A high temperature heat exchanger

Abstract

The utility model discloses a high temperature heat exchanger, including the heat exchange pipe row of a plurality of pieces of interval and parallel arrangement, import header and export header, each heat exchange pipe row is by a plurality of roads independent parallel serpentine pipe constitutes, all serpentine pipe's import all with import header intercommunication, serpentine pipe's export all with export header intercommunication, be provided with the row -to-row anti -collision limiting component between every adjacent two heat exchange pipe rows, be provided with the pipe -to-pipe anti -collision limiting component between every adjacent two pipe sections in every heat exchange pipe row. The utility model has the advantages of both can guarantee the free expansion space required by pipe thermal expansion and cold shrink, and can effectively avoid the contact collision between adjacent pipe row and between adjacent pipes.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange equipment technology, specifically to a high-temperature heat exchanger that can be applied to thermal power plants. Background Technology

[0002] High-temperature heat exchangers are key equipment in thermal power plants, mainly consisting of multiple parallel serpentine heat exchange tubes and inlet and outlet headers connecting the tubes. They are typically located in flue gas ducts where the flue gas temperature exceeds 450°C. During operation, high-temperature flue gas passes through the outside of the serpentine heat exchange tubes, while saturated steam flows inside. The high-temperature flue gas heats the saturated steam flowing inside the tubes, transforming it into superheated steam. Therefore, the performance of the high-temperature heat exchanger directly affects the energy efficiency of the power plant.

[0003] To enhance heat transfer, serpentine heat exchanger tubes are typically arranged very compactly, with tube spacing usually ranging from 30 to 60 millimeters. However, this compact arrangement faces severe challenges under long-term high-temperature operation. On the one hand, the heat exchanger tubes are prone to significant thermal expansion at high temperatures, which may lead to bending and deformation. On the other hand, the heat exchanger tubes are also susceptible to vibration and deformation due to the scouring effect of high-speed flue gas. Deformed heat exchanger tubes are prone to collisions and friction with adjacent tubes, resulting in tube breakage and ultimately leakage failure. This not only reduces the heat exchange efficiency of the high-temperature heat exchanger but also increases equipment maintenance costs, and in severe cases, may affect the normal operation of the entire thermal power plant. Utility Model Content

[0004] The purpose of this invention is to provide a high-temperature heat exchanger that can ensure the free expansion and contraction space required for the thermal expansion and contraction of the tubes, while effectively preventing contact and collision between adjacent tube rows and between adjacent tubes.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a high-temperature heat exchanger, comprising several heat exchange tube banks arranged at intervals, an inlet header, and an outlet header. Each heat exchange tube bank is composed of several independent parallel serpentine tubes, the inlets of all serpentine tubes are connected to the inlet header, and the outlets of all serpentine tubes are connected to the outlet header; an inter-bank anti-collision limiting component is provided between each pair of adjacent heat exchange tube banks, and an inter-tube anti-collision limiting component is provided between each pair of adjacent tube segments in each heat exchange tube bank; The inter-pipe anti-collision limiting component includes an arc-shaped plate and a limiting pin. The arc-shaped plate has mounting portions extending outward from both ends along its length. The arc-shaped plate is fixed to one of the two adjacent pipe segments through the mounting portions at both ends, with its arc opening facing the fixed pipe segment. An elongated hole is provided on the arc-shaped plate. The radial dimension of the limiting pin is smaller than the width of the elongated hole. One end of the limiting pin is fixed to the other pipe segment of the two adjacent pipe segments, and the other end of the limiting pin moves through the elongated hole of the arc-shaped plate and is provided with a limiting head. The radial dimension of the limiting head is larger than the width of the elongated hole.

[0006] Furthermore, in the aforementioned high-temperature heat exchanger, the limiting head and the limiting pin are integrally formed.

[0007] Furthermore, in the aforementioned high-temperature heat exchanger, the arc-shaped plate is made of a high-temperature resistant and elastic metal material.

