CN110608071A

CN110608071A - Steam turbine for cracking gas device and cracking gas system

Info

Publication number: CN110608071A
Application number: CN201910986406.4A
Authority: CN
Inventors: 孔建强; 毛汉忠; 张科; 马晓飞; 杨雄民; 李宏福; 陈金铨; 周立明; 胡海良; 陆晋; 张超; 赵海维; 王红梅; 刘白兰; 黄华安
Original assignee: Hangzhou Steam Turbine Co Ltd
Current assignee: Hangzhou Steam Turbine Co Ltd
Priority date: 2019-10-17
Filing date: 2019-10-17
Publication date: 2019-12-24

Abstract

The application provides a steam turbine and pyrolysis gas system for pyrolysis gas device relates to steam turbine technical field, and overall structure adopts single cylinder single steam extraction to arrange, supports rotor system through the radial bearing of multiple pattern and size and guarantees that it possesses sufficient interval, good vibration performance and the interference killing feature of avoiding. The full-circumference steam inlet structure is adopted, the steam inlet flow channel is optimized, the structural strength and rigidity are enhanced, and the through flow is designed into a backflow structure, so that the axial thrust of the steam turbine is effectively reduced; the high-temperature side guide structure is adopted, so that cold and hot state gap change caused under a high-temperature operation environment and under a working condition sudden change condition can be prevented, and the problem of steam turbine cylinder alignment is solved; a detachable split valve regulating quick-closing valve structure is adopted, so that the mounting and dismounting inspection modes are simplified; the rigidity and the thermal stability of the exhaust cylinder are optimized in a multi-point supporting mode. Therefore, the single-machine capacity 100MW industrial steam turbine can drive a pyrolysis gas compressor unit which produces 150 ten thousand tons of ethylene every year, and the change requirements of each working condition and the rotating speed of the compressor unit are ensured.

Description

Steam turbine for cracking gas device and cracking gas system

Technical Field

The application relates to the technical field of steam turbines, in particular to a steam turbine for a pyrolysis gas device and a pyrolysis gas system.

Background

In a cracking gas system in the prior art, a steam turbine has large cold and hot deformation under variable load working conditions and during starting and stopping, particularly axial expansion and transverse deflection generated on a high-temperature steam inlet side, wherein the relative position between a main cylinder and a bearing seat is greatly changed due to the axial expansion, so that the rotation reliability of a rotor is reduced; the transverse deflection makes the turbine difficult to center, and the movable and static parts are rubbed to cause safety accidents;

in the prior art, the operating speed range of the turbine rotor for driving the compressor project is usually 70% -105% of the rated speed, which requires a wide avoidance band for the dynamic characteristics of the rotor system. Compared with a steam turbine for driving a generator, the vibration examination standard of the steam turbine for driving the compressor is much harsh. Factors such as sudden load change of a unit, large fluctuation of extraction pressure, change of extraction demand of downstream equipment, sudden extraction jump caused by faults of the downstream equipment and the like caused by switching of process working media can generate transient impact on a steam turbine rotor, and the loss caused by one shutdown of an ethylene project of 150 ten thousand tons per year is estimated to reach ten million RMB.

The operation working conditions of the unit are complex and changeable, the variation range of the steam extraction amount is large, the steam extraction amount accounts for 0-90%, two sections of through-flow thrust at the front and the rear of a steam extraction point are mutually influenced, the steam extraction pressure fluctuation range needs to be widened in order to reduce the steam extraction pressure protection outage rate caused by abnormal reasons, the steam extraction pressure fluctuation range is particularly widened to be 2.5-4.5 MPa aiming at 150 ten thousand tons/year ethylene projects, and the problem of complex thrust of the unit cannot be solved by a single-cylinder downstream structure in the prior art.

In addition, the large-scale high-temperature high-pressure unit usually adopts an integral steam inlet regulating valve quick-closing valve structure, so that the qualification rate of cast parts is reduced, the casting cost is increased, and the disassembly and inspection cost is high. And the large-scale condensing turbine for the large-scale high-temperature high-pressure unit has large steam exhaust area, large unit volume flow, low steam exhaust pressure, and large influence of vacuum suction on the steam exhaust cylinder and the rear bearing seat.

Disclosure of Invention

In view of this, the present application provides a steam turbine for a pyrolysis gas device and a pyrolysis gas system, and aims to solve the technical problem that in the prior art, the relative position between a rotor and a bearing seat is greatly changed due to axial expansion generated on a high-temperature steam inlet side of the steam turbine, and the rotation reliability of the rotor is reduced to a certain extent.

