High-pressure flash steam waste heat utilization system

Abstract

The utility model discloses a high-pressure flash steam waste heat utilization system, and relates to the technical field of waste heat utilization. Comprising a steam turbine; the motor is connected with the steam turbine through a first clutch; the condenser is connected with the steam turbine; the water storage tank is connected with the condenser; the circulating water system is connected with the water storage tank and the condenser; the water replenishing tank is connected with the circulating water system through a water replenishing pump; the make-up pump is connected with the motor through a second clutch. When cooling water needs to be supplemented into the cold water pool, the second clutch is connected, the steam turbine drives the motor and the make-up pump to convey the cooling water in the make-up pool to the circulating water system, and when the cooling water does not need to be supplemented into the cold water pool, the second clutch is disengaged, the motor is converted into a power generation mode, and power is generated only through the motor. Therefore, the energy generated by emptying the high-temperature flash steam can be utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat utilization, and particularly relates to a high-pressure flash steam waste heat utilization system. Background Art

[0002] The flash evaporation system, also known as the flash evaporation process or flash evaporation operation, is widely used in multiple industries such as chemical engineering, petrochemical, pharmaceutical, and food processing. It is a process technology that utilizes the characteristic of partial component evaporation (i.e., flash evaporation) of a liquid mixture when the pressure suddenly drops to achieve material separation or energy recovery. Its basic principle is based on the phase equilibrium and thermodynamic properties of the material. By controlling the temperature and pressure conditions, the components with stronger volatility in the mixture are rapidly vaporized, while the components with weaker volatility remain in the liquid state, thereby achieving the separation purpose.

[0003] In the flash evaporation system, in order to adjust the system pressure, a large amount of high-temperature flash steam can only be discharged, resulting in a large amount of energy waste. Content of the Utility Model

[0004] In order to solve the problems of the prior art, the utility model provides a high-pressure flash steam waste heat utilization system, including:

[0005] Steam turbine;

[0006] Motor, connected to the steam turbine through a first clutch;

[0007] Condenser, connected to the steam turbine;

[0008] Water storage tank, connected to the condenser;

[0009] Circulating water system, connected to the water storage tank and the condenser;

[0010] Make-up water tank, connected to the circulating water system through a make-up water pump;

[0011] The make-up water pump is connected to the motor through a second clutch.

[0012] Further, the condensate outlet of the condenser is connected to the water inlet of the water storage tank, and the water inlet of the water storage tank is located in the middle;

[0013] A plurality of baffle plates are connected to the inner wall of the water storage tank and are arranged obliquely at an angle, and the baffle plates are located above the water inlet of the water storage tank, and the lower part of the water inlet of the water storage tank is a water storage cavity;

[0014] The water outlet of the water storage tank is connected to the circulating water system.

[0015] Further, the circulating water system includes:

[0016] Hot water tank, the inlet of which is connected to the outlet of the water storage tank through a condensate pump;

[0017] Cooling tower, the inlet of which is connected to the outlet of the hot water tank through a hot water pump;

[0018] Cold water tank, the inlet of which is connected to the outlet of the cooling tower through a cold water pump;

[0019] The outlet of the cold water tank is connected to the cooling inlet of the condenser through a cooling water pump, and the water outlet of the makeup water tank is connected to the inlet of the cold water tank through the makeup water pump.

[0020] Further, a vacuum pump is connected to the condenser.

[0021] Further, it further includes: a lubricating oil station system for supplying oil to the main bearing and thrust bearing of the steam turbine simultaneously;

[0022] The lubricating oil station system includes: an oil tank;

[0023] An electric lubricating oil pump, which is connected to the oil tank;

[0024] An oil filter, which is connected to the electric lubricating oil pump through a pipeline;

[0025] A cooler, which is connected to the oil filter through a pipeline.

[0026] Further, pressure sensors and temperature sensors are installed on each pipeline of the lubricating oil station system.

[0027] Further, a first liquid level gauge is arranged in the water storage tank.

