Steam condensate treatment system

Abstract

The utility model provides a steam condensate treatment system, and belongs to the field of chemical waste treatment. The steam condensate treatment system comprises a flash evaporation device, a steam turbine, a steam compressor, an asynchronous motor and a gearbox. The steam input end of the steam turbine is connected with the steam output end of the flash evaporation device, and the steam input end of the steam compressor is connected with the steam output end of the flash evaporation device; the flash evaporation device is used for carrying out flash evaporation on steam condensate generated by indirect heating of high-temperature steam to form saturated steam and outputting the saturated steam to the steam turbine and the steam compressor; the steam turbine is used for doing work to generate power by using the input saturated steam; the steam compressor is used for compressing input saturated steam to form high-pressure superheated steam; the asynchronous motor is connected with the steam compressor through the gearbox and provides mechanical energy for the steam compressor so as to drive the steam compressor to work.

Description

Technical Field

[0001] The present invention relates to the field of chemical waste treatment, and particularly to a steam condensate treatment system. Background Art

[0002] Chemical enterprises use high-temperature steam to indirectly heat equipment in the heating workshop. After the chemical enterprises use the high-temperature steam to indirectly heat the equipment to be heated through the high-temperature steam heating equipment, low-grade steam condensate is generated, and the chemical enterprises directly carry out cooling and desalination treatment on the low-grade steam condensate.

[0003] However, these low-grade steam condensates still have a certain temperature and pressure, and their heat is not fully and reasonably utilized. They are only heat-exchanged with demineralized water and cooled by circulating water and then recovered, which not only wastes the surplus heat of the steam condensate, but also consumes a large amount of energy for cooling the steam condensate. Summary of the Invention

[0004] To solve the above technical defects, the present invention provides a steam condensate treatment system. The steam condensate treatment system flashes the steam condensate generated by indirectly heating high-temperature steam through a flashing device to obtain saturated steam; uses the input saturated steam to do work and generate electricity through a steam turbine, and compresses the input saturated steam through a steam compressor to obtain superheated steam and supply heat to the outside. The present invention recovers the steam condensate through the flashing device to obtain saturated steam, and further utilizes the saturated steam through the steam turbine and the steam compressor to realize the full utilization of the surplus heat of the steam condensate.

[0005] The first aspect of the present invention provides a steam condensate treatment system, including: a flashing device, a steam turbine, a steam compressor, an asynchronous motor, and a gearbox;

[0006] The steam input end of the steam turbine is connected to the steam output end of the flashing device, and the steam input end of the steam compressor is connected to the steam output end of the flashing device;

[0007] The flashing device is used to flash the steam condensate generated by indirectly heating high-temperature steam to form saturated steam, and output the saturated steam to the steam turbine and the steam compressor;

[0008] The steam turbine is used to do work and generate electricity by using the input saturated steam;

[0009] The steam compressor is used to compress the input saturated steam to form high-pressure superheated steam;

[0010] The asynchronous motor is connected to the steam compressor through the gearbox to provide mechanical energy for the steam compressor to drive the steam compressor to work.

[0011] In an embodiment of the present invention, the system further includes a clutch device, and the clutch device includes: a first clutch;

[0012] The first clutch is disposed between the steam turbine and the asynchronous motor, and the first clutch is used to engage or disconnect the connection between the steam turbine and the asynchronous motor;

[0013] When the steam flow rate of the saturated steam input by the steam turbine is less than a first preset value, the first clutch disconnects the connection between the steam turbine and the asynchronous motor;

[0014] When the steam flow rate of the saturated steam input by the steam turbine is greater than a second preset value, the first clutch engages the connection between the steam turbine and the asynchronous motor, and the steam turbine provides mechanical energy to the asynchronous motor and the steam compressor, and the steam compressor is driven by the steam turbine to operate;

[0015] When the steam flow rate of the saturated steam input by the steam turbine is greater than the first preset value and less than the second preset value, the first clutch engages the connection between the steam turbine and the asynchronous motor, and the steam turbine and the asynchronous motor respectively provide mechanical energy to the steam compressor, and the steam compressor is jointly driven by the steam turbine and the asynchronous motor to operate.

