Preheating system for reducing take-off of steam safety valve
By moving the safety valve and adding a steam trap in the steam system, the problem of frequent safety valve tripping was solved, improving equipment safety and environmental comfort, and reducing energy waste and the risk of burns.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU NANQIAO FOOD
- Filing Date
- 2025-04-09
- Publication Date
- 2026-04-21
AI Technical Summary
In existing steam systems, frequent tripping of safety valves leads to wasted steam energy, risk of scalding, and environmental problems. Furthermore, when heat exchangers are shut down, condensate buildup can cause water hammer or localized high pressure.
In the steam system, the safety valve is moved downstream of the shut-off valve and control valve, and a second and third steam trap are added. Steam delivery is monitored by a controller and temperature sensor. The pressure relief pipe is moved outdoors to drain condensate, reducing ineffective tripping and condensate accumulation.
It effectively reduces the ineffective activation of safety valves, protects equipment safety, extends service life, improves working environment comfort, and reduces energy waste and the risk of burns.
Smart Images
Figure CN224150699U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of steam preheating systems, specifically a preheating system that reduces the tripping of steam safety valves. Background Technology
[0002] A steam heat exchange system is a device that uses steam as a heat source to transfer heat energy to a process medium (such as water, air, or oil) through a heat exchanger (such as a shell-and-tube type or a plate type). The steam releases its latent heat in the heat exchanger and then condenses into water, achieving efficient heat transfer. It is widely used in heating, industrial heating, and drying applications.
[0003] In current steam systems, safety valves are typically installed after pressure-reducing valves and before shut-off valves. When the downstream heat exchanger stops using steam, the shut-off valve closes, causing the steam pressure in the pipeline between the pressure-reducing valve and the shut-off valve to gradually rise. Once the pressure exceeds the safety valve's set value, the safety valve will trip, directly venting steam into the workshop's drainage ditch. This design causes frequent tripping of the safety valve, resulting in wasted steam energy. Furthermore, the vent being located inside the workshop poses a risk of burns and can cause environmental problems (high temperature, personnel discomfort). Utility Model Content
[0004] The purpose of this invention is to provide a preheating system that reduces the tripping of steam safety valves, thereby solving the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] A preheating system for reducing steam safety valve tripping includes:
[0007] The pipeline has steam introduced into one side and is delivered to a pressure reducing valve and a control valve via a controller. The steam is then delivered to a heat exchanger via a controller. The heat exchanger outlet is discharged into a drainage ditch via a first drain valve. A second drain valve and a third drain valve are installed on both sides of the pressure reducing valve. A safety valve is installed on the pipeline at the rear end of the control valve. The control valve is connected to the heat exchanger via a controller and a temperature sensor to control the steam delivery switch.
[0008] Preferably, the safety valve has a starting pressure ≥ 4 bar, a pressure relief pipe is fixedly connected to the safety valve, a pressure relief port is provided at the end of the pressure relief pipe, and the pressure relief port leads to the trench.
[0009] Preferably, the steam pressure at the steam inlet of the pipeline is 8 bar, and the steam pressure at the heat exchanger is 3.5 bar.
[0010] Preferably, a shut-off valve is provided in front of the control valve pipeline to cut off the steam supply when the temperature reaches the set value.
[0011] Preferably, pressure gauges are installed on both sides of the pressure reducing valve, and a shut-off valve and a filter are installed at the front end of the pressure gauge at the steam inlet of the pipeline.
[0012] Preferably, a first ball valve is provided on one side of the first drain valve pipe.
[0013] Preferably, a second ball valve and a third ball valve are distributed on one side of the pipeline of the second and third steam traps.
[0014] Preferably, the third and second drain valves are directed to the drainage ditch for discharge.
[0015] Compared with the prior art, the beneficial effects of this utility model are:
[0016] This invention eliminates the problem of ineffective safety valve tripping by moving the safety valve to the shut-off valve and control valve, thereby reducing the pressure in the pipeline behind the shut-off valve to zero when the heat exchanger stops. Secondly, during normal operation of the heat exchanger, the safety valve directly monitors the inlet pressure of the heat exchanger, protecting the heat exchanger's operational safety. Furthermore, by relocating the pressure relief pipe of the safety valve to the outdoors, the risk of burns is mitigated, and the comfort of the working environment is improved.
[0017] This invention adds a second and a third steam trap before and after the pressure reducing valve. After the steam in the pipeline is depressurized, condensate is generated and accumulated. The second and third steam traps can quickly drain the accumulated condensate in the pipeline, protect the equipment, and extend its service life. Attached Figure Description
[0018] Figure 1 This is a structural diagram of the present invention before the CIP preheating modification;
[0019] Figure 2 This is a structural diagram of the CIP preheating modification of this utility model.