This application has still solved the horizontal beat that the steam turbine produced among the prior art to a certain extent and has made the steam turbine centering difficulty, appears that the sound part collides and wipes, leads to the technical problem of incident.

The technical problem that a rotor system of a steam turbine in the prior art cannot reach vibration check standards and cannot resist interference is solved to a certain extent.

The technical problem of complex unit thrust that prior art, the single cylinder following current structure of steam turbine exists has still been solved to a certain extent to this application.

This application has still solved to a certain extent among the prior art, adopts integral admission governing valve speed to close the valve structure, has reduced the cast part qualification rate, has increased casting cost, tears open the technical problem who examines with high costs simultaneously.

This application has still solved to a certain extent among the prior art, and steam exhaust cylinder and rear bearing seat receive vacuum suction to influence big technical problem.

In a first aspect, the present application provides a steam turbine for a cracked gas plant, comprising:

a master cylinder and a bank cylinder adjacent to each other;

a rotor rotatably disposed inside the master cylinder and the exhaust cylinder, a first end and a second end of the rotor being supported by a first bearing housing and a second bearing housing, respectively; the steam turbine for the pyrolysis gas device further comprises:

a first guide portion formed on the first bearing housing, the first guide portion having a first accommodating portion formed therein;

a second guide portion formed at the master cylinder, the second guide portion having a second receiving portion formed therein;

an insertion member provided in the first housing portion and the second housing portion, an outer side portion of the insertion member being in contact with an inner side portion of the first housing portion;

a first spacer member disposed between an outer side of the insert member and an inner side of the second receptacle, the outer side of the insert member urging the first spacer member against the inner side of the second receptacle.

Preferably, the number of the second guide parts is 2n +1, the number of the first guide parts is 2n +2, n is a natural number and n is more than or equal to 1;

the first and second guide portions are staggered with each other, and the (n + 1) th second guide portion is symmetrical with respect to an axis of the master cylinder.

Preferably, the steam turbine for a pyrolysis gas plant further comprises:

a second spacer member and a third spacer member provided to the first guide portion between two adjacent second guide portions, the second spacer member and the third spacer member being respectively provided to both side portions of the first guide portion facing the second guide portions;

the second spacing member is arranged on a first side part of the second guide part close to the axis of the main cylinder, and the third spacing member is arranged on a second side part of the second guide part far away from the axis of the main cylinder;

a first reserved gap is formed between the second spacing member and the first guide portion, a second reserved gap is formed between the third spacing member and the second guide portion, and the first reserved gap is larger than the second reserved gap.

Preferably, the steam turbine for the pyrolysis gas device is used for a 150 ten thousand ton/year ethylene pyrolysis gas device;

the main cylinder further comprises a steam inlet chamber arranged inside the main cylinder, and the upper end and the lower end of the steam inlet chamber are respectively provided with two steam interfaces, so that the steam inlet chamber can be used for steam inlet through the steam interfaces in the whole circumference; the steam inlet chamber is of a backflow structure.

Preferably, the steam turbine for the pyrolysis gas device further comprises a quick-closing valve and an adjusting steam valve which are arranged on the main cylinder, valve casings of the quick-closing valve and the adjusting steam valve are integrally formed, and the valve casings of the quick-closing valve and the adjusting steam valve are detachably connected with the main cylinder.

Preferably, the main cylinder further comprises a steam inlet, the steam inlet is communicated with two steam ports at the upper end or the lower end of the steam inlet chamber, and valve housings of the quick closing valve and the regulating steam valve are communicated with the steam inlet, so that the regulating steam valve can regulate the flow rate of the steam flowing through the steam ports.

Preferably, the master cylinder further comprises a first vane carrier ring and a second vane carrier ring, and the exhaust cylinder further comprises a third vane carrier ring;

the steam inlet chamber is installed 1 level of regulation level straight blade and 4 level pressure level straight blades, 6 level pressure level straight blades are installed to first guide vane carrier ring, 16 level pressure level straight blades are installed to second guide vane carrier ring, 3 levels of torsional blades are installed to third guide vane carrier ring.

