Condensate water waste heat recovery system based on steam jet type heat pump technology

Abstract

The utility model discloses a condensate water waste heat recovery system based on a steam jet type heat pump technology, and belongs to the technical field of feed production. The device is arranged in a steam system of a conditioning device on a feed production line, the steam system comprises a steam inlet pipe, and a steam-water separator, a filter I, a pressure gauge, a pressure reducing valve and a flow meter which are sequentially arranged on the steam inlet pipe, and the steam inlet pipe is connected with the conditioning device; the condensate water waste heat recovery system comprises a condensate water inlet pipe, a flash tank and a steam jet type heat pump, one end of the condensate water inlet pipe is connected with the steam-water separator, and the other end of the condensate water inlet pipe is connected with the flash tank; a filter II is arranged on the condensate water inlet pipe; a flash steam outlet in the flash tank is connected with a steam jet type heat pump, and the steam jet type heat pump is arranged on the steam inlet pipe and located between the pressure reducing valve and the flow meter. Flash steam generated by condensate water is recycled, the steam grade is improved, then the flash steam is reused in the tempering device, energy is saved, and it is guaranteed that the environmental protection pressure is reduced.

Description

Technical Field

[0001] This utility model relates to a condensate waste heat recovery system, and more particularly to a condensate waste heat recovery system based on steam jet heat pump technology. The system collects condensate generated during feed production, and uses a steam jet heat pump to pressurize the low-pressure flash steam in the condensate and use it as steam for feed conditioning. By recovering and utilizing the flash steam formed by the condensate, the system achieves the purpose of saving steam energy consumption, and belongs to the field of feed production technology. Background Technology

[0002] In feed processing plants, steam is used for drying, conditioning, and other operations. Condensate is generated during the steam's journey from the boiler room to the equipment in the plant. Condensate is also generated during the drying process, as steam transfers heat from the steam to the materials via heat exchangers. Before feed is processed into pellets, steam is added to the powdered material to help it form pellets and improve palatability.

[0003] Currently, to ensure steam quality, condensate must be drained from the pipeline before addition, using a steam trap. The resulting condensate, which can reach temperatures of 100°C, is typically discharged directly. However, this discharge process generates a large amount of flash steam, wasting energy and polluting the environment.

[0004] The prior art CN216315491U discloses "a steam supply mechanism for a feed conditioner", which mainly solves the problem that the steam supply mechanism of the existing feed conditioner will introduce some condensate into the conditioner, affecting the feed conditioning effect. That is, this technology also has the problem of condensate waste.

[0005] Therefore, a system is needed to recover the waste heat from the condensate generated above. Summary of the Invention

[0006] To address the aforementioned technical challenges, a condensate waste heat recovery system based on steam jet heat pump technology is proposed. In this solution, a flash tank and steam jet heat pump are used to recover the flash steam generated from the condensate. After improving the steam quality, the steam is reused in the conditioning unit, achieving not only energy savings but also reduced environmental impact.

[0007] To achieve the above technical objectives, the following technical solution is proposed:

[0008] The purpose of this technical solution is to provide: a condensate waste heat recovery system based on steam jet heat pump technology, which is installed in the steam system of the conditioning device on the feed production line. The steam system includes a steam inlet pipe and a steam-water separator, filter I, pressure gauge, pressure reducing valve and flow meter arranged sequentially on the steam inlet pipe. The steam inlet pipe is connected to the conditioning device.

[0009] The condensate waste heat recovery system includes a condensate inlet pipe, a flash tank, and a steam jet heat pump. One end of the condensate inlet pipe is connected to a steam-water separator, and the other end is connected to the flash tank. A filter II is installed on the condensate inlet pipe.

[0010] The flash steam outlet on the flash tank is connected to a steam jet heat pump, which is located on the steam inlet pipe between the pressure reducing valve and the flow meter.

[0011] Preferably, the condensate inlet pipe is also connected to the condensate outlet of the drying device on the feed production line, so as to recover the waste heat from the condensate at the drying device.

[0012] Preferably, a one-way valve is provided between the flash tank outlet and the steam jet heat pump. This ensures that the flash steam discharged from the flash tank flows unidirectionally to the steam jet heat pump, thereby providing stability for the recovery of waste heat from condensate.

