Temperature adjusting device for water jet type air extractor of steam turbine

Abstract

The utility model discloses a temperature adjusting device for a water jet type air ejector of a steam turbine, relates to the technical field of boilers, and mainly aims to stably control the water jet temperature of the water jet type air ejector of the steam turbine. According to the main technical scheme, the steam turbine water jet type air extractor temperature adjusting device comprises a water jet part which comprises a water jet tank, a water jet pump and an air extractor, an inlet of the water jet pump is connected to the lower end side of the water jet tank, an outlet of the water jet pump is connected to a nozzle of the air extractor through a water conveying pipe, and an outlet of the air extractor is connected to the upper end of the water jet tank; the water supplementing pipe is connected to the top wall of the water jetting tank, the multiple first baffle plates and the multiple second baffle plates are arranged in the upper space of the water jetting tank in a staggered mode, the upper ends of the first baffle plates are fixedly connected to the top wall of the water jetting tank, the lower ends of the second baffle plates are lower than the lower ends of the first baffle plates, and the overflow pipe is connected to the first position of the side wall of the water jetting tank. The first position is higher than the lower end of the second baffle plate and lower than the lower end of the first baffle plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a boiler technical field especially relates to a steam turbine water jet type air ejector temperature adjusting device. BACKGROUND

[0002] The global concern for energy consumption and environmental protection is increasing, and the waste heat power generation technology of calcining furnace of carbon enterprises has become one of the important directions of development in the industry due to its excellent energy saving and emission reduction effect. The waste heat of high temperature or medium temperature flue gas discharged by the carbon tank type calcining furnace is produced into medium temperature and pressure or low temperature and pressure steam by installing a waste heat boiler, which drives the steam turbine to rotate, thereby driving the generator to generate electricity, and the electricity is delivered to the factory general step-down substation for factory production. A 300,000 tons / year capacity carbon plant usually configures a small steam turbine generator set of 4-8MW.

[0003] However, during the operation of the waste heat boiler, the steam condenses into water, and the gas that is not dissolved in water will continuously accumulate in the upper space of the condenser, affecting the vacuum degree and working efficiency of the condenser. The water jet air ejector is a special equipment for sucking the vacuum of the condenser of the steam turbine unit. The steam turbine water jet type air ejector utilizes high-speed water flow to generate vacuum, effectively extracts the steam and insoluble gas mixture in the condenser, and ensures the normal operation and efficiency of the condenser. The water jet temperature is a key factor affecting the working efficiency of the steam turbine water jet type air ejector, and the existing equipment cannot well control the water jet temperature, affecting the working efficiency of the air ejector. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the utility model provides a steam turbine water jet type air ejector temperature adjusting device, which mainly aims to stabilize the water jet temperature of the steam turbine water jet type air ejector.

[0005] In order to achieve the above purpose, the utility model mainly provides the following technical scheme:

[0006] The utility model provides a steam turbine water jet type air ejector temperature adjusting device, which comprises: a water jet part and a water supplementing part.

[0007] The water jet part comprises a water jet tank, a water jet pump and an air ejector, the inlet of the water jet pump is connected to the lower end side of the water jet tank, the outlet of the water jet pump is connected to the nozzle of the air ejector through a water delivery pipe, and the outlet of the air ejector is connected to the upper end of the water jet tank.

[0008] The water replenishing part comprises a water replenishing pipe, an overflow pipe, a plurality of first baffles and a plurality of second baffles, the water replenishing pipe is connected to the top wall of the water jet tank, the plurality of first baffles and the plurality of second baffles are staggered arranged in the upper space of the water jet tank, the upper end of the first baffle is fixedly connected to the top wall of the water jet tank, the lower end of the second baffle is lower than the lower end of the first baffle, the overflow pipe is connected to the first position of the side wall of the water jet tank, the first position is higher than the lower end of the second baffle and lower than the lower end of the first baffle, so that the liquid level of the water jet tank is stabilized between the lower end of the first baffle and the lower end of the second baffle, and a gas phase baffle space is formed in the upper part of the water jet tank.

[0009] The water replenishing pipe is provided with a control valve, and the water conveying pipe is provided with a temperature sensor; the temperature sensor and the control valve are integrated in a DCS control system.

