Spraying device special for combustion test equipment of gas turbine

Abstract

A spraying device special for combustion test equipment of a gas turbine comprises a shell, an inlet flange and an outlet flange are installed at the two ends of the shell respectively, baffles are welded to two ports of the inner wall face of the shell respectively, and each baffle is provided with a small hole; a plurality of fixed supports are installed on the outer wall face, close to the inlet flange and the baffle, of the shell, each fixed support is provided with a nozzle through a flange cover, the nozzles are divided into a first nozzle and a second nozzle, a drainage connecting pipe is arranged at the bottom of the shell, and a connector flange is arranged at the head of the drainage connecting pipe; the first nozzle and the second nozzle are the same in structure, the mounting structure of the second nozzle comprises a steel pipe penetrating through a flange cover, the flange cover and the steel pipe are welded, one end of the steel pipe is provided with a connecting flange, the connecting flange is provided with a companion flange through a wound gasket and a fastener, and the other end of the steel pipe extends into the shell and is connected with an inner connector through an elbow. And the plug is arranged at the head part of the outer joint, so that the work is reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of spray devices, in particular to a spray device specially used for combustion test equipment of a gas turbine. Background Art

[0002] A gas turbine is an internal combustion power machine that uses continuously flowing gas as a working fluid to drive the impeller to rotate at high speed, converting the energy of the fuel into useful work. It is a rotating impeller heat engine.

[0003] In recent years, gas turbine combustion testing has become increasingly common among major enterprises, universities, and research institutes. During combustion testing, exhaust temperatures can reach as high as 1250°C. Without cooling, the exhaust system piping and instrumentation cannot withstand these temperatures. Furthermore, accurate measurement of exhaust temperature, pressure, composition, and other parameters is required to accurately calculate combustion test performance data. Traditional cooling methods simply spray water or blow cold air into the exhaust duct without precise control, resulting in significant water waste and suboptimal cooling. Utility Model Content

[0004] In response to the shortcomings of the above-mentioned existing production technology, the applicant provides a spray device specifically for gas turbine combustion test equipment, which can achieve automatic adjustment and precise control of exhaust gas cooling, effectively avoiding the defects of traditional exhaust gas cooling methods while further enhancing the cooling effect. The sprayer has a simple structure, strong adaptability, good cooling effect, and the instrument interface provided facilitates data collection, making it suitable for large-scale promotion and use.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] A spray device specifically for use in gas turbine combustion test equipment comprises a housing, with an inlet flange and an outlet flange mounted on each end of the housing, baffles welded to the two ends of the housing inner wall, each baffle having a small hole; a plurality of fixed supports mounted on the outer wall of the housing near the inlet flange and the baffle, each fixed support having a nozzle mounted on it via a flange cover, the nozzles being divided into two types, No. 1 and No. 2; a drainage pipe is disposed at the bottom of the housing, the head of which is provided with an interface flange;

[0007] The outer wall surfaces of the shell located on both sides of the fixed support are respectively welded with reinforcement rings;

[0008] The structures of nozzle No. 1 and nozzle No. 2 are the same, and the length of nozzle No. 1 is greater than that of nozzle No. 2;

[0009] The installation structure of nozzle No. 2 is as follows: it includes a steel pipe passing through the flange cover, the flange cover and the steel pipe are welded, a connecting flange is provided at one end of the steel pipe, the connecting flange is installed with a matching flange through a winding gasket and fasteners, the other end of the steel pipe extends into the interior of the outer shell and is connected to the inner joint through an elbow, the inner joint is covered with an outer joint, and a plug is installed on the head of the outer joint.

[0010] As a further improvement of the above technical solution:

[0011] The shell is a hollow thin-walled cylindrical structure.

[0012] There are four nozzles distributed in the outer circumferential direction of the shell, which are two No. 1 nozzles and two No. 2 nozzles, and the No. 1 nozzles and the No. 2 nozzles are arranged alternately.

[0013] The aperture of the small hole is 0.5-1 mm.

