A dust removal device and boiler system

Abstract

This invention discloses a dust removal device and boiler system. It primarily utilizes a leak monitoring device installed at the bottom of the inner wall of the diffuser tube to promptly detect leaks in the low-temperature economizer, solving the problem of undetected leaks and preventing ash buildup from the leaking fluid that could affect the normal operation of the unit. The main technical solution of this invention is as follows: a dust removal device, comprising: a dust removal device body and a diffuser tube, the first end of which is connected to the low-temperature economizer, and the second end of which is connected to the dust removal device body; a leak monitoring device, disposed on the inner wall of the diffuser tube, which contacts the leaking fluid to generate a leak detection signal. This invention is mainly used for leak detection in low-temperature economizers.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, and in particular to a dust removal device and boiler system. Background Technology

[0002] In the boiler system, the low-temperature economizer is located on the horizontal flue before the dust collector. The economizer uses a flue gas-water heat exchanger, where the heat recovered from the flue gas heats the condensate drawn from the low-pressure heater. The condensate flows through the economizer's heat exchange tubes and exchanges heat with the flue gas in the flue through the H-shaped fins on the tubes. Because the heat exchange tubes operate in a rapidly flowing flue gas environment, and the flue gas contains particulate impurities that collide with the tubes over a long period, varying degrees of wear, corrosion, and even leakage can occur. If a leak occurs in the low-temperature economizer and is not detected and isolated in time, it will cause ash buildup in the flue and electrostatic precipitator hopper, severely affecting the normal operation of the unit.

[0003] In existing technologies, flue gas humidity meters are often installed in the flue of low-temperature economizers. These meters typically use capacitive flue gas humidity meters to detect the moisture content in the flue gas. However, due to the high flue gas velocity in the flue, particulate impurities in the flue gas pass through the flue gas humidity meter at high speed, causing the meter to wear easily and resulting in decreased accuracy. Furthermore, the flue gas humidity meter can only detect when the humidity of the flue gas reaches a certain value. However, in the early stages of a leak in a low-temperature economizer, or when the leak is small, there will be no significant increase in flue gas humidity, making it impossible to detect the leak in a timely and accurate manner. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a dust removal device and a boiler system, which mainly detects leaks in the low-temperature economizer in a timely manner by setting a leak monitoring device at the bottom of the inner wall of the diffuser tube and directly contacting the leaking fluid, thus solving the problem of leaks not being detected in time and preventing the leaked fluid from causing ash buildup and affecting the normal operation of the unit.

[0005] On one hand, the present invention provides a dust removal device for dust removal and leak detection of flue gas from a low-temperature economizer (200). The dust removal device includes:

[0006] The dust removal equipment body and the diffuser tube (100) are provided. The first end of the diffuser tube (100) is used to connect to the low temperature economizer (200), and the second end of the diffuser tube (100) is connected to the dust removal equipment body.

[0007] Leakage detection device (300) is disposed on the inner wall of diffuser (100) and is used to contact the leaking fluid to generate a leak detection signal.

[0008] The leakage monitoring device (300) is installed on the inner wall of the bottom end of the diffuser (100);

[0009] The leakage monitoring device (300) includes a probe assembly (310), an insulating plate (320), a power supply (330), and an alarm (340). The first end of the probe assembly (310) is connected to the diffuser (100), and the first end of the probe assembly (310) is insulated from the inner wall of the diffuser (100). The insulating plate (320) is laid on the inner wall of the diffuser (100). The second end of the probe assembly (310) is connected to the insulating plate (320). The probe assembly (310) is made of conductive material.

[0010] The first end of the power supply (330) is electrically connected to the probe assembly (310), the second end of the power supply (330) is electrically connected to the first end of the alarm (340), and the second end of the alarm (340) is electrically connected to the diffuser (100).

[0011] The probe assembly (310) is used to contact the leaking fluid, and the alarm (340) is used to generate a leak detection signal.