[0010] The technical problems can be further solved by the following technical measures.

[0011] Optionally, the outlet of the air extractor and the overflow pipe are located at the distal end of the top wall of the water jet tank.

[0012] Optionally, a plurality of spray heads are arranged on the top wall of the water jet tank, and the water replenishing pipe is connected to the plurality of spray heads.

[0013] Optionally, a partition plate is arranged between the gas phase baffle space and the first position, and the lower end of the partition plate is lower than the lower end of the second baffle.

[0014] Optionally, a finned radiator comprises an S-shaped pipe and a set of radiating fins, the S-shaped pipe is embedded in the set of radiating fins, and the S-shaped pipe is connected to the water conveying pipe.

[0015] Optionally, the finned radiator further comprises an axial flow fan, the axial flow fan and the set of radiating fins are oppositely arranged, and the temperature sensor and the axial flow fan are integrated in a DCS control system.

[0016] Optionally, a pressure relief valve is arranged on the top wall of the water jet tank, and the outlet of the air extractor and the pressure relief valve are located at two ends of the gas phase baffle space.

[0017] Optionally, a communication pipe and a water storage tank are arranged, one end of the communication pipe is connected to a second position of the side wall of the water jet tank, the other end of the communication pipe is connected to the top wall of the water storage tank, the second position is lower than the first position, and the second position is higher than the lower end of the second baffle.

[0018] Optionally, a water delivery pump and a liquid level meter are further included, the inlet of the water delivery pump is connected to the lower end side of the water storage tank, the outlet of the water delivery pump is connected to a water using device, and the liquid level meter and the water delivery pump are integrated in a DCS control system.

[0019] Optionally, the lower end side of the water jet tank is connected to a sewage pipe, and the sewage pipe is provided with a sewage valve.

[0020] By the above technical solution, the utility model at least has the following advantages:

[0021] During the operation of the waste heat boiler, the water jet pump outputs a high-speed water flow to the air extractor, a vacuum is generated in the air extractor, and the high-temperature gas in the condenser is continuously extracted, and finally the high-temperature gas enters the water jet tank through the outlet of the air extractor along with the high-speed water flow.

[0022] During the above process, the water temperature in the water jet tank rises, when the temperature sensor detects that the water temperature at the inlet of the air extractor reaches the upper limit of the working water temperature setting threshold, the control valve is opened, the water supplement pipe starts to supplement cold water to the water jet tank, along with the continuous supplement of cold water, the water level in the water jet tank is stabilized at the first position, the excess water flows out along the overflow pipe, the upper part of the water jet tank forms a gas phase baffle space, the water vapor entering the water jet tank from the air extractor flows along the gas phase baffle space, prolonging the residence time of the water vapor, at the same time, the water vapor inevitably receives the leaching of the cold water supplemented by the water supplement pipe, so that the water vapor is maximally liquefied.

[0023] At the same time, when the water temperature at the inlet of the air extractor drops to the lower limit of the working water temperature setting threshold, the control valve is closed, and the water supplement pipe stops supplementing cold water to the water jet tank.

[0024] Through the above process, the water jet temperature of the air extractor is continuously stabilized within the working water temperature setting threshold range, so that the steam turbine water jet type air extractor works efficiently. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 The structure diagram of the steam turbine water jet type air extractor temperature adjusting device provided by the utility model embodiment.

[0026] The reference signs in the drawings of the specification include: water jet tank 1, water jet pump 2, air extractor 3, water delivery pipe 4, water supplement pipe 5, overflow pipe 6, first baffle plate 7, second baffle plate 8, control valve 9, temperature sensor 10, spray head 11, partition plate 12, fin radiator 13, pressure relief valve 14, communication pipe 15, water storage tank 16, water delivery pump 17, liquid level meter 18, sewage pipe 19, sewage valve 20. DETAILED DESCRIPTION

[0027] For further illustrating the technical means and effects taken by the utility model to achieve the predetermined utility model purposes, the following will combine with the drawings and the preferred embodiments to specifically explain the specific implementation manners, structures, features and effects according to the utility model application as follows.In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment.In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0028] The utility model will be further explained in detail in combination with the drawings and embodiments.

