Welded inlet cylinder for negative pressure inlet steam turbine

Abstract

The application provides a welded inlet cylinder of a negative pressure inlet steam turbine, and relates to the technical field of steam turbine equipment, so as to optimize the structure of the inlet cylinder of the steam turbine, improve the adjusting performance, and make the steam turbine adapt to the steam volume flow after waste water flash evaporation of a large oil refining device. The welded inlet cylinder of the negative pressure inlet steam turbine comprises a cylinder main body, the length of the cylinder main body is 2500mm-3000mm, the width of the cylinder main body is 3000mm-3500mm, and the height of the cylinder main body is 3000mm-3500mm; an inlet port and an exhaust port are arranged on the cylinder main body, the inlet port is communicated with a flash evaporation tank, the area of the inlet port is 1.8m 2 -3.6m 2 , and the exhaust port is communicated with an exhaust cylinder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam turbines, in particular to a welded inlet cylinder of a negative pressure inlet steam turbine. BACKGROUND

[0002] In the field of petroleum and chemical industry, a large amount of industrial wastewater is generated in the process of cracking, fractionation, reforming and synthesis of petroleum, and the temperature of the wastewater is usually above 30 DEG C. If the wastewater is directly discharged into the environment, not only the environment will be polluted by heat, but also the heat will be wasted.

[0003] A large oil refining device generates a large amount of hot water at about 96 DEG C per hour. The hot water is originally pumped into a specially designed plate heat exchanger by a circulating water pump for heat exchange, and is cooled to 81 DEG C to provide various equipment in the oil refining process. The heat exchange water is heated from 81 DEG C to 96 DEG C, and the system is cooled by the heat source. The cold end is wasted.

[0004] If the 96 DEG C hot water is flashed into 0.05 MPa (A) saturated steam for power generation, and the temperature of the 96 DEG C hot water is reduced to 81.3 DEG C after flashing, the discharge amount of circulating cooling water can be reduced, the influence on the environment can be reduced, the supply of plant power can be increased, the carbon emission can be reduced, and the economic and social benefits of the entire device can be improved.

[0005] A steam turbine is a rotary power machine that converts the heat energy contained in water vapor into mechanical energy. According to the main steam pressure, the steam turbine can be divided into seven types: low pressure, medium pressure, high pressure, super-high pressure, subcritical, supercritical and ultra-supercritical. The inlet pressure usually varies from low to high, between 0.12 MPaA and 32 MPaA, but is higher than atmospheric pressure. There is no steam turbine with an inlet pressure below atmospheric pressure on the market.

[0006] The cylinder is one of the main components of the steam turbine, which isolates the steam flowing into the steam turbine from the outside, forms a closed flow space for the steam, and completes the energy conversion.

[0007] The existing steam turbine usually has a main valve and a new steam regulating valve. The main valve has a quick closing check function, and the new steam regulating valve is opened in stages to adjust the steam flow of the steam turbine. However, the existing structure is only suitable for steam volume flow within 25 m 3 / s, but the steam volume flow of the wastewater generated by a large oil refining device after flashing is as high as 90 m 3 / s. If the existing structure is used, four steam turbines are needed to absorb all the ultra-low pressure steam, and the pressure difference between the inlet and outlet of the ultra-low pressure inlet steam turbine is very small, with a maximum of 40 KPa. The pressure loss of the quick closing valve and the inlet regulating valve of the conventional steam turbine is relatively large, and the adjusting performance is poor.

[0008] Therefore, it is urgent to provide a negative pressure inlet steam turbine welding inlet cylinder to solve the problems in the prior art to some extent. SUMMARY

[0009] The purpose of the present application is to provide a negative pressure inlet steam turbine welding inlet cylinder to optimize the structure of the steam turbine inlet cylinder to some extent, improve the adjustment performance, and make it suitable for large-scale oil refining device steam volume flow after waste water flashing.