[0012] The probe assembly (310) includes a probe fixing rod (311), a leak detection probe (312), and an insulating head (313);

[0013] The probe fixing rod (311) is a cylindrical rod structure. Both the probe fixing rod (311) and the leak detection probe (312) are made of conductive material. One end of the leak detection probe (312) is connected to the probe fixing rod (311), and the other end of the leak detection probe (312) extends toward the insulating plate (320) and is connected to the insulating plate (320).

[0014] There are two insulating heads (313). The probe fixing rod (311) is connected to the diffuser tube (100) at both ends. The insulating head (313) is located between the end of the probe fixing rod (311) and the diffuser tube (100). The insulating head (313) is used to insulate the probe fixing rod (311) from the diffuser tube (100).

[0015] Among them, there are multiple leak detection probes (312), which are arranged in parallel on the probe fixing rod (311).

[0016] The leak detection probe (312) extends vertically downwards.

[0017] The diffuser tube (100) includes a bottom wall (110), which is inclined downward in a direction away from the low-temperature economizer (200), and an insulating plate (320) is laid on the bottom wall (110).

[0018] Among them, the insulating plate (320) is laid on the bottom wall (110) near the first end of the diffuser tube (100);

[0019] Alternatively, the edge of the insulating plate (320) coincides with the first end edge of the diffuser tube (100).

[0020] The diffuser tube (100) also includes a top wall (120) and two side walls (130). The top wall (120), side walls (130) and bottom wall (110) form a cylindrical structure of the diffuser tube (100). The bottom wall (110) is located at the bottom and the top wall (120) is located at the top. The top wall (120) is inclined upward in the direction away from the low-temperature economizer (200). The side walls (130) are located on both sides and gradually move away from each other in the direction away from the low-temperature economizer (200). The probe assembly (310) is connected to the side walls.

[0021] The sidewall of the diffuser tube (100) is conical.

[0022] On the other hand, the present invention also provides a boiler system, including the aforementioned dust removal equipment, as well as a low-temperature economizer (200) and a boiler;

[0023] The low-temperature economizer (200) includes a flue (210) and a heat exchanger (220). The flue (210) is horizontally arranged. One end of the flue (210) is connected to the boiler outlet, and the other end is connected to the first end of the diffuser (100). The heat exchanger (220) is located in the flue (210). The flue gas discharged from the boiler outlet passes through the flue (210) and exchanges heat with the heat exchanger (220) before flowing to the diffuser (100). The heat exchanger (220) is used to circulate heat exchange fluid.

[0024] This invention discloses a dust removal device and boiler system. By installing a leakage monitoring device at the bottom of the diffuser tube's inner wall, leakage in the low-temperature economizer can be detected in a timely manner, solving the problem of untimely leakage detection and preventing leaked fluid from causing ash buildup and affecting the normal operation of the unit. In the prior art, a flue gas humidity meter is often installed in the flue of the low-temperature economizer. Due to the high flue gas velocity in the flue, the flue gas humidity meter is prone to wear, leading to a decrease in accuracy. Moreover, the flue gas humidity meter can only detect leaks when the humidity of the flue gas reaches a certain value, resulting in the inability to detect leaks in a timely and accurate manner. Compared with the prior art, this application proposes a leakage monitoring device at the bottom of the diffuser tube's sidewall. When a leak occurs in the low-temperature economizer, the leaking fluid will flow through the bottom wall of the low-temperature economizer flue to the diffuser tube connected to the low-temperature economizer, and then flow to the dust removal device body at the bottom of the diffuser tube's sidewall. The leakage monitoring device, located at the bottom of the diffuser tube's sidewall, will be in direct contact with the leaking fluid, achieving accurate and timely detection and avoiding the problem of untimely and inaccurate detection of low-temperature economizer leaks. Attached Figure Description

[0025] Figure 1This is a partial structural schematic diagram of the dust removal equipment provided in an embodiment of the present invention from a first-view perspective;

[0026] Figure 2 for Figure 1 A partial structural schematic diagram of the dust removal equipment shown.