[0008] Furthermore, in the aforementioned high-temperature heat exchanger, the inter-row anti-collision limiting component includes a T-shaped limiting block and a limiting seat. One end of the limiting seat is fixed to a corresponding pipe section of one of the two adjacent heat exchange tube rows, and the other end of the limiting seat has a T-shaped groove extending through the limiting seat along the length of the pipe section. The end of the T-shaped limiting block away from the T-shaped head is fixed to a corresponding pipe section of the other heat exchange tube row of the two adjacent heat exchange tube rows. The T-shaped head of the T-shaped limiting block is slidably embedded in the T-shaped groove of the limiting seat, and an expansion gap is left between the T-shaped head of the T-shaped limiting block and the groove wall of the T-shaped groove.

[0009] Furthermore, in the aforementioned high-temperature heat exchanger, the outer wall of the T-shaped limiting block, the groove wall of the T-shaped groove of the limiting seat, the outer wall of the arc plate, and the outer wall of the limiting pin are all coated with a high-temperature resistant and wear-resistant coating.

[0010] Furthermore, in the aforementioned high-temperature heat exchanger, the serpentine tube is a bare tube.

[0011] The beneficial effects of implementing the above technical solution are as follows: (1) By setting up a dual limiting structure of “inter-row anti-collision limiting component” and “inter-pipe anti-collision limiting component”, the problem of collision and friction between tube rows and tube sections caused by thermal expansion and flue gas scouring vibration of high temperature heat exchangers is fundamentally solved, greatly reducing the risk of heat exchange tube damage and leakage, and improving the stability and reliability of the equipment in long-term operation under harsh conditions.

[0012] (2) The T-shaped limiting block and T-shaped groove in the inter-row anti-collision limiting assembly, as well as the limiting pin and elongated hole in the inter-pipe anti-collision limiting assembly, are reserved with movable gaps that allow the heat exchange tubes to expand and contract freely in the design direction when heated, thus avoiding thermal stress concentration; at the same time, the relative displacement of adjacent pipe sections or adjacent pipe rows is limited to a safe range to prevent excessive deformation from causing collision friction.

[0013] (3) In the inter-pipe anti-collision limiting component, the limiting pin passes through the long strip hole on the arc plate. The cooperation between the arc plate and the pin has better fault tolerance. The movement of the pin in the long hole is not a single linear direction. The arc structure provides a more flexible swing space for the pin on another pipe segment, so that it can adapt to the relative position change within a certain angle, while still playing a limiting role. It is not only suitable for effective anti-collision limiting of two parallel adjacent pipe segments in the serpentine pipe, but also suitable for effective anti-collision limiting of two non-parallel adjacent pipe segments in the serpentine pipe. It has a wide range of applications.

[0014] (4) The arc plate, limiting pin, T-shaped limiting block and limiting seat that constitute the anti-collision limiting component are all independent mechanical parts with simple structure. They can all be directly fixed on the existing heat exchange tubes without complicated modification of the main structure of the heat exchange tube row, and are easy to apply and implement on existing equipment.

[0015] (5) Both the “inter-row anti-collision limit assembly” and the “inter-pipe anti-collision limit assembly” are coated with a high-temperature and wear-resistant coating to ensure the durability and effectiveness of the limit assembly in a high-temperature flue gas environment.

[0016] (6) The serpentine tube adopts a smooth tube, which has the advantages of less ash accumulation and low manufacturing cost. Combined with the anti-collision structure, it improves the overall performance and economy of the high temperature heat exchanger from the aspects of anti-wear and anti-ash accumulation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a high-temperature heat exchanger according to the present invention.

[0018] Figure 2 This is a schematic diagram showing the connection relationship between a single heat exchanger tube bank, inlet header, and outlet header.

[0019] Figure 3 This is a schematic diagram of a structure with an inter-row anti-collision limit component installed between two heat exchanger tube rows.

[0020] Figure 4 for Figure 3 A three-dimensional image.

[0021] Figure 5 This is an exploded view of the inter-row anti-collision limit component.

[0022] Figure 6This is a schematic diagram of a structure when an inter-pipe anti-collision limiting component is installed between two adjacent pipe sections.

