Safe and stable closed condensate water vapor recycling system

Abstract

The utility model belongs to the condensate steam recycling technical field discloses a safe and stable closed condensate steam recycling system. Including condensate recovery tank, the top outlet of condensate recovery tank is connected with the flash steam pipeline, and the flash steam regulating valve is arranged on the flash steam pipeline, the flash steam regulating valve end is incorporated into the low pressure steam pipeline, the bottom outlet of condensate recovery tank is connected with the condensate pump inlet through condensate drain pipeline A, the condensate pump outlet is connected with condensate drain pipeline B, and the backflow pipeline is arranged on condensate drain pipeline B; The backflow regulating valve is arranged on the backflow pipeline; The backflow pipeline is connected with the upper portion of condensate recovery tank; The inlet of condensate recovery tank is connected with the high temperature and high pressure condensate pipeline for the high temperature and high pressure condensate into condensate recovery tank. The steam resources and water resources of condensate can be realized long-distance transportation, the system safety is guaranteed, the operation is stable, the condensate quality is good, and the oxygen corrosion and acid corrosion are eliminated.

Description

Technical Field

[0001] This utility model belongs to the field of condensate steam recovery and utilization technology, and relates to a safe and stable closed condensate steam recovery and utilization system. Background Technology

[0002] Existing condensate recovery systems only recycle condensate, neglecting the utilization of steam during the recovery process. This steam is either directly released into the atmosphere or enters the condensate recovery network through connecting pipes, wasting the flow and heat of this low-pressure steam. Direct release into the atmosphere not only wastes energy but also poses safety hazards. Chinese patent CN210069822U discloses a high-pressure, high-temperature condensate flash recovery system that uses a flash tank to recover high-pressure, high-temperature condensate, generating superheated low-pressure steam that meets user needs and is suitable for long-distance transport. This reduces the temperature and pressure of the condensate recovered from the power plant, making it meet the inlet water requirements of the deaerator and allowing for direct recovery and use. However, this system requires an external unit, increasing the equipment's footprint and investment cost. Furthermore, its practical application suffers from cavitation, and it is only suitable for long-distance steam transport, presenting a long-distance drainage problem. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings in the above-mentioned background technology, in order to ensure that the steam and water resources of condensate can be transported over long distances, reduce equipment investment and floor space, ensure system safety and stable operation, maintain good condensate water quality, eliminate oxygen corrosion and acid corrosion, and provide a safe and stable closed-loop condensate steam recovery and utilization system to achieve the complete recovery of steam and water resources of condensate and save heat source.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: a safe and stable closed-loop condensate steam recovery and utilization system, including a condensate recovery tank; the top outlet of the condensate recovery tank is connected to a flash steam pipe, and a flash steam regulating valve is installed on the flash steam pipe; the end of the flash steam regulating valve is connected to a low-pressure steam pipe; the bottom outlet of the condensate recovery tank is connected to the inlet of the condensate pump through a condensate drain pipe A; the outlet of the condensate pump is connected to a condensate drain pipe B; a return pipe is branched onto the condensate drain pipe B; a return regulating valve is installed on the return pipe; the return pipe is connected to the upper part of the condensate recovery tank; the inlet of the condensate recovery tank is connected to a high-temperature and high-pressure condensate pipe for high-temperature and high-pressure condensate to enter the condensate recovery tank.

[0005] A level gauge is installed in the upper and lower parts of the condensate recovery tank. The two level gauges are connected to a differential pressure level transmitter through pipelines. The differential pressure level transmitter is located externally, and a solenoid valve is installed on each pipeline.

[0006] The condensate recovery tank is connected to a pressure relief pipe at the top, and a safety valve is installed on the pressure relief pipe. A pressure transmitter is also installed on the outer wall of the top of the condensate recovery tank.

[0007] Furthermore, a steam-water separator is installed at the upper part of the condensate recovery tank;

[0008] Furthermore, a hydrocyclone is installed in the middle of the condensate recovery tank;

[0009] Furthermore, the inlet of the condensate recovery tank is located above the hydrocyclone and below the steam-water separator.

[0010] Furthermore, a flow guide is installed at the outlet of the condensate recovery tank.

[0011] Furthermore, the differential pressure level transmitter is linked to the reflux regulating valve.

[0012] Furthermore, the pressure transmitter is linked to the flash steam regulating valve.

[0013] Furthermore, the differential pressure level transmitter is linked to the condensate pump.

[0014] Preferably, the steam-water separator is a UFS series, the cyclone separator is an FX type, and the flow guide is a YQFX4.