[0028] Further, a second liquid level gauge and a third liquid level gauge are respectively arranged in the cold water tank and the hot water tank.

[0029] The beneficial effects of the technical solution provided by the present utility model are as follows: In the present utility model, there are provided a steam turbine, a motor, a condenser, a water storage tank, a circulating water system, and a makeup water tank; the motor is connected to the steam turbine through a first clutch, a circulating water system is connected between the water storage tank and the condenser, the makeup water tank is connected to the circulating water system through a makeup water pump, and the makeup water pump is connected to the motor through a second clutch. When it is necessary to supplement cooling water into the cold water tank, saturated steam is input into the steam turbine to do work, and the steam turbine drives the motor and the makeup water pump to transport the cooling water in the makeup water tank to the circulating water system. When it is not necessary to supplement cooling water into the cold water tank, the second clutch is disengaged, and the motor is converted into a power generation mode, and only the motor is used for power generation, so that the energy of the part of the high-temperature flash steam discharged can be utilized. Description of the Drawings

[0030] Figure 1It is a schematic structural diagram of a high-pressure flash steam waste heat utilization system provided by the present utility model;

[0031] Figure 2 It is a schematic structural diagram of a water storage tank provided by the present utility model.

[0032] Reference numerals: 1 - steam turbine; 2 - cooling water pump; 3 - first clutch; 4 - electric motor; 5 - condenser; 6 - water storage tank; 7 - make-up water tank; 8 - make-up water pump; 9 - second clutch; 10 - hot water tank; 11 - condensate pump; 12 - cooling tower; 13 - hot water pump; 14 - cold water tank; 15 - cold water pump; 16 - vacuum pump; 17 - oil tank; 18 - electric lubricating oil pump; 19 - oil filter; 20 - cooler; 21 - steam baffle. Specific embodiments

[0033] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0034] To make the objectives, technical solutions, and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below in conjunction with the accompanying drawings.

[0035] It should be noted that in this embodiment, the orientation or positional relationship indicated by "bottom", "top", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application 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 construed as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be construed as indicating or implying relative importance.

[0036] It should also be noted that in this embodiment, unless otherwise clearly specified and limited, the terms "set" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. 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.

[0037] See Figure 1 - Figure 2 , a high-pressure flash steam waste heat utilization system, including: steam turbine 1, electric motor 4, condenser 5, water storage tank 6, circulating water system, make-up water tank 7, make-up water pump 8.

[0038] The output shaft of the steam turbine 1 is connected to the input end of the motor 4 through the first clutch 3, and the make-up water pump 8 is connected to the output end of the motor 4 through the second clutch 9; a circulating water system is connected between the water storage tank 6 and the condenser 5.

[0039] Among them, the circulating water system includes: a hot water tank 10, a cooling tower 12, and a cold water tank 14; the inlet of the hot water tank 10 is connected to the outlet of the water storage tank 6 through a condensate pump 11, the inlet of the cooling tower 12 is connected to the outlet of the hot water tank 10 through a hot water pump 13, and the inlet of the cold water tank 14 is connected to the outlet of the cooling tower 12 through a cold water pump 15; the outlet of the cold water tank 14 is connected to the cooling inlet of the condenser 5 through a cooling water pump 2, the water outlet of the make-up water tank 7 is connected to the inlet of the cold water tank 14 through the make-up water pump 8, and the pump shaft of the make-up water pump 8 is connected to the output shaft of the motor 4 through the second clutch 9. The first clutch 3 is an overrunning clutch, and the model can be XHL-36. The second clutch 9 can be an electromagnetic clutch, and the model can be a dry single-plate electromagnetic clutch TJ-A type. The motor 5 is an asynchronous motor.