[0020] In the diagram: 1-pipeline; 2-stop valve; 3-filter; 4-pressure gauge; 5-pressure reducing valve; 6-safety valve; 601-pressure relief pipe; 602-pressure relief port; 7-shut-off valve; 8-control valve; 9-controller; 10-temperature sensor; 11-heat exchanger; 12-first steam trap; 13-first ball valve; 14-second steam trap; 1401-second ball valve; 15-third steam trap; 1501-third ball valve. Detailed Implementation
[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0022] Example:
[0023] Please see Figures 1 to 2 This utility model provides a technical solution:
[0024] Figure 1 This is a structural diagram of the CIP preheating system before the modification. Before the modification, safety valve 6 was installed after pressure reducing valve 5 and before shut-off valve 7. Steam entered from the steam inlet in front of pipeline 1, passed through shut-off valve 2, was filtered by filter 3, and pressure reduced by pressure reducing valve 5, reducing the upstream high-pressure steam (e.g., 8 bar) to a safe operating pressure (e.g., 3.5 bar). This ensured that downstream equipment (heat exchanger 11, pipeline 1, etc.) operated within the rated pressure range, reducing the risk of overpressure from the source. When heat exchanger 11 was not using steam, shut-off valve 7 was closed. At this time, the pressure between shut-off valve 7 and pressure reducing valve 5 gradually increased. When the pressure was >4.5 bar, safety valve 6 opened. Safety valve 6 discharged steam to the workshop trench through pressure relief pipe 601 and pressure relief port 602. Due to the rapid pressure rise, steam safety valve 6 needed to frequently open to discharge steam, resulting in steam waste. Furthermore, the steam discharged from pressure relief port 602 of safety valve 6 into the workshop caused the workshop temperature to rise, affecting the comfort of the staff. In addition, the steam discharge posed a risk of burns and could easily cause safety accidents.
[0025] Furthermore, the first drain valve 12 is only installed at the outlet of heat exchanger 11. After the shut-off valve 7 is closed, water hammer or local high pressure may be caused by the accumulation of condensate before and after the pressure reducing valve 5.
[0026] A preheating system for reducing steam safety valve tripping includes:
[0027] Pipeline 1, through which steam is introduced, is delivered to pressure reducing valve 5 and control valve 8 via pipeline 1 and controlled by controller 9 to be delivered to heat exchanger 11. The heat exchange outlet of heat exchanger 11 is discharged into a drainage ditch via first drain valve 12. A second drain valve 14 and a third drain valve 15 are provided on both sides of pressure reducing valve 5. A safety valve 6 is provided on pipeline 1 at the rear end of control valve 8. Control valve 8 is connected to heat exchanger 11 via controller 9 and temperature sensor 10 and is used to control the steam delivery switch.
[0028] In this embodiment, the safety valve 6 is moved to the rear of the shut-off valve 7 and the control valve 8, and in front of the heat exchanger 11. Steam enters from the steam inlet in front of the pipeline 1, passes through the shut-off valve 2, is filtered by the filter 3, and is depressurized by the pressure reducing valve 5, reducing the upstream high-pressure steam (e.g., 8 bar) to a safe operating pressure (e.g., 3.5 bar). This ensures that the downstream equipment (heat exchanger 11, pipeline 1, etc.) operates within the rated pressure range, reducing the risk of overpressure from the source. When the downstream heat exchanger 11 does not need steam, the shut-off valve 7 closes, and the pipeline 1 behind the shut-off valve 7 no longer accumulates pressure. The safety valve 6 will not ineffectively trip, reducing pressure waste.
[0029] By moving the safety valve 6, firstly, when the heat exchanger 11 is shut down, the pressure in the pipe 1 downstream of the shut-off valve 7 is reduced to zero, eliminating the ineffective tripping of the safety valve 6; secondly, during normal operation, the safety valve 6 directly monitors the inlet pressure of the heat exchanger 11 (working pressure 3.5 bar, tripping pressure ≥ 4 bar), protecting the safe operation of the heat exchanger 11; finally, the pressure relief pipe 601 of the safety valve 6 is moved outdoors to resolve the risk of burns and improve the comfort of the working environment.
[0030] Specifically, the safety valve 6 has a starting pressure ≥ 4 bar, a pressure relief pipe 601 is fixedly connected to the safety valve 6, and a pressure relief port 602 is provided at the end of the pressure relief pipe 601, which leads to the trench.
[0031] Specifically, the steam pressure at the steam inlet of pipe 1 is 8 bar, and the steam pressure at the heat exchanger 11 connected to pipe 1 is 3.5 bar.
[0032] Specifically, a shut-off valve 7 is provided in front of the control valve 8 pipeline 1 to cut off the steam supply when the temperature reaches the set value.
[0033] Specifically, pressure gauges 4 are installed on both sides of the pressure reducing valve 5 and on the pipes 1. A shut-off valve 2 and a filter 3 are installed at the front end of the pressure gauges 4 at the steam inlet of the pipe 1.
[0034] In this embodiment, a second steam trap 14 and a third steam trap 15 are added before and after the pressure reducing valve 5. When 8 bar high-pressure steam enters the pipeline 1, the 8 bar high-pressure steam is reduced to 3.5 bar by the pressure reducing valve 5 and undergoes adiabatic expansion. Some of the steam condenses due to supercooling. Secondly, during the transportation of steam in the pipeline 1, heat is dissipated to the environment through the pipe wall. When the temperature drops below the dew point, condensate will form. The accumulation of condensate can cause water hammer or local high pressure. The second steam trap 14 and the third steam trap 15 can quickly drain the accumulated condensate, protect the equipment safety, and extend its service life.