[0016] In an embodiment of the present invention, the system further includes: a control terminal, and the control terminal includes a calculation module and a switching module;

[0017] The calculation module is used to calculate the steam flow rate of the saturated steam input by the steam turbine;

[0018] When the steam flow rate of the saturated steam input by the steam turbine is greater than the second preset value, the switching module switches the power supply of the asynchronous motor to make the asynchronous motor convert into a generator operating state.

[0019] In an embodiment of the present invention, the clutch device further includes: a second clutch;

[0020] The second clutch is disposed between the asynchronous motor and the transmission, and the second clutch is used to engage or disconnect the connection between the gearbox and the asynchronous motor.

[0021] In an embodiment of the present invention, the flash evaporation device includes a primary flash evaporation tank and a secondary flash evaporation tank, and the condensate output end of the primary flash evaporation tank is connected to the input end of the secondary flash evaporation tank:

[0022] The primary flash evaporation tank flashes the steam condensate from the high-temperature steam heating equipment to obtain first saturated steam and primary steam condensate, and conveys the primary steam condensate to the secondary flash evaporation tank;

[0023] The secondary flash tank flashes the received primary steam condensate to obtain second saturated steam and secondary steam condensate.

[0024] In an embodiment of the present invention, the steam output end of the primary flash tank is respectively connected to the main steam inlet end of the steam turbine and the steam inlet end of the steam compressor, and is used to provide first saturated steam for the steam turbine and the steam compressor.

[0025] The steam turbine uses the first saturated steam to perform work and generate electricity.

[0026] The steam compressor compresses the first saturated steam to form high-pressure superheated steam.

[0027] In an embodiment of the present invention, the steam output end of the secondary flash tank is connected to the intermediate-stage steam inlet end of the steam turbine, and is used to provide second saturated steam for the steam turbine.

[0028] The steam turbine uses the second saturated steam as supplementary steam to perform work and generate electricity.

[0029] In an embodiment of the present invention, the system further includes an exhaust steam recovery device, and the exhaust steam recovery device includes a condenser and a first demineralized water tank.

[0030] The condenser is used to cool the exhaust steam output by the steam turbine.

[0031] The first demineralized water tank is used to perform desalination treatment on the steam turbine after the cooling treatment.

[0032] In an embodiment of the present invention, the system further includes a condensate recovery device, and the condensate recovery device includes a heat exchanger and a second demineralized water tank.

[0033] The heat exchanger is used to cool the secondary steam condensate.

[0034] The second demineralized water tank is used to perform desalination treatment on the secondary steam condensate after the cooling treatment.

[0035] In an embodiment of the present invention, the cylinder block of the steam turbine is a cast steel part, and anti-corrosion treatment is provided inside the cylinder.

[0036] The steam condensate treatment system flashes the steam condensate indirectly heated by the flash device to obtain saturated steam; the steam turbine uses the input saturated steam to perform work and generate electricity, and the steam compressor compresses the input saturated steam to obtain superheated steam and supply heat to the outside. The present invention recovers the steam condensate through the flash device to obtain saturated steam, and further utilizes the saturated steam through the steam turbine and the steam compressor, so as to make full use of the surplus heat of the steam condensate.

[0037] Other features and advantages of the technical solution of the present invention will be described in detail in the following specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings described herein are used to provide a further understanding of the present invention and form a part of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0039] Figure 1 is a schematic structural diagram of the steam condensate treatment system provided by Embodiment 1 of the present invention;

[0040] Figure 2 is a schematic structural diagram of the steam condensate treatment system provided by Embodiment 2 of the present invention.