[0027] Figure 3 This is a partial structural cross-sectional view of the dust removal equipment provided in an embodiment of the present invention from a second perspective;

[0028] Figure 4 This is a partial structural diagram of a boiler system provided in an embodiment of the present invention;

[0029] Figure 5 This is a partial cross-sectional structural diagram of a boiler system provided in an embodiment of the present invention. Detailed Implementation

[0030] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description of the specific implementation, structure, features and effects of the dust removal equipment proposed according to the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0031] On the one hand, such as Figure 1-3 As shown, the present invention provides a dust removal device for dust removal and leak detection of flue gas from a low-temperature economizer (200). The dust removal device includes:

[0032] The dust removal equipment body and the diffuser tube (100) are provided. The first end of the diffuser tube (100) is used to connect to the low temperature economizer (200), and the second end of the diffuser tube (100) is connected to the dust removal equipment body.

[0033] Leakage monitoring device (300) is disposed on the inner wall of the diffuser (100) and located at the bottom end of the side wall of the diffuser (100). The leakage monitoring device (300) is used to contact the leaking fluid to generate a leak detection signal.

[0034] The diffuser tube (100) is a hollow, approximately cylindrical structure. The first end of the diffuser tube (100) has a first end opening, through which it connects to the low-temperature economizer (200). The second end of the diffuser tube (100) has a second end opening, through which it connects to the dust removal equipment body. The first and second end openings can have various shapes, such as both being square or both being circular. In one embodiment, both the first and second end openings are rectangular openings, and their centers are on the same horizontal axis. The area of ​​the second end opening is larger than the area of ​​the first end opening. The vertical cross-section of the diffuser (100) gradually increases from the first end to the second end. The sidewall of the diffuser (100) is conical. The diffuser (100) has the purpose of increasing the flue gas flow area and reducing the flue gas flow velocity, so that the flue gas flowing out of the flue can slow down and better contact the electrostatic precipitator in the dust removal equipment body, making the dust removal more effective. The leakage monitoring device (300) is installed inside the diffuser (100) and connected to the inner wall of the diffuser (100). Since the leakage fluid from the low-temperature economizer (200) will drip onto the bottom end of the flue of the low-temperature economizer (200), and then flow to the diffuser (100) under the push of the flue gas, the fluid will flow along the bottom end of the inner wall of the diffuser (100). Therefore, placing the leak detection device (300) on the inner wall of the bottom end of the diffuser (100) allows the leak detection device (300) to directly contact the leaking fluid, making the detection more accurate. Furthermore, since the flow velocity of the flue gas decreases significantly after entering the diffuser (100), the velocity of particulate matter in the flue gas decreases, thereby reducing damage to the leak detection device (300) and ensuring its effective operation without the need for frequent replacements.

[0035] This invention discloses a dust removal device and boiler system. By installing a leakage monitoring device at the bottom of the diffuser tube's inner wall, leakage in the low-temperature economizer can be detected in a timely manner, solving the problem of untimely leakage detection and preventing leaked fluid from causing ash buildup and affecting the normal operation of the unit. In the prior art, a flue gas humidity meter is often installed in the flue of the low-temperature economizer. Due to the high flue gas velocity in the flue, the flue gas humidity meter is prone to wear, leading to a decrease in accuracy. Moreover, the flue gas humidity meter can only detect leaks when the humidity of the flue gas reaches a certain value, resulting in the inability to detect leaks in a timely and accurate manner. Compared with the prior art, this application proposes a leakage monitoring device at the bottom of the diffuser tube's sidewall. When a leak occurs in the low-temperature economizer, the leaking fluid will flow through the bottom wall of the low-temperature economizer flue to the diffuser tube connected to the low-temperature economizer, and then flow to the dust removal device body at the bottom of the diffuser tube's sidewall. The leakage monitoring device, located at the bottom of the diffuser tube's sidewall, will be in direct contact with the leaking fluid, achieving accurate and timely detection and avoiding the problem of untimely and inaccurate detection of low-temperature economizer leaks.