[0023] Figure 7 This is an exploded view of the inter-pipe anti-collision limit component. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1 , Figure 2 As shown, a high-temperature heat exchanger includes several heat exchange tube arrays 1 arranged at intervals, an inlet header 2, and an outlet header 3. Each heat exchange tube array 1 is composed of several independent parallel serpentine tubes 4. The inlets of all serpentine tubes 4 are connected to the inlet header 2, and the outlets of all serpentine tubes 4 are connected to the outlet header 3. The serpentine tubes 4 are bare tubes, which helps to reduce ash accumulation and lower manufacturing costs.

[0026] An inter-row anti-collision limiting component 5 is provided between each pair of adjacent heat exchanger tubes 1, and an inter-tube anti-collision limiting component 6 is provided between each pair of adjacent tube segments 100 in each heat exchanger tube 1. like Figure 6 , Figure 7 As shown, the inter-pipe anti-collision limiting component 6 includes an arc-shaped plate 61 and a limiting pin 62. The arc-shaped plate is made of a high-temperature resistant and elastic metal material. The arc-shaped plate 61 has mounting portions 611 extending outwards from both ends along its length. The arc-shaped plate 61 is fixed to one of the two adjacent pipe segments 100 via the mounting portions 611 at both ends, with its arc-shaped opening facing the fixed pipe segment 100. An elongated hole is provided on the arc-shaped plate 61. 612; The radial dimension of the limiting pin 62 is smaller than the width of the elongated hole 612. One end of the limiting pin 62 is fixed to another pipe segment 100 of the two adjacent pipe segments 100. The other end of the limiting pin 62 moves through the elongated hole 612 of the arc plate 61 and is provided with a limiting head 621. The radial dimension of the limiting head 621 is larger than the width of the elongated hole 612. In this embodiment, the limiting head 621 and the limiting pin 62 are integrally formed.

[0027] In this embodiment, as Figure 3 , Figure 4 , Figure 5As shown, the inter-row anti-collision limiting component 5 includes a T-shaped limiting block 51 and a limiting seat 52. One end of the limiting seat 52 is fixed to the corresponding pipe segment 100 of one of the two adjacent heat exchange tube rows. The other end of the limiting seat 52 has a T-shaped groove 521 that runs through the limiting seat 52 along the length of the pipe segment. The end of the T-shaped limiting block 51 away from the T-shaped head 511 is fixed to the corresponding pipe segment 100 of the other heat exchange tube row of the two adjacent heat exchange tube rows. The T-shaped head 511 of the T-shaped limiting block 51 is slidably embedded in the T-shaped groove 521 of the limiting seat 52. There is a telescopic gap between the T-shaped head 511 of the T-shaped limiting block 51 and the wall of the T-shaped groove.

[0028] In this embodiment, the outer wall of the T-shaped limiting block 51, the groove wall of the T-shaped groove 521 of the limiting seat 52, the outer wall of the arc plate 61, and the outer wall of the limiting pin 62 are all coated with a high-temperature and wear-resistant coating. The high-temperature and wear-resistant coating can ensure the durability and effectiveness of the limiting component in a high-temperature flue gas environment.

[0029] The advantages of this utility model are: (1) By setting up a dual limiting structure of “inter-row anti-collision limiting component” and “inter-pipe anti-collision limiting component”, the problem of collision and friction between tube rows and tube sections caused by thermal expansion and flue gas scouring vibration of high temperature heat exchangers is fundamentally solved, greatly reducing the risk of heat exchange tube damage and leakage, and improving the stability and reliability of the equipment in long-term operation under harsh conditions.

[0030] (2) The T-shaped limiting block and T-shaped groove in the inter-row anti-collision limiting assembly, as well as the limiting pin and elongated hole in the inter-pipe anti-collision limiting assembly, are reserved with movable gaps that allow the heat exchange tubes to expand and contract freely in the design direction when heated, thus avoiding thermal stress concentration; at the same time, the relative displacement of adjacent pipe sections or adjacent pipe rows is limited to a safe range to prevent excessive deformation from causing collision friction.