[0041] DESCRIPTION OF THE REFERENCE NUMERALS

[0042] 01 - Steam turbine, 02 - Steam compressor, 03 - First clutch, 04 - Asynchronous motor, 05 - Primary flash tank, 06 - Secondary flash tank, 07 - Condenser, 08 - Heat exchanger, 09 - Second clutch, 10 - Gearbox. SPECIFIC IMPLEMENTATION MODE

[0043] In order to make the technical solutions and advantages in the embodiments of the present invention clearer and more understandable, the following further describes the exemplary embodiments of the present invention in detail with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than an exhaustive list of all embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0045] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0046] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or capable of communicating with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the process of implementing the present invention, the inventor found that chemical enterprises use high-temperature steam to indirectly heat equipment in the heating workshop. After the chemical enterprises use the high-temperature steam to indirectly heat the equipment to be heated through the high-temperature steam heating equipment, low-grade steam condensate is generated, and the chemical enterprises directly perform cooling and desalination treatment on the low-grade steam condensate.

[0048] However, these low-grade steam condensates still have a certain temperature and pressure, and their heat is not fully and reasonably utilized. They are only heat-exchanged with demineralized water and cooled by circulating water before being recycled, which not only wastes the surplus heat of the steam condensate but also consumes a large amount of energy due to the cooling of the steam condensate.

[0049] In view of the above problems, the embodiment of the present invention provides a steam condensate treatment system, including: a flash evaporation device, a steam turbine, a steam compressor, an asynchronous motor, and a gearbox; the steam input end of the steam turbine is connected to the steam output end of the flash evaporation device, and the steam input end of the steam compressor is connected to the steam output end of the flash evaporation device; the flash evaporation device is used to flash the steam condensate generated by indirectly heating high-temperature steam to form saturated steam and output the saturated steam to the steam turbine and the steam compressor; the steam turbine is used to perform work and generate electricity by using the input saturated steam; the steam compressor is used to compress the input saturated steam to form high-pressure superheated steam; the asynchronous motor is connected to the steam compressor through the gearbox to provide mechanical energy for the steam compressor to drive the steam compressor to work. The steam condensate treatment system flashes the steam condensate generated by indirectly heating high-temperature steam through the flash evaporation device to obtain saturated steam; the steam turbine uses the input saturated steam to perform work and generate electricity, and the steam compressor compresses the input saturated steam to obtain superheated steam and supply heat to the outside. The present invention recovers the steam condensate through the flash evaporation device to obtain saturated steam, and further utilizes the saturated steam through the steam turbine and the steam compressor, realizing the full utilization of the surplus heat of the steam condensate.

[0050] Embodiment 1

[0051] Figure 1 is a schematic structural diagram of the steam condensate treatment system provided by Embodiment 1 of the present invention, as Figure 1As shown in the figure, this embodiment provides a steam condensate treatment system, including: a flash evaporation device, a steam turbine 01, a steam compressor 02, an asynchronous motor 04, and a gearbox 10;

[0052] The steam input end of the steam turbine 01 is connected to the steam output end of the flash evaporation device, and the steam input end of the steam compressor 02 is connected to the steam output end of the flash evaporation device;

[0053] The flash evaporation device is used to flash the steam condensate generated by indirectly heating high-temperature steam to form saturated steam, and output the saturated steam to the steam turbine 01 and the steam compressor 02;

[0054] The steam turbine 01 is used to generate electricity by doing work with the input saturated steam;

[0055] The steam compressor 02 is used to compress the input saturated steam to form high-pressure superheated steam;

[0056] The asynchronous motor 04 is connected to the steam compressor 02 through the gearbox 10 to provide mechanical energy for the steam compressor 02 to drive the steam compressor 02 to work.

[0057] The gearbox 10 is used to adjust the rotational speed of the steam compressor 02 so that the rotational speed of the steam compressor 02 is consistent with the rotational speed of the asynchronous motor 04 to prevent accidents.

[0058] In this embodiment, the flash evaporation device includes a first-stage flash evaporation tank 05 and a second-stage flash evaporation tank 06. The condensate output end of the first-stage flash evaporation tank 05 is connected to the input end of the second-stage flash evaporation tank 06:

[0059] The first-stage flash evaporation tank 05 flashes the steam condensate from the high-temperature steam heating equipment to obtain first saturated steam and first-stage steam condensate, and conveys the first-stage steam condensate to the second-stage flash evaporation tank 06;

[0060] The second-stage flash evaporation tank 06 flashes the received first-stage steam condensate to obtain second saturated steam and second-stage steam condensate.