[0013] Preferably, the steam jet heat pump includes an intake chamber, a mixing chamber, and a diffuser chamber arranged in sequence, which are connected in sequence; the steam inlet pipe is connected to the high-pressure steam inlet on the intake chamber, and the steam inlet pipe is connected to the nozzle inside the intake chamber; the flash steam outlet on the flash tank is connected to the low-pressure steam inlet on the intake chamber.

[0014] Preferably, the flash tank includes a tank body and a nozzle assembly disposed within the tank body, with a condensate inlet pipe connected to the nozzle assembly; a safety valve and a float switch are provided at the upper part of the tank body, and a drain ball valve is provided at the bottom of the tank body;

[0015] The nozzle assembly is located in the lower part of the tank body, and the flash steam outlet is located at the top of the tank body;

[0016] The tank is also equipped with a magnetic level gauge and a temperature sensor I. The magnetic level gauge is used to display the current liquid level, and the temperature sensor I is used to detect the current temperature.

[0017] Preferably, the steam inlet pipe is connected to a steam branch pipe in parallel, and a shut-off valve I, a temperature sensor II, a temperature sensor III and a shut-off valve II are arranged sequentially on the steam inlet pipe, and a shut-off valve III is provided on the steam branch pipe.

[0018] Gate valve I is located on the process side after the connection between the steam branch pipe inlet and the steam inlet pipe, and gate valve II is located on the process side before the connection between the steam branch pipe outlet and the steam inlet pipe.

[0019] Temperature sensor II is located between filter I and pressure gauge, and temperature sensor III is installed on the downstream side of the steam jet heat pump process.

[0020] Preferably, a drain outlet, a shut-off valve IV, and a filter II are arranged sequentially on the condensate inlet pipe, with a shut-off valve V fitted at the drain outlet. The inclusion of the drain outlet and shut-off valve V facilitates the maintenance and replacement of the shut-off valve IV, filter II, flash tank, etc.; furthermore, it allows the recovered condensate to be reused, thereby improving the condensate reuse rate.

[0021] The terms “middle,” “upper,” “in sequence,” “one end,” “the other end,” “between,” “upper part,” “lower part,” “top,” “middle part,” “after process,” and “before process” used in this technical solution are defined based on the actual usage conditions and are conventional terms in this technical field, as well as conventional terms used by those skilled in the art in actual use.

[0022] The beneficial technical effects of adopting this technical solution are as follows:

[0023] This invention utilizes a specific arrangement of steam inlet pipe, condensate inlet pipe, flash tank, and steam jet heat pump to collect condensate generated during feed production. The low-pressure flash steam in the condensate is then pressurized by the steam jet heat pump and used as steam for feed conditioning. This improves the steam quality and allows it to be reused in the conditioning device. By recycling the flash steam formed from the condensate, steam conservation is achieved, which not only saves energy but also reduces environmental pressure. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the steam system structure involved in this utility model;

[0025] Figure 2 This is a schematic diagram of the structure of this utility model;

[0026] Figure 3 This is a schematic diagram of the steam jet heat pump in this utility model;

[0027] Figure 4 This is a schematic diagram of the flash tank in this utility model;

[0028] In the diagram, 1. Steam inlet pipe, 2. Steam-water separator, 3. Filter I, 4. Pressure gauge, 5. Pressure reducing valve, 6. Flow meter, 8. Conditioning device, 9. Condensate inlet pipe, 10. Flash tank, 101. Tank body, 102. Nozzle assembly, 103. Safety valve, 104. Float switch, 105. Drain ball valve, 106. Magnetic level gauge, 107. Temperature sensor I, 11. Steam jet heat pump, 111. Inlet chamber, 112. Mixing chamber, 113. Diffuser chamber, 114. Nozzle, 115. Flash steam outlet, 12. Filter II, 13. Check valve, 14. Steam branch pipe, 15. Shut-off valve I, 16. Temperature sensor II, 17. Temperature sensor III, 18. Shut-off valve II, 19. Shut-off valve III, 20. Drain outlet, 21. Shut-off valve IV, 22. Overflow pipe, 23. Shut-off valve V. Detailed Implementation

[0029] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.

