Steam condensate recovery system and polypropylene device

Abstract

The utility model provides a steam condensate recovery system and a polypropylene device. The condensate assembly comprises a condensate tank and a condensate output pump, and the condensate output pump is arranged on a liquid outlet pipe of the condensate tank; the condensate recovery pipe comprises a first recovery pipe and a second recovery pipe, inlets of the first recovery pipe and the second recovery pipe are both communicated with an outlet of the liquid outlet pipe, an outlet of the first recovery pipe is communicated with a liquid inlet of the steam cooling and pressure reducing device, and an outlet of the second recovery pipe is communicated with a desalted water inlet of the particle water tank; and a first switch valve is arranged on the second recovery pipe. According to the scheme, steam condensate is recycled through the first recycling pipe and the second recycling pipe, and the resource utilization efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical manufacturing equipment, specifically, relates to a steam condensate recovery system and polypropylene device. BACKGROUND

[0002] Polypropylene device needs to use steam in the production process, this is mainly because the production process of polypropylene involves multiple links, and some links need to be heated or power is provided, and steam as a common heat carrier is widely used in various industrial processes. In the production of polypropylene, steam is mainly used in the following aspects:

[0003] 1, heating and drying: in the production process of polypropylene, raw materials need to be heated and dried to ensure the smooth progress of polymerization. Steam provides the necessary heat energy to help raw materials reach the appropriate temperature and dryness.

[0004] 2, polymerization reaction: the production of polypropylene involves complex chemical reactions, which need to be carried out under certain temperature and pressure conditions. Steam plays a role in providing suitable reaction conditions in this process.

[0005] 3, power supply: in some production links, steam can also be used as a power source to drive related equipment and machinery.

[0006] However, the steam condensate formed by steam condensation is not fully recycled, and the resource utilization efficiency is not high. INVENTION CONTENTS

[0007] In order to solve the above problems, the utility model provides a steam condensate recovery system and polypropylene device.

[0008] In the first aspect, the utility model provides a steam condensate recovery system, which comprises: condensate assembly and condensate recovery pipe;

[0009] The condensate assembly comprises a condensate tank and a condensate output pump, and the condensate output pump is arranged on the liquid outlet pipe of the condensate tank.

[0010] The condensate recovery pipe comprises a first recovery pipe and a second recovery pipe, the inlet of the first recovery pipe and the second recovery pipe is communicated with the outlet of the liquid outlet pipe, the outlet of the first recovery pipe is communicated with the liquid inlet of the steam temperature and pressure reducer, the outlet of the second recovery pipe is communicated with the desalted water inlet of the granular water tank, and the first switch valve is arranged on the second recovery pipe.

[0011] Beneficial effects:

[0012] Firstly, the utility model discloses a condensate tank is set up to collect steam condensate, and the condensate tank is equipped with the condensate output pump to control the condensate tank to discharge liquid, and the system has at least two kinds of condensate recycling schemes, first, through the first recovery pipe, steam condensate is discharged into the liquid inlet of steam temperature reducer, because the temperature of steam condensate is lower than steam, can be used as the medium of temperature reduction and pressure reduction, second, through the second recovery pipe, steam condensate is discharged into the desalted water inlet of granular water tank, can be used as the medium of granular water tank for overflow, and when steam condensate is insufficient for two kinds of recycling schemes, can be closed the second recovery pipe through the first switch valve. Therefore, the scheme is recycled and utilized to steam condensate through the first recovery pipe and the second recovery pipe, can improve resource utilization efficiency.

[0013] Further, the second recovery pipe is also provided with a condensate cooler and a second switch valve, the first switch valve is located on the pipeline at the inlet of the condensate cooler, and the second switch valve is located on the pipeline at the outlet of the condensate cooler.

[0014] Further, the condensate recovery pipe also includes a third recovery pipe, the inlet of the third recovery pipe is communicated with the outlet of the liquid outlet pipe, and the outlet of the third recovery pipe is communicated with the raw water inlet of the desalted water manufacturing equipment.

[0015] Secondly, the utility model provides a steam condensate recovery system, including: condensate subassembly and condensate recovery pipe,

[0016] The condensate subassembly includes a condensate tank and a condensate output pump, and the condensate output pump is arranged on a liquid outlet pipe of the condensate tank.

