A smoke exhaust pipe system
By designing the closing part with a tapered flow section and a sleeve part formed by negative pressure in the heating grate smoke exhaust pipe system, the flue gas leakage problem caused by corrosion and dust accumulation is solved, and effective energy preservation and equipment life are achieved.
Patent Information
- Application Number
- CN202420446194.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-07
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-03-07
AI Technical Summary
In the smoke exhaust pipeline system of the heating furnace, the emergency discharge valve is in a high temperature and corrosive environment for a long time, resulting in corrosion on the sealing surface and dust accumulation, causing flue gas leakage and wasting energy.
A smoke exhaust pipe system is designed, wherein the emergency smoke exhaust pipe is connected to the bypass port of the casing part of the main pipe. The smoke outlet side of the first pipe section of the main pipe is provided with a closed mouth with a tapered flow section, and the closed mouth is located in the lumen of the casing part to form a negative pressure to prevent smoke leakage.
It effectively avoids normal discharge of flue gas from the emergency exhaust pipe, reduces energy waste, extends the service life of the emergency exhaust valve, and reduces operating costs.
Smart Images
Figure CN222718716U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heating furnaces, in particular to a smoke exhaust pipeline system. Background Art
[0002] like Figure 1 As shown, in the exhaust pipe system of the heating furnace, an emergency exhaust pipe 1 is usually connected to the main pipe. The emergency exhaust pipe 1 is only activated when the furnace is turned on or the temperature is too high. When the heating furnace is operating normally, the emergency exhaust valve 11 on the emergency exhaust pipe 1 is in a closed state, and the smoke flows along the main pipe to achieve normal discharge. When the emergency exhaust pipe 1 is activated, the emergency exhaust valve 11 is opened, and the smoke can flow along the emergency exhaust pipe 1 to achieve emergency discharge.
[0003] With the use of the heating furnace, the emergency discharge valve 11 is in a high temperature and corrosive environment for a long time, and the valve sealing surface will inevitably be corroded. In addition, a large amount of dust in the flue gas will accumulate on the valve sealing surface. The above two factors cause the emergency discharge valve 11 in the closed state to be not completely closed, so part of the flue gas leaks from the emergency exhaust pipe 1, and at the same time, it will take away the heat in the flue gas and cause energy waste. Therefore, how to prevent the normal exhaust gas from leaking from the emergency exhaust pipe 1 has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content
[0004] In view of this, an object of the present invention is to provide a smoke exhaust pipe system, which can effectively prevent the normal exhaust smoke from leaking from the emergency smoke exhaust pipe.
[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0006] A smoke exhaust pipe system comprises a main pipe and an emergency smoke exhaust pipe connected to the main pipe in a bypass manner, wherein the main pipe comprises:
[0007] A first pipe section, wherein a closing portion with a gradually decreasing flow cross section is provided on the smoke outlet side of the first pipe section;
[0008] a second pipe section, located downstream of the first pipe section;
[0009] The sleeve part connects the first pipe section and the second pipe section, the closing part is located in the tube cavity of the sleeve part, and the tube wall of the sleeve part is provided with a bypass port connected to the emergency smoke exhaust pipe.
[0010] Optionally, in the above-mentioned smoke exhaust pipe system, an emergency exhaust valve is provided at a position of the emergency smoke exhaust pipe near the bypass port, and a pressure tapping port for connecting a pressure detection pressure tapping pipe is provided at a portion of the emergency smoke exhaust pipe located between the emergency exhaust valve and the bypass port.
[0011] Optionally, in the above-mentioned smoke exhaust pipe system, the emergency exhaust valve is a butterfly valve.
[0012] Optionally, in the above-mentioned smoke exhaust pipe system, the closing portion is conical.
[0013] Optionally, in the above smoke exhaust pipe system, the sleeve portion is cylindrical.
[0014] Optionally, in the above-mentioned smoke exhaust pipe system, the sleeve portion and the closing portion are coaxially arranged.
[0015] Optionally, in the above-mentioned smoke exhaust pipe system, the inner diameter of the sleeve portion is 150 mm to 300 mm larger than the outer diameter of the larger end of the closing portion.
[0016] Optionally, in the above-mentioned smoke exhaust pipe system, the second pipe section is coaxially arranged with the closing portion.
[0017] Optionally, in the above-mentioned smoke exhaust pipe system, the inner diameter of the second pipe section is larger than the inner diameter of the smaller end of the closing portion.