[0014] Each flange cover has twelve connection holes, which are connected to the fixed support with fasteners, and four threaded holes are reserved for installing detection instruments.

[0015] The flange cover is a square structure and is made of stainless steel plate. The thickness of the steel plate is about twice the thickness of the shell.

[0016] Nozzle No. 1 and No. 2 both use high-pressure atomizing nozzles.

[0017] The inlet flange adopts flat welding ring loose flange.

[0018] The outlet flange adopts neck butt welding flange.

[0019] The shell is made of 304 stainless steel.

[0020] The beneficial effects of the utility model are as follows:

[0021] This new utility model boasts a compact, rational structure and easy operation. It incorporates a set of high-pressure atomizing nozzles, which automatically control the water flow rate of a plunger pump via a PLC to precisely control exhaust gas temperature. The sprinkler is highly adaptable and can be adjusted to the various operating conditions of gas turbine combustion tests. Pre-set water atomization parameters automatically adjust during operation based on temperature sensors, ensuring rapid response. The high-pressure nozzles achieve excellent atomization efficiency, achieving a vaporization rate exceeding 95%. Cooling water is rapidly vaporized, virtually achieving zero wastewater discharge.

[0022] The sprayer of the utility model is specially designed for gas turbine combustion test, and the sprayer has a simple structure, is easy to manufacture, has strong adaptability and is relatively low in cost.

[0023] The sprayer of the utility model operates reliably in a high-temperature environment, and its performance meets the requirements of a gas turbine combustion test.

[0024] This utility model can effectively reduce the exhaust temperature during combustion engine tests according to test requirements, accurately control the exhaust temperature and pressure, and facilitate data collection. The exhaust temperature adaptability range is 450-1250°C, and the pressure range is 0.2-3.90MPa. The exhaust temperature can be accurately controlled below 450°C and the exhaust temperature can be adjusted online according to the experimental conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the present utility model.

[0026] Figure 2 This is a partial view (1) of the present utility model.

[0027] Figure 3 This is a partial view (2) of the present utility model.

[0028] Figure 4 This is a schematic structural diagram of the No. 2 nozzle of the utility model.

[0029] Figure 5 This is a schematic structural diagram of the No. 1 nozzle of the utility model.

[0030] Wherein: 1. Shell; 2. Reinforcement ring; 3. Fixed support; 4. Inlet flange; 5. Drain pipe; 6. Interface flange; 7. Stud; 8. Washer; 9. Nut; 10. Spiral wound gasket; 11. Matching flange; 12. Connecting bolt; 13. Flange cover; 14. Ceramic fiber gasket; 15. Outlet flange; 16. Nozzle No. 2; 17. Nozzle No. 1; 18. Baffle;

[0031] 1601. Connecting flange; 1602. Steel pipe; 1603. Elbow; 1604. Internal joint; 1605. External joint; 1606. Plug. DETAILED DESCRIPTION

[0032] The specific implementation of the present utility model will be described below with reference to the accompanying drawings.

[0033] like Figure 1-Figure 5 As shown, the spray device of this embodiment, which is specifically used for gas turbine combustion test equipment, includes a housing 1. An inlet flange 4 and an outlet flange 15 are respectively installed at both ends of the housing 1. Baffles 18 are respectively welded to the two ends of the inner wall of the housing 1, and each baffle 18 has a small hole. A plurality of fixed supports 3 are installed on the outer wall of the housing 1 near the inlet flange 4 and the baffle 18. Each fixed support 3 is mounted on a nozzle through a flange cover 13. The nozzles are divided into two types: nozzle 17 and nozzle 2 16. A drainage pipe 5 is provided at the bottom of the housing 1, and the head of the drainage pipe 5 is provided with an interface flange 6.