[0010] The negative pressure inlet steam turbine welding inlet cylinder provided by the present application comprises a cylinder main body, the length of the cylinder main body is 2500mm-3000mm, the width is 3000mm-3500mm, and the height is 3000mm-3500mm; an inlet port and an exhaust port are formed on the cylinder main body, the inlet port is connected with a flash tank, the area of the inlet port is 1.8m 2 -3.6m 2 , and the exhaust port is connected with an exhaust cylinder.

[0011] Among them, the cylinder main body comprises an upper cylinder and a lower cylinder, the inlet port is formed at the top of the upper cylinder, and the bottom of the upper cylinder is connected with the lower cylinder.

[0012] Specifically, the lower cylinder comprises a baffle and an arc-shaped plate, the baffle is blocked at one end of the arc-shaped plate and connected with the arc-shaped plate, the positions of the baffle and the arc-shaped plate towards the upper cylinder are formed with a first flange part, and one end of the arc-shaped plate away from the baffle is formed with a second flange part; the upper cylinder is composed of a plurality of surrounding plates, and one side of the upper cylinder towards the lower cylinder is formed with a third flange part, the third flange part is opposite to the first flange part; one side of the upper cylinder away from the lower cylinder is formed with a fourth flange part, and the fourth flange part constitutes the inlet port, the side of the upper cylinder is formed with a fifth flange part, and the fifth flange part is opposite to the second flange part and the exhaust cylinder.

[0013] Further, the first flange part is formed with a connecting part close to one side of the baffle.

[0014] Among them, the outer wall surface of the arc-shaped plate is connected with a plurality of first reinforcing plates extending along the circumferential direction of the arc-shaped plate and a plurality of second reinforcing plates extending along the axial direction of the arc-shaped plate; a plurality of first reinforcing plates are arranged at intervals along the axial direction of the arc-shaped plate, and a plurality of second reinforcing plates are arranged at intervals along the radial direction of the arc-shaped plate.

[0015] Specifically, the two sides of the arc-shaped plate are connected with first reinforcing tubes, the first reinforcing tubes extend along the axial direction of the arc-shaped plate, and the two ends of the first reinforcing tubes are formed with first hoisting parts.

[0016] Further, the lower cylinder is provided with a first steam seal baffle, a guide plate and a support plate assembly extending axially along the arc-shaped plate, the upper cylinder is provided with a second steam seal baffle; the first steam seal baffle is connected with a first pipeline and a second pipeline, one end of the first pipeline away from the first steam seal baffle penetrates the arc-shaped plate to form a steam seal opening, one end of the second pipeline away from the first steam seal baffle penetrates the arc-shaped plate to form a drain opening, the second steam seal baffle is connected with a third pipeline; one end of the first steam seal baffle is connected with one end of the guide plate, and the other end of the guide plate is connected with the support plate assembly.

[0017] Wherein, the cylinder body is provided with a positioning ring and a plurality of support blocks along the circumference of the cylinder body, the positioning ring is used for positioning a guide vane holder ring, and the support blocks are used for supporting the guide vane holder ring.

[0018] Specifically, the upper cylinder is provided with a plurality of third reinforcing plates extending along the axial direction of the upper cylinder and a plurality of fourth reinforcing plates extending along the radial direction of the upper cylinder; a plurality of the third reinforcing plates are arranged at intervals along the circumference of the upper cylinder, and a plurality of the fourth reinforcing plates are arranged at intervals along the axial direction of the upper cylinder.

[0019] Further, the upper cylinder is further provided with a second reinforcing pipe extending along the axial direction of the upper cylinder, both ends of the second reinforcing pipe protrude from the upper cylinder, and the end portions are formed with second lifting portions.

[0020] Compared with the prior art, the welded admission cylinder of the negative pressure admission steam turbine provided by the application has the following advantages:

[0021] The welded admission cylinder of the negative pressure admission steam turbine provided by the application comprises a cylinder body, the length of the cylinder body is 2500mm-3000mm, the width is 3000mm-3500mm, and the height is 3000mm-3500mm; an admission port and a discharge port are formed in the cylinder body, the admission port is connected with a flash tank, the area of the admission port is 1.8m 2 -3.6m 2 , and the discharge port is connected with a cylinder discharge device.

