Local exhaust system for separating steam condensate water
By designing a local exhaust system and using the separation wire mesh and the secondary separation plate to separate the steam condensate, the adverse impact of steam condensate on the production environment in the spinning process of the chemical fiber industry is solved, the operating conditions and product quality are improved, and the service life of the exhaust fan is extended.
Patent Information
- Application Number
- CN202422592832.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-26
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-26
AI Technical Summary
In the spinning process production of chemical fiber industry, the aggregation and condensation of steam condensate in the factory lead to adverse effects on the production and operating environment, affecting product quality and personnel health.
Design a local exhaust system to separate steam condensate, including local exhaust hoods, exhaust branch pipes, steam condensate separators, condensate collection tanks and other components. The steam condensate is effectively separated by the primary separation screen and the secondary separation plate to reduce the amount of condensate entering the exhaust fan.
Effectively eliminate steam and waste heat in the factory, improve the production environment, improve product quality, reduce liquid damage to the exhaust fan, and extend the service life of the fan.
Smart Images
Figure CN223283189U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of industrial plant ventilation, and in particular relates to a local exhaust system for separating steam condensate. Background Art
[0002] Currently, the chemical fiber industry's spinning process requires the use of low-pressure saturated steam (e.g., P = 0.3 MPa, T = 144°C) to treat intermediate products to improve their properties and quality. During this process, these functional sections of the equipment emit large amounts of steam into the room, which in turn releases a significant amount of excess heat and moisture.
[0003] Because steam has a lower density than air, it first accumulates in the upper airspace of the factory building before dispersing throughout the facility. Some of this steam, upon contact with ambient-temperature process equipment and the beams and columns of civil engineering walls, condenses into liquid due to the cooling effect of the wall surfaces. Condensate from the suspended ceiling or ceiling above the factory building continuously drips down, adversely affecting the production environment. Any dripping onto the yarn tow can affect product quality and lead to substandard products. Condensate on the white walls within the factory building causes paint to peel and moisture to build up on the insulation, leading to mold and blackening over time. This not only reduces the lifespan of the building's insulation materials but also seriously affects the factory's aesthetic appearance. The steam that dissipates into the indoor air increases humidity and temperature, deteriorating air quality, causing discomfort for workers and adversely affecting their occupational health. Utility Model Content
[0004] To this end, the utility model provides a local exhaust system for separating steam condensate, which solves the problem that steam concentratedly generated in the functional section of equipment in industrial plants has an adverse effect on the production operating environment, affecting product quality and personnel health.
[0005] In order to achieve the above-mentioned object, the utility model provides the following technical solutions: a local exhaust system for separating steam condensate, comprising a local exhaust hood, an exhaust branch pipe, an exhaust main pipe, a steam condensate separator, a primary separation screen, a secondary separation plate, a condensate collecting tank, an eccentric reducer, an exhaust fan, a concentric reducer, and an exhaust pipe at the fan outlet;
[0006] The air outlet of the local exhaust hood is connected to the exhaust branch pipe, and the exhaust branch pipe is connected to the exhaust main pipe; the exhaust main pipe is connected to the steam condensate separator; the steam condensate separator is provided with the primary separation screen and the secondary separation plate inside; the first outlet of the steam condensate separator is connected to the condensate collecting tank; the second outlet of the steam condensate separator is connected to the eccentric reducer; the eccentric reducer is connected to the air inlet of the exhaust fan, and the air outlet of the exhaust fan is connected to the concentric reducer, and the concentric reducer is connected to the fan outlet exhaust pipe.
[0007] As a preferred solution for the local exhaust system for separating steam condensate, the combination of the local exhaust hood and the exhaust branch pipe is: a single exhaust branch pipe is connected to the conical local exhaust hood.
[0008] As a preferred solution for the local exhaust system for separating steam condensate, the combination of the local exhaust hood and the exhaust branch pipe is: two exhaust branch pipes are connected to a triangular local exhaust hood.
