Economizer mechanism with ash removal function and waste heat recovery system

Abstract

The utility model relates to the technical field of environmental protection and energy conservation, and discloses an economizer mechanism with an ash removal function and a waste heat recovery system. Each soot blowing device comprises an air cannon, the air cannon is arranged on the flue and located on one side of the heat exchange module of the economizer, the output end of the air cannon extends into the flue and faces the position below the middle of the heat exchange module, the air source communicates with a first pipeline, the first pipeline communicates with the soot blowing devices, and the condensation water main pipe communicates with a second pipeline. According to the plate-type economizer bottom ash removal device, accumulated ash at the bottom of the plate-type economizer can be removed, the equipment blockage risk is reduced, and the risks that the heat exchange efficiency is reduced and the resistance is increased due to the accumulated ash at the bottom are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental protection and energy conservation, in particular to a economizer mechanism with ash cleaning function and a waste heat recovery system. Background Technique

[0002] In response to the national call for energy conservation and emission reduction, as a major energy consumer, the waste heat recovery transformation of coal-fired power plants is being promoted as an important task. Among them, the low-temperature economizer has become the main direction of the waste heat recovery transformation of coal-fired power plants by transferring the heat of low-temperature flue gas to the boiler condensate to save coal consumption.

[0003] At present, most of the low-temperature economizers used in power plants are finned tubes, which increase the heat transfer area compared with smooth tubes, but there are a series of problems such as ash accumulation, corrosion and wear. In recent years, the vacuum heat pipe low-temperature economizer, which is more popular in the market, solves the leakage problem compared with finned tubes, but also has problems such as large floor area and high load. The zero-leakage external wide-channel plate-type low-temperature economizer, as a new technology, has successfully solved a series of its problems and is the optimal solution for the current low-temperature economizer. However, due to the limited layout position of the economizer, it can only be horizontally arranged, and inevitably there is a problem that the ash in the flue gas deposits at the bottom of the economizer. Ordinary steam soot blowing and acoustic soot blowing can only partially solve the problem of ash accumulation on the heat exchange plates, and have little effect on the ash deposited at the bottom. After a long time, the system resistance becomes larger, the heat exchange efficiency decreases, and the system operation is affected. Content of the Utility Model

[0004] The purpose of the utility model is to provide an economizer mechanism with ash cleaning function and a waste heat recovery system, aiming to solve or improve at least one of the above technical problems.

[0005] To achieve the above purpose, the utility model provides the following scheme: The utility model provides an economizer mechanism with ash cleaning function, including:

[0006] A plate-type economizer arranged in the flue;

[0007] An ash cleaning device, including an air cannon, the air cannon is arranged on the flue, the air cannon is located on one side of the heat exchange module of the plate-type economizer, and the output end of the air cannon extends into the flue and faces below the middle of the heat exchange module.

[0008] Optionally, there are two air cannons, which are respectively arranged at both ends of the heat exchange module.

[0009] Optionally, the ash cleaning device further includes a plurality of soot blowers, which are respectively arranged at the inlet end and the outlet end of the plate-type economizer.

[0010] Optionally, it further includes a pressure gauge arranged on the flue.

[0011] Optionally, a deflector is provided at the output end of the air cannon.

[0012] The present utility model further provides a waste heat recovery system, comprising:

[0013] A flue;

[0014] Multiple of the economizer mechanisms with soot cleaning functions as claimed in the claims, and multiple of the plate economizers are connected in parallel and arranged in the flue;

[0015] An air source, which is connected with a first pipeline, and the first pipeline is connected with multiple of the soot blowing devices.

[0016] Optionally, it further comprises a condensate main pipe, which is connected with a second pipeline, and the second pipeline is connected with the water inlets and outlets of multiple of the parallel plate economizers, so as to form a water circulation between the condensate main pipe and multiple of the plate economizers.

[0017] Optionally, a first-stage low-pressure heater and a second-stage low-pressure heater are provided on the second pipeline.