[0031] (3) In the inter-pipe anti-collision limiting component, the limiting pin passes through the long strip hole on the arc plate. The cooperation between the arc plate and the pin has better fault tolerance. The movement of the pin in the long hole is not a single linear direction. The arc structure provides a more flexible swing space for the pin on another pipe segment, so that it can adapt to the relative position change within a certain angle, while still playing a limiting role. It is not only suitable for effective anti-collision limiting of two parallel adjacent pipe segments in the serpentine pipe, but also suitable for effective anti-collision limiting of two non-parallel adjacent pipe segments in the serpentine pipe. It has a wide range of applications.

[0032] (4) The arc plate, limiting pin, T-shaped limiting block and limiting seat that constitute the anti-collision limiting component are all independent mechanical parts with simple structure. They can all be directly fixed on the existing heat exchange tubes without complicated modification of the main structure of the heat exchange tube row, and are easy to apply and implement on existing equipment.

[0033] (5) Both the “inter-row anti-collision limit assembly” and the “inter-pipe anti-collision limit assembly” are coated with a high-temperature and wear-resistant coating to ensure the durability and effectiveness of the limit assembly in a high-temperature flue gas environment.

[0034] (6) The serpentine tube adopts a smooth tube, which has the advantages of less ash accumulation and low manufacturing cost. Combined with the anti-collision structure, it improves the overall performance and economy of the high temperature heat exchanger from the aspects of anti-wear and anti-ash accumulation.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any modifications or equivalent changes made based on the technical essence of the present utility model shall still fall within the scope of protection claimed by the present utility model.

Claims

1. A high-temperature heat exchanger, characterized in that: It includes several heat exchange tube banks arranged side by side at intervals, an inlet header and an outlet header. Each heat exchange tube bank is composed of several independent parallel serpentine tubes. The inlets of all serpentine tubes are connected to the inlet header, and the outlets of all serpentine tubes are connected to the outlet header. An inter-row anti-collision limiting component is provided between each pair of adjacent heat exchange tube banks, and an inter-tube anti-collision limiting component is provided between each pair of adjacent tube segments in each heat exchange tube bank. The inter-pipe anti-collision limiting component includes an arc-shaped plate and a limiting pin. The arc-shaped plate has mounting portions extending outward from both ends along its length. The arc-shaped plate is fixed to one of the two adjacent pipe segments through the mounting portions at both ends, with its arc opening facing the fixed pipe segment. An elongated hole is provided on the arc-shaped plate. The radial dimension of the limiting pin is smaller than the width of the elongated hole. One end of the limiting pin is fixed to the other pipe segment of the two adjacent pipe segments, and the other end of the limiting pin moves through the elongated hole of the arc-shaped plate and is provided with a limiting head. The radial dimension of the limiting head is larger than the width of the elongated hole.

2. The high-temperature heat exchanger according to claim 1, characterized in that: The limiting head and the limiting pin are integrally formed.

3. A high-temperature heat exchanger according to claim 1, characterized in that: The curved plate is made of a high-temperature resistant and elastic metal material.

4. A high-temperature heat exchanger according to claim 1, 2, or 3, characterized in that: The inter-row anti-collision limiting component includes a T-shaped limiting block and a limiting seat. One end of the limiting seat is fixed to the corresponding pipe section of one of the two adjacent heat exchanger tube banks. The other end of the limiting seat has a T-shaped groove that runs through the limiting seat along the length of the pipe section. The end of the T-shaped limiting block away from the T-shaped head is fixed to the corresponding pipe section of the other heat exchanger tube bank of the two adjacent heat exchanger tube banks. The T-shaped head of the T-shaped limiting block is slidably embedded in the T-shaped groove of the limiting seat. An expansion gap is left between the T-shaped head of the T-shaped limiting block and the groove wall of the T-shaped groove.

5. A high-temperature heat exchanger according to claim 4, characterized in that: The outer wall of the T-shaped limiting block, the groove wall of the T-shaped groove of the limiting seat, the outer wall of the arc plate, and the outer wall of the limiting pin are all coated with a high-temperature and wear-resistant coating.

6. A high-temperature heat exchanger according to claim 1, characterized in that: The serpentine tube is a light tube.

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