[0009] As a preferred solution for the local exhaust system for separating steam condensate, the exhaust branch pipe is a circular air duct or a rectangular air duct, and the local exhaust hood and the exhaust branch pipe are connected by a flange; each exhaust branch pipe is provided with a split multi-page regulating air valve above the local exhaust hood.
[0010] As a preferred solution for the local exhaust system for separating steam condensate, the exhaust main pipe is connected to the outlet of the steam heating box through an exhaust branch pipe; the exhaust main pipe is provided with an exhaust pipe elbow.
[0011] As a preferred solution for the local exhaust system for separating steam condensate, the bottom of the condensate collection tank is connected to a condensate receiving funnel, the bottom of the condensate receiving funnel is connected to a drain pipe, the drain pipe is provided with a plunger valve, and the outlet of the drain pipe is led to a drainage ditch.
[0012] As a preferred solution for a local exhaust system for separating steam condensate, the secondary separation plate includes a wire mesh shell, and a guide vane is welded inside the wire mesh shell, and the guide vane is inclined toward the bottom of the wire mesh shell.
[0013] As a preferred solution for the local exhaust system for separating steam condensate, a first flexible connecting air duct is provided between the eccentric reducer and the air inlet of the exhaust fan; a second flexible connecting air duct is provided between the air outlet of the exhaust fan and the concentric reducer.
[0014] As a preferred solution for the local exhaust system for separating steam condensate, the exhaust fan is installed on a concrete foundation or steel platform on the ground in a factory building or outdoors; the elevation of the bottom end of the exhaust fan inlet is more than 1.5m higher than the bottom end of the condensate collection tank.
[0015] The utility model has the following advantages: it is provided with a local exhaust hood, an exhaust branch pipe, an exhaust main pipe, a steam condensate separator, a primary separation screen, a secondary separation plate, a condensate collecting tank, an eccentric reducer, an exhaust fan, a concentric reducer, and an exhaust pipe at the fan outlet; the air outlet of the local exhaust hood is connected to the exhaust branch pipe, and the exhaust branch pipe is connected to the exhaust main pipe; the exhaust main pipe is connected to the steam condensate separator; a primary separation screen and a secondary separation plate are provided inside the steam condensate separator; the first outlet of the steam condensate separator is connected to the condensate collecting tank; the second outlet of the steam condensate separator is connected to the eccentric reducer; the eccentric reducer is connected to the air inlet of the exhaust fan, the air outlet of the exhaust fan is connected to the concentric reducer, and the concentric reducer is connected to the exhaust pipe at the fan outlet. The utility model can properly and reasonably organize the exhaust air flow, effectively remove the steam concentratedly generated in the functional section of the equipment in the industrial plant, effectively remove the waste heat and moisture emitted in the plant, improve the production environment inside the plant and the occupational health conditions of the operators, and improve the product quality; and effectively isolate the steam condensate generated in the exhaust process from the mainstream air, reduce the amount of condensate entering the exhaust fan, reduce the liquid impact damage to the fan blades under the action of the centrifugal force of the exhaust fan, and thus increase the service life of the exhaust fan. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.
[0017] Figure 1 This is a schematic structural diagram of a local exhaust system for separating steam condensate provided in an embodiment of the present utility model;
[0018] Figure 2 This is a schematic diagram of the structure of a secondary separation plate in a local exhaust system for separating steam condensate provided in an embodiment of the present invention.
[0019] In the figure, 1. local exhaust hood; 2. exhaust branch pipe; 3. exhaust main pipe; 4. steam condensate separator; 5. primary separation screen; 6. secondary separation plate; 7. condensate collecting tank; 8. eccentric reducer; 9. exhaust fan; 10. concentric reducer; 11. fan outlet exhaust duct; 12. regulating air valve; 13. steam heating box outlet; 14. exhaust duct elbow; 15. condensate receiving funnel; 16. drain pipe; 17. plunger valve; 18. drainage ditch; 19. screen shell; 20. guide plate; 21. first flexible connection duct; 22. second flexible connection duct. DETAILED DESCRIPTION
[0020] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.