[0040] The 0.9 MPa, 175 - 180 °C, about 20 T / h saturated steam emptied from the flash evaporation system is input to the steam turbine 1 for work, and about 2500 KW of work can be done. The steam turbine 1 is used to drive the motor 5 for asynchronous power generation. At this time, the second clutch 9 is disengaged. During the work of the steam turbine 1, the exhaust steam is condensed in the condenser 5, and the condensed water flows into the water storage tank 6. After the condensed water in the water storage tank 6 reaches a certain amount, it is transported to the hot water tank 10 through the condensate pump 11. The condensed water in the hot water tank 10 is transported to the cooling tower 12 through the hot water pump 13. The cooling tower 12 can cool down the water from the hot water tank 10. The cooled water is transported to the cold water tank 14 through the cold water pump. The power of the cooling tower 12 can be adjusted according to the required cold water temperature in the cold water tank 14. The cold water in the cold water tank 14 is transported to the condenser 5 as a cooling medium through the cooling water pump 21. The cooling medium input to the condenser 5 can also be cycled into the hot water tank 10 and used again after being cooled.

[0041] In this embodiment, the condensed water is cooled and used as a cold zone medium, or the condensed water can be discharged to the demineralized water system required by the factory, or other uses can be carried out, such as directly recycling it as boiler feed water.

[0042] When it is necessary to supplement cooling water to the cold water tank 14, the steam turbine 1 drives the motor 4 and the make-up water pump 8 to transport the cooling water in the make-up water tank 7 into the cold water tank 14. When it is not necessary to supplement cooling water to the cold water tank 14, the second clutch 9 is disengaged, and the motor 4 is switched to the power generation mode, and power generation is only carried out through the motor 4; in most cases, the motor is in the asynchronous power generation state.

[0043] The steam turbine 1 is connected to the electric motor 4 through the first clutch 3. When the steam turbine system fails and shuts down, the first clutch 3 disengages. At this time, if water replenishment is required, the second clutch engages, and the electric motor 4 is directly used as the driving mechanism to drive the water replenishing pump.

[0044] Furthermore, in this embodiment, the model of the steam turbine 1 is B1.8 - 1.0 / 0.55. The steam turbine body mainly consists of a rotor part and a stator part. The rotor part includes a rotor, impellers, blades, couplings, etc.; the stator part includes a cylinder, nozzle group, diaphragm, steam seal, bearings, bearing pedestals, governing valves, etc. The steam turbine cylinder body is a cast steel part, divided into upper and lower cylinders, and the upper and lower cylinders are further divided into front and rear halves. There are flange surfaces at both ends, which are connected and fixed together by cylinder bolts. Cylinder aging is carried out through heat treatment. The steam turbine inlet is at the right end of the front cylinder, and the exhaust port is at the right end of the rear cylinder. The inter-stage nozzles and diaphragm stator blades of the steam turbine adopt a shroud structure for grouping and welding, and finally welded in the nozzle ring groove. After welding, finish machining is carried out after heat treatment. The main shaft and impellers of the steam turbine rotor are integral forged alloy steel parts after heat treatment. The impellers are sleeved on the main shaft through hot-fitting technology. Each stage of blades is manually inserted into the blade root grooves of the same impeller, and the last blade in each row is fixed to the impeller by welding.

[0045] Furthermore, the high-pressure flash steam waste heat utilization system further includes: a lubricating oil station system for supplying oil to the main bearings and thrust bearings of the steam turbine 1 simultaneously.

[0046] The lubricating oil station system includes: an oil tank 17, an electric lubricating oil pump 18, an oil filter 19, and a cooler 20. The oil tank 17 can be 1.5 cubic meters. The electric lubricating oil pump 18 is connected to the oil tank 17 through a pipeline. The electric lubricating oil pump 18 is connected to the oil filter 19 and the cooler 20 through pipelines. The cooler 20 supplies oil to the main bearings and thrust bearings of the steam turbine 1 simultaneously through a pipeline. The lubricating oil in the pressure oil circuit of the cooler 20 is cooled before entering the key lubrication points to ensure that the oil temperature is appropriate. The oil filter 19 is used to filter impurities in the lubricating oil in the oil circulation path to improve the oil quality.

[0047] In addition, a heating device can be set in the oil tank 17 to maintain the temperature of the lubricating oil within a suitable range, ensure that the lubricating oil can quickly reach the working temperature during startup, and remain stable throughout the operation process to ensure the fluidity of the lubricating oil, lubrication effect, and safe operation of the equipment.