[0018] Optionally, in the above-mentioned smoke exhaust pipe system, the inner diameter of the second pipe section is equal to the inner diameter of the larger end of the closing portion.
[0019] In the smoke exhaust pipe system provided by the utility model, the emergency smoke exhaust pipe is connected to the bypass port of the sleeve part of the main pipe, and the first pipe section of the main pipe close to the upstream side is provided with a closing part extending into the tube cavity of the sleeve part, and the flow cross section of the closing part gradually shrinks along the flow direction of the smoke. Therefore, under the working condition of normal smoke exhaust, that is, when the emergency exhaust valve on the emergency smoke exhaust pipe is closed, according to the Venturi effect, the smoke forms a negative pressure when passing through the sleeve part, so that even if the valve of the emergency exhaust valve is not completely closed, the smoke will not leak along the emergency smoke exhaust pipe. It can be seen that the smoke exhaust pipe system of the utility model can effectively prevent the normal exhaust smoke from leaking from the emergency smoke exhaust pipe. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0021] Figure 1 It is a schematic diagram of the exhaust pipe system of the heating furnace;
[0022] Figure 2 It is a schematic diagram of a smoke exhaust duct system provided in an embodiment of the utility model.
[0023] The markings in the figure are:
[0024] 1. Emergency smoke exhaust pipe; 11. Emergency discharge valve; 21. First pipe section; 22. Second pipe section; 23. Casing; 231. Pipe cavity; 3. Pressure detection and pressure taking pipe. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] See also Figure 2 The embodiment of the utility model provides a smoke exhaust pipe system, including a main pipe and an emergency smoke exhaust pipe 1 connected to the main pipe in a bypass manner, wherein the main pipe includes a first pipe section 21, a second pipe section 22 located downstream of the first pipe section 21, and a sleeve portion 23 connecting the first pipe section 21 and the second pipe section 22. A closing portion with a gradually decreasing flow cross section is provided on the smoke outlet side of the first pipe section 21, and the closing portion is located in a pipe cavity 231 of the sleeve portion 23, and a bypass port connected to the emergency smoke exhaust pipe 1 is provided on the pipe wall of the sleeve portion 23.
[0027] When the flue gas from the heating furnace flows along the main pipeline, the flue gas enters the tube cavity 231 of the casing portion 23 from the first pipe section 21, then enters the second pipe section 22, and finally goes to the next process, such as to the downstream equipment such as the heat exchanger and the dust collector. Figure 2 It can be seen that the smoke outlet side of the first pipe section 21 is set as a closing part, which extends into the tube cavity 231 of the sleeve part 23. Under normal smoke exhaust conditions, that is, when the emergency exhaust valve 11 is closed, according to the Venturi effect, the smoke forms a negative pressure when passing through the sleeve part 23. In this way, even if the valve of the emergency exhaust valve 11 is not completely closed, the smoke will not leak along the emergency exhaust pipe 1. At most, a small amount of air will enter the main pipeline from the outside along the emergency exhaust pipe 1 and mix with the smoke to flow to the second pipe section 22, which will not affect the operation of the entire system. When the emergency exhaust pipe 1 needs to be activated, such as when the heating furnace is ignited or the temperature is too high, the emergency exhaust valve 11 is opened, and the smoke can enter the emergency exhaust pipe 1 through the tube cavity 231 of the sleeve part 23 after coming out of the first pipe section 21, and then go to the emergency exhaust port.
[0028] After the smoke exhaust pipe system of the utility model is applied to the heating furnace, it can effectively prevent the normal exhaust smoke from leaking from the emergency smoke exhaust pipe 1, which is not only more environmentally friendly and reduces the heat loss of the system, but also helps to extend the service life of the emergency exhaust valve 11, that is, it helps to reduce the valve replacement cycle, thereby reducing operating costs.
[0029] In a preferred embodiment, the emergency discharge valve 11 is arranged at a position close to the bypass port of the emergency exhaust pipe 1, and a pressure port for connecting the pressure detection and pressure taking pipe 3 is provided in the portion of the emergency exhaust pipe 1 between the emergency discharge valve 11 and the bypass port. The air pressure on the side of the emergency discharge valve 11 close to the main pipe can be obtained through the pressure detection and pressure taking pipe 3, so as to better monitor the operating status of the exhaust pipe system.