[0036] The leak detection device (300) can be various instruments, such as a flue gas hygrometer. Since the flue gas flow rate through the diffuser (100) is slow, it can prevent the flue gas hygrometer from being damaged or malfunctioning. Alternatively, in one embodiment, the leak detection device (300) includes a probe assembly (310), an insulating plate (320), a power supply (330), and an alarm (340). The first end of the probe assembly (310) is connected to the diffuser (100) and is insulated from the inner wall of the diffuser (100). The insulating plate (320) is laid on the inner wall of the diffuser (100). The second end of the probe assembly (310) is connected to the insulating plate (320). The probe assembly (310) is made of conductive material. The first end of the power supply (330) is electrically connected to the probe assembly (310), and the second end of the power supply (330) is electrically connected to the first end of the alarm (340). The second end of the alarm (340) is electrically connected to the diffuser (100).

[0037] The probe assembly (310) is fixed to the diffuser tube (100), and its bottom end extends toward and connects to the insulating plate (320). Specifically, the probe assembly (310) can abut against the insulating plate (320) or be inserted into the insulating plate (320), but the bottom end of the probe assembly (310) does not contact the diffuser tube (100). The insulating plate (320) can be a thin rubber sheet or a plastic sheet, and the insulating plate (320) covers a certain area of ​​the bottom of the inner wall of the diffuser tube (100), such as at least covering the area that may flow through the diffuser tube (100) after a fluid leak. The first end of the power supply (330) is electrically connected to the probe assembly (310) through a wire, and the second end of the alarm (340) is electrically connected to the diffuser tube (100) through a wire. The wire can be screwed to the inner wall of the diffuser tube (100) using screws. When there is no fluid leakage, due to the insulating barrier effect of the insulating plate (320), the power supply (330) and the alarm (340) cannot form a circuit, and the alarm (340) is not powered on and does not alarm. When there is a fluid leakage, the fluid will flow into the diffuser (100) from the horizontal flue. When it flows on the inner wall of the diffuser (100), it will flow through the insulating plate (320). The fluid layer formed on the insulating plate (320) will connect the inner wall of the diffuser (100) and the probe assembly (310). Since the diffuser (100) is made of metal and the leaking fluid layer is conductive, a circuit consisting of the power supply (330), the alarm (340), the diffuser (100), and the probe assembly (310) will be formed, so that the alarm (340) is powered on and activated. The alarm (340) can be an audible and visual alarm, a buzzer alarm, etc., and the leak detection signal is an audible and visual signal.

[0038] In one embodiment, the probe assembly (310) includes a probe fixing rod (311), a leak detection probe (312), and an insulating head (313). The probe fixing rod (311) is a cylindrical rod structure. Both the probe fixing rod (311) and the leak detection probe (312) are made of conductive material. One end of the leak detection probe (312) is connected to the probe fixing rod (311), and the other end of the leak detection probe (312) extends toward the insulating plate (320) and is connected to the insulating plate (320). There are two insulating heads (313). The probe fixing rod (311) is connected to the diffuser (100) at both ends. The insulating heads (313) are located between the end of the probe fixing rod (311) and the diffuser (100). The insulating heads (313) are used to insulate the probe fixing rod (311) from the diffuser (100).

[0039] The probe fixing rod (311) is horizontally positioned and connected to the side walls on both sides of the diffuser tube (100). In one embodiment, there are multiple leak detection probes (312), which are arranged in parallel on the probe fixing rod (311). The multiple leak detection probes (312) are evenly distributed along the length of the probe fixing rod (311). The top end of the leak detection probe (312) is connected to the probe fixing rod (311), and the bottom end extends to the insulating plate (320). The arrangement of multiple leak detection probes (312) makes the detection range wider. When the diffuser tube (100) is tilted, or due to the unevenness of the inner wall of the diffuser tube (100), the fluid will flow along one side of the bottom surface of the diffuser tube (100). The multiple leak detection probes (312) are arranged between the horizontal sides of the diffuser tube (100), so that even when the leakage amount is small or the leakage fluid flow range is close to the side walls, leaks can still be effectively detected. The insulating head (313) can be a rubber head, which is sleeved on both ends of the probe fixing rod (311) so that the probe fixing rod (311) is insulated from the diffuser tube (100).

