Water hammer preventing device for condensate recovery system pipeline
By introducing nitrogen into the condensate collection tank to control the pressure, the water hammer problem caused by condensate flash evaporation was solved, achieving stable collection and efficient utilization of condensate, and enhancing the system's safety and condensate utilization rate.
Patent Information
- Application Number
- CN202520603082.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2026-01-16
- Estimated Expiration
- 2035-04-01
AI Technical Summary
In existing condensate recovery systems, condensate is prone to flash evaporation before entering the condensate tank, leading to water hammer, which can damage pipelines and equipment. Furthermore, existing technologies rely on flash tanks and multiple valves, which have high requirements.
By introducing nitrogen to regulate the pressure inside the condensate collection tank, the condensate is kept in a liquid state to avoid condensate mixing and flash evaporation. A nitrogen pressure-replenishing valve group and pressure control device are used to ensure stable pressure inside the condensate collection tank.
It effectively avoids the water hammer effect, improves the utilization rate of condensate, and can be used for heat exchange in downstream equipment, thus enhancing the safety and stability of the system.
Smart Images
Figure CN223807040U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to condensate recovery system technical field, concretely relates to a condensate recovery system pipeline water hammer device. BACKGROUND
[0002] It is known that condensate recovery system is responsible for recovering steam condensate, but the condensate temperature produced by different devices is different, therefore, the condensate is easy to flash in the pipeline before entering the condensate tank, further leading to serious condensate system water hammer, and the water hammer can damage the pipeline, pipe fittings and equipment, affecting normal production, so effective measures need to be taken to prevent and solve this problem to ensure the safe operation of condensate recovery system.
[0003] CN217287225U discloses a kind of steam condensate recovery system for multi-level steam condensate pipe network, high-pressure steam condensate is decompressed and flashed by flash tank, gas phase and liquid phase are separated, gas phase is accessed to low-pressure steam pipeline by check valve, liquid phase is introduced into low-pressure condensate pipeline, and multiple level guide pipe line, valve and drain device are configured to prevent backflow and water hammer effect, the system solves the water hammer problem caused by gasification of high-pressure condensate in low-pressure pipe network, ensures the safety of pipe network, recovers steam and condensate at the same time, avoids direct discharge waste, but its operation mainly relies on flash tank and multiple valves, and the requirement for valve and pipe line is higher. UTILITY MODEL CONTENT
[0004] The utility model aims at overcoming the defects in prior art, provide condensate recovery system pipeline water hammer device, by introducing nitrogen, control condensate keeps liquid state, avoid the water hammer effect caused by the flash of multiple condensate, and the condensate after recovery can be used for heat exchange of other downstream equipment, improve the utilization rate of condensate.
[0005] The condensate recovery system pipeline water hammer device, including condensate collection tank, condensate collection tank top is connected with device condensate main pipe and other device condensate pipe line respectively, condensate collection tank bottom is provided with the pipe line being connected with condensate pump, condensate collection tank bottom is also provided with safety discharge pipe line A, for the safety discharge of condensate in condensate collection tank when equipment failure;Condensate pump outlet is provided with three branches, first branch is connected with heat exchanger A, second branch is the pipe line backflowing to condensate collection tank, third branch is connected with safety discharge pipe line B;Heat exchanger A is connected with water treatment device, and pressure gauge is arranged on connecting pipe line.
[0006] Preferably, the condensate collection tank top is provided with a pressure relief device and a pressure gauge, and a liquid level meter is arranged on the side wall.
[0007] Preferably, the condensate collection tank top is also provided with a pipe line connected with heat exchanger B, and the heat exchanger B bottom is provided with a pipe line backflowing to the condensate collection tank.
[0008] Preferably, the top of the condensate collection tank is connected with a nitrogen pipeline, and a nitrogen pressure compensation valve group is arranged on the nitrogen pipeline, which is composed of a pressure reducing valve, a check valve and a back pressure valve.
[0009] Preferably, the condensate pump outlet is provided with a pressure gauge, and further, the pressure gauge is located on the main pipeline before the condensate pump outlet is branched.