[0022] According to the analysis, by setting the length of the cylinder body to be 2500mm-3000mm, the width to be 3000mm-3500mm, and the height to be 3000mm-3500mm, the volume of the admission cylinder can be increased, so that the area of the admission port can be 1.8m 2 -3.6m 2 . Since the admission speed of steam is usually between 25m / s and 50m / s, the area of the admission port in the application is set to be 1.8m 2 -3.6m 2The steam volume flow after the waste water of the large oil refining device is flashed can be satisfied, so that the quick closing valve and the new steam adjusting valve arranged at the steam inlet of the existing steam turbine can be omitted, and the steam can directly enter the steam cylinder by controlling the pressure difference between the flash tank and the condenser, so that the problems of relatively large pressure loss and poor adjusting performance caused by arranging the quick closing valve and the new steam adjusting valve can be avoided to a certain extent, and the space can be saved to a certain extent and the cost can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0024] Figure 1 The longitudinal section view of the steam cylinder main body in the welded steam inlet cylinder of the negative pressure steam inlet steam turbine provided by the embodiment of the present application is shown in the figure.

[0025] Figure 2 The longitudinal section view of the lower steam cylinder in the welded steam inlet cylinder of the negative pressure steam inlet steam turbine provided by the embodiment of the present application is shown in the figure.

[0026] Figure 3 The top view of the lower steam cylinder in the welded steam inlet cylinder of the negative pressure steam inlet steam turbine provided by the embodiment of the present application is shown in the figure.

[0027] Figure 4 The bottom view of the lower steam cylinder in the welded steam inlet cylinder of the negative pressure steam inlet steam turbine provided by the embodiment of the present application is shown in the figure.

[0028] Figure 5 The longitudinal section view of the upper steam cylinder in the welded steam inlet cylinder of the negative pressure steam inlet steam turbine provided by the embodiment of the present application is shown in the figure.

[0029] Figure 6 The top view of the upper steam cylinder in the welded steam inlet cylinder of the negative pressure steam inlet steam turbine provided by the embodiment of the present application is shown in the figure.

[0030] Figure 7 The bottom view of the upper steam cylinder in the welded steam inlet cylinder of the negative pressure steam inlet steam turbine provided by the embodiment of the present application is shown in the figure.

[0031] In the figure: 1-upper cylinder; 101-second steam seal baffle; 1011-third pipeline; 102-third reinforcing plate; 103-fourth reinforcing plate; 104-second reinforcing pipe; 1041-second hoisting part; 2-lower cylinder; 201-baffle; 202-arc plate; 2021-first reinforcing plate; 2022-second reinforcing plate; 203-first reinforcing pipe; 2031-first hoisting part; 204-first steam seal baffle; 2041-first pipeline; 2042-second pipeline; 205-drainage port; 206-guide plate; 207-support plate assembly; 2071-support plate; 2072-extension plate; 3-inlet; 4-first flanging part; 401-connection part; 5-second flanging part; 6-third flanging part; 7-fourth flanging part; 8-fifth flanging part; 9-positioning ring; 901-positioning ring reinforcing plate; 10-supporting block; 1001-supporting block reinforcing plate. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application and not all embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate the orientation or positional relationship shown in the drawings or the orientation or positional relationship commonly used when the product of the present application is used, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third", and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0034] In addition, the terms "horizontal", "vertical", and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0035] In the description of the embodiments of the present application, it should be noted that unless specifically stated and defined otherwise, the terms "set", "mounted", "connected", "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of the listed items.

[0037] For ease of description, spatial relationship terms such as "on", "upper", "below" and "lower" can be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relationship terms are intended to include the orientation depicted in the drawings in addition to different orientations of the device in use or operation.