[0017] The condensate recovery pipe includes a second recovery pipe and a third recovery pipe, the inlets of the second recovery pipe and the third recovery pipe are communicated with the outlet of the liquid outlet pipe, the outlet of the second recovery pipe is communicated with the desalted water inlet of the granular water tank, the outlet of the third recovery pipe is communicated with the raw water inlet of the desalted water manufacturing equipment, and the second recovery pipe is provided with a first switch valve.

[0018] Beneficial effects:

[0019] Firstly, the utility model discloses a condensate tank is set up to collect steam condensate, and the condensate tank is equipped with condensate output pump to control the condensate tank to discharge liquid, and the system has at least two condensate recycling schemes, first, steam condensate is discharged into the desalted water inlet of granular water tank through the second recovery pipe, and can be used as the medium of granular water tank for overflow, second, steam condensate is discharged into the raw water inlet of desalted water manufacturing equipment through the third recovery pipe, and can be used as the raw material of desalted water manufacturing equipment, and when steam condensate is insufficient for two recycling schemes, the second recovery pipe can be closed through the first switch valve. Therefore, the second recovery pipe and the third recovery pipe are used to recycle steam condensate, and resource utilization efficiency can be improved.

[0020] Further, the second recovery pipe is also provided with a condensate cooler and a second switch valve, the first switch valve is located on the pipeline at the inlet of the condensate cooler, and the second switch valve is located on the pipeline at the outlet of the condensate cooler.

[0021] Thirdly, the utility model provides a kind of polypropylene device, it is characterized by: including desalted water manufacturing equipment, steam component, extrusion granulation component and a kind of steam condensate recovery system as any one of the above embodiments, the outlet of the second recovery pipe is communicated with the desalted water inlet of the granular water tank of the extrusion granulation component.

[0022] Further, the desalted water manufacturing equipment includes a raw water inlet, a first water outlet and a second water outlet.

[0023] The condensate recovery pipe includes a third recovery pipe, the inlet of the third recovery pipe is communicated with the outlet of the liquid outlet pipe, and the outlet of the third recovery pipe is communicated with the raw water inlet of the desalted water manufacturing equipment.

[0024] The first water outlet is communicated with the desalted water inlet of the granular water tank.

[0025] Further, the extrusion granulation component includes a granular water tank, a granular water pump, a granular water collection tank and a pelletizing water chamber.

[0026] The granular water tank includes a granular water inlet, a desalted water inlet, a drain port and a powder discharge port, and is used to generate overflow by desalted water to discharge fine powder in granular water.

[0027] The water inlet of the pelletizing water chamber is communicated with the drain port, the water outlet of the pelletizing water chamber is communicated with the water inlet of the granular water collection tank, the water outlet of the granular water collection tank is communicated with the granular water inlet, and the granular water pump is arranged on the pipeline communicated between the granular water collection tank and the granular water inlet.

[0028] The outlet of the pipeline connected with the second water outlet is located above the granular water pump to cool the granular water pump.

[0029] Further, the steam assembly comprises a steam generator and a steam temperature and pressure reducer.

[0030] The desalted water manufacturing device further comprises a third water outlet, the third water outlet is communicated with the water inlet of the steam generator, the steam outlet of the steam generator is communicated with the steam inlet of the steam temperature and pressure reducer, and the steam outlet of the steam temperature and pressure reducer is communicated with the inlet of the condensate tank. BRIEF DESCRIPTION OF DRAWINGS

[0031] The utility model will be explained in further detail below in combination with the drawings and specific embodiments.

[0032] Fig. 1 A structure schematic view of a polypropylene device provided by the utility model is shown in the figure.

[0033] Fig. 2 A structure schematic view of another polypropylene device provided by the utility model is shown in the figure.

