Boiler heat exchange system

Abstract

The utility model belongs to the technical field of boiler heat exchange, and relates to a boiler heat exchange system which comprises a boiler body, an air pre-heater, a main air path assembly and an auxiliary air path assembly. The main air path assembly comprises a main air inlet channel and a preheated air conveying channel. The main air inlet channel is communicated with an air inlet of the air pre-heater; the inlet end of the preheated air conveying channel communicates with an air outlet of the air pre-heater, and the outlet end of the preheated air conveying channel communicates with the boiler body. The inlet end of the auxiliary air path assembly communicates with the main air inlet channel, and the outlet end of the auxiliary air path assembly communicates with the preheated air conveying channel. By means of the auxiliary air path assembly, when the air pre-heater breaks down or needs to be maintained, air in the main air inlet channel directly enters the preheated air conveying channel through the auxiliary air path assembly and then enters the boiler body through the preheated air conveying channel, and it is guaranteed that the air flow in the boiler body is always sufficient; and normal combustion and stable operation of the boiler are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler heat exchange, in particular to a boiler heat exchange system. Background Art

[0002] As energy utilization and environmental protection gain increasing attention, boilers, as indispensable equipment in industrial production and heating systems, are becoming a focus of industry attention in terms of energy efficiency and emission control. As a key component of internal energy conversion, the boiler heat exchange system directly impacts the boiler's overall operating efficiency and environmental performance.

[0003] There is some prior art research on boiler heat exchange systems. Patent document No. 202310844694.6 discloses a boiler flue gas system with adjustable heat exchange capacity, comprising a boiler, a first cold air duct, a second cold air duct, a first flue gas duct, and a second flue gas duct. The first cold air duct connects a first air preheater and a coal mill. The first air preheater heats the primary cold air in the first cold air duct and feeds it into the coal mill. The second cold air duct connects a second air preheater and a boiler. The second air preheater heats the secondary cold air in the second cold air duct and feeds it into the boiler. The first flue gas duct connects the boiler and the first air preheater, and a first flue gas flow control valve is provided on the first flue gas duct. The second flue gas duct connects the boiler and the second air preheater, and a second flue gas flow control valve is provided on the second flue gas duct.

[0004] However, when the second air preheater fails or needs to be shut down for maintenance, the secondary cold air in the second cold air duct cannot be effectively supplied to the boiler, resulting in insufficient air flow inside the furnace, affecting the normal combustion and stable operation of the boiler. Utility Model Content

[0005] In order to solve the technical problem in the background technology that the secondary cold air in the second cold air pipeline cannot be effectively supplied to the boiler when the second air preheater fails or needs to be shut down for maintenance, the utility model provides a boiler heat exchange system.

[0006] The utility model discloses a boiler heat exchange system, which is provided with a secondary air duct assembly. When the air preheater fails or requires maintenance, the air in the main air inlet duct directly enters the preheating air delivery channel through the secondary air duct assembly, and then enters the boiler body through the preheating air delivery channel, thereby ensuring that the air flow in the boiler body is always sufficient, thereby ensuring the normal combustion and stable operation of the boiler.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A boiler heat exchange system comprises: a boiler body, an air preheater, a main air duct assembly and a secondary air duct assembly; the main air duct assembly comprises a main air inlet channel and a preheated air delivery channel; the main air inlet channel is connected to the air inlet of the air preheater; the inlet end of the preheated air delivery channel is connected to the air outlet of the air preheater, and the outlet end of the preheated air delivery channel is connected to the boiler body; the inlet end of the secondary air duct assembly is connected to the main air inlet channel, and the outlet end of the secondary air duct assembly is connected to the preheated air delivery channel.

[0009] In a specific feasible implementation scheme, the auxiliary air duct assembly includes an auxiliary air inlet channel and a first adjusting member; the inlet end of the auxiliary air inlet channel is connected to the main air inlet channel, and the outlet end of the auxiliary air inlet channel is connected to the preheated air delivery channel; the first adjusting member is installed on the auxiliary air inlet channel for adjusting the connection state between the main air inlet channel and the auxiliary air inlet channel.

[0010] In a specific possible implementation manner, the first regulating member includes at least one first valve; and at least one first valve is installed on the secondary air inlet channel.