[0061] In this embodiment, the steam output end of the first-stage flash evaporation tank 05 is respectively connected to the main steam inlet end of the steam turbine 01 and the steam inlet end of the steam compressor 02, and is used to provide first saturated steam for the steam turbine 01 and the steam compressor 02;

[0062] The steam turbine 01 generates electricity by doing work with the first saturated steam;

[0063] The steam compressor compresses the first saturated steam to form high-pressure superheated steam.

[0064] In this embodiment, the steam output end of the secondary flash tank 06 is connected to the intermediate-stage steam inlet end of the steam turbine 01, and is used to provide the second saturated steam for the steam turbine 01;

[0065] The steam turbine 01 uses the second saturated steam as supplementary steam to perform work and generate electricity.

[0066] In this embodiment, the system further includes a waste steam recovery device, and the waste steam recovery device includes a condenser 07 and a first demineralized water tank;

[0067] The condenser 07 is used to cool the waste steam output by the steam turbine 01;

[0068] The first demineralized water tank is used to perform desalination treatment on the steam turbine 01 after the cooling treatment.

[0069] In this embodiment, the system further includes a condensate recovery device, and the condensate recovery device includes a heat exchanger 08 and a second demineralized water tank;

[0070] The heat exchanger 08 is used to cool the secondary steam condensate;

[0071] The second demineralized water tank is used to perform desalination treatment on the secondary steam condensate after the cooling treatment.

[0072] In this embodiment, the cylinder block of the steam turbine 01 is a cast steel part, and anti-corrosion treatment is provided inside the cylinder. Since the temperature of the steam entering the steam turbine 01 is relatively low and close to saturated steam, anti-corrosion treatment is carried out on the inner wall of the cylinder, and the main shaft and impeller of the rotor of the steam turbine 01 are also made of corrosion-resistant materials respectively.

[0073] Due to the relatively small power generation, the unit uses an asynchronous motor 04, which has a simple structure, low cost, and is easy to install, use and maintain.

[0074] In this embodiment, through the setting of two flash tanks (the primary flash tank 05 and the secondary flash tank 06), the waste heat of the steam condensate generated after indirectly heating the high-temperature steam is recovered and utilized to the greatest extent. The steam turbine 01 uses the first saturated steam to generate electricity; and the steam compressor 02 is used to compress the first saturated steam to obtain high-pressure superheated steam for external heat supply, without causing waste of energy.

[0075] Embodiment 2

[0076] This embodiment is basically the same as Embodiment 1, and the difference is that the steam condensate treatment system of this embodiment further includes a clutch device, and the clutch device is used in combination with the asynchronous motor and can drive the steam compressor through the steam turbine, further ensuring the full utilization of energy.

[0077] Figure 2It is a schematic structural diagram of the steam condensate treatment system provided in Embodiment 2 of the present invention. As Figure 2 shown, this embodiment provides a steam condensate treatment system, including: a flash evaporation device, a steam turbine 01, a steam compressor 02, an asynchronous motor 04, and a gearbox 10;

[0078] The steam input end of the steam turbine 01 is connected to the steam output end of the flash evaporation device, and the steam input end of the steam compressor 02 is connected to the steam output end of the flash evaporation device;

[0079] The flash evaporation device is used to flash the steam condensate generated by indirectly heating high-temperature steam to form saturated steam, and output the saturated steam to the steam turbine 01 and the steam compressor 02;

[0080] The steam turbine 01 is used to generate electricity by doing work with the input saturated steam;

[0081] The steam compressor 02 is used to compress the input saturated steam to form high-pressure superheated steam;

[0082] The asynchronous motor 04 is connected to the steam compressor 02 through the gearbox 10, and provides mechanical energy for the steam compressor 02 to drive the steam compressor 02 to work.