[0015] The system is also equipped with a PLC control system. The flash steam regulating valve, reflux regulating valve, condensate pump, level gauge, pressure transmitter, differential pressure level transmitter, solenoid valve, steam-water separator, hydrocyclone, and flow guide are all connected to the PLC control system. There is no restriction on any specific model; the system only needs to achieve its working function.

[0016] The advantages of this utility model compared with the prior art are:

[0017] 1. This utility model incorporates a built-in gas-water separator, reducing equipment investment and floor space requirements.

[0018] 2. This utility model adds a condensate pump, which realizes the long-distance transportation of high-temperature and high-pressure condensate water resources, ensuring the safety and stability of the system.

[0019] 3. This utility model adds a return pipe and a regulating valve that is linked to the tank liquid level to ensure that there are enough injection heads at the condensate pump inlet, avoiding insufficient injection heads and cavitation at the pump inlet, which would cause system instability and damage to the equipment.

[0020] 4. The tank body of this utility model is equipped with a hydrocyclone, a steam-water separator, and a flow guide to ensure the dryness of the flash steam of high-temperature and high-pressure condensate, stabilize the inlet pressure of the condensate pump, and reduce or even avoid cavitation damage to the condensate pump.

[0021] 5. The tank of this utility model is equipped with a safety valve, and the outlet is led to an unoccupied and safe place through a pipeline. When the system exceeds the set pressure, the safety valve opens to ensure the safety and stability of the system. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a schematic diagram of a safe and stable closed-loop condensate steam recovery and utilization system according to this utility model.

[0024] Figure 2 This is a schematic diagram of a condensate recovery tank.

[0025] In the diagram: 1. Condensate recovery tank; 2. Condensate pump; 3. Flash steam regulating valve; 4. Pressure transmitter; 5. Reflux regulating valve; 6. Differential pressure level transmitter; 7. Safety valve; 8. PLC control cabinet; 9. Steam-water separator; 10. High-temperature and high-pressure condensate pipeline; 11. Condensate drain pipeline A; 12. Condensate drain pipeline B; 13. Flash steam pipeline; 14. Low-pressure steam pipeline; 15. Reflux pipeline A; 16. Reflux pipeline B; 17. Pressure relief pipeline; 18. Hydrocyclone; 19. Flow guide. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

[0027] Example 1

[0028] A safe and stable closed-loop condensate steam recovery and utilization system, such as Figure 1 As shown, it includes a condensate recovery tank 1; the top outlet of the condensate recovery tank 1 is connected to a flash steam pipe 13, and a flash steam regulating valve 3 is installed on the flash steam pipe 13; the end of the flash steam regulating valve 3 is connected to a low-pressure steam pipe 14; the bottom outlet of the condensate recovery tank 1 is connected to the inlet of the condensate pump 2 through a condensate drain pipe A11; the outlet of the condensate pump 2 is connected to a condensate drain pipe B12, and the condensate drain pipe B12 is connected to a return pipe; a return regulating valve 5 is installed on the return pipe; the return pipe is connected to the upper part of the condensate recovery tank 1; the inlet of the condensate recovery tank 1 is connected to a high-temperature and high-pressure condensate pipe 10 for high-temperature and high-pressure condensate to enter the condensate recovery tank 1.

[0029] A level gauge is installed in the upper and lower parts of the condensate recovery tank 1. The two level gauges are connected to the differential pressure level transmitter 6 through pipelines. The differential pressure level transmitter 6 is located on the outside, and a solenoid valve is installed on each pipeline.

[0030] The top of the condensate recovery tank 1 is connected to a pressure relief pipe 17, and a safety valve 7 is installed on the pressure relief pipe 17. A pressure transmitter 4 is also installed on the outer wall of the top of the condensate recovery tank 1.

[0031] A steam-water separator 9 is installed at the upper part of the condensate recovery tank 1;

[0032] Condensate recovery tank 1 has a hydrocyclone 18 installed in the middle of its body;

[0033] The inlet of the condensate recovery tank 1 is located above the hydrocyclone 18 and below the steam-water separator 9.

[0034] A flow guide 19 is provided at the outlet of the condensate recovery tank 1.

[0035] The differential pressure level transmitter 6 is linked with the reflux regulating valve 5.

[0036] The pressure transmitter 4 is linked with the flash steam regulating valve 3.

[0037] The differential pressure level transmitter 6 is linked with the condensate pump 2.

[0038] The system is also equipped with a PLC control system. The flash steam regulating valve 3, reflux regulating valve 5, condensate pump 2, level gauge, pressure transmitter 4, differential pressure level transmitter 6, solenoid valve, steam-water separator 9, hydrocyclone 18, and flow guide 19 are all connected to the PLC control system. They are not limited to any specific model, as long as they can achieve their working functions.

