular metal plate, 13 steam inlet pipe, 14 U-shaped connector, 15 partition, 16 S-shaped metal pipe, 17 strip array heat exchange plate 1, 18 strip array heat exchange plate 2. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] In the description of this application, if the orientation description is involved, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the attached Figure 2 The orientation or position relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of the present application. When a feature is referred to as being "set", "fixed", or "connected" to another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, or connected to the other feature.

[0024] See also Figure 1-3 , the present application provides the following technical solutions: a horizontal economizer for a boiler, comprising an exhaust gas waste heat exchanger and a steam heat exchanger.

[0025] Specifically, the exhaust gas waste heat exchanger is used to recover the heat contained in the exhaust gas, and the steam heat exchanger is used to recover the heat contained in the boiler exhaust steam.

[0026] The exhaust gas waste heat exchanger includes a rectangular box body 6, the outer side of the rectangular box body 6 is provided with an air inlet nozzle 4 and an air outlet nozzle 7, the interior of the rectangular box body 6 is evenly distributed with a plurality of partitions 15 from top to bottom, the upper surface of the partition 15 is paved with S-shaped metal tubes 16, the S-shaped metal tubes 16 are connected in series end to end, the lower end of the S-shaped metal tube 16 is connected to the water outlet pipe 5, and the outer side of the S-shaped metal tube 16 is provided with a strip array heat exchange plate 1 17 and a strip array heat exchange plate 2 18.

[0027] Specifically, the high-temperature exhaust gas enters the interior of the rectangular box 6 through the air inlet nozzle 4. While the high-temperature exhaust gas goes up along the S-shaped guide channel between the partition 15 and the inner wall of the rectangular box 6, the high-temperature exhaust gas is fully in contact with the S-shaped metal tube 16 and the strip array heat exchange plate 1 17 and the strip array heat exchange plate 2 18 installed on the outer surface of the S-shaped metal tube 16. The heat of the high-temperature exhaust gas is absorbed by the cold water flowing through the inside of the S-shaped metal tube 16, and the low-temperature exhaust gas is discharged through the air outlet nozzle 7.

[0028] More specifically, the outer side surface of the rectangular box 6 is paved with a heat-insulating layer.

[0029] The steam heat exchanger includes a cylindrical shell 1, a heat exchange tube 9 is arranged inside the cylindrical shell 1, the left end of the heat exchange tube 9 is connected to the liquid inlet nozzle 3, the right end of the heat exchange tube 9 is connected to the uppermost end of the S-shaped metal tube 16 through a connecting pipe 8, an annular metal plate 12 is arranged on the outer side of the heat exchange tube 9, and a steam inlet pipe 13 is arranged on the end of the outer side of the cylindrical shell 1 away from the liquid inlet nozzle 3.

[0030] Specifically, high-temperature steam enters the interior of the cylindrical shell 1 through the steam inlet pipe 13, and the water vapor condenses into water droplets on the outer surface of the annular metal plate 12. At this time, the heat generated by the condensation of the steam is absorbed by the cold water flowing through the heat exchange tube 9.

[0031] Furthermore, the air inlet nozzle 4 is arranged at the lower left side of the outer side surface of the rectangular box body 6 , and the air outlet nozzle 7 is arranged at the upper right side of the outer side surface of the rectangular box body 6 .

[0032] Specifically, the high-temperature exhaust gas can fully contact the heat exchanger while rising, thereby improving the heat exchange efficiency.

[0033] Furthermore, one end of the partition 15 is connected to the inner side surface of the rectangular box 6 , and a gap is provided between the other end and the inner wall of the rectangular box 6 . Adjacent partitions 15 are respectively installed on the left and right inner sides of the rectangular box 6 .

[0034] Specifically, the notch is used for the exhaust gas to flow along the S-shaped guide channel.

[0035] Furthermore, the upper and lower layers of the S-shaped metal tubes 16 are connected together via a U-shaped connector 14 .

[0036] Specifically, the upper and lower adjacent S-shaped metal tubes 16 can be connected in series through the U-shaped connector 14 .

[0037] Furthermore, the deflection angles of the heat exchanger sheets constituting the strip array heat exchanger sheet 1 17 and the strip array heat exchanger sheet 2 18 are opposite, and the heat exchanger sheets are made of heat conductive material.

[0038] Specifically, the heat exchange fins with opposite deflection angles can increase the residence time of the exhaust gas inside the rectangular box 6 .

[0039] Furthermore, the cylindrical shell 1 is fixed on the upper surface of the rectangular box 6 through the support frame 2.