[0021] See also Figure 1 and Figure 2 The embodiment of the utility model provides a local exhaust system for separating steam condensate, comprising a local exhaust hood 1, an exhaust branch pipe 2, an exhaust main pipe 3, a steam condensate separator 4, a primary separation screen 5, a secondary separation plate 6, a condensate collecting tank 7, an eccentric reducer 8, an exhaust fan 9, a concentric reducer 10, and an exhaust pipe 11 at the fan outlet;
[0022] Among them, the air outlet of the local exhaust hood 1 is connected to the exhaust branch pipe 2, the exhaust branch pipe 2 is connected to the exhaust main pipe 3; the exhaust main pipe 3 is connected to the steam condensate separator 4; the interior of the steam condensate separator 4 is provided with a primary separation screen 5 and a secondary separation plate 6; the first outlet of the steam condensate separator 4 is connected to the condensate collecting tank 7; the second outlet of the steam condensate separator 4 is connected to the eccentric reducer 8; the eccentric reducer 8 is connected to the air inlet of the exhaust fan 9, the air outlet of the exhaust fan 9 is connected to the concentric reducer 10, and the concentric reducer 10 is connected to the fan outlet exhaust pipe 11.
[0023] In this embodiment, the local exhaust hood 1 and exhaust branch pipe 2 are combined in a manner such that a single exhaust branch pipe 2 is connected to the conical local exhaust hood 1. Alternatively, the local exhaust hood 1 and exhaust branch pipe 2 may be combined in a manner such that two exhaust branch pipes 2 are connected to a triangular local exhaust hood 1; the exhaust branch pipe 2 may be a circular or rectangular duct, and the local exhaust hood 1 and exhaust branch pipe 2 are connected by a flange; and each exhaust branch pipe 2 is provided with a split multi-leaf damper 12 above the local exhaust hood 1.
[0024] Specifically, the local exhaust hood 1 adopts a receiving type exhaust hood, which is arranged above the equipment that emits water vapor in a concentrated manner. The specific connection form can be a single exhaust branch pipe 2 connected to a conical local exhaust hood 1, or two exhaust branch pipes 2 connected to a triangular local exhaust hood 1. The hood opening control wind speed of the local exhaust hood 1 is 0.6m / s-1m / s, and the exhaust volume of the local exhaust hood 1 is determined according to the hood opening control wind speed, the needs of the process equipment and the hood opening cross-sectional size. Among them, the exhaust branch pipe 2 can be a circular air duct or a rectangular air duct. The local exhaust hood 1 and the exhaust branch pipe 2 are connected by a flange. Each exhaust branch pipe 2 is provided with a split multi-page regulating air valve 12 above the local exhaust hood 1 to adjust the air volume of the local exhaust hood 1 and the corresponding exhaust branch pipe 2 to maintain the air volume balance of the entire local exhaust system.
[0025] In this embodiment, the exhaust main pipe 3 is connected to the steam heating box outlet 13 through an exhaust branch pipe 2; the exhaust main pipe 3 is provided with an exhaust pipe elbow 14.
[0026] Specifically, the steam heating box outlet 13 is a flange connection for exhausting steam from the equipment, and can be directly flanged to the end of the exhaust branch pipe 2. A pre-reserved steam outlet port on the equipment further facilitates the collection of steam. During the manufacture of the exhaust branch pipe 2, the duct flange, gasket opening diameter, and spacing that connect to the equipment are precisely aligned, facilitating bolted connection.
[0027] In this embodiment, a local exhaust main 3 is installed in the upper space of the factory building and is laid along a slope with a slope of i = 0.005-0.01, sloping toward the duct riser on the exhaust fan 9 side. This facilitates the flow and collection of small amounts of condensate generated in the duct. The wind speed in the exhaust branch duct 2 is 8-14 m / s, and the wind speed in the exhaust main 3 is 8-12 m / s.
