Drainage device and gas-fired boiler system
By designing drainage pipes and water storage tanks in the gas-fired boiler system, the problem of water accumulation in the flue in the negative pressure section was solved, achieving external drainage of accumulated water and safety protection of the induced draft fan, thus avoiding equipment damage.
Patent Information
- Application Number
- CN202520114734.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2035-01-17
AI Technical Summary
In gas-fired boiler systems, water accumulation in the negative pressure flue is difficult to drain, leading to accidents such as increased vibration of the induced draft fan, bearing damage, and motor burnout. Existing drainage devices fail to drain due to air intrusion.
Design a water-repellent device including a drain pipe and a water storage tank. The pressure at the inlet end of the drain pipe is greater than that of the negative pressure section flue, and it extends to the bottom of the liquid surface in the water storage tank to form a water seal. The accumulated water flows into the water storage tank through the drain pipe and is discharged outside, maintaining a negative pressure state and preventing air compression.
It effectively drains accumulated water from the negative pressure flue, protects the safe operation of the induced draft fan, prevents dynamic imbalance, and improves equipment reliability and testing efficiency.
Smart Images
Figure CN223635906U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of drainage systems, and particularly relates to a drainage device and a gas boiler system. BACKGROUND
[0002] At present, metallurgical and coking enterprises all have self-provided gas boiler systems; among them,
[0003] The gas boiler system takes the induced draft fan as a demarcation point, and the pressure inside the flue between the outlet of the desulfurization and dust removal facility and the suction inlet of the induced draft fan is lower than atmospheric pressure, which is a negative pressure section;
[0004] The pressure inside the flue between the discharge outlet of the induced draft fan and the chimney is higher than atmospheric pressure, which is a positive pressure section. In the running state, when the heat exchange module (such as the economizer and the low-temperature reheater) of the gas boiler system leaks due to failure or wear, the steam and water in the heat exchange module will leak into the negative pressure section and gather at the lowest point of the negative pressure section flue. If the accumulated water cannot be discharged in time, the steam and water mixture will enter the volute of the induced draft fan with the flue gas and adhere to the fan impeller, which will destroy the dynamic balance of the induced draft fan and cause the vibration of the induced draft fan to increase. In addition, it is easy to cause accidents such as bearing damage and motor burning, so it is necessary to install a drainage pipeline and valve group at the low point position of the negative pressure section to facilitate the external discharge of the steam and water.
[0005] However, in the running state of the boiler, the pressure inside the negative pressure section flue is lower than atmospheric pressure. After the drainage valve group is opened, external air will "surge" into the negative pressure section flue in the reverse direction through the drainage valve. The accumulated water in the flue cannot flow out naturally due to the "extrusion" of the incoming air, forming a "waterfall backflow" situation, and thus the drainage function fails to complete the external discharge of the accumulated water. Therefore, it is a technical problem to be solved by those skilled in the art to invent a device that can realize the normal discharge of the accumulated water in the negative pressure section flue of the gas boiler. SUMMARY
[0006] To solve the above technical problems, the application provides a drainage device to solve the technical problem that the accumulated water in the negative pressure section flue is difficult to discharge in the prior art.
[0007] The technical scheme adopted to achieve the purpose of the application is as follows:
[0008] A drainage device for discharging accumulated water in a negative pressure section flue, the low point of the negative pressure section flue being provided with a drainage opening, comprising:
[0009] a drainage pipe, the water inlet end of the drainage pipe being in communication with the drainage opening, and the water column pressure value at the height of the water inlet end of the drainage pipe being greater than the pressure value in the negative pressure section flue; and
[0010] A water storage tank is arranged below the negative pressure section flue to receive the water discharged from the negative pressure section flue and seal the negative pressure section flue, and the water outlet end of the drain pipe extends into the water storage tank below the liquid level in the water storage tank.
[0011] To better achieve the present application, the water inlet end of the drain pipe is provided with an on-off valve, and the water inlet end of the drain pipe is communicated with the drain port through the on-off valve.
[0012] To better achieve the present application, the water inlet end of the drain pipe is provided with an on-off valve, and the water inlet end of the drain pipe is communicated with the drain port through the on-off valve.
[0013] To better achieve the present application, the water inlet end of the drain pipe is provided with an on-off valve, and the water inlet end of the drain pipe is communicated with the drain port through the on-off valve.
[0014] The water outlet end of the drain pipe extends into the water storage tank through the insertion port.