[0018] The present utility model discloses the following technical effects: By extending the output end of the air cannon into the flue and facing the part below the middle of the heat exchange module, the strong air flow of the compressed air suddenly ejected by the air cannon directly rushes into the ash accumulation area at a speed exceeding Mach 1 or higher than the speed of sound. This suddenly released expansion impact force overcomes the static friction of the material, so that the accumulated ash once again flows with the flue gas into the dust collector, realizing the cleaning of the accumulated ash at the bottom of the plate economizer, reducing the risk of equipment blockage, and reducing the risk of reduced heat exchange efficiency and increased resistance caused by the accumulated ash at the bottom. Description of the Drawings

[0019] The drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0020] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0021] Figure 2 is a front view of the inside of the flue of the present utility model;

[0022] Figure 3 is a top view of the inside of the flue of the present utility model.

[0023] In the figure: 1. Economizer; 2. Flue; 3. Air cannon; 4. Soot blower; 5. Air source; 51. First electric valve; 52. Second electric valve; 6. Condensate main pipe; 61. First-stage low-pressure heater; 611. Inlet manual valve; 612. Inlet electric valve; 613. Boost manual valve; 614. Boost pump; 615. Boost electric valve; 616. Spare manual valve; 617. Spare boost pump; 618. Spare electric valve; 62. Second-stage low-pressure heater; 621. Outlet electric valve; 622. Outlet manual valve; 623. Circulation manual valve; 624. Circulation pump; 625. Circulation electric valve. Detailed implementation manners

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0025] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0026] Referring to Figures 1-3 , the present invention provides an economizer mechanism with a soot cleaning function, including:

[0027] A plate-type economizer 1, which is arranged in the flue 2;

[0028] A soot blowing device, including an air cannon 3. The air cannon 3 is arranged on the flue 2. The air cannon 3 is located on one side of the heat exchange module of the plate-type economizer 1, and the output end of the air cannon 3 extends into the flue 2 and faces the middle part below of the heat exchange module.

[0029] By extending the output end of the air cannon 3 into the flue 2 and facing the middle part below of the heat exchange module, the strong air flow of the compressed air suddenly ejected by the air cannon 3 directly rushes into the ash accumulation area at a speed exceeding Mach 1 or higher than the speed of sound. This suddenly released expansion impact force overcomes the static friction of the material, so that the accumulated ash flows into the dust collector with the flue gas again, realizing the cleaning of the accumulated ash at the bottom of the plate-type economizer 1, reducing the risk of equipment blockage, and reducing the risk of reduced heat exchange efficiency and increased resistance caused by the accumulated ash at the bottom.

[0030] As a further optimized solution, there are two air cannons 3, which are respectively arranged at both ends of the heat exchange module to improve the cleaning efficiency of the accumulated ash.

[0031] For a further optimized solution, the soot blower device further includes a plurality of soot blowers 4, which are respectively arranged at the air inlet end and the air outlet end of the plate type economizer 1 and are used for performing conventional steam soot blowing or acoustic soot blowing.

[0032] For a further optimized solution, it further includes a pressure gauge, which is arranged on the flue 2 and is used for observing the pressure difference before and after the flue 2.

[0033] For a further optimized solution, a deflector is arranged at the output end of the air cannon 3 so that the air flow can reach the edge position of the heat exchange module.

[0034] Usage method: By observing the pressure gauge, when the pressure difference before and after the flue 2 is too large, it is judged that there may be ash accumulation. First, use the soot blower 4 to perform conventional steam soot blowing or acoustic soot blowing. If the pressure difference does not decrease significantly after running for a period of time, in combination with the heat exchange situation of the plate type economizer 1, it is judged that there is ash accumulation at the bottom of the plate type economizer 1, and then the air cannon 3 is turned on to clean the ash accumulation at the bottom of the plate type economizer 1.

[0035] The present utility model also provides a waste heat recovery system, including:

[0036] The flue 2;

[0037] A plurality of the above economizer mechanisms with ash cleaning functions, and a plurality of plate type economizers 1 are connected in parallel and arranged in the flue 2;

[0038] An air source 5, which is connected with a first pipeline, and the first pipeline is connected with a plurality of soot blower devices.