Preferably, the first bearing seat is further provided with a first adjusting ring, and the first adjusting ring is matched with an outer ring of a bearing for supporting the rotor to rotate;

and the second bearing seat is also provided with a second adjusting ring, and the second adjusting ring is matched with an outer ring of a bearing for supporting the rotor to rotate. Preferably, the steam turbine for a pyrolysis gas plant further comprises:

the base is arranged at the lower end of the second bearing seat;

a base chassis for mounting the base;

the exhaust cylinder further formed with an exhaust cylinder boss mounted to the base chassis such that an axial dead center of the exhaust cylinder and the master cylinder falls at the exhaust cylinder boss and a lateral dead center of the exhaust cylinder and the master cylinder falls at a geometric center of the exhaust cylinder boss;

the lower end of the exhaust cylinder is connected with the lower end of the second bearing seat.

In a second aspect, the present application further provides a cracked gas system, including the above steam turbine for a cracked gas device, and further including a cracked gas device, where the steam turbine for a cracked gas device provides power for the cracked gas device.

This application will insert the component through first interval component and install in first portion and the second portion of holding, make the second guide part carry out axial expansion along with the master cylinder when, can drive first guide part and then drive primary shaft bearing and master cylinder synchronous motion through inserting the component, the relative position of the two is unchangeable, solve among the prior art axial expansion that steam turbine high temperature admission side produced to a certain extent and make the relative position between rotor and the bearing frame take place great change, reduce the technical problem of rotor gyration reliability.

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 shows a schematic view of an assembly drawing of a steam turbine for a pyrolysis gas plant;

FIG. 2 shows a schematic view of the view from the direction A in FIG. 1;

FIG. 3 shows a schematic view of a first view of the steam intake chamber of a steam turbine for a pyrolysis gas plant;

FIG. 4 shows a schematic view from a second perspective of the inlet chamber of a steam turbine for a pyrolysis gas plant;

FIG. 5 shows a schematic view of the cooperation of a first guide and a second guide of a steam turbine for a pyrolysis gas plant;

FIG. 6 shows a schematic view of a cross-sectional view taken along line C-C of FIG. 5;

FIG. 7 shows a schematic view of a cross-sectional view taken along line D-D of FIG. 5;

fig. 8 shows a schematic illustration of the manner of mounting the steam exhaust casing of the steam turbine for a pyrolysis gas plant.

Reference numerals:

1-a first bearing seat; 2-a thrust bearing; 3-a first radial bearing; 4-a first adjusting ring; 5-a first gland seal; 6-master cylinder; 7-a steam inlet chamber; 8-adjusting the valve to close the valve quickly; 9-an overflow outlet; 10-a first guide vane carrier ring; 11-a second gland seal; 12-a second vane carrier ring; 13-a third guide vane carrier ring; 14-a bank of cylinders; 15-a third vapor seal; 16-a barring gear; 17-a second adjusting ring; 18-a second radial bearing; 19-a second bearing block; 20-a rotor; 21-an overflow inlet; 22-steam extraction interface; 23-a steam inlet interface; 24-a first guide; 25-a second guide; 26-an insert member; 27-a first spacing member; 28-a third spacing member; 29-a second spacer member; 30-a cylinder bank projection; 31-adjusting the strap; 32-a base; 33-axial dead center; a-a steam interface; b-a first reserved gap; c-a second reserved gap.

Detailed Description

The technical solutions of the present application will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

FIG. 1 shows a schematic view of an assembly drawing of a steam turbine for a pyrolysis gas plant; FIG. 2 shows a schematic view of the view from the direction A in FIG. 1; FIG. 3 shows a schematic view of a first view of the steam intake chamber of a steam turbine for a pyrolysis gas plant; FIG. 4 shows a schematic view from a second perspective of the inlet chamber of a steam turbine for a pyrolysis gas plant; FIG. 5 shows a schematic view of the cooperation of a first guide and a second guide of a steam turbine for a pyrolysis gas plant; FIG. 6 shows a schematic view of a cross-sectional view taken along line C-C of FIG. 5; FIG. 7 shows a schematic view of a cross-sectional view taken along line D-D of FIG. 5; fig. 8 shows a schematic illustration of the manner of mounting the steam exhaust casing of the steam turbine for a pyrolysis gas plant.

Referring to fig. 1 to 8, the steam turbine for a cracked gas plant provided in this embodiment includes: the device comprises a first bearing seat, a main cylinder, a valve regulating quick-closing valve, an exhaust cylinder, a barring gear, a second bearing seat, a rotor and a base. The connection relationship and the operation principle of the above components will be described in detail below.