[0010] Specifically, the working principle of the condensate recovery system pipeline water hammer device is as follows: different devices require different steam purposes and different process temperatures, resulting in steam condensate with different temperatures and pressures. The steam condensate at different positions is transported to the condensate collection tank through the device condensate main pipe and other device condensate pipelines. Due to the different temperatures of the condensate, the condensate collection tank controls the pressure in the tank to ensure that the condensate in the tank is in a liquid state. This process is mainly realized by nitrogen pressurization. The required pressure in the condensate collection tank is 0.15 MPa, and the 0.7 MPa nitrogen in the nitrogen pipeline network enters the device nitrogen pipeline after being reduced, and then enters the condensate collection tank through the nitrogen pressure compensation valve group. The working principle of the nitrogen pressure compensation valve group is as follows: the inlet pressure reducing valve ensures the stability of the inlet pressure of the nitrogen pressure compensation valve group, avoiding the influence of pipeline network pressure fluctuation on the adjustment accuracy of the back pressure valve. The back pressure valve is pre-adjusted to a specific opening, and the spring force and the pressure in the condensate collection tank form a dynamic balance. When the tank pressure is 0.15 MPa, the valve core is in a critical closed state, and at this time, nitrogen does not enter the tank. When the tank pressure exceeds the set value, the force acting on the diaphragm of the back pressure valve overcomes the spring pre-tightening force, pushing the valve core to completely close, cutting off the nitrogen inflow path. When the tank pressure is less than the set value, the spring force dominates, the valve core opens, and nitrogen enters the condensate collection tank through the nitrogen pressure compensation valve group until the tank pressure returns to the set value. At the same time, the condensate collection tank is equipped with a pressure gauge and a pressure relief device to monitor the tank pressure in real time and trigger the pressure relief device when the pressure is too high. In addition, the condensate collection tank is equipped with a heat exchanger to further reduce the temperature difference caused by the mixing of condensate at different temperatures, ensure the uniform temperature of the mixed condensate, and maintain the stability of the tank.
[0011] The condensate in the condensate collection tank is transported to the required heat exchange device by the bottom condensate pump. Since the condensate has a certain temperature, it can enter the downstream device heat exchanger A for heat exchange, and then enter the water treatment device for subsequent treatment after the heat exchange is completed. In order to prevent the mixing of materials into the condensate due to abnormal device pressure and leakage of heat exchanger tube bundle during the early heat exchange process, which may cause pollution of the condensate water quality and affect the downstream water treatment device, leading to unstable operation of the device, a safety discharge pipeline is arranged after the condensate collection tank and the condensate pump.
[0012] Compared with the prior art, the beneficial effects of the utility model are: the condensate recovery system pipeline water hammer device of the utility model does not need to carry out subsequent gas-liquid separation, nitrogen is introduced in the condensate collection stage, nitrogen pressure compensation valve group and condensate collection tank pressure form joint control, make the condensate in the condensate collection tank keep liquid state, avoid the water hammer effect caused by the flashing of multiple condensates, and the recovered condensate can be used for heat exchange of other downstream equipment, improving the utilization rate of condensate. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is the structure schematic diagram of the condensate recovery system pipeline water hammer device of the utility model.
[0014] In the drawing: 1, condensate collection tank;2, condensate pump;3, heat exchanger A;4, heat exchanger B;5, water treatment device;6, safety discharge pipeline A;7, safety discharge pipeline B;8, pressure relief device;9, liquid level meter;10, pressure gauge;11, device condensate main pipe;12, other device condensate pipeline;13, nitrogen pressure compensation valve group;14, nitrogen pipeline. DETAILED DESCRIPTION
[0015] The specific technical scheme of the utility model is further explained below in combination with the drawings.
[0016] As shown in Figure 1 The condensate recovery system pipeline water hammer device includes condensate collection tank 1, the top of condensate collection tank 1 is connected with device condensate main pipe 11, and the bottom is provided with pipeline connected with condensate pump 2;The outlet of condensate pump 2 is provided with pipeline connected with heat exchanger A 3, and heat exchanger A 3 is connected with water treatment device 5;The top of condensate collection tank 1 is connected with nitrogen pipeline 14.
[0017] The top of condensate collection tank 1 is connected with other device condensate pipeline 12;The top of condensate collection tank 1 is provided with pressure relief device 8 and pressure gauge 10, the sidewall is provided with liquid level meter 9, and the bottom is provided with safety discharge pipeline A 6.
[0018] The top of condensate collection tank 1 is also provided with pipeline connected with heat exchanger B 4, and the bottom of heat exchanger B 4 is provided with pipeline returning to condensate collection tank 1.
[0019] Nitrogen pressure compensation valve group 13 is arranged on nitrogen pipeline 14, and nitrogen pressure compensation valve group 13 is composed of pressure reducing valve, check valve and back pressure valve.
[0020] The outlet of condensate pump 2 is provided with pipeline returning to condensate collection tank 1 and safety discharge pipeline B 7;Pressure gauge 10 is arranged on the outlet pipeline of condensate pump 2 for detecting the pressure in the pipeline.
[0021] The heat exchanger A3 is provided with a pressure gauge 10 on the pipeline connected with the water treatment device 5.