[0039] After high-temperature and high-pressure condensate enters the condensate recovery tank 1 through the high-temperature and high-pressure condensate pipeline 10, it undergoes flash evaporation through the hydrocyclone 18. The flash steam then passes through the steam-water separator 9, with dry steam remaining at the top of the tank and saturated condensate falling to the bottom. At this time, the pressure transmitter 4 at the top of the condensate recovery tank 1 detects the pressure inside the tank and, in conjunction with the flash steam regulating valve 3, adjusts the opening of the regulating valve 3, allowing the flash steam to enter the low-pressure steam pipeline 14 through the flash steam pipeline 13 for recycling and reuse, achieving energy conservation while preventing the direct discharge of low-pressure steam into the atmosphere, thus avoiding safety hazards.

[0040] The saturated condensate from the steam-water separator 9 is located at the bottom of the condensate recovery tank 1. At this time, the differential pressure level transmitter 6 detects the liquid level in the condensate recovery tank 1 and is linked with the condensate pump 2 and the reflux regulating valve 5. When the liquid level reaches the high point, the condensate pump 2 starts. The saturated condensate in the tank passes through the guide 19 and the condensate drain pipe A11, which is connected to the inlet of the condensate pump 2. The condensate enters the condensate drain pipe B12 through the condensate pump 2. When the liquid level reaches the set low liquid level range, the reflux regulating valve 5 starts to adjust the opening to ensure sufficient filling head at the inlet of the condensate pump 2 and avoid cavitation at the inlet of the condensate pump 2, which would cause system instability and damage to the equipment. When the liquid level reaches the very low liquid level, the condensate pump 2 stops.

[0041] Meanwhile, the top of the condensate recovery tank 1 is equipped with a safety valve 7 to ensure emergency discharge in case of system failure or overpressure. The discharge is carried out through the pressure relief pipe 17 to an uninhabited safe area.

[0042] The on-site PLC control system centrally controls condensate pump 2, flash steam regulating valve 3, pressure transmitter 4, reflux regulating valve 5, and differential pressure level transmitter 6, so that flash steam regulating valve 3 and condensate pump 2 can stably deliver the recovered flash steam and saturated condensate into the recovery pipeline network, so that the flow and heat of the condensate can be fully recovered and utilized, and the system can operate safely and stably.

[0043] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A safe and stable closed-loop condensate steam recovery and utilization system, characterized in that, The system includes a condensate recovery tank (1); the top outlet of the condensate recovery tank (1) is connected to a flash steam pipe (13), and a flash steam regulating valve (3) is installed on the flash steam pipe (13); the end of the flash steam regulating valve (3) is connected to a low-pressure steam pipe (14); the bottom outlet of the condensate recovery tank (1) is connected to the inlet of the condensate pump (2) through a condensate drain pipe A (11); the outlet of the condensate pump (2) is connected to a condensate drain pipe B (12), and the condensate drain pipe B (12) is connected to a return pipe; a return regulating valve (5) is installed on the return pipe; the return pipe is connected to the upper part of the condensate recovery tank (1); the inlet of the condensate recovery tank (1) is connected to a high-temperature and high-pressure condensate pipe (10) for high-temperature and high-pressure condensate to enter the condensate recovery tank (1).

2. The safe and stable closed-loop condensate steam recovery and utilization system as described in claim 1, characterized in that, A level gauge is installed in the upper and lower parts of the condensate recovery tank (1). The two level gauges are connected to the differential pressure level transmitter (6) through pipelines. The differential pressure level transmitter (6) is installed on the outside, and a solenoid valve is installed on each pipeline.

3. The safe and stable closed-loop condensate steam recovery and utilization system as described in claim 1, characterized in that, The top of the condensate recovery tank (1) is connected to a pressure relief pipe (17), and a safety valve (7) is installed on the pressure relief pipe (17).

4. The safe and stable closed-loop condensate steam recovery and utilization system as described in claim 1, characterized in that, A pressure transmitter (4) is also installed on the top outer wall of the condensate recovery tank (1).

5. The safe and stable closed-loop condensate steam recovery and utilization system as described in claim 1, characterized in that, A steam-water separator (9) is installed at the upper part of the condensate recovery tank (1).

6. The safe and stable closed-loop condensate steam recovery and utilization system as described in claim 1, characterized in that, The condensate recovery tank (1) has a hydrocyclone (18) in the middle of its body.

7. The safe and stable closed-loop condensate steam recovery and utilization system as described in claim 1, characterized in that, The inlet of the condensate recovery tank (1) is located above the hydrocyclone (18) and below the steam-water separator (9).

8. The safe and stable closed-loop condensate steam recovery and utilization system as described in claim 1, characterized in that, The condensate recovery tank (1) is equipped with a flow guide (19) at the tank outlet.

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