In this embodiment, the main cylinder 6 and the exhaust cylinder 14 are adjacently arranged, and the exhaust cylinder 14 is connected with the main cylinder 6 through a vertical flange, a large-sized steam turbine set in the prior art generally adopts a double-cylinder structure, but the double-cylinder structure can increase more equipment failure points relative to the single-cylinder structure, which is contrary to the system design principle of related projects in the petrochemical field, so that the steam turbine for the pyrolysis gas device in this embodiment is arranged by single-cylinder single-exhaust, and the arrangement of single-cylinder single-exhaust can lengthen the bearing span of the set, which will bring a certain degree of adverse effect on the vibration of the set, and for such adverse effect, the embodiment starts with the improvement of the bearing arrangement, and the arrangement mode thereof will be described in detail below.

In the present embodiment, the rotor 20 is disposed inside the master cylinder 6 and the exhaust cylinder 14, the rotation of the rotor 20 is supported by bearings installed inside both the first bearing housing 1 and the second bearing housing 19, and the first bearing housing 1 and the second bearing housing 19 are respectively provided with the first radial bearing 3 and the second radial bearing 18 that bear the radial load during the rotation of the rotor 20. In this embodiment, the first radial bearing 3 and the second radial bearing 18 may be mounted to the corresponding bearing seats by the first adjusting ring 4 and the second adjusting ring 17, respectively.

In the present embodiment, the above-described mounting method will be described by taking the first radial bearing 3 and the first adjusting ring 4 as examples. The inner ring of the first radial bearing 3 may be sleeved on the outer side portion of the first shaft end of the rotor 20 in an interference fit manner, the first adjusting ring 4 is disposed in the first bearing seat 1, and the first adjusting ring 4 may be sleeved on the outer ring of the first radial bearing 3 in an interference fit manner. The bearing seat is usually a welding part, the size of the position for accommodating the bearing is usually fixed, and the adjusting rings are additionally arranged, so that the adjusting rings with different inner diameters can be adapted to radial bearings with different outer diameters, the arrangement ensures good interchangeability in the assembling process, and the applicability of the bearing is also increased, therefore, the rotor 20 has enough avoiding intervals, excellent vibration performance and anti-interference performance under the radial support bearings with various types and sizes, the vibration checking standard of the steam turbine can be met, and the vibration performance and the rotation reliability of the rotor 20 are greatly improved.

In addition, the first bearing seat 1 accommodates a thrust bearing 2 inside, and the thrust bearing 2 is used for preventing the rotor 20 from axially shifting during rotation.

In this embodiment, a first steam seal 5 is disposed between the first shaft end of the rotor 20 and the main cylinder 6, a third steam seal 15 is disposed between the second shaft end of the rotor 20 and the exhaust cylinder 14, and a second steam seal 11 is further disposed inside the main cylinder 6, and the steam seals are labyrinth seals commonly found in the art, and the arrangement of the steam seals ensures that the steam pressure inside each working section of the main cylinder 6 and the exhaust cylinder 14 is relatively stable.

In this embodiment, the master cylinder 6 is further formed with a steam extraction port 22, an overflow inlet 21 and an overflow outlet 9. The steam extraction interface 22 is used for extracting steam from the inside of the main cylinder 6, a pipeline of the steam extraction interface 22 and a pipeline of the steam inlet chamber 7 which is described below are respectively provided with a differential pressure protection interface, a pressure measuring element is arranged on the differential pressure protection interface, remote monitoring of the steam extraction interface 22 and the steam inlet chamber 7 is realized, and when the differential pressure between the steam extraction interface 22 and the steam inlet chamber exceeds a preset value, an operator can control related measures such as steam extraction amount in time to improve so as to ensure that the steam turbine operates safely and stably. The overflow outlet 9 communicates with the overflow inlet 21 via a line for introducing steam into the chamber behind the second gland seal 11.

In this embodiment, the rotor 20 may be a solid forged drum rotor, the main cylinder 6 further includes an intake chamber 7, a first vane retaining ring 10 (i.e., a high pressure vane retaining ring in the art), a second vane retaining ring 12 (i.e., an intermediate pressure vane retaining ring in the art), and the exhaust cylinder 14 further includes a third vane retaining ring 13 (i.e., a low pressure vane retaining ring in the art), and the rotor 20 rotates inside the intake chamber 7 and the vane retaining rings.