[0039] Furthermore, the first pipeline is also connected with a dust collector, and a first electric valve 51 and a second electric valve 52 are also arranged on the first pipeline. The first electric valve 51 is used to control the connection state between the air source 5 and the soot blower device, and the second electric valve 52 is used to control the connection state between the first pipeline and the dust collector.

[0040] For a further optimized solution, it further includes a condensate main pipe 6, which is connected with a second pipeline, and the second pipeline is connected with the water inlets and outlets of a plurality of plate type economizers 1 connected in parallel, so that a water circulation is formed between the condensate main pipe 6 and a plurality of plate type economizers 1. A first-stage low-pressure heater 61 and a second-stage low-pressure heater 62 are arranged on the second pipeline. The first-stage low-pressure heater 61 is connected with the inlet end of the plate type economizer 1, the second-stage low-pressure heater 62 is connected with the outlet end position of the plate type economizer 1, and the first-stage low-pressure heater 61 is connected with the second-stage low-pressure heater 62.

[0041] Furthermore, an inlet manual valve 611 and an inlet electric valve 612 are provided between the first-stage low-pressure heater 61 and the inlet end of the plate economizer 1. A pressurizing manual valve 613, a pressurizing pump 614, a pressurizing electric valve 615, a spare manual valve 616, a spare pressurizing pump 617, and a spare electric valve 618 are provided between the inlet electric valve 612 and the inlet end of the plate economizer 1. The pressurizing manual valve 613, the pressurizing pump 614, the pressurizing electric valve 615, the spare manual valve 616, the spare pressurizing pump 617, and the spare electric valve 618 are in parallel. An outlet electric valve 621 and an outlet manual valve 622 are provided between the second-stage low-pressure heater 62 and the outlet end of the plate economizer 1. A circulation manual valve 623, a circulation pump 624, and a circulation electric valve 625 are provided between the outlet electric valve 621 and the inlet electric valve 612.

[0042] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0043] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A coal economizer mechanism with a ash cleaning function, characterized in that: include: A plate-type economizer (1) is arranged in a flue (2); A sootblowing device comprises an air cannon (3), wherein the air cannon (3) is arranged on a flue (2), the air cannon (3) is located on one side of a heat exchange module of the plate economizer (1), and an output end of the air cannon (3) extends into the flue (2) toward below the middle of the heat exchange module.

2. The economizer mechanism with ash cleaning function according to claim 1, characterized in that: There are two air cannons (3), which are respectively arranged at two ends of the heat exchange module.

3. The economizer mechanism with ash cleaning function according to claim 1, characterized in that: The sootblowing device further comprises a plurality of sootblowers (4), which are respectively arranged at the air inlet end and the air outlet end of the plate economizer (1).

4. The economizer mechanism with ash cleaning function according to claim 1, characterized in that: It also comprises a pressure gauge, which is arranged on the flue (2).

5. The economizer mechanism with ash cleaning function according to claim 1, characterized in that: The output end of the air cannon (3) is provided with a guide plate.

6. A waste heat recovery system, characterized in that: include: Flue (2); An economizer mechanism with a ash cleaning function as described in multiple claims 1 to 5, wherein multiple plate economizers (1) are connected in parallel and arranged in the flue (2); The air source (5) is connected to a first pipeline, and the first pipeline is connected to the plurality of soot blowing devices.

7. A waste heat recovery system according to claim 6, characterized in that: It also includes a condensate main pipe (6) connected to a second pipeline, and the second pipeline is connected to the water inlet and outlet of the plurality of plate economizers (1) connected in parallel, so that a water circulation is formed between the condensate main pipe (6) and the plurality of plate economizers (1).

8. A waste heat recovery system according to claim 7, characterized in that: The second pipeline is provided with a first-stage low-pressure heater (61) and a second-stage low-pressure heater (62).

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