[0022] Specifically, the working principle of the condensate recovery system pipeline water hammer device is as follows: different devices require different steam purposes and different process temperatures, and steam condensate with different temperatures and pressures is generated, the steam condensate at different positions is transported to the condensate collection tank 1 through the device condensate main pipe 11 and other device condensate pipelines 12, the condensate collection tank 1 controls the pressure in the tank to ensure that the condensate in the tank is in a liquid state due to different condensate temperatures, and this process is mainly realized by nitrogen pressurization; the required pressure in the condensate collection tank 1 is 0.15 MPa, the nitrogen in the nitrogen pipe network with a pressure of 0.7 MPa enters the device nitrogen pipeline 14 after being reduced, and then enters the condensate collection tank 1 through the nitrogen pressure compensation valve group 13; the working principle of the nitrogen pressure compensation valve group 13 is as follows: the inlet pressure reducing valve ensures the stable pressure at the inlet of the nitrogen pressure compensation valve group 13 to avoid the influence of pressure fluctuation in the pipe network on the adjustment accuracy of the back pressure valve, the back pressure valve is pre-adjusted to a specific opening degree, the spring force and the pressure in the condensate collection tank 1 form a dynamic balance, when the pressure in the tank is 0.15 MPa, the valve core is in a critical closed state, at this time, nitrogen does not enter the tank; when the pressure in the tank exceeds the set value, the force acting on the diaphragm of the back pressure valve overcomes the spring pre-tightening force, pushes the valve core to be completely closed, and cuts off the nitrogen inflow path; when the tank pressure is less than the set value, the spring force dominates, the valve core is opened, nitrogen enters the condensate collection tank 1 through the nitrogen pressure compensation valve group 13, and the tank pressure is restored to the set value. At the same time, the condensate collection tank 1 is equipped with a pressure gauge 10 and a pressure relief device 8 to monitor the tank pressure in real time and trigger the pressure relief device 8 when the pressure is too high. Secondly, the condensate collection tank 1 is matched with a heat exchanger B4 to further reduce the temperature difference caused by the mixing of condensate with different temperatures, ensure the uniform temperature of the mixed condensate, and maintain the stability of the tank.
[0023] The condensate in the condensate collection tank 1 is transported to the required heat exchange device through the bottom condensate pump 2, the condensate has a certain temperature and can enter the downstream device heat exchanger A3 for heat exchange to provide heat for other devices requiring heat, and then enters the water treatment device 5 for subsequent treatment; in order to prevent the mixing of materials into the condensate due to abnormal device pressure and the leakage of heat exchanger tube bundle in the early heat exchange process, which pollutes the condensate and affects the downstream water treatment device, causing unstable operation of the device, the safety discharge pipeline A6 and the safety discharge pipeline B7 are arranged behind the condensate collection tank 1 and the condensate pump 2.
Claims
1. A water hammer mitigation device for a line of a condensate recovery system, the water hammer mitigation device comprising: The condensate collecting tank (1) is connected with the device condensate main pipe (11) at the top and is provided with a pipeline connected with the condensate pump (2) at the bottom; the outlet of the condensate pump (2) is provided with a pipeline connected with the heat exchanger A (3), and the heat exchanger A (3) is connected with the water treatment device (5); the top of the condensate collecting tank (1) is connected with the nitrogen pipeline (14).
2. The condensate recovery system line water hammer mitigation device of claim 1, wherein, The top of the condensate collecting tank (1) is connected with other device condensate pipelines (12); the top of the condensate collecting tank (1) is provided with a pressure relief device (8) and a pressure gauge (10), and a liquid level meter (9) is arranged on the side wall, and the bottom is provided with a safety discharge pipeline A (6).
3. The condensate recovery system line water hammer mitigation device of claim 1, wherein, The top of the condensate collecting tank (1) is further provided with a pipeline connected with the heat exchanger B (4), and the bottom of the heat exchanger B (4) is provided with a pipeline returning to the condensate collecting tank (1).
4. The condensate recovery system line water hammer mitigation device of claim 1, wherein, The nitrogen pipeline (14) is provided with a nitrogen pressure compensation valve group (13), which is composed of a pressure reducing valve, a check valve and a back pressure valve.
5. The condensate recovery system line water hammer mitigation device of claim 1, wherein, The outlet of the condensate pump (2) is provided with a pipeline returning to the condensate collecting tank (1) and a safety discharge pipeline B (7); a pressure gauge (10) is arranged on the outlet pipeline of the condensate pump (2) for detecting the pressure in the pipeline.
6. The condensate recovery system line water hammer mitigation device of claim 1, wherein, The pipeline connected with the water treatment device (5) of the heat exchanger A (3) is provided with a pressure gauge (10).