[0038] The terms used herein are only used to describe various examples and are not intended to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "contain" and "have" enumerate the presence of the stated features, quantities, operations, components, elements and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements and / or combinations thereof.

[0039] Due to manufacturing techniques and / or tolerances, variations in the shapes illustrated in the drawings can occur. Therefore, the examples described herein are not limited to the specific shapes illustrated in the drawings, but include variations in the shapes that occur during manufacture.

[0040] The features of the examples described herein can be combined in various ways as will be apparent after the disclosure of the present application is understood. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after the disclosure of the present application is understood. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed by the present application.

[0041] As Figures 1-7As shown, the present invention provides a negative pressure steam inlet turbine welding inlet cylinder, including a cylinder body, the cylinder body has a length of 2500mm-3000mm, a width of 3000mm-3500mm, and a height of 3000mm-3500mm; a steam inlet 3 and a steam exhaust port are opened on the cylinder body, and the steam inlet 3 is connected to the flash tank, and the area of ​​the steam inlet 3 is 1.8m 2 -3.6m 2 , the exhaust port is connected to the exhaust cylinder.

[0042] Compared with the prior art, the negative pressure steam inlet steam turbine welding inlet cylinder provided by the present invention has the following advantages:

[0043] The negative pressure steam inlet turbine welding inlet cylinder provided by the present invention can increase the volume of the inlet cylinder by making the length of the cylinder body 2500mm-3000mm, the width 3000mm-3500mm, and the height 3000mm-3500mm, so that the area of ​​the steam inlet 3 can be 1.8m 2 -3.6m 2 Since the steam inlet velocity is usually between 25m / s and 50m / s, the area of ​​the steam inlet 3 in this application is set to 1.8m 2 -3.6m 2 It can meet the steam volume flow rate after flash evaporation of wastewater from large-scale oil refining units, thereby eliminating the need for the quick-closing valve and fresh steam regulating valve installed at the three steam inlets of the existing steam turbine. By simply controlling the pressure difference between the flash tank and the condenser, the steam can directly enter the cylinder to perform work, thereby avoiding to a certain extent the problems of relatively large pressure loss and poor regulation performance caused by the installation of the quick-closing valve and fresh steam regulating valve, and saving space and reducing costs to a certain extent.

[0044] It should be noted here that, based on the spatial layout and the required volume, preferably, the length, width and height dimensions of the cylinder body in this application are 2875 mm, 3260 mm and 3215 mm.

[0045] Alternatively, as Figures 1-7 As shown, the cylinder body includes an upper cylinder 1 and a lower cylinder 2 , a steam inlet 3 is formed at the top of the upper cylinder 1 , and the bottom of the upper cylinder 1 is connected to the lower cylinder 2 .

[0046] The upper cylinder 1 and the lower cylinder 2 in the application are detachably connected through a plurality of fasteners. Specifically, the lower cylinder 2 in the application comprises a baffle 201 and an arc-shaped plate 202. The baffle 201 is connected to one end of the arc-shaped plate 202 and blocks the arc-shaped plate 202. The baffle 201 and the arc-shaped plate 202 are provided with a first flange portion 4 at a position facing the upper cylinder 1. The arc-shaped plate 202 is provided with a second flange portion 5 at an end away from the baffle 201. The upper cylinder 1 is composed of a plurality of surrounding plates. The upper cylinder 1 is provided with a third flange portion 6 at a side facing the lower cylinder 2. The third flange portion 6 is opposite to the first flange portion 4. The upper cylinder 1 is provided with a fourth flange portion 7 at a side away from the lower cylinder 2. The fourth flange portion 7 constitutes an inlet 3. The upper cylinder 1 is provided with a fifth flange portion 8 at a side. The fifth flange portion 8 is opposite to the second flange portion 5 and the exhaust cylinder.