[0034] In the figure: 1, desalted water manufacturing device; 11, raw water inlet; 12, third water outlet; 13, first water outlet; 14, third water outlet; 2, steam assembly; 21, steam generator; 22, steam temperature and pressure reducer; 221, steam inlet; 222, liquid inlet; 223, steam outlet; 3, condensate assembly; 31, condensate tank; 32, condensate output pump; 4, extrusion granulation assembly; 41, granular water tank; 411, granular water inlet; 412, desalted water inlet; 413, water outlet; 414, powder discharge port; 42, granular water pump; 43, granular water collecting tank; 44, granulating water chamber; 45, granular water cooler. DETAILED DESCRIPTION

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, in order to facilitate the description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0036] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0037] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0038] In this specification, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0040] Example 1:

[0041] like Figs. 1-2 As shown, this embodiment provides a steam condensate recovery system, including: a condensate component 3 and a condensate recovery pipe;

[0042] The condensate assembly 3 includes a condensate tank 31 and a condensate output pump 32, and the condensate output pump 32 is provided at the liquid outlet pipe of the condensate tank 31;

[0043] The condensate recovery pipe includes a first recovery pipe 5 and a second recovery pipe 6, the inlets of the first recovery pipe 5 and the second recovery pipe 6 are communicated with the outlet of the liquid outlet pipe, the outlet of the first recovery pipe 5 is communicated with the liquid inlet 222 of the steam temperature reducer 22, the outlet of the second recovery pipe 6 is communicated with the desalted water inlet 412 of the pellet water tank 41, and the second recovery pipe 6 is provided with a first switch valve 61.

[0044] Firstly, the steam condensate is collected by the condensate tank 31, and the condensate output pump 32 is arranged on the liquid outlet pipe of the condensate tank 31 to control the liquid discharge of the condensate tank 31, and the system has at least two condensate recovery and utilization schemes:

[0045] Firstly, the steam condensate is discharged into the liquid inlet 222 of the steam temperature reducer 22 through the first recovery pipe 5, and the steam condensate has a lower temperature than the steam, so it can be used as a medium for temperature reduction and pressure reduction;

[0046] Secondly, the steam condensate is discharged into the desalted water inlet 412 of the pellet water tank 41 through the second recovery pipe 6, and can be used as a medium for overflow of the pellet water tank, and when the steam condensate is insufficient for the two recovery and utilization schemes, the second recovery pipe 6 can be closed through the first switch valve 61.

[0047] Therefore, the steam condensate is recovered and utilized through the first recovery pipe 5 and the second recovery pipe 6, so that the resource utilization efficiency can be improved.

[0048] Preferably, the second recovery pipe 6 is further provided with a condensate cooler 62 and a second switch valve 63, the first switch valve 61 is arranged on the pipeline at the inlet of the condensate cooler 62, and the second switch valve 63 is arranged on the pipeline at the outlet of the condensate cooler 62.

[0049] Since the temperature of the steam condensate is usually about 80°, and the temperature of the pellet water in the pellet water tank 41 is usually 50-65℃, the temperature of the pellet water will affect the pelletizing effect, and since the steam condensate and the pellet water are close to each other in the pellet water tank 41, the temperature and flow fluctuation of the steam condensate will affect the temperature of the pellet water. Therefore, a condensate cooler 62 is arranged on the second recovery pipe 6 to reduce the temperature of the steam condensate to 50-65℃, so that the temperature fluctuation can be avoided. The arrangement of the first switch valve 61 and the second switch valve 63 can avoid liquid backflow during shutdown, and the recovery route can be opened according to needs.

[0050] Embodiment two:

[0051] As shown in Figs. 1-2 The embodiment provides a steam condensate recovery system, which comprises a condensate assembly 3 and a condensate recovery pipe.

[0052] The condensate assembly 3 comprises a condensate tank 31 and a condensate output pump 32 arranged at the liquid outlet pipe of the condensate tank 31;

[0053] The condensate recovery pipe comprises a second recovery pipe 6 and a third recovery pipe 7, the inlets of the second recovery pipe 6 and the third recovery pipe 7 are communicated with the outlet of the liquid outlet pipe, the outlet of the second recovery pipe 6 is communicated with the desalinated water inlet 412 of the granular water tank 41, the outlet of the third recovery pipe 7 is communicated with the raw water inlet 11 of the desalinated water manufacturing device 1, and the second recovery pipe 6 is provided with a first switch valve 61.