[0011] In a specific feasible embodiment, the boiler heat exchange system also includes a main smoke exhaust channel assembly, and the main smoke exhaust channel assembly includes a first smoke exhaust channel and a second smoke exhaust channel; the inlet end of the first smoke exhaust channel is connected to the smoke exhaust port of the boiler body, and the outlet end of the first smoke exhaust channel is connected to the flue gas inlet of the air preheater; the inlet end of the second smoke exhaust channel is connected to the flue gas outlet of the air preheater, and the smoke is discharged from the outlet end of the second smoke exhaust channel.

[0012] In a specific feasible implementation scheme, the boiler heat exchange system also includes a secondary smoke exhaust channel assembly, and the secondary smoke exhaust channel assembly includes a secondary smoke exhaust channel and a second adjusting member; the inlet end of the secondary smoke exhaust channel is connected to the first smoke exhaust channel, and the outlet end of the secondary smoke exhaust channel is connected to the second smoke exhaust channel; the second adjusting member is installed on the secondary smoke exhaust channel, and is used to adjust the connection state between the first smoke exhaust channel and the secondary smoke exhaust channel.

[0013] In a specific embodiment, the second regulating member includes at least one second valve; and the at least one second valve is installed on the secondary smoke exhaust channel.

[0014] In a specific possible implementation scheme, the preheated air delivery channel is connected to a first air volume regulating valve.

[0015] In a specific possible implementation scheme, a second air volume regulating valve is connected to the secondary air inlet channel.

[0016] In a specific embodiment, the outer periphery of the preheated air delivery channel is wrapped with a thermal insulation layer.

[0017] In a specific embodiment, the boiler heat exchange system further includes a dust removal component; the outlet end of the second smoke exhaust channel is connected to the inlet end of the dust removal component.

[0018] In summary, the present invention has the following beneficial technical effects:

[0019] 1. The utility model provides a boiler heat exchange system with a secondary air duct assembly, so that when the air preheater fails or requires maintenance, the air in the main air inlet duct directly enters the preheated air delivery channel through the secondary air duct assembly, and then enters the boiler body through the preheated air delivery channel, ensuring that the air flow in the boiler body is always sufficient, ensuring normal combustion and stable operation of the boiler.

[0020] 2. The utility model provides a boiler heat exchange system with an auxiliary smoke exhaust channel component, so that when the air preheater fails or needs maintenance, the flue gas in the first smoke exhaust channel can directly enter the second smoke exhaust channel through the auxiliary smoke exhaust channel, ensuring that the flue gas in the boiler heat exchange system is discharged smoothly, avoiding the shutdown of the boiler body or safety accidents caused by poor smoke exhaust, and improving the overall reliability of the boiler heat exchange system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the boiler heat exchange system of the present utility model.

[0022] Explanation of the accompanying drawings: 1. Boiler body; 2. Air preheater; 3. Main air duct assembly; 31. Main air inlet channel; 32. Preheated air delivery channel; 33. Air supply source; 4. Main smoke exhaust channel assembly; 41. First smoke exhaust channel; 42. Second smoke exhaust channel; 5. Auxiliary air duct assembly; 51. Auxiliary air inlet channel; 52. First adjusting member; 6. Auxiliary smoke exhaust channel assembly; 61. Auxiliary smoke exhaust channel; 62. Second adjusting member. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be further explained below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0024] Reference Figure 1A boiler heat exchange system includes: a boiler body 1, an air preheater 2, a main air duct assembly 3, a main exhaust duct assembly 4, and an auxiliary air duct assembly 5. The main air duct assembly 3 includes a main air inlet duct 31 and a preheated air delivery duct 32. The main air inlet duct 31 delivers air to the air preheater 2 for preheating, and the preheated air delivery duct 32 delivers the preheated air from the air preheater 2 to the boiler body 1; the main exhaust duct assembly 4 includes a first exhaust duct 41 and a second exhaust duct 42. The first exhaust duct 41 delivers the flue gas generated by the combustion of the boiler body 1 to the air preheater 2 for heat exchange, and the second exhaust duct 42 discharges the flue gas after heat exchange; the inlet end of the auxiliary air duct assembly 5 is connected to the main air inlet duct 31, and the outlet end of the auxiliary air duct assembly 5 is connected to the preheated air delivery duct 32. The auxiliary air duct assembly 5 is activated when the air preheater 2 fails or is under maintenance, and directly delivers air to the boiler body 1 to ensure the continuous operation of the boiler.