[0047] In the application, a plurality of alignment holes are formed in the third flange portion 6 and the first flange portion 4. Locking bolts are arranged in the alignment holes. The upper cylinder 1 and the lower cylinder 2 are connected through the alignment of the third flange portion 6 and the first flange portion 4 and the locking of the plurality of locking bolts.

[0048] Preferably, the fourth flange portion 7 is formed at an end of the upper cylinder 1 away from the third flange portion 6. The fourth flange portion 7 constitutes the inlet 3 in the application. Further preferably, the size of the inlet 3 in the application is 1260mm*2540mm, and the area is 3.2m 2 Thus, the operation requirement that the steam flow rate is not less than 28m / s can be met.

[0049] The second flange portion 5 formed by the lower cylinder 2 and the fifth flange portion 8 formed by the upper cylinder 1 jointly constitute a connecting area connected to the end of the exhaust cylinder. Thus, the connection between the exhaust cylinder and the inlet cylinder is more stable.

[0050] It should be noted that the plurality of surrounding plates of the upper cylinder 1 in the application comprise two side surrounding plates, two end surrounding plates, a conical plate and an arc-shaped plate. The two side surrounding plates, the two end surrounding plates, the conical plate and the arc-shaped plate are welded together. The baffle 201 and the arc-shaped plate 202 of the lower cylinder 2 are also welded together. Since the existing steam turbine inlet cylinder is mostly cast, the cost of casting is greatly increased due to the increase in the size of the inlet cylinder in the application. Therefore, the upper cylinder 1 and the lower cylinder 2 in the application are both welded together. Since the thickness of the plate does not need to be too large when the cylinder body is assembled by welding, the manufacturing cost can be reduced to a certain extent.

[0051] It needs to be further supplemented here that, since the new steam pressure in the application is negative pressure, the size of the steam inlet cylinder and the size of the steam inlet port 3 are increased, the pressure loss of the steam inlet port is reduced, and the pressure difference inside and outside the steam inlet cylinder is further reduced, so that the steam inlet cylinder does not need to bear excessive pressure difference, and then a plate with smaller thickness can be used to manufacture the steam inlet cylinder by welding. Also because the steam inlet and exhaust pressure difference in the steam inlet cylinder is very small, the quick closing valve and the steam inlet regulating valve in the existing steam turbine are cancelled, which can effectively avoid the problems of relatively large pressure loss and poor regulating performance.

[0052] Further, as shown in Figures 2-4 The connecting portion 401 in the application is a cat paw structure, which can connect the front bearing seat of the steam turbine, so that the front bearing seat can be installed with the front radial bearing and the thrust bearing, thereby realizing the support of the rotor of the steam turbine and bearing the thrust of the rotor.

[0053] Optionally, since the upper steam cylinder 1 and the lower steam cylinder 2 in the application are formed by welding, it is not necessary to use a plate with a larger thickness, and in order to enable the strength of the steam cylinder body to meet the operation pressure requirement, as shown in Figures 1-7 The outer wall surface of the arc-shaped plate 202 is connected with a plurality of first reinforcing plates 2021 extending along the circumferential direction of the arc-shaped plate 202 and a plurality of second reinforcing plates 2022 extending along the axial direction of the arc-shaped plate 202; the plurality of first reinforcing plates 2021 are arranged at intervals along the axial direction of the arc-shaped plate 202, and the plurality of second reinforcing plates 2022 are arranged at intervals along the radial direction of the arc-shaped plate 202, so that the first reinforcing plates 2021 and the second reinforcing plates 2022 arranged on the outer wall can improve the structural strength of the lower steam cylinder 2 to a certain extent.

[0054] Preferably, as shown in Figures 1-7 The upper steam cylinder 1 is provided with a plurality of third reinforcing plates 102 extending along the axial direction of the upper steam cylinder 1 and a plurality of fourth reinforcing plates 103 extending along the radial direction of the upper steam cylinder 1; the plurality of third reinforcing plates 102 are arranged at intervals along the circumferential direction of the upper steam cylinder 1, and the plurality of fourth reinforcing plates 103 are arranged at intervals along the axial direction of the upper steam cylinder 1, so that the plurality of third reinforcing plates 102 and the fourth reinforcing plates 103 can increase the overall strength of the upper steam cylinder 1, so that the steam cylinder body can adapt to the operation pressure requirement.