[0083] In this embodiment, the system further includes a second clutch 09, the second clutch 09 is arranged between the asynchronous motor 04 and the transmission, and the second clutch 09 is used to engage or disconnect the connection between the gearbox 10 and the asynchronous motor 04, and disconnect the asynchronous motor 04 from the steam compressor 02 when an accident occurs due to the inconsistent speeds of the steam compressor 02 and the asynchronous motor 04.

[0084] In this embodiment, the flash evaporation device includes a first-stage flash evaporation tank 05 and a second-stage flash evaporation tank 06, and the condensate output end of the first-stage flash evaporation tank 05 is connected to the input end of the second-stage flash evaporation tank 06:

[0085] The first-stage flash evaporation tank 05 flashes the steam condensate from the high-temperature steam heating equipment to obtain first saturated steam and first-stage steam condensate, and conveys the first-stage steam condensate to the second-stage flash evaporation tank 06;

[0086] The second-stage flash evaporation tank 06 flashes the received first-stage steam condensate to obtain second saturated steam and second-stage steam condensate.

[0087] In this embodiment, the steam output end of the first-stage flash evaporation tank 05 is respectively connected to the main steam inlet end of the steam turbine 01 and the steam inlet end of the steam compressor 02, and is used to provide first saturated steam for the steam turbine 01 and the steam compressor 02;

[0088] The steam turbine 01 utilizes the first saturated steam to perform work and generate electricity;

[0089] The steam compressor compresses the first saturated steam to form high-pressure superheated steam.

[0090] In this embodiment, the steam output end of the secondary flash tank 06 is connected to the intermediate-stage steam inlet end of the steam turbine 01, for providing the second saturated steam to the steam turbine 01;

[0091] The steam turbine 01 uses the second saturated steam as supplementary steam to perform work and generate electricity.

[0092] In this embodiment, the system further includes an exhaust steam recovery device, and the exhaust steam recovery device includes a condenser 07 and a first demineralized water tank;

[0093] The condenser 07 is used for cooling the exhaust steam output by the steam turbine 01;

[0094] The first demineralized water tank is used for desalting the steam turbine 01 after cooling treatment.

[0095] In this embodiment, the system further includes a condensate recovery device, and the condensate recovery device includes a heat exchanger 08 and a second demineralized water tank;

[0096] The heat exchanger 08 is used for cooling the secondary steam condensate;

[0097] The second demineralized water tank is used for desalting the secondary steam condensate after cooling treatment.

[0098] The system further includes a clutch device, and the clutch device includes: a first clutch 03;

[0099] The first clutch 03 is arranged between the steam turbine 01 and the asynchronous motor 04, and the first clutch 03 is used for engaging or disconnecting the connection between the steam turbine 01 and the asynchronous motor 04;

[0100] When the steam flow rate of the saturated steam input by the steam turbine 01 is less than a first preset value, the first clutch 03 disconnects the connection between the steam turbine 01 and the asynchronous motor 04;

[0101] When the steam flow rate of the saturated steam input by the steam turbine 01 is greater than a second preset value, the first clutch 03 engages the connection between the steam turbine 01 and the asynchronous motor 04, and the steam turbine 01 provides mechanical energy to the asynchronous motor 04 and the steam compressor 02, and the steam turbine 01 drives the steam compressor 02 to work;

[0102] When the steam flow rate of the saturated steam input by the steam turbine 01 is greater than the first preset value and less than the second preset value, the first clutch 03 engages the connection between the steam turbine 01 and the asynchronous motor 04. The steam turbine 01 and the asynchronous motor 04 respectively provide mechanical energy to the steam compressor 02, and the steam compressor 02 is driven to work jointly by the steam turbine 01 and the asynchronous motor 04.