[0015] To better achieve the present application, the water inlet end of the drain pipe is provided with an on-off valve, and the water inlet end of the drain pipe is communicated with the drain port through the on-off valve.
[0016] To better achieve the present application, the water inlet end of the drain pipe is provided with an on-off valve, and the water inlet end of the drain pipe is communicated with the drain port through the on-off valve.
[0017] To better achieve the present application, the water inlet end of the drain pipe is provided with an on-off valve, and the water inlet end of the drain pipe is communicated with the drain port through the on-off valve.
[0018] To better achieve the present application, the water inlet end of the drain pipe is provided with an on-off valve, and the water inlet end of the drain pipe is communicated with the drain port through the on-off valve.
[0019] To better achieve the present application, the water inlet end of the drain pipe is provided with an on-off valve, and the water inlet end of the drain pipe is communicated with the drain port through the on-off valve.
[0020] In another aspect, the present application also provides a gas boiler system, which comprises a negative pressure section flue, a fan and the above-mentioned water drainage device.
[0021] The gas outlet end of the negative pressure section flue is communicated with the air inlet end of the induced draft fan.
[0022] The water inlet end of the drain pipe of the water drainage device is communicated with the drain port of the negative pressure section flue.
[0023] According to the technical scheme, the water drainage pipe in the water drainage device extends into the water storage tank and is located below the liquid level in the water storage tank to form a water seal, and the pressure value at the water inlet end of the water drainage pipe is greater than the pressure value in the negative pressure section flue, so that the liquid in the water storage tank is prevented from being sucked into the negative pressure section flue, the negative pressure state in the negative pressure section flue is maintained, and when the water accumulation in the negative pressure section flue, the water accumulation flows into the water drainage pipe from the water drainage opening of the negative pressure section flue and then flows into the water storage tank along the water drainage pipe to be drained, so that the problem that the water cannot be drained due to the "squeezing" of the sucked air is solved, and the safe operation of the induced draft fan is effectively protected. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 A structural schematic diagram of a water drainage device provided by the application.
[0025] Figure 2 A structural schematic diagram of a water storage tank in a water drainage device provided by the application.
[0026] BRIEF DESCRIPTION OF DRAWINGS
[0027] 1 - water drainage pipe; 2 - water storage tank; 21 - water inlet, 22 - insertion opening, 23 - water outlet, 24 - overflow opening; 3 - on-off valve; 4 - water drainage valve; 5 - overflow valve; 6 - negative pressure section flue; 7 - fan. DETAILED DESCRIPTION
[0028] In order to make the skilled person in the technical field to which the application belongs more clearly understand the application, the technical scheme of the application will be described in detail below with reference to the drawings and specific embodiments.
[0029] In the embodiments of the application, as shown in Figure 1 and Figure 2 , the water drainage device comprises a water drainage pipe 1 and a water storage tank 2; wherein,
[0030] The water inlet end of the water drainage pipe 1 is in communication with the water outlet, and the water column pressure value at the height of the water inlet end of the water drainage pipe 1 is greater than the pressure value in the negative pressure section flue 6;
[0031] The water storage tank 2 is arranged below the negative pressure section flue 6, the water outlet end of the water drainage pipe 1 extends into the inside of the water storage tank 2 and is located below the liquid level in the water storage tank 2, as shown in Figure 1 .
[0032] According to the "Bernoulli principle", the water outlet end of the water drainage pipe 1 is located below the liquid level in the water storage tank 2 to form a water seal, and the water column pressure value at the height of the water inlet end of the water drainage pipe 1 is greater than the pressure value in the negative pressure section flue 6, so that the water in the water storage tank 2 will not be sucked into the negative pressure section flue 6, so as to maintain the negative pressure state in the negative pressure section flue 6;
[0033] When the heat exchange tube of the gas boiler system is damaged or worn, and steam and water leakage occurs, water will accumulate in the negative pressure section flue 6, and the water will flow along the inner wall of the negative pressure section flue 6 to the drain pipe 1. At this time, the water column height increases, the water column static pressure balance in the drain pipe 1 is broken, the negative pressure in the negative pressure section flue 6 cannot "suck" the water column in the drain pipe 1, and the water column will sink and part of the water will flow into the water storage tank 2, so that a new water column with static pressure balance is formed in the drain pipe 1, the discharge of the accumulated water is completed, and the water is prevented from entering the induced draft fan 7 and adhering to the fan impeller, so that the dynamic balance of the induced draft fan 7 is destroyed, the vibration is increased, the bearing is damaged, and the motor is burned, and the like.