[0054] Firstly, the steam condensate is collected by the condensate tank 31, and the condensate output pump 32 is arranged at the liquid outlet pipe of the condensate tank 31 to control the discharge of the condensate tank, and the system has at least two condensate recycling schemes:

[0055] Firstly, the steam condensate is discharged into the desalinated water inlet 412 of the granular water tank 41 through the second recovery pipe 6, which can be used as a medium for overflow of the granular water tank 41;

[0056] Secondly, the steam condensate is discharged into the raw water inlet 11 of the desalinated water manufacturing device 1 through the third recovery pipe 7, which can be used as raw material for manufacturing desalinated water by the desalinated water manufacturing device 1, and when the steam condensate is insufficient for the two recycling schemes, the second recovery pipe can be closed by the first switch valve 61.

[0057] Therefore, the steam condensate is recycled by the second recovery pipe 6 and the third recovery pipe 7, which can improve the resource utilization efficiency.

[0058] Preferably, the second recovery pipe 6 is further provided with a condensate cooler 62 and a second switch valve 63, the first switch valve 61 is arranged on the pipeline at the inlet of the condensate cooler 62, and the second switch valve 63 is arranged on the pipeline at the outlet of the condensate cooler 62.

[0059] Since the temperature of the steam condensate is usually about 80°, and the temperature of the granular water in the granular water tank 41 is usually 50-65℃, the temperature of the granular water will affect the cutting effect, and since the steam condensate and the granular water are relatively close in the granular water tank 41, the temperature and flow fluctuation of the steam condensate will affect the temperature of the granular water. Therefore, a condensate cooler 62 is added to the second recovery pipe 6 to reduce the temperature of the steam condensate to 50-65℃, which can avoid temperature fluctuation. The arrangement of the first switch valve 61 and the second switch valve 63 can avoid liquid backflow during shutdown, and the recycling route can be opened as needed.

[0060] Embodiment three:

[0061] As Figs. 1-2As shown, this embodiment provides a steam condensate recovery system, including: a condensate component 3 and a condensate recovery pipe;

[0062] The condensate assembly 3 includes a condensate tank 31 and a condensate output pump 32, and the condensate output pump 32 is provided at the liquid outlet pipe of the condensate tank 31;

[0063] The condensate recovery pipe includes a first recovery pipe 5, a second recovery pipe 6 and a third recovery pipe 7. The inlets of the first recovery pipe 5, the second recovery pipe 6 and the third recovery pipe 7 are all connected to the outlet of the liquid outlet pipe. The outlet of the first recovery pipe 5 is connected to the liquid inlet 222 of the steam cooling and depressurizing device 22, the outlet of the second recovery pipe 6 is connected to the desalted water inlet 412 of the particle water tank 41, and the outlet of the third recovery pipe 7 is connected to the raw water inlet 11 of the desalted water manufacturing equipment 1. The second recovery pipe 6 is provided with a first switch valve 61.

[0064] First, this embodiment sets up a condensate tank 31 to collect steam condensate, and provides a condensate output pump 32 on the outlet pipe of the condensate tank 31 to control the discharge of liquid from the condensate tank. This system has at least three condensate recovery and utilization schemes:

[0065] First, the steam condensate is discharged into the liquid inlet 222 of the steam cooling and decompression device 22 through the first recovery pipe 5. Since the temperature of the steam condensate is lower than that of the steam, it can be used as a medium for cooling and decompression;

[0066] Second, the steam condensate is discharged into the desalted water inlet 412 of the particle water tank 41 through the second recovery pipe 6, and can serve as a medium for overflow of the particle water tank 41;

[0067] Third, the steam condensate is discharged into the raw water inlet 11 of the desalted water manufacturing equipment 1 through the third recovery pipe 7, and can be used as a raw material for the desalted water manufacturing equipment 1 to manufacture desalted water. Moreover, when the steam condensate is insufficient for the three recycling schemes, the second recovery pipe can be closed by the first switch valve 61.

[0068] Therefore, this solution recycles the steam condensate through the first recovery pipe 5, the second recovery pipe 6 and the third recovery pipe 7, which can improve resource utilization efficiency.

[0069] Example 4:

[0070] like Figs. 1-2 The polypropylene device comprises a desalted water manufacturing device 1, a steam component 2, an extrusion granulation component 4 and a steam condensate recovery system as described in any of the above embodiments, wherein the outlet of the second recovery pipe 6 is connected to the desalted water inlet 412 of the particle water tank 41 of the extrusion granulation component 4.