[0103] That is, in this embodiment, when the steam flow rate of the first saturated steam input by the steam turbine 01 is less than the first preset value, the first clutch 03 disconnects the connection between the steam turbine 01 and the asynchronous motor 04;

[0104] When the steam flow rate of the first saturated steam input by the steam turbine 01 is greater than the second preset value, the first clutch 03 engages the connection between the steam turbine 01 and the asynchronous motor 04. The steam turbine 01 provides mechanical energy to the asynchronous motor 04 and the steam compressor 02, and the steam compressor 02 is driven to work by the steam turbine 01;

[0105] When the steam flow rate of the first saturated steam input by the steam turbine 01 is greater than the first preset value and less than the second preset value, the first clutch 03 engages the connection between the steam turbine 01 and the asynchronous motor 04. The steam turbine 01 and the asynchronous motor 04 respectively provide mechanical energy to the steam compressor 02, and the steam compressor 02 is driven to work jointly by the steam turbine 01 and the asynchronous motor 04.

[0106] Specifically, when the first saturated steam is input to the steam turbine 01, the first saturated steam drives the steam turbine 01 to rotate and generate mechanical energy for power generation. The steam compressor 02 inputs the first saturated steam and forms high-pressure superheated steam for the input first saturated steam, and the high-pressure superheated steam is used for external supply.

[0107] When the system is just started, the asynchronous motor 04 provides mechanical energy to the steam compressor 02. The steam compressor 02 compresses the input first saturated steam using the mechanical energy, and the asynchronous motor 04 is in the motor state. The steam turbine 01 is disconnected from the first clutch 03, and the steam turbine 01 cannot rotate following the rotation of the asynchronous motor 04. As the steam flow rate of the first saturated steam increases, the rotational speed of the steam turbine 01 increases correspondingly according to the impulse rate of the steam turbine 01.

[0108] When the rotational speed of the steam turbine 01 rises to the driving rotational speed of the asynchronous motor 04, the steam flow rate of the first saturated steam input to the steam turbine 01 is equal to the first preset value, and the steam turbine 01 can automatically engage with the first clutch 03. At this time, the steam turbine 01, the asynchronous motor 04, and the steam compressor 02 operate on the same shaft.

[0109] When the steam flow rate of the first saturated steam input to the steam turbine 01 continues to increase (when the steam flow rate of the first saturated steam is greater than the first preset value and less than the second preset value), at this time, both the steam turbine 01 and the asynchronous motor 04 provide mechanical energy for the steam compressor, and the steam turbine 01 and the asynchronous motor 04 jointly drive the steam compressor 02 to operate.

[0110] When the steam flow rate of the first saturated steam input to the steam turbine 01 rises to the second preset value, the rotational speed of the steam turbine 01 rises to the synchronous speed of the asynchronous motor 04. At this time, the slip rate of the asynchronous motor 04 is zero; when the steam flow rate of the first saturated steam input to the steam turbine 01 further increases, the rotational speed of the steam turbine 01 exceeds the synchronous speed of the asynchronous motor 04, and the slip rate of the asynchronous motor 04 is negative. The asynchronous motor 04 operates in a state transformed from a motor state to a generator state. At this time, the steam turbine 01 provides mechanical energy for the steam compressor 02, and the steam turbine 01 drives the steam compressor 02. In the coaxial system at this time, the steam turbine 01 is responsible for driving the compressor. When the steam volume of the first saturated steam input to the steam turbine 01 further increases and the steam turbine 01 generates surplus power, the steam turbine 01 provides mechanical energy for the asynchronous motor, and the asynchronous motor 04 converts the mechanical energy provided by the steam turbine 01 into electrical energy and sends the electric quantity to the plant power system for consumption.

[0111] On the contrary, if the steam volume of the steam turbine 01 is insufficient and the output decreases, after the rotational speed of the steam turbine 01 is lower than the synchronous speed of the asynchronous motor 04, the asynchronous motor 04 operates in a motor state, and the asynchronous motor 04 and the steam turbine 01 jointly drive the steam compressor 02 to operate.

[0112] The rotational speed of the steam turbine 01 continues to decrease until it is lower than the driving speed of the asynchronous motor 04, then the steam turbine 01 disengages from the first clutch 03. At this time, the steam compressor 02 is driven by the asynchronous motor 04. By using the asynchronous motor 04 to balance the driving force source of the steam compressor 02, the present invention can make full use of the mechanical energy generated by the first saturated steam input to the steam turbine 01 and greatly improve the energy utilization rate.