[0034] The outer wall surfaces of the housing 1 located on both sides of the fixed support 3 are respectively welded with reinforcement rings 2;

[0035] The structure of the first nozzle 17 and the second nozzle 16 is the same, and the length of the first nozzle 17 is greater than that of the second nozzle 16;

[0036] The installation structure of the No. 2 nozzle 16 is as follows: it includes a steel pipe 1602 passing through the flange cover 13, and the flange cover 13 and the steel pipe 1602 are welded. A connecting flange 1601 is provided at one end of the steel pipe 1602, and the connecting flange 1601 is installed with a matching flange 11 through a winding gasket 10 and fasteners. The other end of the steel pipe 1602 extends into the interior of the outer shell 1 and is connected to the inner joint 1604 through an elbow 1603. The inner joint 1604 is covered with an outer joint 1605, and a plug 1606 is installed on the head of the outer joint 1605.

[0037] The housing 1 is a hollow thin-walled cylindrical structure.

[0038] There are four nozzles distributed in the outer circumferential direction of the housing 1, namely two No. 1 nozzles 17 and two No. 2 nozzles 16, and the No. 1 nozzles 17 and the No. 2 nozzles 16 are arranged alternately.

[0039] The aperture of the small hole is 0.5-1 mm.

[0040] Each flange cover 13 is provided with twelve connection holes, which are connected to the fixed support 3 by fasteners, and four threaded holes are reserved for installing detection instruments.

[0041] The flange cover 13 is a square structure and is made of a stainless steel plate. The thickness of the steel plate is about twice the thickness of the housing 1.

[0042] No. 1 nozzle 17 and No. 2 nozzle 16 both adopt high-pressure atomizing nozzles.

[0043] The inlet flange 4 adopts a flat welding ring loose flange.

[0044] The outlet flange 15 is a butt-welding flange with a neck.

[0045] The housing 1 is made of 304 stainless steel.

[0046] like Figure 1 As shown, the utility model is used to cool the exhaust gas of a combustion engine and obtain parameters such as the temperature, pressure and gas composition in the exhaust gas, so as to accurately evaluate combustion test data and predict the performance of a test piece.

[0047] from Figure 1 It can be seen that the sprinkler mainly includes: outer shell 1, reinforcement ring 2, fixed support 3, inlet flange 4, drain pipe 5, interface flange 6, stud 7, gasket 8, nut 9, spiral wound gasket 10, matching flange 11, connecting bolts 12, flange cover 13, ceramic fiber gasket 14, and outlet flange 15.

[0048] A set of high-pressure atomizing nozzles is provided on the housing 1, including two No. 1 nozzles 17 and two No. 2 nozzles 16, which are evenly distributed around the periphery and arranged alternately. A baffle 18 is provided at the front and rear ends of the four nozzles and welded to the housing 1.

[0049] Each nozzle is welded to the flange cover 13. Each flange cover 13 has twelve connection holes, which are fixed to the fixed support 3 with fasteners. Four threaded holes are reserved for installing detection instruments.

[0050] A drainage pipe 5 is welded under the shell 1 to discharge excess unevaporated sewage.

[0051] The front and rear of the shell 1 are an inlet flange 4 and an outlet flange 15. The inlet flange 4 adopts a flat welding ring loose flange, and the outlet flange 15 adopts a neck butt welding flange.

[0052] The baffle 18 is provided to facilitate uniform distribution of airflow and is made of porous steel plate.

[0053] During a combustion test of a gas turbine, the sprinkler inlet flange 4 is connected to the gas turbine exhaust nozzle. The water spray flow rate is controlled according to a pre-set program to achieve the desired exhaust temperature. The water spray volume is adjusted based on feedback from the exhaust temperature signal to achieve the desired combustion test. The number and size of the baffle openings are optimized based on the temperature and pressure distributions obtained from the flow field calculation results. The sprinkler diameter is determined based on the exhaust pressure and flow rate during the combustion test. A pre-designed model can be used for a flow rate of 20 m / s, and the structural dimensions can be optimized based on flow field simulation results. Baffle 18 optimizes the flow field, enhancing mixing of atomized water and hot flue gas, promoting rapid vaporization of water droplets, and enhancing the cooling effect. The initial aperture diameter of the openings in baffle 18 can be set between 0.5 and 1.0 mm. Numerical simulations are performed to simulate the water spray atomization effect and examine the evaporation of water droplets. During the combustion test of a gas turbine, the holes in baffle 18 regulate the flue gas flow field and prevent flue gas disturbances that can lead to uneven temperature distribution. The baffle 18 is designed to have a detachable structure, and baffle structures with different apertures can be used according to different smoke flow rates.

