Steam condensate closed recovery system

Abstract

The utility model discloses a closed recovery system for steam condensate. The closed recovery system comprises a recovery tank and a softened water tank, a condensate return pipe, a first blow-down pipe and a pressure relief pipe are connected to the top of the recovery tank, a safety valve is arranged on the first blow-down pipe, a first electric valve is arranged at the end, close to the recovery tank, of the pressure relief pipe, and the softened water tank is connected to the end, away from the recovery tank, of the pressure relief pipe; the bottom of the recycling tank is connected with a condensate recycling pipe and a discharging pipe, the condensate recycling pipe is provided with a boiler water feeding pump so as to supply recycled water to the boiler, the discharging pipe is provided with a discharging valve, and the recycling tank is further provided with a first liquid level meter; the lower portion of the softened water tank is connected with a water supplementing pipe, the other end of the water supplementing pipe is connected to the top of the recycling tank, and a water supplementing pump is arranged on the water supplementing pipe. The steam condensate closed recovery system provided by the utility model can automatically adjust and control water balance in the recovery tank, so that the problem that a water feeding pump of a boiler is easy to generate a cavitation phenomenon is solved.

Description

Technical Field

[0001] This utility model relates to the field of condensate recovery technology, and in particular to a closed-loop steam condensate recovery system. Background Technology

[0002] Steam condensate has significant reuse value and is generally recycled.

[0003] In the prior art, such as the invention patent with application number 201510679141.5, a closed-loop steam condensate recovery system is disclosed. This system utilizes the waste heat of steam condensate in stages by setting up a primary steam condensate treatment device and a secondary steam condensate treatment device. The condensate then enters a closed-loop condensate recovery device. The condensate recovered in the closed-loop condensate recovery device is transported to the boiler deaerator, where the high-temperature boiler soft water generated is then used to replenish the boiler. This system can recover and utilize the heat energy in the condensate and reduce the number of blowdowns during the boiler softening water treatment process.

[0004] However, closed-loop condensate recovery devices do not have additional automatic maintenance. During use, internal water imbalance may cause cavitation in the downstream pump, affecting the pump's normal service life. Utility Model Content

[0005] This application provides a closed-loop steam condensate recovery system that can automatically adjust and control the water balance in the recovery tank during the steam condensate recovery process. This can solve the problem of cavitation in boiler feedwater pumps and thus ensure the normal service life of boiler feedwater pumps.

[0006] This application provides a closed-loop steam condensate recovery system, including a recovery tank and a soft water tank;

[0007] The top of the recovery tank is connected to a condensate return pipe, a first vent pipe, and a pressure relief pipe. The first vent pipe is equipped with a safety valve. The pressure relief pipe is equipped with a first electric valve at one end near the recovery tank and connected to the soft water tank at the other end away from the recovery tank. The bottom of the recovery tank is connected to a condensate reuse pipe and a drain pipe. The condensate reuse pipe is equipped with a boiler feed water pump to supply water for boiler reuse. The drain pipe is equipped with a drain valve. The recovery tank is also equipped with a first level gauge.

[0008] The lower part of the soft water tank is connected to a water supply pipe, the other end of which is connected to the top of the recycling tank, and a water supply pump is installed on the water supply pipe.

[0009] In one possible implementation, the condensate return pipe is equipped with a check valve, and the pressure difference of the check valve is ≤500kpa.

[0010] In one possible implementation, the pressure relief pipe is further provided with a steam-water mixer at one end near the soft water tank, and the lower part of the soft water tank is provided with a circulation pipe for connecting the steam-water mixer, and a circulation pump is provided on the circulation pipe.

[0011] In one possible implementation, the water mixer is a jet-type water mixer, a static mixing water mixer, a Venturi-type water mixer, or a vortex-type water mixer.

[0012] In one possible implementation, the top of the soft water tank is also connected to a second vent pipe, the other end of which is connected to the grease trap.

[0013] In one possible implementation, the soft water tank is equipped with a second level gauge, and a soft water supply pipe is connected to the upper part of the soft water tank. A second electric valve is provided on the soft water supply pipe.