[0034] Preferably, the volume of the water storage tank 2 is greater than the volume of the drain pipe 1, so that the water in the water storage tank 2 can fill the drain pipe 1 and overflow the drain end of the drain pipe 1 to form a water seal, and the water in the water storage tank 2 is prevented from being sucked into the negative pressure section flue 6, so that the negative pressure state in the negative pressure section flue 6 is maintained, and the good working state of the boiler steam and water system is ensured.
[0035] In some embodiments, the water inlet end of the drain pipe 1 is provided with an on-off valve 3, and the water inlet end of the drain pipe 1 is communicated with the drain port through the on-off valve 3.
[0036] By closing the on-off valve 3, the drain pipe 1 and the negative pressure section flue 6 can be cut off, so that the drain device can be maintained, such as flushing and cleaning.
[0037] In some embodiments, the water inlet end of the on-off valve 3 and the water outlet end of the on-off valve 3 are connected to the negative pressure section flue 6 and the drain pipe 1 through flanges, so that the on-off valve 3 and the drain pipe 1 are more convenient to install and disassemble. Preferably, sealing rings are arranged at the connection between the on-off valve 3 and the negative pressure section flue 6 and the connection between the on-off valve 3 and the drain pipe 1, so as to prevent air from entering the negative pressure section flue 6 through the connection between the on-off valve 3 and the negative pressure section flue 6 and the connection between the on-off valve 3 and the drain pipe 1, and to prevent the water column static pressure balance in the drain pipe 1 from being broken; or, the accumulated water in the negative pressure section flue 6 leaks from the connection between the on-off valve 3 and the negative pressure section flue 6 and the connection between the on-off valve 3 and the drain pipe 1.
[0038] In some embodiments, the water storage tank 2 is a closed box, and a water inlet 21 and an insertion port 22 are arranged at the top of the water storage tank 2 and communicated with the inside of the water storage tank 2.
[0039] The drain end of the drain pipe 1 extends to the inside of the water storage tank 2 through the insertion port 22, and the insertion port 22 and the outer side wall of the drain pipe 1 are connected by welding.
[0040] The water injection port 21 can inject water into the water storage tank 2 and also play a "breathing" role to balance the water level fluctuation caused by the pressure fluctuation in the negative pressure section flue 6.
[0041] In some embodiments, the bottom of the water storage tank 2 is provided with a discharge port 23, and a drain valve 4 is arranged at the discharge port 23; wherein,
[0042] The drain valve 4 is in a normally closed state to avoid the water in the water storage tank 2 being discharged outward to cause the water level in the water storage tank 2 to drop, so that the water level cannot cover the drainage end of the drain pipe 1, and the external air enters the negative pressure section flue 6 from the drainage end of the drain pipe 1;
[0043] When the drain device needs to be maintained, the drain valve 4 can be opened to completely discharge the water in the water storage tank 2, so that the staff can clean and maintain the inside of the water storage tank 2. Preferably, the inner bottom wall of the water storage tank 2 is inclined, as shown in Figure 2 , the discharge port 23 is arranged close to the end of the inner bottom wall of the water storage tank 2 away from the top of the water storage tank 2, so that the water in the water storage tank 2 is more convenient and complete to discharge, thereby further improving the convenience of the drain device during maintenance.
[0044] In some embodiments, the side wall of the water storage tank 2 is provided with an overflow port 24; in the working state, the liquid level in the water storage tank 2 is equal to the height at which the overflow port 24 is located (the position of the lowest point of the overflow port 24), as shown in Figure 1 ;
[0045] If the heat exchange module of the boiler steam-water system leaks, the accumulated water in the negative pressure section flue 6 will flow into the water storage tank 2, so that the liquid level in the water storage tank 2 increases, and the increased water will be discharged outward through the overflow port 24. The staff can determine whether the heat exchange module is damaged by checking whether there is water discharged from the overflow port 24. Preferably, the overflow port 24 is provided with an overflow valve 5, and the overflow valve 5 is in a normally open state to ensure that the water exceeding the height of the overflow port 24 can be normally discharged through the overflow port 24.
[0046] Based on the above-mentioned drain device, the application further provides a gas boiler system, which comprises a negative pressure section flue 6, a fan and the above-mentioned drain device.
[0047] The gas outlet end of the negative pressure section flue 6 communicates with the air inlet end of the induced draft fan 7.
[0048] The water inlet end of the drain pipe 1 in the drain device communicates with the water discharge port of the negative pressure section flue 6.
