Built-in flue of plate heat exchanger for recovering flue gas waste heat of gas turbine

Abstract

The utility model discloses a built-in flue of a plate heat exchanger for recovering flue gas waste heat of a gas turbine, which comprises a flue gas inlet, the flue gas inlet is arranged at the top of a heat exchanger plate, a flue gas outlet is arranged at the bottom of the heat exchanger plate, a flue gas inlet pipe is arranged at the end of the flue gas inlet, and the flue gas inlet pipe is fixedly arranged on an end plate of a plate heat exchanger body; a flue is arranged on the surface of the heat exchanger plate, and a deceleration strip is fixedly arranged on the upper portion of the flue. According to the plate heat exchanger for flue gas waste heat recovery of the gas turbine, the flue is arranged in the plate heat exchanger, and after flue gas is decelerated twice in the flue, the residence time of the flue gas in the flue can be prolonged; and the residence time is prolonged, so that the smoke has more time to exchange heat with the sheet bars of the heat exchanger and the medium on the other side, and the heat can be more sufficiently transferred to the heated medium from the smoke, thereby improving the heat exchange efficiency of the heat exchanger, more effectively recovering the waste heat in the smoke and being beneficial to improving the energy utilization rate of the whole system.

Description

Technical Field

[0001] This utility model relates to the field of plate heat exchangers, specifically to a plate heat exchanger with an internal flue for waste heat recovery from gas turbine flue gas. Background Technology

[0002] Plate heat exchangers are installed on the exhaust pipes of gas turbines, allowing flue gas to pass through one side of the heat exchanger and transfer heat to flowing water in the other side, thus raising the water temperature. The heated water can then be used as heating circulating water for urban central heating, factory workshops, or building heating systems. For example, the Huaneng Beijing Thermal Power Plant's flue gas waste heat utilization project uses "flue gas-water plate heat exchanger + heat pump technology" to recover heat from the waste heat generated by the gas turbine combustion, heating the heating circulating water to assist in heating the plant area or city.

[0003] Regarding patents concerning the recovery of high-temperature flue gas waste heat using plate heat exchangers, a search revealed a sintering flue gas waste heat recovery device with publication number CN206001924U. The device includes a plate heat exchanger installed inside a sintering flue gas duct, with a bypass flue on the other side and a valve on the bypass flue. The plate heat exchanger provides hot water to heating users, ORC power generation units, or refrigeration units. The plate heat exchanger has an inlet pipe and an outlet pipe, with a bypass pipe between them. The outlet pipe is sequentially connected to a pre-reserved ORC power generation unit circulation loop and a heating user circulation loop, and then flows through the inlet pipe to the plate heat exchanger.

[0004] Although the above-mentioned device can achieve the purpose of recovering waste heat from flue gas, in actual use, the flue gas velocity in the built-in flue of the plate heat exchanger is too fast, and the contact time between the flue gas and the plates and the heat exchange medium on the other side is too short. The heat does not have enough time to be fully transferred before it flows out of the plate channel, resulting in insufficient heat exchange and reduced heat exchange efficiency of the plate heat exchanger, making it impossible to effectively recover waste heat from the flue gas. Utility Model Content

[0005] The purpose of this utility model is to provide a plate heat exchanger with an internal flue for waste heat recovery from gas turbine flue gas, so as to solve the defects mentioned in the background art.

[0006] To achieve the above objectives, a plate heat exchanger for waste heat recovery from gas turbine flue gas is provided, comprising an inlet located at the top of the heat exchanger plates, an outlet located at the bottom of the heat exchanger plates, a flue gas inlet pipe at the end of the inlet, and a flue gas inlet pipe fixedly mounted on the end plate of the plate heat exchanger body; a flue is formed on the surface of the heat exchanger plates, a speed bump is fixedly mounted on the upper part of the flue, a narrow speed bump is fixedly mounted on the bottom of the speed bump, and a wide speed bump is fixedly mounted on the bottom of the narrow speed bump; a sealing strip is fixedly mounted on the surface of the heat exchanger plates, and a flue outlet is formed at the bottom of the flue near the outlet.

[0007] Preferably, the sealing strip includes an upper isolation strip, a lower isolation strip, and a sealing seat. The sealing seat is configured as two sets, which are respectively fixed at the upper and lower ends of the heat exchanger plate, and the flue is located between the upper and lower isolation strips.