[0014] Beneficial effects: Compared with the prior art, the closed-loop steam condensate recovery system provided in this application monitors the water volume in the recovery tank in real time through the first liquid level gauge in the recovery tank. When the liquid level is low, the water supply pump is activated to automatically replenish the water in the soft water tank to the recovery tank. When the liquid level is high, the water supply is automatically stopped, which can ensure the water balance in the recovery tank, that is, always keep it within a reasonable liquid level range. This can avoid cavitation in the boiler feed water pump, thereby ensuring the normal service life of the boiler feed water pump and saving costs.

[0015] The combination of the pressure relief pipe and the first electric valve can automatically relieve pressure in time when the pressure in the recovery tank exceeds the set value. The combination of the first vent pipe and the safety valve can also trigger pressure relief when the pressure in the recovery tank exceeds the preset value or the safety value of the equipment, thus providing double protection for the safety of the recovery tank.

[0016] The combination of circulation pipeline, circulation pump and steam-water mixer can not only stir the water in the soft water tank, but also allow the water in the soft water tank to mix with the depressurized steam in the steam-water mixer at any time, so as to promote the formation of condensate and enter the soft water tank.

[0017] These and other objects, features and advantages of this utility model will be fully realized through the following detailed description. Attached Figure Description

[0018] Figure 1 A schematic diagram of the closed-loop steam condensate recovery system of this application is shown. Detailed Implementation

[0019] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the present invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0020] Those skilled in the art should understand that, in the disclosure of this specification, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this utility model.

[0021] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0022] refer to Figure 1 This application provides a closed-loop steam condensate recovery system, including a recovery tank 10 and a soft water tank 20. The top of the recovery tank 10 is connected to a condensate return pipe 11, a first vent pipe 12, and a pressure relief pipe 13. The steam condensate generated by the front-end equipment is recovered into the recovery tank 10 through the condensate return pipe 11. The front-end equipment can be a high-tower compound fertilizer melting and granulation system or other production systems that use a large amount of steam. Correspondingly, the back-end equipment can be a boiler or other equipment that can generate steam.

[0023] The first vent pipe 12 is equipped with a safety valve 121, which will release pressure by jumping when the pressure inside the recovery tank 10 exceeds the preset value or the safety value of the equipment to ensure the safe use of the recovery tank 10.

[0024] The pressure relief pipe 13 is equipped with a first electric valve 131 at one end near the recovery tank 10, and the other end of the pressure relief pipe 13 is connected to the soft water tank 20. This allows for timely pressure relief when the pressure inside the recovery tank 10 exceeds a set value, ensuring the safe use of the recovery tank 10. Clearly, the recovery tank 10 is equipped with a pressure gauge, or the recovery tank 10 has a built-in pressure gauge, so that it will only activate the safety valve 121 and the first electric valve 131 when the pressure is too high.

[0025] The bottom of the recovery tank 10 is connected to a condensate reuse pipe 14 and a drain pipe 15. The condensate reuse pipe 14 is equipped with a boiler feed water pump 141 to supply water for boiler reuse. The drain pipe 15 is equipped with a drain valve 151. The residual material in the recovery tank 10 is discharged through the cooperation of the drain pipe 15 and the drain valve 151, which facilitates the maintenance of the recovery tank 10. The recovery tank 10 is also equipped with a first level gauge 16.

[0026] The lower part of the soft water tank 20 is connected to a water supply pipe 21, and the other end of the water supply pipe 21 is connected to the top of the recycling tank 10. A water supply pump 211 is provided on the water supply pipe 21.

[0027] The first level gauge 16 can identify the liquid level in the recovery tank 10 in real time. When the liquid level in the recovery tank 10 is low, the water supply pump 211 is activated to replenish the water in the soft water tank 20 to the recovery tank 10 through the water supply pipe 21. When the liquid level in the recovery tank 10 is replenished to a high level, the water supply pump 211 stops working. This ensures that the recovery tank 10 is always within the constant liquid level range between the set high and low levels, that is, the recovery tank 10 always maintains water balance. This can avoid cavitation in the boiler feed water pump 141, thereby ensuring the normal service life of the boiler feed water pump 141 and saving costs.

[0028] In one embodiment, a one-way valve 111 is provided on the condensate return pipe 11. The pressure difference of the one-way valve 111 is ≤500kpa. This can prevent the vaporized steam in the recovery tank 10 from causing a reverse impact on the return water, and will not cause excessive resistance to the condensate return flow.