[0025] Specifically, the main air duct assembly 3 further includes an air supply source 33, which is connected to the inlet end of the main air inlet channel 31 and is used to provide air to the main air inlet channel 31. The air supply source 33 can be a blower, a fan, etc.; in the present invention, the air supply source 33 is a blower.

[0026] Reference Figure 1 The main air inlet channel 31 is connected to the air inlet of the air preheater 2; the inlet end of the preheated air delivery channel 32 is connected to the air outlet of the air preheater 2, and the outlet end of the preheated air delivery channel 32 is connected to the boiler body 1.

[0027] Reference Figure 1 The auxiliary air duct assembly 5 includes an auxiliary air inlet channel 51 and a first adjustment member 52. The inlet end of the auxiliary air inlet channel 51 is connected to the air supply source 33 or the main air inlet channel 31, and the outlet end of the auxiliary air inlet channel 51 is connected to the preheated air delivery channel 32. The first adjustment member 52 is installed on the auxiliary air inlet channel 51 and is used to adjust the connection state between the main air inlet channel 31 and the auxiliary air inlet channel 51. Specifically, the auxiliary air duct assembly 5 is adjusted to a closed state when the air preheater 2 is operating normally, and is adjusted to an open state when the air preheater 2 fails or is under maintenance.

[0028] In the present invention, the auxiliary air inlet channel 51 is a DN350 pipe. The inlet end of the DN350 pipe is connected to the main air inlet channel 31 through a flange, and the outlet end is connected to the preheated air delivery channel 32 through a flange.

[0029] Reference Figure 1 The first regulating member 52 includes at least one first valve; the at least one first valve is installed on the auxiliary air inlet channel 51.

[0030] In the present invention, the number of first valves can be one, two, or three. Multiple first valves are sequentially arranged along the flow direction of air in the auxiliary air inlet channel 51. Providing an appropriate number of first valves ensures that the state of the auxiliary air duct assembly 5 can be flexibly and reliably switched when the air preheater 2 fails or undergoes maintenance. Any of these arrangements is acceptable. In the present invention, the number of first valves is one, and one first valve is installed at the inlet end of the auxiliary air inlet channel 51.

[0031] Reference Figure 1 The inlet end of the first smoke exhaust channel 41 is connected to the smoke exhaust port of the boiler body 1, and the outlet end of the first smoke exhaust channel 41 is connected to the flue gas inlet of the air preheater 2; the inlet end of the second smoke exhaust channel 42 is connected to the flue gas outlet of the air preheater 2, and the flue gas is discharged from the outlet end of the second smoke exhaust channel 42.

[0032] In the present invention, the outlet end of the first smoke exhaust channel 41 is communicated with the smoke inlet of the air preheater 2 through a flange, and the inlet end of the second smoke exhaust channel 42 is communicated with the smoke outlet of the air preheater 2 through a flange.

[0033] Example 1:

[0034] Reference Figure 1 The boiler heat exchange system of this embodiment further includes a secondary exhaust channel assembly 6, which is used to provide a backup exhaust path when the main exhaust channel assembly 4 fails. The secondary exhaust channel assembly 6 includes a secondary exhaust channel 61 and a second adjustment member 62. The inlet end of the secondary exhaust channel 61 is connected to the first exhaust channel 41, and the outlet end of the secondary exhaust channel 61 is connected to the second exhaust channel 42; the second adjustment member 62 is installed on the secondary exhaust channel 61 and is used to adjust the connection state between the first exhaust channel 41 and the secondary exhaust channel 61. Specifically, when the air preheater 2 is operating normally, the secondary exhaust channel 61 is adjusted to a closed state, and when the air preheater 2 fails or is undergoing maintenance, the secondary exhaust channel 61 is adjusted to an open state.

[0035] Specifically, the second regulating member 62 can be an electric valve, a pneumatic valve, or a manual valve. By providing the second regulating member 62, if a failure occurs in the primary exhaust channel assembly 4, the secondary exhaust channel assembly 6 can be quickly switched to ensure continuous operation of the boiler heat exchange system and smooth exhaust. Any of these configurations is acceptable. In this embodiment, the second regulating member 62 is a manual valve.