[0028] In this embodiment, the bottom of the condensate collecting tank 7 is connected to a condensate receiving funnel 15, and the bottom of the condensate receiving funnel 15 is connected to a drain pipe 16. The drain pipe 16 is provided with a plunger valve 17, and the outlet of the drain pipe 16 is led to a drainage ditch 18; in addition, the secondary separation plate 6 includes a wire mesh shell 19, and a guide plate 20 is welded inside the wire mesh shell 19, and the guide plate 20 is inclined toward the bottom of the wire mesh shell 19.
[0029] Specifically, the steam condensate separator 4 is flange-connected to the exhaust pipe 3. All components of the steam condensate separator 4 are made of stainless steel, which avoids the rust of conventional galvanized steel sheets during long-term use, effectively improving the service life of the system.
[0030] In steam condensate separator 4, because the density and inertia of condensate are much greater than those of air, most of the steam condensate flows vertically into condensate collection tank 7 under the influence of flow inertia and gravity, and then drains into drain ditch 18 through stainless steel drain pipe 16. Primary separation screen 5 provides adhesion conditions, preventing a small amount of condensate from being carried into exhaust fan 9 by the airflow. Primary separation screen 5 is made of 5-10 mesh stainless steel.
[0031] Among them, after the initial separation by the primary separation screen 5, a small amount of condensed water enters the secondary separation plate 6 under the negative pressure of the exhaust fan 9. By changing the flow cross-section and flow angle, the airflow first enters this element at a 45° angle downward, and the gaseous air and water vapor return and flow upward at a 45° angle out of the secondary separation plate 6 and into the exhaust fan 9; the small amount of liquid condensed water carried is collected at the bottom along the guide plate 20, and then collected in the condensed water collection tank 7, and then discharged into the ditch through the stainless steel drain pipe 16. The welding node between the drain pipe 16 and the guide plate 20 needs to be firmly welded to ensure the structural stability of the secondary separation plate 6. The plunger valve 17 at the end of the drain pipe 16 has a sealing and shut-off function.
[0032] In one possible embodiment, the exhaust branch pipe 2, exhaust main pipe 3, and pipe accessories are made of stainless steel. This prevents the corrosion of conventional galvanized steel exhaust branch pipes 2 and exhaust main pipes 3 during prolonged use, effectively extending the system's service life. Welding is used between duct sections and between ducts and non-disassembled pipe fittings to reduce the number of condensate leak points. The duct thickness of the exhaust branch pipe 2 and exhaust main pipe 3 can be selected in accordance with the current national standard GB50243, "Code for Construction Quality Acceptance of Ventilation and Air-Conditioning Engineering."
[0033] In one possible embodiment, due to the high temperature caused by the large amount of steam emitted during production, the exhaust branch pipe 2 and the exhaust main pipe 3 are insulated. The insulation material is centrifugal glass wool, rock wool, or aluminum silicate wool, with an outer protective layer of aluminum foil. The insulation material for the exhaust main pipe 3 is centrifugal glass wool with a thickness of δ = 50 mm, and an outer protective layer of aluminum foil with a thickness of δ = 0.8 mm; the insulation material for the exhaust branch pipe 2 is centrifugal glass wool with a thickness of δ = 30 mm, and an outer protective layer of aluminum foil with a thickness of δ = 0.6 mm.
[0034] In a possible embodiment, the exhaust fan 9 is installed on a concrete foundation or steel platform on the ground in a factory building or outdoors; the elevation of the bottom end of the exhaust fan 9 inlet is more than 1.5m higher than the bottom end of the condensate collection tank 7; a first flexible connecting air duct 21 is also provided between the eccentric reducer 8 and the air inlet of the exhaust fan 9; and a second flexible connecting air duct 22 is also provided between the air outlet of the exhaust fan 9 and the concentric reducer 10.