In this embodiment, the steam turbine for the pyrolysis gas device may be designed as an impulse type, and the pressure stage may be designed as a reaction type, in this embodiment, the steam turbine for the pyrolysis gas device is used in a 150 ten thousand ton/year ethylene pyrolysis gas device, and its single machine power may reach 100MW, so preferably, the steam inlet chamber 7 may be installed with 1-stage adjustment stage straight blade and 4-stage pressure stage straight blade, the first vane retaining ring 10 may be installed with 6-stage pressure stage straight blade, the second vane retaining ring 12 may be installed with 16-stage pressure stage straight blade, and may also be installed on 2 second vane retaining rings 12 as preferable separable, and the third vane retaining ring 13 is installed with 3-stage twisted blades (i.e., low-pressure twisted blades in this field), so as to meet the power requirement of the steam turbine for the pyrolysis gas device.

It should be noted that the setting manner of the above adjusting stage and the pressure stage is a common setting manner in the prior art, and the installation manner of the guide vane carrier ring also belongs to the prior art, and only the stage number of the specific blade installation is given as a specific embodiment, and the rest is not described again.

In addition, in this embodiment, the steam inlet chamber 7 adopts a 360-degree full-circumference steam inlet backflow type two-half inner cylinder structure, that is, an upper half inner cylinder and a lower half inner cylinder, the two half inner cylinders are connected by bolts, two steam ports a are symmetrically formed in each of the upper half inner cylinder and the lower half inner cylinder of the steam inlet chamber 7, and the two steam ports a formed in the lower half inner cylinder are communicated with the steam inlet port 23 on the main cylinder 6. The working steam entering the steam turbine for the pyrolysis gas plant comes from the boiler and has high fresh steam parameters, which are usually: the temperature is 510-540 ℃, the pressure of new steam is 11-12 MPa, the pressure of extracted steam is 2.5-4.5 MPa, the arrangement mode is suitable for large-flow steam to flow in, the problem that the strength of the steam inlet chamber 7 and the main cylinder 6 is not enough can be effectively solved under the condition that the parameters of the new steam are higher, meanwhile, the through flow is designed into a backflow structure, the axial thrust of a steam turbine for a pyrolysis gas device can be effectively reduced, the safety and the stability of unit operation are ensured, and meanwhile, compared with an integral inner cylinder structure, the installation and disassembly cost of the steam inlet chamber is greatly reduced.

In addition, due to the adoption of the backflow type inner cylinder structure, the thrust caused by the change of the operation condition is balanced to change greatly by utilizing the thrust of the reverse flow of the steam, and the problem of complicated and variable steam thrust is also effectively solved.

In this embodiment, the valve-regulating quick-closing valve 8 is obtained by integrally forming (for example, by casting) a valve housing of the quick-closing valve and a valve housing of the steam-regulating valve, and can be detachably connected to the main cylinder 6 by connecting a waist-shaped flange joint surface on the upper end surface of the main cylinder 6 with bolts, the valve-regulating quick-closing valve 8 is formed with two valve body ports, and is communicated with the steam inlet port 23 on the main cylinder 6 through a pipeline, and controls the steam flow or closes the steam delivery through a valve disc of the steam-regulating valve.

The integrated into one piece of the valve casings of two valves has reduced the installation, has dismantled and overhauld the manpower that consumes, has practiced thrift the cost, and integrated into one piece's valve casing has also improved the security simultaneously to because the valve casings of two valves and master cylinder 6 are for dismantling to be connected, for the integral type setting among the prior art, improved the qualification rate of cast part, reduced casting cost, also reduced the cost of overhaul simultaneously.

In this embodiment, the lower end of the second bearing block 19 may be welded with the lower end of the exhaust cylinder 14, and a base 32 may be disposed at the lower end of the second bearing block 19, and the base 32 is mounted on a base chassis (not shown) to ensure stable support of the exhaust cylinder 14. The exhaust cylinder 14 may also be formed with a nose (known in the art as a "catclaw"), in this embodiment, two noses symmetrical about the axis of the exhaust cylinder 14 are formed, the exhaust cylinder nose 30 is mounted to the base chassis such that the axial dead centre 33 of the exhaust cylinder 14 and the master cylinder 6 falls on the exhaust cylinder nose 30 and the lateral dead centre of the exhaust cylinder 14 and the master cylinder 6 falls at the geometric centre of the exhaust cylinder nose 30, since said dead centre remains stationary when the exhaust cylinder 14 and the master cylinder 6 expand in the corresponding direction, and therefore the support provided there is also stable, which ensures the stability of the support of the exhaust cylinder 14 by the exhaust cylinder nose 30.