[0008] Preferably, the speed bumps are configured as multiple sets evenly distributed at the bottom of the smoke inlet, and the speed bumps are configured in a "C" shape.

[0009] Preferably, multiple sets of narrow deceleration channels are evenly arranged inside the flue. The narrow deceleration channel includes an upper isolation strip and a lower isolation strip, and a flow groove is formed between the upper isolation strip and the lower isolation strip; the flow groove is inclined upward.

[0010] Preferably, both the upper and lower isolation strips are S-shaped, and both the upper and lower isolation strips have flue gas inlets at their ends.

[0011] Preferably, the smoke inlet includes a mounting base, a positioning groove, a positioning column, a smoke filter box, and a filter sheet. The mounting base is fixedly provided on the inner circumference of the smoke inlet, and the smoke filter box is provided inside the mounting base.

[0012] Preferably, five sets of positioning grooves are evenly provided on the inner circumference of the mounting base, and five sets of positioning posts are evenly fixed on the outer circumference of the tobacco filter box. The positioning posts are adapted to the size of the positioning grooves, and the five sets of positioning posts are respectively inserted into the five sets of positioning grooves and fixed by bolts; a filter sheet is fixedly provided at the bottom of the tobacco filter box.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. This utility model increases the residence time of flue gas inside the flue by decelerating it twice inside the flue. The extended residence time allows the flue gas more time to exchange heat with the heat exchanger plates and the medium on the other side. Heat can be transferred more fully from the flue gas to the heated medium, thereby improving the heat exchanger's heat exchange efficiency, more effectively recovering waste heat from the flue gas, and helping to improve the energy utilization rate of the entire system.

[0015] 2. In this utility model, flue gas typically contains impurities such as dust and particles. The flue gas filter box can effectively intercept these impurities, preventing them from entering the plate heat exchanger body, avoiding blockage of the channels between the plates, ensuring that the flue gas can flow smoothly within the heat exchanger, and maintaining the normal operation of the equipment. Filtering out solid particles in the flue gas can reduce the scouring and wear of particles on the internal plates, pipes, and other components of the heat exchanger. Especially for high-speed flowing flue gas, the scouring of particles may cause gradual wear on the surface materials of the equipment. The flue gas filter box can significantly reduce this wear and extend the service life of the equipment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the plate heat exchanger body.

[0018] Figure 2 This is a front view schematic diagram of the structure of this utility model;

[0019] Figure 3 for Figure 1 A bottom view;

[0020] Figure 4 for Figure 1 A sectional view;

[0021] Figure 5 This is a schematic diagram of the smoke inlet and its connection structure.

[0022] Figure 6 for Figure 5 Rear view.

[0023] The annotations in the attached figures are explained as follows:

[0024] 1. Plate heat exchanger body; 2. Flue gas inlet pipe; 3. Heat exchanger plates; 31. Flue gas inlet; 311. Mounting base; 312. Positioning groove; 313. Positioning column; 314. Flue gas filter box; 315. Filter plate; 32. Sealing strip; 321. Upper isolation strip; 322. Lower isolation strip; 323. Sealing seat; 33. Flue; 331. Speed ​​bump; 34. Narrow speed reduction channel; 341. Upper isolation strip; 342. Lower isolation strip; 343. Flow groove; 35. Wide speed reduction channel; 36. Flue gas outlet; 37. Flue gas outlet. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] Please see Figure 1-6This utility model provides a built-in flue for a plate heat exchanger for waste heat recovery from gas turbine flue gas, including a flue inlet 31, which is located at the top of the heat exchanger plate 3, and a flue outlet 37 at the bottom of the heat exchanger plate 3. A flue gas inlet pipe 2 is provided at the end of the flue inlet 31 and is fixedly installed on the end plate of the plate heat exchanger body 1. A flue 33 is provided on the surface of the heat exchanger plate 3, and a speed reduction belt 331 is fixedly provided on the upper part of the flue 33. A narrow speed reduction channel 34 is fixedly provided at the bottom of the speed reduction belt 331, and a wide speed reduction channel 35 is provided at the bottom of the narrow speed reduction channel 34. A sealing strip 32 is fixedly provided on the surface of the heat exchanger plate 3, and a flue outlet 36 is provided at the bottom of the flue 33 near the flue outlet 37.