[0030] Example 1

[0031] This embodiment provides: a condensate waste heat recovery system based on steam jet heat pump technology, installed in the steam system of the conditioning device 8 on the feed production line, such as... Figure 1 As shown, the steam system includes a steam inlet pipe 1 and a steam-water separator 2, a filter I 3, a pressure gauge 4, a pressure reducing valve 5, and a flow meter 6 arranged sequentially on the steam inlet pipe 1. The steam inlet pipe 1 is connected to the conditioning device 8, and the pressure gauge 4 and the pressure reducing valve 5 are interlocked by an electrical signal.

[0032] like Figure 2 As shown, the condensate waste heat recovery system includes a condensate inlet pipe 9, a flash tank 10, and a steam jet heat pump 11. One end of the condensate inlet pipe 9 is connected to the steam-water separator 2, and the other end is connected to the flash tank 10. A filter II 12 is installed on the condensate inlet pipe 9. The flash steam outlet 115 on the flash tank 10 is connected to the steam jet heat pump 11, which is located on the steam inlet pipe 1 and between the pressure reducing valve 5 and the flow meter 6. In addition, the condensate inlet pipe 9 is also connected to the condensate outlet of the drying device on the feed production line, thus recovering the waste heat from the condensate at the drying device.

[0033] Among them, the flash steam generated by the steam jet heat pump 11 can be recovered through the steam jet heat pump 11, and after improving the steam quality, it can be reused and added to the conditioning system, thereby realizing the recovery and reuse of waste heat from the condensate.

[0034] The steam in the feed production workshop is generally high-pressure steam at 0.6-0.8 MPa and 164-174℃. It needs to be reduced to 0.3 MPa before being added to the conditioning device 8 to condition the materials. The process is as follows: the high-pressure steam passes through the steam-water separator 2 to remove condensate, and after being filtered by filter I3 and reduced by pressure reducing valve 5, it enters the conditioning device 8 to mature and condition the materials. Temperature sensors and pressure gauges 4 can be installed before and after the pressure reducing valve 5 to regulate and detect the steam pressure and temperature. At the same time, a flow meter 6 is installed to count the amount of steam used. A steam jet heat pump 11 is installed after the pressure reducing valve 5, setting the pressure value after the pressure reducing valve 5 to a higher pressure (0.4-0.5 MPa, 151-158℃). It is used as driving steam to draw in the flash steam discharged from the flash tank 10 through the low-pressure steam inlet, mix it (0.3 MPa, 143℃), and add it to the conditioning device 8. The pressure at the outlet of the steam jet heat pump 11 needs to be 0.3 MPa, which can be adjusted by the pressure reducing valve 5.

[0035] This system recovers the flash steam from the condensate in the feed workshop, thereby reducing steam usage and achieving energy conservation.

[0036] Among them, the use of steam jet heat pump to recover condensate can achieve an energy-saving efficiency of 10%; taking the production of 1 ton of pelleted fish feed as an example, the steam addition ratio is generally 6%, that is, the required steam addition is 60kg; the steam price is calculated at 200 yuan / ton.

[0037] Based on a 10t / h pellet mill, each pellet mill can save 60kg of steam per hour (10t / h×60kg×10%), and based on 10 hours of production per day, each pellet mill can save 600kg of steam (10t / h×60kg×10%×10).

[0038] That is, a 10t / h pellet mill can save 120 yuan per day (600kg × 0.2 yuan / kg).

[0039] Example 2

[0040] Based on Embodiment 1, this embodiment further defines the arrangement between the flash tank 10 and the steam jet heat pump 11 to further illustrate the technical solution.

[0041] A one-way valve 13 is provided between the outlet of the flash tank 10 and the steam jet heat pump 11. This ensures that the flash steam discharged from the flash tank 10 flows unidirectionally to the steam jet heat pump 11, thereby providing stability for the recovery of waste heat from condensate.

[0042] Example 3

[0043] Based on Examples 1-2, this example further defines the steam jet heat pump 11 to further illustrate the technical solution.

[0044] like Figure 3 As shown, the steam jet heat pump 11 includes an inlet chamber 111, a mixing chamber 112, and a diffuser chamber 113 arranged in sequence, and the inlet chamber 111, the mixing chamber 112, and the diffuser chamber 113 are connected in sequence; the steam inlet pipe 1 is connected to the high-pressure steam inlet on the inlet chamber 111, and the steam inlet pipe 1 is connected to the nozzle 114 in the inlet chamber 111; the flash steam outlet 115 on the flash tank 10 is connected to the low-pressure steam inlet on the inlet chamber 111.