[0055] In order to further improve the strength of the steam cylinder body, as shown in Figures 1-7As shown, the first reinforcing pipe 203 is connected to both sides of the arc-shaped plate 202, extends along the axial direction of the arc-shaped plate 202, and has a first hoisting part 2031 at both ends of the first reinforcing pipe 203. The second reinforcing pipe 104 extends along the axial direction of the upper cylinder 1, and both ends of the second reinforcing pipe 104 protrude from the upper cylinder 1 and have a second hoisting part 1041 at the end.

[0056] The first hoisting part 2031 and the second hoisting part 1041 are arranged at both ends of the first reinforcing pipe 203 and both ends of the second reinforcing pipe 104, so that the upper cylinder 1 and the lower cylinder 2 can be hoisted stably. When the upper cylinder 1 and the lower cylinder 2 need to be connected, the first hoisting part 2031 and the second hoisting part 1041 can be used to connect and position the upper cylinder 1 and the lower cylinder 2.

[0057] When the upper cylinder 1 and the lower cylinder 2 are combined to form a cylinder body, the first hoisting part 2031 and the second hoisting part 1041 can also be used for movement.

[0058] The plurality of first reinforcing plates 2021 and the plurality of second reinforcing plates 2022 can improve the strength of the lower cylinder 2, and the plurality of third reinforcing plates 102, the plurality of fourth reinforcing plates 103, and the second reinforcing pipe 104 can improve the strength of the upper cylinder 1. The plurality of first reinforcing plates 2021 provide the necessary conditions for the arrangement of the first hoisting part 2031, and the first reinforcing pipe 203 can increase the strength of the plurality of first reinforcing plates 2021 in addition to hoisting the lower cylinder 2. The second reinforcing pipe 104 can increase the strength of the plurality of fourth reinforcing plates 103 in addition to hoisting the upper cylinder 1.

[0059] Further, as shown, Figures 1-7 The first sealing baffle 204 is connected with a first pipe 2041 and a second pipe 2042, one end of the first pipe 2041 away from the first sealing baffle 204 penetrates through the arc-shaped plate 202 to form a sealing port, one end of the second pipe 2042 away from the first sealing baffle 204 penetrates through the arc-shaped plate 202 to form a drain port 205, and the second sealing baffle 101 is connected with a third pipe 1011. One end of the first sealing baffle 204 is connected with one end of the flow guide plate 206, and the other end of the flow guide plate 206 is connected with the support plate assembly 207.

[0060] The support plate assembly 207 in the application comprises a support plate 2071 and an extension plate 2072, and the support plate assembly 207 is arranged along the circumference of the arc-shaped plate 202. The support plate 2071 can support and strengthen the guide vane 206 and the arc-shaped plate 202, one end of the support plate 2071 is connected with the bottom of the guide vane 206, and the other end and one end of the extension plate 2072 are provided with a connecting reinforcing plate. The extension plate 2072 extends along the axial direction of the arc-shaped plate 202, and the extension plate 2072, the support plate 2071 and the connecting reinforcing plate can increase the connecting strength of the arc-shaped plate 202.

[0061] As shown in Figures 1-7 The lower cylinder 2 is provided with a plurality of support blocks 10 for supporting the weight of the guide vane holding ring, and cooperates with the support blocks 10 of the upper cylinder 1 to jointly position the guide vane holding ring in the circumferential direction. A plurality of positioning ring reinforcing plates 901 are connected along the circumference of the positioning ring 9, and a plurality of support block reinforcing plates 1001 are connected corresponding to the support blocks 10, which can improve the stability and strength of the whole device to a certain extent.