[0054] The operation of the drainage pipe 5 is to discharge some unvaporized water droplets in the event of an accident or startup or shutdown, while also considering drainage during cleaning and pressure testing.

[0055] The inlet flange 4 adopts a flat welding ring loose flange, which is conducive to absorbing thermal expansion, simplifying the structure and reducing construction difficulty.

[0056] The outlet flange 15 adopts a neck-welded flange, which can withstand the impact of airflow reverse thrust and thermal stress.

[0057] The reinforcement rings 2 increase structural strength, reduce shell wall thickness, and reduce the weight of the sprinkler. The reinforcement rings 2 are located on both sides of the fixed support 3 and are at least as thick as the shell wall. The sprinkler's overall structure is simple, making it easy to manufacture and install on site.

[0058] from Figure 4 and Figure 5 As can be seen, nozzles 17 and 16 have the same structure, both being high-pressure atomizing nozzles capable of withstanding a maximum water pressure of 12 MPa. A single nozzle has a flow rate of 0 to 4.5 L / s, while four nozzles can provide a water spray flow rate ranging from 0 to 18 L / s. A high-pressure plunger pump supplies water to the nozzles. After being atomized by the nozzles, the high-pressure water mixes with the high-temperature flue gas within the sprinkler, rapidly reducing the flue gas temperature. The alternating arrangement of nozzles 17 and 16 helps to distribute the flue gas temperature field. The nozzle water flow rate is automatically adjusted based on the temperature sensor signal to optimize the temperature distribution within the flue gas. The design of nozzles 17 and 16 is based on flow field calculations and experimental verification within the sprinkler. Nozzle 17 has a large spray hole and low velocity, while nozzle 16 has a small spray hole and high velocity. Nozzle aperture and water spray pressure are key factors influencing atomization and cooling efficiency.

[0059] In actual work process:

[0060] The test steps are as follows:

[0061] First, the sprinkler structure is designed based on the theoretical exhaust parameters of the gas turbine, and numerical simulations are performed. The design process focuses on the nozzle and front and rear baffle configurations. The nozzle length, number of nozzle holes, and aperture size all significantly influence the atomization effect. The length of the No. 1 nozzle (17) is based on the sprinkler radius, and the segment nozzle should be initially designed to be 1 / 2 of the sprinkler radius. The sprinkler inlet flange must be designed to match the combustion nozzle flange of the gas turbine. The position and opening size of the front and rear baffles should also be optimized and adjusted based on flow field calculations. Generally, the front baffle should be positioned no less than the sprinkler radius from the nozzle, and the rear baffle should be positioned approximately 150 mm in front of the weld seam of the sprinkler outlet flange. During the gas turbine combustion test, the designed sprinkler is installed on the tail nozzle of the combustion test piece. After installation, a water spray test is performed, and all excess liquid is drained. The relationship between the weight of unatomized liquid and the exhaust temperature is carefully examined. If a large amount of discharged wastewater indicates poor atomization, the nozzle design and flow control need to be re-optimized. If the exhaust temperature does not reach the ideal value, consider whether the sprinkler diameter and length are designed appropriately. After the combustion test begins, monitor the readings of the four temperature sensors. Once the temperature stabilizes, turn on the water pump to begin spraying water. The PLC automatically adjusts the water flow rate from each nozzle based on the set temperature. The combustion test is short, and the collected data is stored in real time in the PLC. During each test, carefully monitor temperature and pressure changes and set appropriate adjustment ranges to ensure the water flow rate can be precisely controlled by the water plunger pump, ensuring consistent temperatures at all four nozzle locations. Gas turbine combustion tests simulate diverse operating conditions, resulting in varying flame temperatures and exhaust flow rates. Therefore, precise control of water pressure and atomization parameters is crucial for achieving optimal cooling performance. The nozzle atomization performance plays a significant role in cooling effectiveness. A well-performing sprinkler must achieve uniform temperature and flow distribution while conserving water. Finally, the test data is collated and compared to the theoretical calculations. Generally, an error within ±5°C for temperature and ±10% for pressure is considered normal. If the error exceeds the range, consider whether the test measurement accuracy or theoretical calculation method is appropriate.