[0045] When the steam jet heat pump 11 is operating, high-pressure steam generates a high-speed airflow through nozzle 114, creating a low-pressure zone at the nozzle 114 outlet. In this zone, low-pressure steam is drawn into the steam jet heat pump 11. The high-pressure steam expands while compressing the low-pressure steam, using the excess pressure of the high-pressure steam to improve the quality of the low-pressure steam. Then, it undergoes thorough mixing in mixing chamber 112. The mixed steam then passes through diffuser chamber 113 to recover some of the pressure loss, reaching the required steam pressure before being supplied to downstream applications. By using high-pressure steam to inject low-pressure steam, it simultaneously reduces the quality of the high-pressure steam and increases the quality of the low-pressure steam, generating steam with pressures ranging between high and low pressure. It can be connected to the steam inlet pipe 1 and the flash tank 10 via flanges.

[0046] Example 4

[0047] Based on Examples 1-3, this example further defines the flash tank 10 to further illustrate the technical solution.

[0048] like Figure 4 As shown, the flash tank 10 includes a tank body 101 and a nozzle assembly 102 disposed within the tank body 101. The condensate inlet pipe 9 is connected to the nozzle assembly 102. A safety valve 103 and a float switch 104 are provided on the upper part of the tank body 101, and a drain ball valve 105 is provided on the bottom of the tank body 101. The nozzle assembly 102 is disposed in the lower part of the tank body 101, and the flash steam outlet 115 is located on the top of the tank body 101. The tank body 101 is also provided with a magnetic level gauge 106 and a temperature sensor I 107, wherein the magnetic level gauge 106 is used to display the current liquid level, and the temperature sensor I 107 is used to detect the current temperature.

[0049] The condensate produced by the feed production line enters the flash tank 10 through the condensate inlet pipe 9 and filter II 12 (pressure 0.2 MPa, temperature 120℃), and is sprayed out through the nozzles of the nozzle assembly 102. Because the condensate in the condensate inlet pipe 9 has a certain pressure, the low-pressure steam (atmospheric pressure, temperature 100℃) generated by flash evaporation is produced due to the pressure difference when it is sprayed out through the nozzles. When the condensate level in the flash tank 10 reaches the float position in the float switch 104 and lifts it up, the float switch 104 opens, allowing the condensate to be discharged through the overflow pipe 22, ensuring that the liquid level does not exceed the set height. The safety valve 103 is used to release pressure when the pressure of the flash steam in the flash tank 10 exceeds the limit value, ensuring the safety of the tank 101. The magnetic level gauge 106 displays the current liquid level, and the temperature sensor I 107 displays the current temperature of the condensate. When the temperature is low, it can be discharged through the drain ball valve.

[0050] Example 5

[0051] Based on Examples 1-4, this example further specifies the following to ensure smooth and stable entry of steam into the conditioning device 8, and to ensure the controllability of steam introduction:

[0052] Steam inlet pipe 1 is connected in parallel with steam branch pipe 14. On steam inlet pipe 1, shut-off valve I 15, temperature sensor II 16, temperature sensor III 17 and shut-off valve II 18 are arranged in sequence. On steam branch pipe 14, shut-off valve III 19 is provided. Temperature sensor II 16, pressure gauge 4 and pressure reducing valve 5 are interlocked by electrical signal.

[0053] The shut-off valve I15 is located on the process side after the connection between the inlet of the steam branch pipe 14 and the connection with the steam inlet pipe 1, and the shut-off valve II18 is located on the process side before the connection between the outlet of the steam branch pipe 14 and the connection with the steam inlet pipe 1.

[0054] Temperature sensor II16 is located between filter I3 and pressure gauge 4, and temperature sensor III17 is installed on the downstream side of steam jet heat pump 11.

[0055] Example 6

[0056] Based on Examples 1-5, this example further specifies the following to ensure the smooth and stable entry of condensate into the flash tank 10 and to continuously achieve condensate waste heat recovery:

[0057] A drain outlet 20, a shut-off valve IV 21, and a filter II 12 are sequentially arranged on the condensate inlet pipe 9. A shut-off valve V 23 is fitted onto the drain outlet 20. The installation of the drain outlet 20 and the shut-off valve V 23 facilitates the maintenance and replacement of the shut-off valve IV 21, the filter II 12, the flash tank 10, etc.; on the other hand, it also allows the recovered condensate to be used for other purposes, thereby improving the condensate reuse rate.