[0029] As Figure 1 shown, one embodiment of the utility model provides a steam turbine water jet type air ejector temperature adjusting device, it includes: water jet part and water supplement part;

[0030] The water jet part includes water jet tank 1, water jet pump 2 and air ejector 3, the import of water jet pump 2 is connected to the lower end side of water jet tank 1, the outlet of water jet pump 2 is connected to the nozzle of air ejector 3 through water delivery pipe 4, and the outlet of air ejector 3 is connected to the upper end of water jet tank 1.

[0031] The water supplement part includes water supplement pipe 5, overflow pipe 6, multiple first baffle plates 7 and multiple second baffle plates 8, water supplement pipe 5 is connected to the top wall of water jet tank 1, multiple first baffle plates 7 and multiple second baffle plates 8 are staggered in the upper space of water jet tank 1, the upper end of first baffle plate 7 is fixedly connected to the top wall of water jet tank 1, the lower end of second baffle plate 8 is lower than the lower end of first baffle plate 7, overflow pipe 6 is connected to the first position of the side wall of water jet tank 1, the first position is higher than the lower end of second baffle plate 8 and lower than the lower end of first baffle plate 7, for making the liquid level of water jet tank 1 stable between the lower end of first baffle plate 7 and the lower end of second baffle plate 8, to form a gas phase baffle space in the upper part of water jet tank 1.

[0032] Wherein, control valve 9 is installed in water supplement pipe 5, temperature sensor 10 is installed in water delivery pipe 4, temperature sensor 10 and control valve 9 are integrated in DCS control system.

[0033] The working process of a steam turbine water jet type air ejector temperature adjusting device is as follows:

[0034] In the operation process of the waste heat boiler, water jet pump 2 outputs high-speed water flow to air ejector 3, vacuum is generated in air ejector 3, high-temperature gas in the condenser is continuously extracted, and finally the high-temperature gas enters water jet tank 1 through the outlet of air ejector 3 along with the high-speed water flow.

[0035] In the above process, the water temperature in the water tank 1 is increased, when the temperature sensor 10 detects that the water temperature at the inlet of the ejector 3 reaches the upper limit of the working water temperature setting threshold, the control valve 9 is opened, and the water supplement pipe 5 starts to supplement cold water to the water tank 1. With the continuous supplement of cold water, the water level in the water tank 1 is stabilized at the first position, and the excess water flows out along the overflow pipe 6. The upper part of the water tank 1 forms a gas phase baffle space, and the water vapor entering the water tank 1 from the ejector 3 flows along the gas phase baffle space, prolonging the residence time of the water vapor. At the same time, the water vapor inevitably receives the leaching of the cold water supplemented by the water supplement pipe 5, thereby maximizing the liquefaction and condensation of the water vapor.

[0036] At the same time, when the water temperature at the inlet of the ejector 3 decreases to the lower limit of the working water temperature setting threshold, the control valve 9 is closed, and the water supplement pipe 5 stops supplementing cold water to the water tank 1.

[0037] Through the above process, the water temperature of the ejector 3 is continuously stabilized within the working water temperature setting threshold range, so that the steam turbine water jet ejector 3 works efficiently.

[0038] Specifically, the upper end of the ejector 3 is provided with a nozzle, and the upper space of the condenser is connected to the upper end side of the ejector 3 through a pipeline. The high-speed water flow is sprayed downward from the nozzle. In the ejector 3, due to the Venturi effect, negative pressure is generated, the gas in the upper space of the condenser reaches the ejector 3, and is sprayed to the water tank 1.

[0039] In a specific embodiment, the outlet of the ejector 3 and the overflow pipe 6 are located at the far end of the top wall of the water tank 1.

[0040] In this embodiment, specifically, the outlet of the ejector 3 is connected to one side of the top wall of the water tank 1, and the overflow pipe 6 is connected to the side wall on the other side of the top wall of the water tank 1. The overflow pipe 6 and the ejector 3 are respectively connected to the two ends of the gas phase baffle space, so that the water vapor has a longer residence time in the water tank 1.

[0041] In a specific embodiment, a plurality of spray heads 11 are arranged in sequence on the top wall of the water tank 1, and the water supplement pipe 5 is connected to the plurality of spray heads 11.