[0048] A pressure sensor is installed on the pipeline of the lubricating oil station system. The pressure sensor, the first audible and visual alarm, the electric lubricating oil pump 18 are electrically connected to the controller. The model of the pressure sensor can be MPM388, and the model of the controller can be WOODWARD 505 / 505E. Under any operating conditions, the normal working oil pressure is 0.1 - 0.15 MPa. The pressure sensor detects the pressure on the pipeline and sends the pressure data to the controller. When the controller determines that the lubricating oil pressure is lower than 0.08 MPa, it controls the electric lubricating oil pump 18 to start. When the controller determines that the lubricating oil pressure is lower than 0.05 MPa, it sends a first alarm signal to the first audible and visual alarm to remind the staff.

[0049] The oil tank 17 also receives the lubricating oil returned from each lubrication point through the return oil pipeline. Under any operating conditions, the return oil temperature of each bearing does not exceed 65 °C. Therefore, a temperature sensor is connected to the return oil pipeline. The model of the temperature sensor can be Kobold TWP. The temperature sensor, the second audible and visual alarm are electrically connected to the controller. The temperature sensor continuously monitors the temperature on the return oil pipeline and sends the temperature data to the controller. When the controller determines that the temperature data exceeds 65 °C, it sends a second alarm signal to the second audible and visual alarm to remind the staff.

[0050] Furthermore, the condenser 5 is a surface condenser, and the tube bundle is made of stainless steel. The exhaust steam of the steam turbine 1 condenses in the condenser 5. The condensate outlet of the condenser 5 is connected to the water inlet of the water storage tank 6, and the water inlet of the water storage tank 6 is located in the middle. A number of baffle plates 21 are connected to the inner wall of the water storage tank 6 and are arranged obliquely upward at an angle, and the baffle plates 21 are located above the water inlet of the water storage tank 6. The lower part of the water inlet of the water storage tank 6 is a water storage cavity. Among them, the inclination angle of the baffle plate 6 is 20 - 45°.

[0051] The condensate of the condenser 5 enters the water storage tank 6, and the condensate flows into the lower water storage cavity. A small amount of steam still existing in the condensate is transported upward and blocked by the baffle plate 21, condenses on the baffle plate 21 and then slides down along the baffle plate 21 into the water storage cavity, and the non-condensable gas is discharged from the exhaust port above. A spray head is connected to the top of the water storage tank 6, and cooling water can be sprayed through the spray head.

[0052] A first liquid level gauge is arranged in the water storage tank 6. The first liquid level gauge can be a float type liquid level gauge. The first liquid level gauge, the condensate pump 11 are electrically connected to the controller. The lower limit water level value and the upper limit water level value corresponding to the water storage tank 6 can be pre-stored in the controller. When the controller receives the liquid level value detected by the first liquid level gauge, it makes a judgment. When the water level of the water storage tank 6 is lower than the lower limit water level value, the controller controls the condensate pump 11 to stop working. When the water level of the water storage tank 6 is higher than the upper limit water level value, the controller controls the condensate pump 11 to start and discharge the condensate into the hot water pool 10 of the circulating water system.

[0053] Furthermore, a second liquid level gauge and a third liquid level gauge are respectively arranged in the cold water tank 14 and the hot water tank 10. The second liquid level gauge and the third liquid level gauge can be float type liquid level gauges. The second liquid level gauge, the third liquid level gauge, the hot water pump 13, the second clutch 9, and the motor 4 are all electrically connected to the controller. Lower limit water level values and upper limit water level values corresponding to the cold water tank 14, and lower limit water level values and upper limit water level values corresponding to the hot water tank 10 can be pre-stored in the controller. When the controller receives the liquid level value sent by the third liquid level gauge, it makes a judgment. When the water level in the hot water tank 10 is lower than the lower limit water level value, the controller controls the hot water pump 13 to stop working. When the water level in the hot water tank 10 is higher than the upper limit water level value, the controller controls the hot water pump 13 to start. When the controller receives the liquid level value sent by the second liquid level gauge, it makes a judgment. When the water level in the cold water tank 14 is lower than the lower limit water level value, the controller controls the second clutch 9 to engage, and drives the motor and the makeup water pump 8 to work through the steam turbine, and conveys the water in the makeup water tank 7 into the cold water tank 14. When the water level in the cold water tank 14 is higher than the upper limit water level value, the controller controls the second clutch 9 to disengage, stops the work of the makeup water pump 8, and converts the motor 4 into a power generation mode.