[0035] Specifically, the exhaust fan 9 is installed on a concrete foundation or steel platform on the ground in a factory building or outdoors. The elevation of the bottom end of the exhaust fan 9 inlet should be more than 1.50m higher than the bottom end of the condensate collection tank 7, which is conducive to the flow and collection of a small amount of condensate generated in the steam condensate separator 4. The exhaust fan 9 can be selected as a centrifugal exhaust fan 9, which is low-noise and runs smoothly. A first flexible connecting air duct 21 and an eccentric reducer 8 are provided on the inlet side of the exhaust fan 9, and a second flexible connecting air duct 22 and a concentric reducer 10 are provided on the outlet side of the exhaust fan 9. The exhaust fan 9 outlet is connected to the fan outlet exhaust duct 11 to discharge the humid air to a safe place.
[0036] To sum up, the utility model is provided with a local exhaust hood 1, an exhaust branch pipe 2, an exhaust main pipe 3, a steam condensate separator 4, a primary separation screen 5, a secondary separation plate 6, a condensate collecting tank 7, an eccentric reducer 8, an exhaust fan 9, a concentric reducer 10, and a fan outlet exhaust pipe 11; the air outlet of the local exhaust hood 1 is connected to the exhaust branch pipe 2, the exhaust branch pipe 2 is connected to the exhaust main pipe 3; the exhaust main pipe 3 is connected to the steam condensate separator 4; a primary separation screen 5 and a secondary separation plate 6 are provided inside the steam condensate separator 4; the first outlet of the steam condensate separator 4 is connected to the condensate collecting tank 7; the second outlet of the steam condensate separator 4 is connected to the eccentric reducer 8; the eccentric reducer 8 is connected to the air inlet of the exhaust fan 9, the air outlet of the exhaust fan 9 is connected to the concentric reducer 10, and the concentric reducer 10 is connected to the fan outlet exhaust pipe 11. The local exhaust hood 1 adopts a receiving type exhaust hood, which is arranged above the equipment that emits water vapor in a concentrated manner. The specific connection form can be a single exhaust branch pipe 2 connected to a conical local exhaust hood 1, or two exhaust branch pipes 2 connected to a triangular local exhaust hood 1. The hood opening control wind speed of the local exhaust hood 1 is 0.6m / s-1m / s. The exhaust volume of the local exhaust hood 1 is determined according to the hood opening control wind speed, the needs of the process equipment and the hood opening cross-sectional size. Among them, the exhaust branch pipe 2 can be a circular air duct or a rectangular air duct. The local exhaust hood 1 and the exhaust branch pipe 2 are connected by a flange. Each exhaust branch pipe 2 is provided with a split multi-page regulating air valve 12 above the local exhaust hood 1 to adjust the air volume of the local exhaust hood 1 and the corresponding exhaust branch pipe 2 to maintain the air volume balance of the entire local exhaust system. In the steam condensate separator 4, because the density and inertia of condensate are much greater than those of air, the majority of the steam condensate flows vertically into the condensate collection tank 7 under the influence of flow inertia and gravity. It then flows through a stainless steel drain pipe 16 to a drain ditch 18. The primary separation screen 5 provides adhesion, preventing a small amount of condensate from being carried along by the airflow into the exhaust fan 9. The primary separation screen 5 is made of 5-10 mesh stainless steel. After initial separation by the primary separation screen 5, a small amount of condensate enters the secondary separation plate 6 under the negative pressure of the exhaust fan 9. By changing the flow cross-section and flow angle, the airflow first enters this element at a 45-degree angle downward. The gaseous air and water vapor then return and flow upward at a 45-degree angle out of the secondary separation plate 6, entering the exhaust fan 9. The small amount of liquid condensate carried along the guide vanes 20 collects at the bottom, then flows into the condensate collection tank 7, and then drains into the drain ditch through the stainless steel drain pipe 16. The welds between the drain pipe 16 and the guide vanes 20 must be secure to ensure the structural stability of the secondary separation plate 6. The plunger valve 17 at the end of the drain pipe 16 has sealing and shutoff functions.The utility model can properly and reasonably organize the exhaust airflow, effectively remove the steam concentratedly generated in the functional sections of the equipment in the industrial plant, effectively remove the waste heat and moisture emitted in the plant, improve the production environment inside the plant and the occupational health conditions of the operators, and improve the product quality; and effectively isolate the steam condensate generated in the exhaust process from the mainstream air, reduce the amount of condensate entering the exhaust fan 9, reduce the liquid impact damage to the fan blades under the action of the centrifugal force of the exhaust fan 9, and thus increase the service life of the exhaust fan 9.