[0042] In this embodiment, specifically, a plurality of spray heads 11 are arranged in sequence on the top wall of the water tank 1, so that the plurality of spray heads 11 are arranged in the entire gas phase baffle space, so that the supplemented cold water and the water vapor have a larger heat exchange area.

[0043] In a specific embodiment, a partition plate 12 is further included, which is arranged between the gas phase baffle space and the first position, and the lower end of the partition plate 12 is lower than the lower end of the second baffle plate 8.

[0044] In the embodiment, specifically, the upper end of the partition plate 12 is fixedly connected to the top wall of the water injection tank 1, and the partition plate 12 separates the gas phase space of the water injection tank 1, and the gas phase flow space is located on one side of the partition plate 12, so as to avoid the water vapor from escaping from the overflow pipe 6, thereby enabling the water vapor to be fully washed by the supplemented cold water;

[0045] Meanwhile, the inside space of the water injection tank 1 on both sides of the partition plate 12 is communicated at the lower part, so as to form a communicating vessel, thereby ensuring that the water in the water injection tank 1 can normally flow out through the overflow pipe 6, and ensuring that the water level in the water injection tank 1 is stable.

[0046] In the embodiment, the finned radiator 13 further includes an S-shaped pipe and a set of heat dissipation fins, the S-shaped pipe is embedded in the set of heat dissipation fins, and the S-shaped pipe is communicated with the water delivery pipe 4.

[0047] In the embodiment, specifically, when the water injection pump 2 delivers high-speed water flow to the air extractor 3, the high-speed water flow flows through the S-shaped pipe, and the heat in the high-speed water flow is dissipated to the air through the set of heat dissipation fins, thereby improving the cooling efficiency of the high-speed water flow.

[0048] In the embodiment, the finned radiator 13 further includes an axial flow fan, the axial flow fan and the set of heat dissipation fins are oppositely arranged, and the temperature sensor 10 and the axial flow fan are integrated in a DCS control system.

[0049] In the embodiment, specifically, the axial flow fan and the set of heat dissipation fins are opposite to each other, the axial flow fan drives external air flow to blow through the set of heat dissipation fins, thereby improving the heat exchange efficiency of the set of heat dissipation fins, and indirectly improving the cooling efficiency of the high-speed water flow.

[0050] The temperature sensor 10 and the axial flow fan are interlocked controlled, when the temperature sensor 10 detects that the temperature of the high-speed water flow is higher than the upper limit of the working water temperature setting threshold of the air extractor 3, the axial flow fan is started.

[0051] In the embodiment, the water injection tank 1 further includes a pressure relief valve 14, the pressure relief valve 14 is installed on the top wall of the water injection tank 1, and the outlet of the air extractor 3 and the pressure relief valve 14 are respectively located at two ends of the gas phase flow space.

[0052] In the embodiment, specifically, the water vapor enters the gas phase flow space from the air extractor 3, and passes through the cold water spray, if the internal air pressure of the water injection tank 1 is still high, the high-pressure gas can be discharged through the pressure relief valve 14.

[0053] In the embodiment, the water injection tank 1 further includes a communicating pipe 15 and a water storage tank 16, one end of the communicating pipe 15 is connected to a second position of the side wall of the water injection tank 1, the other end is connected to the top wall of the water storage tank 16, the second position is lower than the first position, and the second position is higher than the lower end of the second baffle plate 8.

[0054] In the embodiment, specifically, in order to improve the utilization rate of water resources, the water in the water tank 1 is preferentially overflowed to the water storage tank 16 through the communication pipe 15 for reuse; when the water storage tank 16 is full, the excess water in the water tank 1 flows out through the overflow pipe 6.

[0055] In the specific embodiment, a water delivery pump 17 and a liquid level meter 18 are further included, the inlet of the water delivery pump 17 is connected to the lower end side of the water storage tank 16, the outlet of the water delivery pump 17 is connected to a water using device, and the liquid level meter 18 and the water delivery pump 17 are integrated in a DCS control system.

[0056] In the embodiment, specifically, the water delivery pump 17 and the liquid level meter 18 are interlocked controlled, when the liquid level of the water storage tank 16 is low, the water delivery pump 17 stops running to avoid the water delivery pump 17 from lacking water.