[0040] Furthermore, a drain pipe 11 is provided on the lower end of the outer side surface of the cylindrical shell 1 away from the steam inlet pipe 13 , and a pressure relief pipe is installed on the cylindrical shell 1 , and a safety valve 10 is installed on the pressure relief pipe.

[0041] Specifically, the condensed water is collected and discharged through the drain pipe 11. If the drain pipe 11 is blocked, the safety valve 10 on the pressure relief pipe will automatically open, thereby ensuring safe production.

[0042] During use: cold water enters the interior of the heat exchange tube 9 through the liquid inlet nozzle 3, and high-temperature steam enters the interior of the cylindrical shell 1 through the steam inlet pipe 13. The water vapor condenses into water droplets on the outer surface of the annular metal plate 12 and dissipates heat. At this time, the cold water flowing through the heat exchange tube 9 absorbs the heat generated by the condensation of the steam, and the condensed water is collected and discharged through the drain pipe 11.

[0043] The high-temperature exhaust gas enters the interior of the rectangular box 6 through the air inlet nozzle 4. While the high-temperature exhaust gas goes up along the S-shaped guide channel between the partition 15 and the inner wall of the rectangular box 6, the high-temperature exhaust gas is fully in contact with the S-shaped metal tube 16 and the strip array heat exchange plate 1 17 and the strip array heat exchange plate 2 18 installed on the outer surface of the S-shaped metal tube 16. The heat of the high-temperature exhaust gas is absorbed by the cold water flowing through the inside of the S-shaped metal tube 16, and the low-temperature exhaust gas is discharged through the air outlet nozzle 7. The circulating water after absorbing heat enters the boiler through the outlet pipe 5.

[0044] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A horizontal economizer for a boiler, characterized in that: Including tail gas waste heat exchanger and steam heat exchanger; The exhaust gas waste heat exchanger comprises a rectangular box (6), the outer side surface of the rectangular box (6) is provided with an air inlet nozzle (4) and an air outlet nozzle (7), the interior of the rectangular box (6) is evenly distributed with a plurality of partitions (15) from top to bottom, the upper surfaces of the partitions (15) are all laid with S-shaped metal tubes (16), the S-shaped metal tubes (16) are connected in series end to end, the lower end of the S-shaped metal tube (16) is connected to a water outlet pipe (5), and the outer side surface of the S-shaped metal tube (16) is provided with a strip array heat exchange plate 1 (17) and a strip array heat exchange plate 2 (18); The steam heat exchanger comprises a cylindrical shell (1), a heat exchange tube (9) is arranged inside the cylindrical shell (1), the left end of the heat exchange tube (9) is connected to a liquid inlet nozzle (3), the right end of the heat exchange tube (9) is connected to the uppermost end of an S-shaped metal tube (16) via a connecting tube (8), an annular metal plate (12) is arranged on the outer side of the heat exchange tube (9), and a steam inlet pipe (13) is arranged on the end of the outer side of the cylindrical shell (1) away from the liquid inlet nozzle (3).

2. A horizontal economizer for a boiler according to claim 1, characterized in that: The air inlet nozzle (4) is arranged on the lower left side of the outer side surface of the rectangular box body (6), and the air outlet nozzle (7) is arranged on the upper right side of the outer side surface of the rectangular box body (6).

3. A horizontal economizer for a boiler according to claim 1, characterized in that: One end of the partition plate (15) is connected to the inner side surface of the rectangular box (6), and a gap is provided between the other end and the inner wall of the rectangular box (6). Adjacent partition plates (15) are respectively mounted on the left and right inner side surfaces of the rectangular box (6).

4. A horizontal economizer for a boiler according to claim 1, characterized in that: The upper and lower layers of S-shaped metal tubes (16) are connected together via a U-shaped connector (14).

5. The horizontal economizer for a boiler according to claim 1, characterized in that: The deflection angles of the heat exchanger sheets constituting the strip array heat exchanger sheet 1 (17) and the strip array heat exchanger sheet 2 (18) are opposite, and the heat exchanger sheets are made of heat conductive material.

6. A horizontal economizer for a boiler according to claim 1, characterized in that: The cylindrical shell (1) is fixed on the upper surface of the rectangular box (6) via a support frame (2).

7. A horizontal economizer for a boiler according to claim 1, characterized in that: A liquid discharge pipe (11) is provided on the lower end of the outer side surface of the cylindrical shell (1) away from the steam inlet pipe (13), and a pressure relief pipe is installed on the cylindrical shell (1), and a safety valve (10) is installed on the pressure relief pipe.

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