[0036] In this embodiment, the auxiliary smoke exhaust channel assembly 6 is provided so that when the air preheater 2 fails or requires maintenance, the flue gas in the first smoke exhaust channel 41 can directly pass through the auxiliary smoke exhaust channel 61 to the second smoke exhaust channel 42, ensuring that the flue gas in the boiler heat exchange system is discharged smoothly, avoiding shutdown of the boiler body 1 or safety accidents caused by poor smoke exhaust, and improving the overall reliability of the boiler heat exchange system.

[0037] Example 2:

[0038] Reference Figure 1 On the basis of embodiment 1, the second regulating member 62 includes at least one second valve. The at least one second valve is installed on the secondary smoke exhaust channel 61 .

[0039] Specifically, the number of second valves can be one, two, or three. Multiple second valves are sequentially arranged along the flow direction of the smoke in the secondary smoke exhaust channel 61. Providing an appropriate number of second valves ensures that the state of the secondary smoke exhaust channel 61 can be quickly and accurately switched when needed. All of these arrangements are acceptable. In this embodiment, the number of second valves is one, and one second valve is installed at the inlet end of the secondary smoke exhaust channel 61.

[0040] Example 3:

[0041] Reference Figure 1 In the boiler heat exchange system of this embodiment, the preheated air delivery channel 32 is connected to a first air volume regulating valve.

[0042] In this embodiment, the first air volume regulating valve is provided to facilitate accurate adjustment of the air flow in the preheated air delivery channel 32 , ensuring that the amount of preheated air entering the boiler body 1 is appropriate, thereby improving the combustion efficiency and thermal efficiency of the boiler body 1 .

[0043] Example 4:

[0044] Reference Figure 1 In the boiler heat exchange system of this embodiment, a second air volume regulating valve is connected to the auxiliary air inlet channel 51.

[0045] In this embodiment, a second air volume regulating valve is provided to facilitate precise adjustment of the air flow in the auxiliary air inlet channel 51. According to the actual operation requirements of the boiler or the failure of the air preheater 2, the amount of air supplied to the boiler body 1 is adjusted in a timely manner to ensure that the boiler body 1 can obtain a stable air supply under various operating conditions.

[0046] Example 5:

[0047] Reference Figure 1 In the boiler heat exchange system of this embodiment, the outer periphery of the preheated air delivery channel 32 is wrapped with an insulation layer.

[0048] Specifically, the insulation layer can be rock wool insulation material, silicate insulation material, or polyurethane foam insulation material. The insulation layer is provided to reduce heat loss during the transportation of preheated air. Any of these configurations is acceptable. In this embodiment, the insulation layer is rock wool insulation material.

[0049] In this embodiment, the provided insulation layer enables the preheated air to maintain a relatively high temperature before entering the boiler body 1, thereby improving the combustion efficiency and thermal efficiency of the boiler.

[0050] Example 6:

[0051] Reference Figure 1 The boiler heat exchange system of this embodiment further includes a dust removal component. The outlet end of the second smoke exhaust channel 42 is connected to the inlet end of the dust removal component.

[0052] Specifically, the dust removal component is an existing commercially available flue gas dust removal device, which is used to remove or reduce the fly ash content in the flue gas discharged from the second flue gas exhaust channel 42.

[0053] The working principle of a boiler heat exchange system of the present invention is as follows: when the air preheater 2 is in normal working condition, first, the air supply source 33 provides air to the main air inlet channel 31, and the air is transported to the air preheater 2 through the main air inlet channel 31 for preheating; in the air preheater 2, the air exchanges heat with the hot flue gas generated by the combustion of the boiler body 1, and becomes preheated air after absorbing the heat of the flue gas; the preheated air is then transported to the boiler body 1 through the preheating air delivery channel 32, providing the necessary hot air for the combustion process of the boiler; at the same time, the flue gas generated by the combustion of the boiler body 1 is transported to the air preheater 2 through the first flue gas exhaust channel 41, exchanges heat with the air entering the air preheater 2, and the flue gas after heat exchange is discharged through the second flue gas exhaust channel 42.