[0030] In specific practical applications, the type of emergency discharge valve 11 can be selected in a variety of ways. For example, the emergency discharge valve 11 can be set as a butterfly valve (also called a flap valve). In a preferred embodiment, the closing portion of the first pipe section 21 is set to a conical shape, the sleeve portion 23 is set to a cylindrical shape, and the sleeve portion 23 is coaxially arranged with the closing portion. Of course, in other embodiments, the shape of the closing portion, the shape of the sleeve portion 23, and the positional relationship between the center line of the sleeve portion 23 and the closing portion can be set to other forms as needed. For example, the closing portion can be set to a pyramid shape, and the sleeve portion 23 can be set to a prismatic shape.
[0031] like Figure 2 As shown, in the embodiment where the closing portion is conical and the sleeve portion 23 is cylindrical, the inner diameter of the sleeve portion 23 is generally set to be 150mm to 300mm larger than the outer diameter of the larger end of the closing portion, for example, the inner diameter of the sleeve portion 23 is 200mm or 250mm larger than the outer diameter of the larger end of the closing portion. In a preferred embodiment, the second pipe section 22 is coaxially arranged with the closing portion. Further preferably, the inner diameter of the second pipe section 22 is larger than the inner diameter of the smaller end of the closing portion, for example, the inner diameter of the second pipe section 22 can be set to be equal to the inner diameter of the larger end of the closing portion.
[0032] like Figure 2 As shown in FIG. 1 , in this embodiment, the closing portion of the first pipe segment 21 completely extends into the tube cavity 231 of the sleeve portion 23. In other embodiments, the closing portion of the first pipe segment 21 may also partially extend into the tube cavity 231 of the sleeve portion 23, that is, a part of the closing portion is exposed outside the sleeve portion 23, and the other part extends into the sleeve portion 23. In addition, the second pipe segment 22 may be as follows Figure 2 As shown, a portion of the bypass port 21 extends into the sleeve portion 23, or it may be completely located outside the sleeve portion 23 like the emergency smoke exhaust pipe 1. The distance between the closing portion of the first pipe section 21 and the second pipe section 22 is generally not less than half of the cross-sectional dimension of the emergency smoke exhaust pipe 1. For example, when the emergency smoke exhaust pipe 1 is a round pipe, the distance between the closing portion and the second pipe section 22 is generally set to be greater than the radius of the emergency smoke exhaust pipe 1. In a preferred embodiment, the center line of the bypass port on the pipe wall of the sleeve portion 23 (at Figure 2In the embodiment shown, the bypass port coincides with the center line of the emergency smoke exhaust pipe 1) and is aligned with the end surface of the closing portion of the first pipe section 21. Of course, in other embodiments, the bypass port can also be set to face the area between the closing portion and the second pipe section 22.
[0033] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0034] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A smoke exhaust pipe system, comprising a main pipe and an emergency smoke exhaust pipe connected to the main pipe in a bypass manner, characterized in that: The main pipeline comprises: A first pipe section, wherein a closing portion with a gradually decreasing flow cross section is provided on the smoke outlet side of the first pipe section; a second pipe section, located downstream of the first pipe section; The sleeve part connects the first pipe section and the second pipe section, the closing part is located in the tube cavity of the sleeve part, and the tube wall of the sleeve part is provided with a bypass port connected to the emergency smoke exhaust pipe.
2. The smoke exhaust duct system according to claim 1, characterized in that: An emergency exhaust valve is arranged at a position of the emergency exhaust pipe close to the bypass port, and a pressure tapping port for connecting a pressure detection and pressure tapping pipe is provided at a portion of the emergency exhaust pipe between the emergency exhaust valve and the bypass port.
3. The smoke exhaust duct system according to claim 2, characterized in that: The emergency discharge valve is a butterfly valve.
4. The smoke exhaust duct system according to any one of claims 1 to 3, characterized in that: The closing portion is conical.
5. The smoke exhaust duct system according to claim 4, characterized in that: The sleeve portion is cylindrical.
6. The smoke exhaust duct system according to claim 5, characterized in that: The sleeve portion is coaxially arranged with the closing portion.
7. The smoke exhaust duct system according to claim 6, characterized in that: The inner diameter of the sleeve portion is 150 mm to 300 mm larger than the outer diameter of the larger end of the closing portion.
8. The smoke exhaust duct system according to claim 5, characterized in that: The second pipe section is coaxially arranged with the closing portion.
9. The smoke exhaust duct system according to claim 8, characterized in that: The inner diameter of the second pipe section is larger than the inner diameter of the smaller end of the closing portion.
10. The smoke exhaust duct system according to claim 9, characterized in that: The inner diameter of the second pipe section is equal to the inner diameter of the larger end of the closing portion.