[0071] The polypropylene device provided by the embodiment can have at least two steam condensate recovery schemes and improve resource utilization efficiency due to the steam condensate recovery system provided by any of the embodiments.

[0072] Preferably, the desalinated water manufacturing device 1 comprises a raw water inlet 11, a first water outlet 13 and a second water outlet 14;

[0073] The condensate recovery pipe comprises a third recovery pipe 7, an inlet of the third recovery pipe 7 being in communication with an outlet of the liquid outlet pipe, and an outlet of the third recovery pipe 7 being in communication with the raw water inlet 11 of the desalinated water manufacturing device 1.

[0074] The first water outlet 13 is in communication with a desalinated water inlet 412 of the granular water tank 41.

[0075] Preferably, the extrusion granulation assembly 4 comprises a granular water tank 41, a granular water pump 42, a granular water collection tank 43 and a pelletizing water chamber 44.

[0076] The granular water tank 41 comprises a granular water inlet 411, a desalinated water inlet 412, a drain outlet 413 and a powder discharge outlet 414, and is used to generate overflow by desalinated water and discharge fine powder in the granular water.

[0077] The water inlet of the pelletizing water chamber 44 is in communication with the drain outlet 413, the water outlet of the pelletizing water chamber 44 is in communication with the water inlet of the granular water collection tank 43, the water outlet of the granular water collection tank 43 is in communication with the granular water inlet 411, and the granular water pump 42 is arranged on a pipeline in communication between the granular water collection tank 43 and the granular water inlet 411.

[0078] The water outlet of the pipeline in communication with the second water outlet 14 is located above the granular water pump 42 to cool the granular water pump 42.

[0079] Cooling the granular water pump 42 through the second water outlet 14 can improve the service life of the granular water pump 42 and avoid long-term high-temperature use.

[0080] Preferably, the extrusion granulation assembly 4 further comprises a granular water cooler 45, a water inlet of the granular water cooler 45 being in communication with the drain outlet 413, and a water outlet of the granular water cooler 45 being in communication with the water inlet of the pelletizing water chamber 44. The granular water cooler 45 further controls the temperature of the water from the water inlet of the pelletizing water chamber 44 to avoid the influence of high-temperature water on pelletizing.

[0081] Preferably, the steam assembly 2 comprises a steam generator 21 and a steam temperature and pressure reducer 22.

[0082] The desalted water manufacturing device 1 further comprises a third water outlet 12, which is in communication with a water inlet of the steam generator 21, a steam outlet of the steam generator 21 is in communication with a steam inlet 221 of the steam cooler and pressure reducer 22, and a steam outlet 223 of the steam cooler and pressure reducer 22 is in communication with an inlet of the condensate tank 31.

[0083] It should be noted that the terms "horizontal", "vertical" and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined; the terms "parallel", "perpendicular" and the like also do not mean that the fittings must be absolutely parallel or perpendicular, but can form a certain angular deviation. For example, "horizontal" only means that its direction is relatively more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In addition, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is normally placed, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0084] It can be understood that the meaning of "multiple" herein is at least two, such as two, three, etc., unless specifically limited. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but can optionally also include steps or units not listed, or can optionally also include other steps or units inherent to the process, method, product or device. The term "and / or", only describes the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after it.

[0085] The above is only an embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A steam condensate recovery system characterized by, The system comprises: a condensate assembly (3) and a condensate recovery pipe; the condensate assembly (3) comprises a condensate tank (31) and a condensate output pump (32), the condensate output pump (32) being arranged at a liquid outlet pipe of the condensate tank (31); the condensate recovery pipe comprises a first recovery pipe (5) and a second recovery pipe (6), the inlets of the first recovery pipe (5) and the second recovery pipe (6) are communicated with the outlet of the liquid outlet pipe, the outlet of the first recovery pipe (5) is communicated with a liquid inlet (222) of a steam pressure reducer (22), the outlet of the second recovery pipe (6) is communicated with a desalinated water inlet (412) of a particle water tank (41), and a first switch valve (61) is arranged on the second recovery pipe (6).

2. A steam condensate recovery system according to claim 1, wherein, The system comprises: a condensate cooler (62) and a second switch valve (63) are further arranged on the second recovery pipe (6), the first switch valve (61) is arranged on a pipeline at an inlet of the condensate cooler (62), and the second switch valve (63) is arranged on a pipeline at an outlet of the condensate cooler (62).