[0049] Through the above-mentioned embodiments, the application has the following beneficial effects or advantages:
[0050] 1) the drain pipe 1 in the hydrophobic device extends into the water storage tank 2 and is below the liquid level of the water storage tank 2 to form a water seal, and the pressure value of the water inlet end of the drain pipe 1 is greater than the pressure value in the negative pressure section flue 6, which can avoid the liquid in the water storage tank 2 being sucked into the negative pressure section flue 6, so as to maintain the negative pressure state in the negative pressure section flue 6, and when the water accumulation caused by the steam and water gathering in the negative pressure section flue 6, the water accumulation will flow into the drain pipe 1 from the drain outlet of the negative pressure section flue 6, and then flow into the water storage tank 2 along the drain pipe 1 to realize external discharge, so as to solve the problem of "extrusion" caused by the suction of air, thereby effectively protecting the safe operation of the induced draft fan 7.
[0051] 2) the drain pipe 1 in the hydrophobic device is connected with the negative pressure section flue 6 through the on-off valve 3, and by closing the on-off valve 3, the drain pipe 1 and the negative pressure section flue 6 can be cut off, so as to facilitate the maintenance work such as flushing and cleaning of the hydrophobic device.
[0052] 3) the overflow port 24 is arranged on the side wall of the water storage tank 2 in the hydrophobic device, and the liquid level in the water storage tank 2 is ensured to be equal to the height of the overflow port 24, so that the workers can judge whether the heat exchange module of the boiler steam-water system is damaged or not by whether there is water discharged from the overflow port 24, so as to realize the rapid detection of the heat exchange module of the boiler steam-water system and improve the detection efficiency.
[0053] Although the preferred embodiments of the present application have been described, those skilled in the art can make further changes and modifications to the embodiments once they know the basic inventive concept. Therefore, the appended claims are intended to cover all such changes and modifications that fall within the scope of the present application.
[0054] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.
Claims
1. A hydrophobic device for the discharge of water accumulated in a negative pressure section flue (6) provided with a drain opening at the level of the low point of said negative pressure section flue (6), characterized in that, The drainage pipe (1) is communicated with the drain port at the water inlet end, and the water column pressure value at the height of the water inlet end of the drainage pipe (1) is greater than the pressure value in the negative pressure section flue (6); and The water storage tank (2) is used for receiving the water discharged from the negative pressure section flue (6) and realizing the sealing of the negative pressure section flue (6), the water storage tank (2) is arranged below the negative pressure section flue (6), and the drainage end of the drainage pipe (1) extends to the inside of the water storage tank (2) and is below the liquid level in the water storage tank (2). The water inlet end of the drainage pipe (1) is provided with an on-off valve (3), and the water inlet end of the drainage pipe (1) is communicated with the drain port through the on-off valve (3).
2. The hydrophobic device of claim 1, wherein, The water inlet end of the on-off valve (3) and the water outlet end of the on-off valve (3) are connected with the negative pressure section flue (6) and the drainage pipe (1) through flanges.
3. The hydrophobic device of claim 2, wherein, The top of the water storage tank (2) is provided with a water inlet port (21) and an insertion port (22) communicated with the inside of the water storage tank (2); 4. The hydrophobic device of claim 1, wherein, The drainage end of the drainage pipe (1) extends to the inside of the water storage tank (2) through the insertion port (22). The bottom of the water storage tank (2) is provided with a discharge port (23), and a drainage valve (4) is arranged at the discharge port (23).
5. The hydrophobic device of claim 4, wherein, The inner side bottom wall of the water storage tank (2) is arranged to be inclined, and the discharge port (23) is arranged close to one end of the inner side bottom wall of the water storage tank (2) away from the top of the water storage tank (2).
6. The hydrophobic device of claim 5, wherein, An overflow port (24) is arranged on the side wall of the water storage tank (2).
7. The hydrophobic device of claim 6, wherein, An overflow valve (5) is arranged at the overflow port (24).
8. The hydrophobic device of claim 7, wherein, The volume of the water storage tank (2) is greater than the volume of the drainage pipe (1).
9. The hydrophobic device of any one of claims 1 to 8, wherein, The negative pressure section flue (6), the induced draft fan (7) and the drainage device of any one of claims 1 to 9 are included; 10. A gas-fired boiler system, characterized by The gas outlet end of the negative pressure section flue (6) is communicated with the gas inlet end of the induced draft fan (7); The water inlet end of the drainage pipe (1) in the drainage device is communicated with the drain port of the negative pressure section flue (6).