[0035] Specifically, a first ball valve 13 is provided on one side of the first drain valve 12 pipe 1.
[0036] Specifically, a second ball valve 1401 and a third ball valve 1501 are respectively installed on one side of the pipe 1 of the second steam trap 14 and the third steam trap 15.
[0037] Specifically, the third drain valve 15 and the second drain valve 14 are directed to the drainage ditch for discharge.
[0038] In use, the safety valve 6 is moved to the rear of the shut-off valve 7 and the control valve 8, and in front of the heat exchanger 11. Steam enters from the steam inlet in front of the pipeline 1, passes through the shut-off valve 2, is filtered by the filter 3, and is depressurized by the pressure reducing valve 5, reducing the upstream high-pressure steam (e.g., 8 bar) to a safe operating pressure (e.g., 3.5 bar). This ensures that downstream equipment (heat exchanger 11, pipeline 1, etc.) operates within the rated pressure range, reducing the risk of overpressure from the source. When the downstream heat exchanger 11 does not need steam, the shut-off valve 7 closes, and the pipeline 1 behind the shut-off valve 7 no longer accumulates pressure. The safety valve 6 will not trip ineffectively, reducing pressure waste.
[0039] By moving the safety valve 6, firstly, when the heat exchanger 11 is shut down, the pressure in the pipe 1 downstream of the shut-off valve 7 is reduced to zero, eliminating the ineffective tripping of the safety valve 6; secondly, during normal operation, the safety valve 6 directly monitors the inlet pressure of the heat exchanger 11 (working pressure 3.5 bar, tripping pressure ≥ 4 bar), protecting the safe operation of the heat exchanger 11; finally, the pressure relief pipe 601 of the safety valve 6 is moved outdoors to resolve the risk of burns and improve the comfort of the working environment.
[0040] A second steam trap 14 and a third steam trap 15 are added before and after the pressure reducing valve 5. When 8 bar high-pressure steam enters pipe 1, the 8 bar high-pressure steam is reduced to 3.5 bar by the pressure reducing valve 5 and undergoes adiabatic expansion. Some of the steam condenses due to supercooling. Secondly, during the transportation of steam in pipe 1, heat is dissipated to the environment through the pipe wall. When the temperature drops below the dew point, condensate will form. The accumulation of condensate can cause water hammer or local high pressure. The second steam trap 14 and the third steam trap 15 can quickly drain the accumulated condensate, protect the equipment safety, and extend its service life.
[0041] All other parts of this utility model not described herein are the same as existing technologies, or are known technologies, or can be implemented using existing technologies, and will not be described in detail here.
[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A preheating system to reduce kick-off of a steam safety valve, characterized by, include: A pipe (1) is provided, through which steam is introduced. The steam is delivered to a pressure reducing valve (5) and a control valve (8) via a controller (9) and then delivered to a heat exchanger (11). The heat exchange outlet of the heat exchanger (11) is discharged into a drainage ditch via a first drain valve (12). A second drain valve (14) and a third drain valve (15) are provided on both sides of the pressure reducing valve (5). A safety valve (6) is provided on the pipe (1) at the rear end of the control valve (8). The control valve (8) is connected to the heat exchanger (11) via a controller (9) and a temperature sensor (10) and is used to control the steam delivery switch.
2. A preheating system for reducing kick-off of a steam safety valve according to claim 1, characterized in that: The safety valve (6) has a starting pressure ≥ 4 bar. A pressure relief pipe (601) is fixedly connected to the safety valve (6). A pressure relief port (602) is provided at the end of the pressure relief pipe (601), and the pressure relief port (602) leads to the trench.
3. A preheating system for reducing kick-off of a steam safety valve according to claim 1, characterized in that: The steam inlet of the pipe (1) is supplied with steam at a pressure of 8 bar, and the steam pressure supplied to the heat exchanger (11) through the pipe (1) is 3.5 bar.
4. A pre-heat system to reduce kick-off of a steam safety valve according to claim 1, wherein: A shut-off valve (7) is installed in front of the control valve (8) pipeline (1).
5. A preheating system for reducing kick-off of a steam safety valve according to claim 1, characterized in that: Pressure gauges (4) are installed on both sides of the pressure reducing valve (5) and the front end of the pressure gauge (4) is equipped with a shut-off valve (2) and a filter (3) at the steam inlet of the pipe (1).
6. A pre-heat system to reduce kick-off of a steam safety valve according to claim 1, wherein: A first ball valve (13) is provided on one side of the first drain valve (12) pipe (1).
7. A pre-heat system to reduce kick-off of a steam safety valve according to claim 1, wherein: The second steam trap (14) and the third steam trap (15) are provided with a second ball valve (1401) and a third ball valve (1501) on one side of the pipe (1).
8. A pre-heat system to reduce kick-off of a steam safety valve according to claim 7, wherein: The third drain valve (15) and the second drain valve (14) lead to the drainage ditch for discharge.