Claims

1. A condensate waste heat recovery system based on steam jet heat pump technology, characterized in that: The steam system of the conditioning device (8) installed on the feed production line includes a steam inlet pipe (1) and a steam-water separator (2), filter I (3), pressure gauge (4), pressure reducing valve (5) and flow meter (6) arranged sequentially on the steam inlet pipe (1). The steam inlet pipe (1) is connected to the conditioning device (8). The condensate waste heat recovery system includes a condensate inlet pipe (9), a flash tank (10), and a steam jet heat pump (11). One end of the condensate inlet pipe (9) is connected to the steam-water separator (2), and the other end is connected to the flash tank (10). A filter II (12) is provided on the condensate inlet pipe (9). The flash steam outlet (115) on the flash tank (10) is connected to the steam jet heat pump (11), which is located on the steam inlet pipe (1) and between the pressure reducing valve (5) and the flow meter (6).

2. The condensate waste heat recovery system based on steam jet heat pump technology according to claim 1, characterized in that: The condensate inlet pipe (9) is also connected to the condensate outlet of the drying device on the feed production line.

3. The condensate waste heat recovery system based on steam jet heat pump technology according to claim 1, characterized in that: A one-way valve (13) is provided between the outlet of the flash tank (10) and the steam jet heat pump (11).

4. The condensate waste heat recovery system based on steam jet heat pump technology according to any one of claims 1-3, characterized in that: The steam jet heat pump (11) includes an air inlet chamber (111), a mixing chamber (112), and a diffuser chamber (113) arranged in sequence. The air inlet chamber (111), the mixing chamber (112), and the diffuser chamber (113) are connected in sequence. The steam inlet pipe (1) is connected to the high-pressure steam inlet on the air inlet chamber (111), and the steam inlet pipe (1) is connected to the nozzle (114) in the air inlet chamber (111). The flash steam outlet (115) on the flash tank (10) is connected to the low-pressure steam inlet on the air inlet chamber (111).

5. The condensate waste heat recovery system based on steam jet heat pump technology according to any one of claims 1-3, characterized in that: The flash tank (10) includes a tank body (101) and a nozzle assembly (102) installed inside the tank body (101). The condensate inlet pipe (9) is connected to the nozzle assembly (102). A safety valve (103) and a float switch (104) are provided on the upper part of the tank body (101), and a drain ball valve (105) is provided at the bottom of the tank body (101).

6. The condensate waste heat recovery system based on steam jet heat pump technology according to claim 5, characterized in that: The nozzle assembly (102) is located in the lower part of the tank body (101), and the flash steam outlet (115) is located at the top of the tank body (101).

7. The condensate waste heat recovery system based on steam jet heat pump technology according to claim 6, characterized in that: The tank (101) is also equipped with a magnetic level gauge (106) and a temperature sensor I (107).

8. The condensate waste heat recovery system based on steam jet heat pump technology according to claim 1, characterized in that: The steam inlet pipe (1) is connected in parallel with a steam branch pipe (14). The steam inlet pipe (1) is also equipped with a shut-off valve I (15), a temperature sensor II (16), a temperature sensor III (17) and a shut-off valve II (18) in sequence. The steam branch pipe (14) is equipped with a shut-off valve III (19). The shut-off valve I (15) is located on the back side of the process where the inlet of the steam branch pipe (14) is connected to the steam inlet pipe (1), and the shut-off valve II (18) is located on the front side of the process where the outlet of the steam branch pipe (14) is connected to the steam inlet pipe (1). Temperature sensor II (16) is located between filter I (3) and pressure gauge (4), and temperature sensor III (17) is located on the back side of the steam jet heat pump (11).

9. The condensate waste heat recovery system based on steam jet heat pump technology according to claim 1, characterized in that: The condensate inlet pipe (9) is provided with a drain outlet (20), a stop valve IV (21) and a filter II (12) in sequence, and a stop valve V (23) is fitted at the drain outlet (20).

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