[0040] In one embodiment, the leak detection probe (312) extends vertically downward. Since the sidewall of the diffuser tube (100) is usually inclined, and the insulating plate (320) covering the inner wall of the diffuser tube (100) is also inclined, the leak detection probe (312) extends vertically downward and forms an acute angle with the insulating plate (320), so that the fluid can better contact the leak detection probe (312) and the detection is more sensitive.

[0041] In one implementation, such as Figure 1 As shown, the diffuser tube (100) includes a bottom wall (110) that is inclined downwards in a direction away from the low-temperature economizer (200), and an insulating plate (320) is laid on the bottom wall (110). The diffuser tube (100) also includes a top wall (120) and two side walls (130). The top wall (120), side walls (130) and bottom wall (110) form a cylindrical structure of the diffuser tube (100). The bottom wall (110) is located at the bottom, and the top wall (120) is located at the top. The top wall (120) is inclined upwards in a direction away from the low-temperature economizer (200), and the side walls (130) are located on both sides. The side walls (130) gradually move away from each other in a direction away from the low-temperature economizer (200), and the probe assembly (310) is connected to the side walls.

[0042] The top wall (120), two side walls (130), and bottom wall (110) form a square pyramidal surface, which is the side wall of the diffuser (100). The top wall (120), two side walls (130), and bottom wall (110) also form a first end opening and a second end opening. The area of ​​the second end opening is larger than that of the first end opening. The bottom wall (110) slopes downward, so that the fluid in the flue of the low-temperature economizer (200) flows down the bottom wall (110) of the diffuser (100) and does not accumulate in the bottom wall (110) and flue, so that the leakage monitoring device (300) can contact the fluid in time to trigger an alarm. The two ends of the probe fixing rod (311) are connected to the two side walls (130).

[0043] In one embodiment, the insulating plate (320) is laid on the bottom wall (110) near the first end of the diffuser tube (100). Alternatively, the edge of the insulating plate (320) coincides with the edge of the first end of the diffuser tube (100).

[0044] The center of the insulating plate (320) can be located at one-third of the distance from the edge of the first end opening to the edge of the second end opening of the diffuser tube (100), so that the edge of the insulating plate (320) near the first end opening is closer to the first end opening, so that the leak detection probe (312) can come into contact with the leaking fluid earlier, detect the leak in time, and avoid the fluid adhering to dust and impurities, causing it to stick to the inner wall of the diffuser tube (100).

[0045] In addition, the sidewall of the diffuser tube (100) can also be a conical surface, with the insulating plate (320) laid on the inner wall of the conical surface and located at the bottom end and extending within one-third of the circumferential range.

[0046] On the other hand, such as Figure 4-5 As shown, the present invention also provides a boiler system, including the aforementioned dust removal equipment, as well as a low-temperature economizer (200) and a boiler;

[0047] The low-temperature economizer (200) includes a flue (210) and a heat exchanger (220). The flue (210) is horizontally arranged. One end of the flue (210) is connected to the boiler outlet, and the other end is connected to the first end of the diffuser (100). The heat exchanger (220) is located in the flue (210). The flue gas discharged from the boiler outlet passes through the flue (210) and exchanges heat with the heat exchanger (220) before flowing to the diffuser (100). The heat exchanger (220) is used to circulate heat exchange fluid.

[0048] The other end of the flue (210) is connected to the first end opening of the diffuser (100). The flue (210) has a horizontal cylindrical structure at the connection point with the diffuser (100), allowing leaked fluid to easily flow into the diffuser (100). The heat exchange fluid, i.e., the fluid, can be condensate. The heat exchanger (220) typically includes heat exchange tubes and fins arranged in parallel on the heat exchange tubes for heat exchange.

[0049] Furthermore, it is worth noting that the diffuser tube (100) is a common structure in dust collectors in this field. A leak detection device (300) can be installed on the diffuser tube (100) of an existing dust collector. The diffuser tube (100) is also called a dust collector inlet horn, an electrostatic precipitator inlet horn, etc. The leak detection device (300) provided in this embodiment uses an insulating plate (320). Even if dust accumulates on the insulating plate (320), leak detection can still be achieved. After the fluid wets the dust, it contacts the bottom of the leak detection probe (312) and simultaneously connects the two poles of the power supply (330), triggering the alarm (340). If the dust layer is thick, the fluid will overflow the dust layer before it wets the dust and contact the leak detection probe (312), still connecting the circuit and triggering the alarm (340), making leak detection more effective and avoiding the influence of dust on the leak detection effect.