[0030] Working Principle: In actual use, the flue gas inside the exhaust pipe of the gas turbine enters the plate heat exchanger body 1 through the flue gas inlet pipe 2 on one side of the plate heat exchanger. The heat from the flue gas is transferred to the water flowing in the other side of the channel, causing the water to heat up. The heated water can be used as circulating heating water to assist in heating in the plant or city, achieving the purpose of recovering waste heat from the gas turbine flue gas. When the flue gas flows on the heat exchanger plates 3, specifically: the flue gas enters the interior of the flue duct 33 through the inlet 31. A speed bump 331 is installed above the flue duct 33. The speed bump 331 serves to initially decelerate the flue gas on the heat exchanger plates 3. Simultaneously, when the flue gas crosses the speed bump 331, it enters a narrow deceleration channel. The flow channel 343 inside the duct 34 is inclined upwards, causing the flue gas to move upwards. Simultaneously, the upper isolation strips 341 and lower isolation strips 342 on both sides of the flow channel 343 are S-shaped, increasing the volume of the flow channel 343. Multiple sets of narrow deceleration channels 34 are combined to form a second deceleration effect on the flue gas on the heat exchanger plates 3. After two decelerations inside the flue duct 33, the residence time of the flue gas inside the flue duct 33 is increased. The extended residence time allows the flue gas more time to exchange heat with the heat exchanger plates and the medium on the other side. Heat can be more fully transferred from the flue gas to the heated medium, thereby improving the heat exchanger's heat exchange efficiency and more effectively recovering waste heat from the flue gas, contributing to improved overall system efficiency. The system improves energy utilization; the two-stage deceleration makes the flow of flue gas within the heat exchanger more uniform and stable, facilitating more precise control of the outlet temperature of the flue gas and the heated medium, meeting the stringent temperature requirements of different processes, and improving product quality or process stability; a flue gas filter box 314 is installed inside the flue gas inlet 31. The filter box 314 performs preliminary filtration of the flue gas entering the plate heat exchanger body 1. Flue gas typically contains dust, particles, and other impurities, which the filter box 314 effectively intercepts, preventing them from entering the plate heat exchanger body, avoiding blockage of the channels between the plates, ensuring smooth flow of flue gas within the heat exchanger, and maintaining normal equipment operation; filtering out solid particles in the flue gas reduces the impact of particles on the internal plates, pipes, and other components of the heat exchanger. Abrasive wear, especially for high-speed flue gas, can cause gradual wear on the surface materials of equipment due to the scouring of particles. The flue gas filter box 314 can significantly reduce this wear and extend the service life of the equipment. Some impurities in the flue gas may combine with water vapor to form corrosive substances. The flue gas filter box 314 can intercept these impurities, reducing the contact between corrosive substances and internal components of the heat exchanger, thereby reducing the risk of equipment corrosion and protecting the structural integrity of the equipment. The installation method of the flue gas filter box 314 is as follows: The flue gas filter box 314 needs to be installed on the first heat exchanger plate 3 near the flue gas inlet pipe 2. Hold the flue gas filter box 314, and insert the five sets of positioning posts 313 on the outside of the flue gas filter box 314 into the five sets of positioning slots 312 respectively, and fix them with bolts.

[0031] In a preferred embodiment, the sealing strip 32 includes an upper isolation strip 321, a lower isolation strip 322, and a sealing seat 323. The sealing seat 323 is configured as two sets, which are respectively fixed at the upper and lower ends of the heat exchanger plate 3. The flue 33 is disposed between the upper isolation strip 321 and the lower isolation strip 322.

[0032] As a preferred embodiment, the speed bumps 331 are configured in multiple groups evenly distributed at the bottom of the smoke inlet 31, and the speed bumps 331 are configured in a "C" shape.

[0033] Multiple sets of narrow deceleration channels 34 are evenly arranged inside the flue 33. The narrow deceleration channel 34 includes an upper isolation strip 341 and a lower isolation strip 342, and a flow groove 343 is formed between the upper isolation strip 341 and the lower isolation strip 342. The flow groove 343 is inclined upward.

[0034] As a preferred embodiment, both the upper isolation strip 341 and the lower isolation strip 342 are arranged in an "S" shape, and both the upper isolation strip 341 and the lower isolation strip 342 have flue gas communication ports at their ends.