[0062] The sprayer of the utility model has a simple structure, strong adaptability, good cooling effect, and an arranged instrument interface facilitates data collection, and is suitable for large-scale promotion and use.

[0063] The sprayer of the utility model is made of 304 stainless steel, which is easy to process, easy to assemble and durable.

[0064] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the scope of protection of the utility model.

Claims

1. A spray device specifically for use in a combustion test equipment for a gas turbine, characterized in that: The invention comprises a shell (1), wherein both ends of the shell (1) are respectively provided with an inlet flange (4) and an outlet flange (15), and baffles (18) are respectively welded to the two ends of the inner wall of the shell (1), and each baffle (18) is provided with a small hole; a plurality of fixed supports (3) are installed on the outer wall of the shell (1) near the inlet flange (4) and the baffle (18), and a nozzle is installed on each fixed support (3) through a flange cover (13), and the nozzles are divided into two types: a first nozzle (17) and a second nozzle (16); a drainage pipe (5) is provided at the bottom of the shell (1), and an interface flange (6) is provided at the head of the drainage pipe (5); Reinforcement rings (2) are respectively welded to the outer wall surfaces of the housing (1) located on both sides of the fixed support (3); The first nozzle (17) and the second nozzle (16) have the same structure, and the length of the first nozzle (17) is greater than that of the second nozzle (16); The installation structure of the second nozzle (16) is as follows: it includes a steel pipe (1602) passing through the flange cover (13), the flange cover (13) and the steel pipe (1602) are welded, one end of the steel pipe (1602) is provided with a connecting flange (1601), the connecting flange (1601) is installed with a matching flange (11) through a winding gasket (10) and fasteners, the other end of the steel pipe (1602) extends into the interior of the shell (1) and is connected to the inner joint (1604) through an elbow (1603), the inner joint (1604) is covered with an outer joint (1605), and a plug (1606) is installed at the head of the outer joint (1605).

2. A spray device specifically for use in a gas turbine combustion test device according to claim 1, characterized in that: The shell (1) is a hollow thin-walled cylindrical structure.

3. The spray device specifically for use in a gas turbine combustion test device according to claim 1, characterized in that: There are four nozzles distributed in the outer circumferential direction of the shell (1), namely two No. 1 nozzles (17) and two No. 2 nozzles (16), and the No. 1 nozzles (17) and the No. 2 nozzles (16) are arranged alternately.

4. The spray device specifically for use in a gas turbine combustion test device according to claim 1, characterized in that: The aperture of the small hole is 0.5-1 mm.

5. The spray device specifically for use in a gas turbine combustion test device according to claim 1, characterized in that: Each flange cover (13) is provided with twelve connection holes, which are connected to the fixed support (3) by fasteners, and four threaded holes are reserved for installing detection instruments.

6. The spray device specifically for use in a gas turbine combustion test device according to claim 1, characterized in that: The flange cover (13) is a square structure and is made of a stainless steel plate, the thickness of which is approximately twice the thickness of the outer shell (1).

7. The spray device specifically used for a gas turbine combustion test equipment according to claim 1, characterized in that: No. 1 nozzle (17) and No. 2 nozzle (16) both adopt high-pressure atomizing nozzles.

8. The spray device specifically for use in a gas turbine combustion test device according to claim 1, characterized in that: The inlet flange (4) adopts a flat welding ring loose flange.

9. The spray device specifically used for a gas turbine combustion test equipment according to claim 1, characterized in that: The outlet flange (15) adopts a neck butt welding flange.

10. The spray device specifically used for a gas turbine combustion test equipment according to claim 1, characterized in that: The outer shell (1) is made of 304 stainless steel.

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