[0050] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A dust removal device for dust removal and leak detection of flue gas from a low-temperature economizer (200), characterized in that, The dust removal equipment includes: The dust removal equipment body and the diffuser tube (100) are provided, wherein the first end of the diffuser tube (100) is used to connect to the low-temperature economizer (200), and the second end of the diffuser tube (100) is connected to the dust removal equipment body. A leakage monitoring device (300) is disposed on the inner wall of the diffusion tube (100). The leakage monitoring device (300) includes a probe assembly (310), an insulating plate (320), a power supply (330), and an alarm (340). The first end of the probe assembly (310) is connected to the diffusion tube (100) and is insulated from the inner wall of the diffusion tube (100). The second end of the probe assembly (310) is connected to the insulating plate (320). The first end of the power supply (330) is electrically connected to the probe assembly (310), the second end of the power supply (330) is electrically connected to the first end of the alarm (340), the second end of the alarm (340) is electrically connected to the diffuser (100), and the probe assembly (310) is made of conductive material. The diffuser tube (100) includes a bottom wall (110) that is inclined downward in a direction away from the low-temperature economizer (200), and the insulating plate (320) is laid on the bottom wall (110). The insulating plate (320) is laid on the bottom wall (110) near the first end of the diffuser tube (100); Alternatively, the edge of the insulating plate (320) coincides with the first end edge of the diffuser tube (100); The diffuser tube (100) also includes a top wall (120) and two side walls (130). The top wall (120), the side walls (130) and the bottom wall (110) form a cylindrical structure of the diffuser tube (100). The bottom wall (110) is located below and the top wall (120) is located above. The top wall (120) is inclined upward in a direction away from the low-temperature economizer (200). The side walls (130) are located on both sides and gradually move away from each other in a direction away from the low-temperature economizer (200). The probe assembly (310) is connected to the side walls. The probe assembly (310) is used to contact the leaking fluid, and the alarm (340) is used to generate a leak detection signal.

2. The dust removal equipment according to claim 1, characterized in that, The probe assembly (310) includes a probe fixing rod (311), a leak detection probe (312), and an insulating head (313); The probe fixing rod (311) is a columnar rod structure. Both the probe fixing rod (311) and the leak detection probe (312) are made of conductive material. One end of the leak detection probe (312) is connected to the probe fixing rod (311), and the other end of the leak detection probe (312) extends toward the insulating plate (320) and is connected to the insulating plate (320). There are two insulating heads (313). The probe fixing rod (311) is connected to the diffuser tube (100) at both ends. The insulating head (313) is located between the end of the probe fixing rod (311) and the diffuser tube (100). The insulating head (313) is used to insulate the probe fixing rod (311) from the diffuser tube (100).

3. The dust removal equipment according to claim 2, characterized in that, The number of the leak detection probes (312) is multiple, and the multiple leak detection probes (312) are arranged in parallel on the probe fixing rod (311).

4. A dust removal device according to claim 2, characterized in that, The leak detection probe (312) extends vertically downwards.

5. A dust removal device according to claim 1, characterized in that, The sidewall of the diffuser tube (100) is conical.

6. A boiler system, characterized in that, Includes the dust removal equipment as described in claims 1-5 above, as well as the low-temperature economizer (200) and the boiler; The low-temperature economizer (200) includes a flue (210) and a heat exchanger (220). The flue (210) is horizontally arranged. One end of the flue (210) is connected to the outlet of the boiler, and the other end is connected to the first end of the diffuser (100). The heat exchanger (220) is arranged in the flue (210). The flue gas discharged from the outlet of the boiler passes through the flue (210) and exchanges heat with the heat exchanger (220) before flowing to the diffuser (100). The heat exchanger (220) is used to circulate heat exchange fluid.

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