[0062] The above only describes the preferred embodiments of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A welded inlet cylinder for a negative pressure inlet steam turbine, characterized by, The cylinder body has a length of 2500-3000 mm, a width of 3000-3500 mm and a height of 3000-3500 mm; The cylinder body is provided with an inlet and an outlet, the inlet is communicated with the flash tank, the area of the inlet is 1.8m 2 -3.6m 2 , and the outlet is communicated with the exhaust cylinder. The cylinder body comprises an upper cylinder and a lower cylinder, the steam inlet is formed at the top of the upper cylinder, and the bottom of the upper cylinder is connected with the lower cylinder; The lower cylinder comprises a baffle and an arc-shaped plate, the baffle is connected with one end of the arc-shaped plate, the baffle and the arc-shaped plate are provided with a first flanging part at the position facing the upper cylinder, and the other end of the arc-shaped plate away from the baffle is provided with a second flanging part; The upper cylinder is composed of a plurality of surrounding plates, and the side of the upper cylinder facing the lower cylinder is provided with a third flanging part, and the third flanging part is opposite to the first flanging part; The side of the upper cylinder away from the lower cylinder is provided with a fourth flanging part, and the fourth flanging part constitutes the steam inlet, the side of the upper cylinder is provided with a fifth flanging part, and the fifth flanging part is opposite to the second flanging part and the exhaust cylinder; A plurality of third reinforcing plates extending along the axial direction of the upper cylinder and a plurality of fourth reinforcing plates extending along the radial direction of the upper cylinder are arranged in the upper cylinder; A plurality of the third reinforcing plates are arranged along the circumferential direction of the upper cylinder, and a plurality of the fourth reinforcing plates are arranged along the axial direction of the upper cylinder.

2. The negative pressure admission turbine welded inlet cylinder of claim 1, wherein, The first flanging part is provided with a connecting part close to the side of the baffle.

3. The welded inlet cylinder for a negative pressure inlet steam turbine according to claim 1, characterized by A plurality of first reinforcing plates extending along the circumferential direction of the arc-shaped plate and a plurality of second reinforcing plates extending along the axial direction of the arc-shaped plate are connected to the outer wall surface of the arc-shaped plate; A plurality of the first reinforcing plates are arranged along the axial direction of the arc-shaped plate, and a plurality of the second reinforcing plates are arranged along the radial direction of the arc-shaped plate.

4. The welded inlet cylinder of a negative pressure inlet steam turbine according to claim 3, characterized in that, First reinforcing pipes are connected to both sides of the arc-shaped plate, the first reinforcing pipes extend along the axial direction of the arc-shaped plate, and first lifting parts are formed at both ends of the first reinforcing pipes.

5. The welded inlet cylinder of a negative pressure inlet steam turbine according to claim 4, characterized in that, A first steam seal baffle, a flow guide plate and a support plate assembly extending along the axial direction of the arc-shaped plate are arranged in the lower cylinder, and a second steam seal baffle is arranged in the upper cylinder; A first pipeline and a second pipeline are connected to the first steam seal baffle, one end of the first pipeline away from the first steam seal baffle penetrates the arc-shaped plate to form a steam seal opening, one end of the second pipeline away from the first steam seal baffle penetrates the arc-shaped plate to form a drain opening, and a third pipeline is connected to the second steam seal baffle; One end of the first steam seal baffle is connected with one end of the flow guide plate, and the other end of the flow guide plate is connected with the support plate assembly.

6. The negative pressure admission steam turbine welded admission casing of claim 1, wherein, A positioning ring and a plurality of support blocks are arranged along the circumferential direction of the cylinder body in the cylinder body, the positioning ring is used for positioning a guide vane holder ring, and the support blocks are used for supporting the guide vane holder ring.

7. The negative pressure admission steam turbine welded admission casing of claim 1, wherein, A second reinforcing pipe extending along the axial direction of the upper cylinder is arranged in the upper cylinder, both ends of the second reinforcing pipe protrude from the upper cylinder, and second lifting parts are formed at the ends.

Images