[0037] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.
Claims
1. A local exhaust system for separating steam condensate, characterized in that: It comprises a local exhaust hood (1), an exhaust branch pipe (2), an exhaust main pipe (3), a steam condensate separation element (4), a primary separation screen (5), a secondary separation plate (6), a condensate collection tank (7), an eccentric reducer (8), an exhaust fan (9), a concentric reducer (10), and an exhaust pipe (11) at the fan outlet; The air outlet of the local exhaust hood (1) is connected to the exhaust branch pipe (2), and the exhaust branch pipe (2) is connected to the exhaust main pipe (3); the exhaust main pipe (3) is connected to the steam condensate separator (4); the steam condensate separator (4) is provided with the primary separation screen (5) and the secondary separation plate (6) inside; the first outlet of the steam condensate separator (4) is connected to the condensate collecting tank (7); the second outlet of the steam condensate separator (4) is connected to the eccentric reducer (8); the eccentric reducer (8) is connected to the air inlet of the exhaust fan (9), the air outlet of the exhaust fan (9) is connected to the concentric reducer (10), and the concentric reducer (10) is connected to the fan outlet exhaust pipe (11).
2. A local exhaust system for separating steam condensate according to claim 1, characterized in that: The combination of the local exhaust hood (1) and the exhaust branch pipe (2) is as follows: a single exhaust branch pipe (2) is connected to the conical local exhaust hood (1) at the bottom.
3. A local exhaust system for separating steam condensate according to claim 1, characterized in that: The combination of the local exhaust hood (1) and the exhaust branch pipe (2) is as follows: two exhaust branch pipes (2) are connected to a triangular local exhaust hood (1).
4. A local exhaust system for separating steam condensate according to claim 1, characterized in that: The exhaust branch pipe (2) is a circular air duct or a rectangular air duct, and the local exhaust hood (1) and the exhaust branch pipe (2) are connected by a flange; each exhaust branch pipe (2) is provided with a split multi-leaf regulating air valve (12) above the local exhaust hood (1).
5. The local exhaust system for separating steam condensate according to claim 1, characterized in that: The exhaust main pipe (3) is connected to the steam heating box outlet (13) through an exhaust branch pipe (2); the exhaust main pipe (3) is provided with an exhaust pipe elbow (14).
6. A local exhaust system for separating steam condensate according to claim 1, characterized in that: The bottom of the condensate collecting tank (7) is connected to a condensate receiving funnel (15), the bottom of the condensate receiving funnel (15) is connected to a drain pipe (16), the drain pipe (16) is provided with a plunger valve (17), and the outlet of the drain pipe (16) is led to a drainage ditch (18).
7. The local exhaust system for separating steam condensate according to claim 1, characterized in that: The secondary separation plate (6) comprises a wire mesh shell (19), a guide plate (20) is welded inside the wire mesh shell (19), and the guide plate (20) is inclined toward the bottom of the wire mesh shell (19).
8. The local exhaust system for separating steam condensate according to claim 1, characterized in that: A first flexible connecting air duct (21) is further provided between the eccentric reducer (8) and the air inlet of the exhaust fan (9); and a second flexible connecting air duct (22) is further provided between the air outlet of the exhaust fan (9) and the concentric reducer (10).
9. The local exhaust system for separating steam condensate according to claim 1, characterized in that: The exhaust fan (9) is installed on a concrete foundation or a steel platform on the ground in a factory building or outdoors; the elevation of the bottom end of the exhaust fan (9) inlet is more than 1.5m higher than the bottom end of the condensate collecting tank (7).