3. A steam condensate recovery system according to claim 1 wherein, The system comprises: the condensate recovery pipe further comprises a third recovery pipe (7), the inlet of the third recovery pipe (7) is communicated with the outlet of the liquid outlet pipe, and the outlet of the third recovery pipe (7) is communicated with a raw water inlet (11) of a desalinated water manufacturing device (1).

4. A steam condensate recovery system characterized by, The system comprises: a condensate assembly (3) and a condensate recovery pipe; the condensate assembly (3) comprises a condensate tank (31) and a condensate output pump (32), the condensate output pump (32) being arranged at a liquid outlet pipe of the condensate tank (31); the condensate recovery pipe comprises a second recovery pipe (6) and a third recovery pipe (7), the inlets of the second recovery pipe (6) and the third recovery pipe (7) are communicated with the outlet of the liquid outlet pipe, the outlet of the second recovery pipe (6) is communicated with a desalinated water inlet (412) of a particle water tank (41), the outlet of the third recovery pipe (7) is communicated with a raw water inlet (11) of a desalinated water manufacturing device (1), and a first switch valve (61) is arranged on the second recovery pipe (6).

5. A steam condensate recovery system according to claim 4, wherein, The system comprises: a condensate cooler (62) and a second switch valve (63) are further arranged on the second recovery pipe (6), the first switch valve (61) is arranged on a pipeline at an inlet of the condensate cooler (62), and the second switch valve (63) is arranged on a pipeline at an outlet of the condensate cooler (62).

6. A polypropylene plant characterized by: The system comprises a desalinated water manufacturing device (1), a steam assembly (2), an extrusion granulation assembly (4) and a steam condensate recovery system according to any one of claims 1-5, the outlet of the second recovery pipe (6) is communicated with a desalinated water inlet (412) of a particle water tank (41) of the extrusion granulation assembly (4).

7. A polypropylene apparatus according to claim 6, characterised in that: the desalinated water manufacturing device (1) comprises a raw water inlet (11), a first water outlet (13) and a second water outlet (14); the condensate recovery pipe comprises a third recovery pipe (7), the inlet of the third recovery pipe (7) is communicated with the outlet of the liquid outlet pipe, and the outlet of the third recovery pipe (7) is communicated with a raw water inlet (11) of a desalinated water manufacturing device (1); The first water outlet (13) is communicated with a desalted water inlet (412) of the granular water tank (41).

8. A polypropylene apparatus according to claim 7, characterised in that: The extrusion granulation assembly (4) comprises a granular water tank (41), a granular water pump (42), a granular water collecting tank (43) and a cutting water chamber (44). The granular water tank (41) comprises a granular water inlet (411), a desalted water inlet (412), a water outlet (413) and a powder outlet (414), and is used to generate overflow by desalted water and discharge fine powder in the granular water. The water inlet of the cutting water chamber (44) is communicated with the water outlet (413), the water outlet of the cutting water chamber (44) is communicated with the water inlet of the granular water collecting tank (43), the water outlet of the granular water collecting tank (43) is communicated with the granular water inlet (411), and the granular water pump (42) is arranged on a pipeline communicated between the granular water collecting tank (43) and the granular water inlet (411). The water outlet of the pipeline communicated with the second water outlet (14) is located above the granular water pump (42) to cool the granular water pump (42).

9. A polypropylene apparatus according to claim 8, characterised in that: The extrusion granulation assembly (4) further comprises a granular water cooler (45), the water inlet of the granular water cooler (45) is communicated with the water outlet (413), and the water outlet of the granular water cooler (45) is communicated with the water inlet of the cutting water chamber (44).

10. A polypropylene apparatus according to claim 7, wherein: The steam assembly (2) comprises a steam generator (21) and a steam temperature and pressure reducer (22). The desalted water manufacturing device (1) further comprises a third water outlet (12), the third water outlet (12) is communicated with the water inlet of the steam generator (21), the steam outlet of the steam generator (21) is communicated with the steam inlet (221) of the steam temperature and pressure reducer (22), and the steam outlet (223) of the steam temperature and pressure reducer (22) is communicated with the inlet of the condensate tank (31).

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