[0054] When the air preheater 2 fails or requires maintenance, the auxiliary air duct assembly 5 is switched to the open state, and the air in the main air inlet channel 31 directly enters the preheated air delivery channel 32 through the auxiliary air duct assembly 5, and then enters the boiler body 1 through the preheated air delivery channel 32, ensuring that the boiler body 1 continues to operate during the failure of the air preheater 2 and maintains the continuity and stability of production. At the same time, the flue gas in the first smoke exhaust channel 41 directly enters the second smoke exhaust channel 42 through the auxiliary smoke exhaust channel 61, ensuring that the smoke in the boiler heat exchange system is smoothly discharged.

[0055] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A boiler heat exchange system, characterized in that: include: Boiler body (1), air preheater (2), main air duct assembly (3) and auxiliary air duct assembly (5); The main air duct assembly (3) includes a main air inlet channel (31) and a preheated air delivery channel (32); The main air inlet channel (31) is in communication with the air inlet of the air preheater (2); The inlet end of the preheated air delivery channel (32) is in communication with the air outlet of the air preheater (2), and the outlet end of the preheated air delivery channel (32) is in communication with the boiler body (1); The inlet end of the auxiliary air duct assembly (5) is in communication with the main air inlet channel (31), and the outlet end of the auxiliary air duct assembly (5) is in communication with the preheated air delivery channel (32).

2. The boiler heat exchange system according to claim 1, characterized in that: The auxiliary air duct assembly (5) comprises an auxiliary air inlet channel (51) and a first adjusting member (52); The inlet end of the auxiliary air inlet channel (51) is in communication with the main air inlet channel (31), and the outlet end of the auxiliary air inlet channel (51) is in communication with the preheated air delivery channel (32); The first adjusting member (52) is installed on the auxiliary air inlet channel (51) and is used to adjust the communication state between the main air inlet channel (31) and the auxiliary air inlet channel (51).

3. The boiler heat exchange system according to claim 2, characterized in that: The first regulating member (52) includes at least one first valve; At least one of the first valves is installed on the secondary air inlet channel (51).

4. The boiler heat exchange system according to claim 2 or 3, characterized in that: The boiler heat exchange system further comprises a main smoke exhaust channel assembly (4), wherein the main smoke exhaust channel assembly (4) comprises a first smoke exhaust channel (41) and a second smoke exhaust channel (42); The inlet end of the first smoke exhaust channel (41) is communicated with the smoke exhaust port of the boiler body (1), and the outlet end of the first smoke exhaust channel (41) is communicated with the smoke inlet of the air preheater (2); The inlet end of the second smoke exhaust channel (42) is communicated with the smoke outlet of the air preheater (2), and the smoke is discharged from the outlet end of the second smoke exhaust channel (42).

5. The boiler heat exchange system according to claim 4, characterized in that: The boiler heat exchange system further comprises a secondary smoke exhaust channel assembly (6), wherein the secondary smoke exhaust channel assembly (6) comprises a secondary smoke exhaust channel (61) and a second regulating member (62); The inlet end of the secondary smoke exhaust channel (61) is in communication with the first smoke exhaust channel (41), and the outlet end of the secondary smoke exhaust channel (61) is in communication with the second smoke exhaust channel (42); The second adjusting member (62) is installed on the auxiliary smoke exhaust channel (61) and is used to adjust the communication state between the first smoke exhaust channel (41) and the auxiliary smoke exhaust channel (61).

6. The boiler heat exchange system according to claim 5, characterized in that: The second regulating member (62) includes at least one second valve; At least one of the second valves is installed on the secondary smoke exhaust channel (61).

7. The boiler heat exchange system according to claim 6, characterized in that: The preheated air delivery channel (32) is connected to a first air volume regulating valve.

8. The boiler heat exchange system according to claim 7, characterized in that: The auxiliary air inlet channel (51) is connected to a second air volume regulating valve.

9. The boiler heat exchange system according to claim 8, characterized in that: The outer periphery of the preheated air delivery channel (32) is wrapped with a heat-insulating layer.

10. The boiler heat exchange system according to claim 5, characterized in that: The boiler heat exchange system also includes a dust removal component; The outlet end of the second smoke exhaust channel (42) is communicated with the inlet end of the dust removal component.

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