[0035] The smoke inlet 31 includes a mounting base 311, a positioning groove 312, a positioning post 313, a smoke filter box 314, and a filter sheet 315. The mounting base 311 is fixedly installed on the inner circumference of the smoke inlet 31, and the smoke filter box 314 is installed inside the mounting base 311.

[0036] In a preferred embodiment, five sets of positioning grooves 312 are evenly provided on the inner circumference of the mounting base 311, and five sets of positioning posts 313 are evenly fixed on the outer circumference of the tobacco filter box 314. The positioning posts 313 are adapted to the size of the positioning grooves 312, and the five sets of positioning posts 313 are respectively inserted into the five sets of positioning grooves 312 and fixed by bolts; a filter sheet 315 is fixedly provided at the bottom of the tobacco filter box 314.

[0037] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A plate heat exchanger with built-in flue for waste heat recovery from gas turbine flue gas, comprising a flue gas inlet (31), characterized in that: The flue gas inlet (31) is located at the top of the heat exchanger plate (3), and the flue gas outlet (37) is located at the bottom of the heat exchanger plate (3). A flue gas inlet pipe (2) is provided at the end of the flue gas inlet (31), and the flue gas inlet pipe (2) is fixedly installed on the end plate of the plate heat exchanger body (1). A flue (33) is provided on the surface of the heat exchanger plate (3), and a speed reduction belt (331) is fixedly installed on the upper part of the flue (33). A narrow speed reduction channel (34) is fixedly installed at the bottom of the speed reduction belt (331), and a wide speed reduction channel (35) is provided at the bottom of the narrow speed reduction channel (34). A sealing strip (32) is fixedly installed on the surface of the heat exchanger plate (3), and a flue gas outlet (36) is provided at the bottom of the flue (33) near the flue gas outlet (37).

2. The plate heat exchanger with built-in flue for waste heat recovery from gas turbine flue gas as described in claim 1, characterized in that: The sealing strip (32) includes an upper isolation strip (321), a lower isolation strip (322) and a sealing seat (323). The sealing seat (323) is configured as two sets, which are respectively fixed at the upper and lower ends of the heat exchanger plate (3). The flue (33) is located between the upper isolation strip (321) and the lower isolation strip (322).

3. The plate heat exchanger with built-in flue for waste heat recovery from gas turbine flue gas as described in claim 1, characterized in that: The speed bumps (331) are configured in multiple groups evenly distributed at the bottom of the smoke inlet (31), and the speed bumps (331) are configured in a "C" shape.

4. The plate heat exchanger with built-in flue for waste heat recovery from gas turbine flue gas as described in claim 1, characterized in that: The narrow deceleration channel (34) is evenly arranged in multiple sets inside the flue (33). The narrow deceleration channel (34) includes an upper isolation strip (341) and a lower isolation strip (342). A flow groove (343) is formed between the upper isolation strip (341) and the lower isolation strip (342). The flow groove (343) is inclined upward.

5. The plate heat exchanger with built-in flue for waste heat recovery from gas turbine flue gas as described in claim 4, characterized in that: Both the upper isolation strip (341) and the lower isolation strip (342) are S-shaped, and both the upper isolation strip (341) and the lower isolation strip (342) have flue gas connection ports at their ends.

6. The plate heat exchanger with built-in flue for waste heat recovery from gas turbine flue gas as described in claim 1, characterized in that: The smoke inlet (31) includes a mounting base (311), a positioning groove (312), a positioning column (313), a smoke filter box (314), and a filter sheet (315). The mounting base (311) is fixedly installed on the inner circumference of the smoke inlet (31), and the smoke filter box (314) is installed inside the mounting base (311).

7. The plate heat exchanger with built-in flue for waste heat recovery from gas turbine flue gas as described in claim 6, characterized in that: The mounting base (311) has five sets of positioning grooves (312) evenly distributed on its inner circumference. The filter box (314) has five sets of positioning posts (313) evenly fixed on its outer circumference. The positioning posts (313) are matched with the dimensions of the positioning grooves (312). The five sets of positioning posts (313) are respectively inserted into the five sets of positioning grooves (312) and fixed with bolts. The bottom of the filter box (314) is fixedly provided with filter sheets (315).

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