[0057] In the specific embodiment, the lower end side of the water tank 1 is connected to a sewage pipe 19, and the sewage pipe 19 is provided with a sewage valve 20.

[0058] In the embodiment, specifically, when the water tank 1 is operated for a long time, the sewage valve 20 can be opened to discharge the sewage in the water tank 1 when the waste heat boiler is stopped for maintenance, so that a large amount of scale is prevented from depositing in the water tank 1.

[0059] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A temperature regulating device for a water-jet steam ejector of a steam turbine, characterized in that, It comprises: a water jet part, which comprises a water jet tank, a water jet pump and an air extractor, the inlet of the water jet pump is connected to the lower end side of the water jet tank, the outlet of the water jet pump is connected to the nozzle of the air extractor through a water delivery pipe, and the outlet of the air extractor is connected to the upper end of the water jet tank; a water supplement part, which comprises a water supplement pipe, an overflow pipe, a plurality of first baffles and a plurality of second baffles, the water supplement pipe is connected to the top wall of the water jet tank, the plurality of first baffles and the plurality of second baffles are staggered in the upper space of the water jet tank, the upper end of the first baffle is fixedly connected to the top wall of the water jet tank, the lower end of the second baffle is lower than the lower end of the first baffle, the overflow pipe is connected to the first position of the side wall of the water jet tank, the first position is higher than the lower end of the second baffle and lower than the lower end of the first baffle, so as to stabilize the liquid level of the water jet tank between the lower end of the first baffle and the lower end of the second baffle, and form a gas phase baffle space in the upper part of the water jet tank. Wherein, the water supplement pipe is provided with a control valve, the water delivery pipe is provided with a temperature sensor, and the temperature sensor and the control valve are integrated in a DCS control system.

2. The steam turbine water jet type air extractor temperature regulating device according to claim 1, wherein the outlet of the air extractor and the overflow pipe are located at the far end of the top wall of the water jet tank.

3. The steam turbine water jet type air extractor temperature regulating device according to claim 1, further comprising a plurality of spray heads, and the plurality of spray heads are arranged in sequence on the top wall of the water jet tank, and the water supplement pipe is connected to the plurality of spray heads respectively.

4. The steam turbine water jet type air extractor temperature regulating device according to claim 1, further comprising a partition plate, which is arranged between the gas phase baffle space and the first position, and the lower end of the partition plate is lower than the lower end of the second baffle.

5. The steam turbine water jet type air extractor temperature regulating device according to any one of claims 1 to 4, further comprising a finned radiator, which comprises an S-shaped pipe and a set of radiating fins, the S-shaped pipe is embedded in the set of radiating fins, and the S-shaped pipe is communicated with the water delivery pipe.

6. The steam turbine water jet type air extractor temperature regulating device according to claim 5, wherein the finned radiator further comprises an axial flow fan, the axial flow fan and the set of radiating fins are arranged oppositely, and the temperature sensor and the axial flow fan are integrated in a DCS control system.

7. The steam turbine water jet type air extractor temperature regulating device according to claim 4, further comprising a pressure relief valve, which is arranged on the top wall of the water jet tank, and the outlet of the air extractor and the pressure relief valve are located at the two ends of the gas phase baffle space respectively.

8. The steam turbine water jet type air extractor temperature regulating device according to any one of claims 1 to 4, ​ ​ ​ ​ ​ ​ Further comprising a communication pipe and a water storage tank, one end of the communication pipe is connected to the second position of the side wall of the water jet tank, the other end is connected to the top wall of the water storage tank, the second position is lower than the first position, and the second position is higher than the lower end of the second baffle.

9. The water-jet steam ejector temperature control device of claim 8, wherein, Further comprising a water pump and a liquid level meter, the inlet of the water pump is connected to the lower end side of the water storage tank, the outlet of the water pump is connected to a water-using device, and the liquid level meter and the water pump are integrated in a DCS control system.

10. The water-jet steam ejector temperature control device of any one of claims 1 to 4, wherein, The lower end side of the water jet tank is connected to a blowdown pipe, and the blowdown pipe is provided with a blowdown valve.

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