[0029] In one embodiment, the pressure relief pipe 13 is also equipped with a steam-water mixer 132 at one end near the soft water tank 20. Simultaneously, the lower part of the soft water tank 20 is provided with a circulation pipe 22 for connecting the steam-water mixer 132, and a circulation pump 221 is installed on the circulation pipe 22. The circulation pump 221 is always running during system operation, serving to agitate the water in the soft water tank 20. It can also mix with the pressure relief steam from the recovery tank 10 in the steam-water mixer 132, causing condensate to form and enter the soft water tank 20.

[0030] In one embodiment, the soda mixer 132 is a jet-type soda mixer, a static mixing soda mixer, a venturi-type soda mixer, or a swirl-type soda mixer.

[0031] In one possible implementation, the top of the soft water tank 20 is also connected to a second vent pipe 23, and the other end of the second vent pipe 23 is connected to the degreasing tank 30. This allows the hot air evaporated from the soft water tank 20 to be discharged into the degreasing tank 30 through the second vent pipe 23 when the temperature inside the soft water tank 20 is too high due to continuous depressurization of the recovery tank, so as to make full use of the waste heat. The temperature can be higher than 85℃-100℃.

[0032] In one embodiment, the soft water tank 20 is equipped with a second level gauge 24, and a soft water supply pipe 25 is connected to the upper part of the soft water tank 20. A second electric valve 251 is installed on the soft water supply pipe 25. When the level of purified water in the soft water tank 20 is low, soft water is replenished to the soft water tank 20 in a timely manner through the action of the soft water supply pipe 25 and the second electric valve 251. When the level of purified water in the soft water tank is high, water replenishment stops. This ensures that the soft water tank always has sufficient soft water, thereby continuously meeting the water demand of the recycling tank 10 and ensuring the water balance within the recycling tank 10.

[0033] The first level gauge 16 and the second level gauge 24 can be any one of the following: magnetic level gauge, float level gauge, capacitive level gauge, radar level gauge, hydrostatic level gauge, or ultrasonic level gauge.

[0034] It should be noted that the terms "first" and "second" used in this application are for descriptive purposes only and do not indicate any order. They should not be construed as indicating or implying relative importance and can be interpreted as names.

[0035] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The advantages of the present invention have been fully and effectively realized. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A closed steam condensate recovery system characterized by, Including recycling tanks and soft water tanks; The top of the recovery tank is connected to a condensate return pipe, a first vent pipe, and a pressure relief pipe. The first vent pipe is equipped with a safety valve. The pressure relief pipe is equipped with a first electric valve at one end near the recovery tank and connected to the soft water tank at the other end away from the recovery tank. The bottom of the recovery tank is connected to a condensate reuse pipe and a drain pipe. The condensate reuse pipe is equipped with a boiler feed water pump to supply water for boiler reuse. The drain pipe is equipped with a drain valve. The recovery tank is also equipped with a first level gauge. The lower part of the soft water tank is connected to a water supply pipe, the other end of which is connected to the top of the recycling tank, and a water supply pump is installed on the water supply pipe.

2. The closed steam condensate recovery system of claim 1, wherein, The condensate return pipe is equipped with a one-way valve, and the pressure difference of the one-way valve is ≤500kpa.

3. The closed steam condensate recovery system of claim 1, wherein, The pressure relief pipe is also equipped with a steam-water mixer at one end near the soft water tank. The lower part of the soft water tank is equipped with a circulation pipe for connecting the steam-water mixer, and a circulation pump is installed on the circulation pipe.

4. The closed steam condensate recovery system of claim 3, wherein, The water-air mixer is a jet-type water-air mixer, a static mixing water-air mixer, a Venturi-type water-air mixer, or a vortex-type water-air mixer.

5. The closed steam condensate recovery system of claim 1, wherein, The top of the soft water tank is also connected to a second vent pipe, the other end of which is connected to the grease trap.

6. The closed steam condensate recovery system of claim 1, wherein, The soft water tank is equipped with a second level gauge, and a soft water supply pipe is connected to the upper part of the soft water tank. A second electric valve is installed on the soft water supply pipe.

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