[0113] In this embodiment, the first preset value is determined by the driving speed of the asynchronous motor 04, and the second preset value is determined by the synchronous speed of the asynchronous motor 04.

[0114] In this embodiment, the system further includes: a control terminal, and the control terminal includes a calculation module and a switching module;

[0115] The calculation module is used to calculate the steam flow rate of the saturated steam input to the steam turbine 01;

[0116] Specifically, the calculation module includes a first calculation unit and a second calculation unit;

[0117] The method further includes:

[0118] The first calculation unit is used to calculate the steam flow rate of the first saturated steam input to the steam turbine 01, and the second calculation unit is used to calculate the steam flow rate of the second saturated steam input to the steam turbine 01.

[0119] Furthermore, the first calculation unit is used for:

[0120] Obtain the flow rate value and enthalpy value of the steam condensate of the high-temperature steam heating device, the enthalpy value of the first saturated steam, and the enthalpy value of the primary steam condensate;

[0121] Calculate the steam flow rate of the first saturated steam based on the flow rate value and enthalpy value of the steam condensate of the high-temperature steam heating device, the enthalpy value of the first saturated steam, and the enthalpy value of the primary steam condensate.

[0122] The specific formula is:

[0123]

[0124] Wherein, m1 is the steam flow rate of the first saturated steam, m is the flow rate value of the steam condensate of the high-temperature steam heating device, h is the enthalpy value of the steam condensate of the high-temperature steam heating device, h1 is the enthalpy value of the first saturated steam, and h2 is the enthalpy value of the primary steam condensate.

[0125] The second calculation unit is used for:

[0126] Obtain the flow rate value and enthalpy value of the steam condensate of the high-temperature steam heating device, the enthalpy value of the first saturated steam, the enthalpy value of the primary steam condensate, the enthalpy value of the second saturated steam, and the enthalpy value of the secondary steam condensate;

[0127] Calculate the steam flow rate of the second saturated steam based on the flow rate value and enthalpy value of the steam condensate of the high-temperature steam heating device, the enthalpy value of the first saturated steam, the enthalpy value of the primary steam condensate, the enthalpy value of the second saturated steam, and the enthalpy value of the secondary steam condensate.

[0128] The specific formula is:

[0129]

[0130] Wherein, m1 is the steam flow rate of the first saturated steam, m is the flow rate value of the steam condensate of the high-temperature steam heating device, h is the enthalpy value of the steam condensate of the high-temperature steam heating device, h1 is the enthalpy value of the first saturated steam, h2 is the enthalpy value of the primary steam condensate, m3 is the steam flow rate of the second saturated steam, h3 is the enthalpy value of the second saturated steam, and h4 is the enthalpy value of the secondary steam condensate.

[0131] When the steam flow rate of the saturated steam input to the steam turbine 01 is greater than the second preset value through the switching module, switch the power supply of the motor of the asynchronous motor 04 so that the asynchronous motor 04 is converted into the generator operating state.

[0132] Specifically, when the steam flow rate of the first saturated steam input by the steam turbine 01 further increases and the rotational speed of the steam turbine 01 exceeds the synchronous speed of the asynchronous motor 04, and when the slip ratio of the asynchronous motor 04 is negative, the switching module is used to switch the motor power supply of the asynchronous motor 04, so that the asynchronous motor 04 operates in a state transformed from a motor state to a generator state.

[0133] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concept. Therefore, the appended claims are intended to be construed to include the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0134] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention is also intended to include these modifications and variations.

[0135] The optional embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept scope of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. Additionally, it should be noted that in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without contradiction, as long as this combination does not violate the idea of the embodiments of the present invention, and it should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A steam condensate treatment system, characterized in that: include: Flash steam unit, steam turbine, steam compressor, asynchronous motor and gearbox; The steam input end of the steam turbine is connected to the steam output end of the flash evaporation device, and the steam input end of the steam compressor is connected to the steam output end of the flash evaporation device; The flash evaporation device is used to flash the steam condensate generated by indirect heating of high-temperature steam to form saturated steam, and output the saturated steam to the steam turbine and the steam compressor; The steam turbine is used to generate power by utilizing the input saturated steam; The steam compressor is used to compress the input saturated steam to form high-pressure superheated steam; The asynchronous motor is connected to the steam compressor via the gearbox to provide mechanical energy to the steam compressor to drive the steam compressor to work.