[0054] In addition, a vacuum pump 16 is connected to the shell of the condenser 5 through a pipeline to extract the non-condensable gas from the inside of the condenser, maintain the vacuum state inside the condenser, improve the steam condensation efficiency, and ensure the normal operation of the steam turbine.

[0055] It should be noted that the above-mentioned electrical connection is a connection method for achieving electrical continuity between circuits. It can be to connect different parts of the circuit through components such as wires, cables, and connectors so that current can flow between them; it can also be wireless, such as electromagnetic waves, radio frequencies, etc., to achieve the transmission of energy or signals without physical wire connection.

[0056] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-pressure flash steam waste heat utilization system, characterized in that: include: Steam turbine (1); An electric motor (4) connected to the steam turbine (1) via a first clutch (3); a condenser (5), connected to the steam turbine (1); A water storage tank (6) connected to the condenser (5); A circulating water system connected to the water storage tank (6) and the condenser (5); A water replenishment tank (7) connected to the circulating water system via a water replenishment pump (8); The water replenishment pump (8) is connected to the electric motor (4) via a second clutch (9).

2. The high-pressure flash steam waste heat utilization system according to claim 1, characterized in that: The condensate outlet of the condenser (5) is connected to the water inlet of the water storage tank (6), and the water inlet of the water storage tank (6) is located in the middle; A plurality of steam baffles (21) arranged at an angle are connected to the inner wall of the water storage tank (6), and the steam baffles (21) are located above the water inlet of the water storage tank (6), and a water storage cavity is located below the water inlet of the water storage tank (6); The water outlet of the water storage tank (6) is connected to the circulating water system.

3. The high-pressure flash steam waste heat utilization system according to claim 2, characterized in that: The circulating water system comprises: A hot water tank (10), the inlet of which is connected to the outlet of the water storage tank (6) via a condensate pump (11); A cooling tower (12), the inlet of which is connected to the outlet of the hot water pool (10) via a hot water pump (13); A cold water tank (14), the inlet of which is connected to the outlet of the cooling tower (12) via a cold water pump (15); The outlet of the cold water tank (14) is connected to the cooling inlet of the condenser (5) through a cooling water pump (2), and the outlet of the make-up water tank (7) is connected to the inlet of the cold water tank (14) through the make-up water pump (8).

4. The high-pressure flash steam waste heat utilization system according to claim 2, characterized in that: The condenser (5) is connected to a vacuum pump (16).

5. The high-pressure flash steam waste heat utilization system according to claim 1, characterized in that: It also includes: a lubricating oil station system, used for simultaneously supplying oil to the main bearing and thrust bearing of the steam turbine (1); The lubricating oil station system comprises: an oil tank (17); An electric lubricating oil pump (18) connected to the oil tank (17); An oil filter (19) connected to the electric lubricating oil pump (18) via a pipeline; A cooler (20) is connected to the oil filter (19) through a pipeline.

6. The high-pressure flash steam waste heat utilization system according to claim 5, characterized in that: Pressure sensors and temperature sensors are installed on each pipeline of the lubricating oil station system.

7. The high-pressure flash steam waste heat utilization system according to claim 2, characterized in that: A first liquid level gauge is arranged in the water storage tank (6).

8. The high-pressure flash steam waste heat utilization system according to claim 3, characterized in that: A second liquid level gauge and a third liquid level gauge are respectively arranged in the cold water pool (14) and the hot water pool (10).

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