2. The steam condensate treatment system according to claim 1, characterized in that: The system further includes a clutch device, the clutch device including: a first clutch; The first clutch is arranged between the steam turbine and the asynchronous motor, and the first clutch is used to engage or disconnect the connection between the steam turbine and the asynchronous motor; The first clutch disconnects the steam turbine and the asynchronous motor when the steam flow rate of the saturated steam inputted from the steam turbine is less than a first preset value; When the steam flow rate of saturated steam inputted from the steam turbine is greater than a second preset value, the first clutch engages the connection between the steam turbine and the asynchronous motor, and the steam turbine provides mechanical energy to the asynchronous motor and the steam compressor, and the steam turbine drives the steam compressor to work; When the steam flow rate of saturated steam input by the steam turbine is greater than a first preset value and less than a second preset value, the first clutch engages the connection between the steam turbine and the asynchronous motor, and the steam turbine and the asynchronous motor respectively provide mechanical energy to the steam compressor, and the steam turbine and the asynchronous motor jointly drive the steam compressor to work.

3. The steam condensate treatment system according to claim 2, characterized in that: The system further comprises: a control terminal, the control terminal comprising a calculation module and a switching module; The calculation module is used to calculate the steam flow rate of saturated steam input by the steam turbine; The switching module is used to switch the power supply of the motor of the asynchronous motor when the steam flow rate of the saturated steam input by the steam turbine is greater than a second preset value, so that the asynchronous motor is converted into a generator operation state.

4. The steam condensate treatment system according to claim 2, characterized in that: The clutch device further comprises: a second clutch; The second clutch is arranged between the asynchronous motor and the transmission, and the second clutch is used to engage or disconnect the connection between the transmission and the asynchronous motor.

5. The steam condensate treatment system according to claim 1, characterized in that: The flash device comprises a primary flash tank and a secondary flash tank, wherein the condensate output end of the primary flash tank is connected to the input end of the secondary flash tank: The first-stage flash tank flashes the steam condensate from the high-temperature steam heating device to obtain first saturated steam and first-stage steam condensate, and transmits the first-stage steam condensate to the second-stage flash tank; The secondary flash tank flashes the received primary steam condensate to obtain second saturated steam and secondary steam condensate.

6. The steam condensate treatment system according to claim 5, characterized in that: The steam output end of the first-stage flash tank is respectively connected to the main steam inlet end of the steam turbine and the steam inlet end of the steam compressor, so as to provide the first saturated steam for the steam turbine and the steam compressor; The steam turbine utilizes the first saturated steam to generate power; The steam compressor compresses the first saturated steam to form high-pressure superheated steam.

7. The steam condensate treatment system according to claim 5, characterized in that: The steam output end of the secondary flash tank is connected to the intermediate steam inlet end of the steam turbine to provide the second saturated steam for the steam turbine; The steam turbine uses the second saturated steam as supplementary steam to generate power.

8. The steam condensate treatment system according to claim 5, characterized in that: The system further comprises an exhaust steam recovery device, wherein the exhaust steam recovery device comprises a condenser and a first desalted water tank; The condenser is used to cool the exhaust steam output by the steam turbine; The first desalted water tank is used to desalinate the steam turbine after cooling.

9. The steam condensate treatment system according to claim 5, characterized in that: The system further comprises a condensate recovery device, wherein the condensate recovery device comprises a heat exchanger and a second desalted water tank; The heat exchanger is used to cool the secondary steam condensate; The second desalted water tank is used to desalinate the secondary steam condensate after cooling.

10. The steam condensate treatment system according to claim 1, characterized in that: The cylinder body of the steam turbine is a cast steel part, and the interior of the cylinder is provided with anti-corrosion treatment.

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