The exhaust cylinder 14 is supported at multiple points by the support of the exhaust cylinder protruding part 30 and the base 32, the rigidity of the exhaust cylinder 14 and the second bearing seat 19 is effectively improved, the thermal stability of the exhaust cylinder 14 is improved, the stability of the exhaust cylinder 14 and the second bearing seat 19 during operation is improved, and the internal air pressure of the exhaust cylinder 14 is always lower than the external atmospheric pressure during the operation of the exhaust cylinder 14, so that the second bearing seat 19 can bear larger vacuum suction force due to the pressure difference, and the problem that the second bearing seat 19 deforms under the vacuum suction force is solved by the arrangement mode of the multiple-point support.

In this embodiment, since the temperature of the side of the main cylinder 6 where the new steam flows is high, the cold-hot state deformation of the unit is large when the load changing condition and the start-stop are performed, especially, the axial expansion generated at the high-temperature steam inlet side causes the relative position between the rotor 20 and the bearing seat to change greatly, thereby reducing the rotation reliability of the rotor 20, and the transverse deflection will make the turbine difficult to center, and the friction between the moving and static parts occurs, which leads to a safety accident.

In this embodiment, the master cylinder 6 is also formed with a protrusion similar to the above-described cylinder bank protrusion 30, and is lapped over the upper end of the first bearing housing 1 for supporting the master cylinder 6.

In this embodiment, the lower end of the first bearing housing 1 can move in the axial direction of the main cylinder 6 by means of a rail or the like, the first bearing housing 1 is further formed with a first guide portion 24, the first guide portion 24 is formed with a first accommodating portion, the main cylinder 6 is further formed with a second guide portion 25, the second guide portion 25 is formed with a second accommodating portion, an insertion member 26 is provided in the first and second accommodating portions, a first partition member 27 (the first partition member 27 is preferably a standing key) is provided between the outer side portion of the insertion member 26 and the inner side portion of the second accommodating portion, and the outer side portion of the insertion member 26 forces the first partition member 27 against the inner side portion of the second accommodating portion.

In this embodiment, the second receiving portion may be a groove portion, the first receiving portion may be a hole portion, the extending direction of the groove portion and the extending direction of the hole portion are perpendicular to the axial direction of the master cylinder 6, and in a preferred arrangement, the insertion member 26 and the inner portion of the hole portion contact each other.

In the present embodiment, preferably, the insertion member 26 may be a column, the outer side portion thereof may have three flat surfaces so as to be engaged with the first spacing member 27, the shape of the first spacing member 27 in the present embodiment may be a member having an "L" shape in cross section, the insertion member 26 may be inserted into the first and second receiving portions, and then one end of the first spacing member 27 is disposed between the outer side portion of the insertion member 26 and the inner side portion of the second receiving portion, and the other end is fixed to the insertion member 26 by a screw, in the present embodiment, two of the first spacing members 27 are disposed between the outer side portion of the insertion member 26 and the inner side portion of the second receiving portion in such a manner as to correspond to the fixation of the insertion member 26 to the second receiving portion.

The above fixing is easy to disassemble, as shown in fig. 5, when the main cylinder 6 expands along the axial direction, the second guiding part 25 moves to the left in the figure, the inserting member 26 will abut against the inner side of the first accommodating part, and then the first guiding part 24 is forced to move together, so as to ensure that the relative position between the first bearing seat 1 and the main cylinder 6 is not changed any more.

The above arrangement solves the problem when the master cylinder 6 expands in the axial direction, and further, the present embodiment has the following arrangement with respect to the lateral runout of the master cylinder 6.

In the present embodiment, the number of the first guide portions 24 is 2n +1, the number of the second guide portions 25 is 2n +2, where n is a natural number and n ≧ 1, the first guide portions 24 and the second guide portions 25 may be arranged to be staggered with each other, and the (n + 1) th second guide portion 25 is symmetrical with respect to the axis of the main cylinder 6, and in this arrangement, there will necessarily be the first guide portion 24 located between two adjacent second guide portions 25, and on this basis, there may be further provided the second partition member 29 and the third partition member 28 provided to the first guide portion 24 located between two adjacent second guide portions 25, the second partition member 29 and the third partition member 28 may be provided to both side portions of the first guide portion 24 facing the second guide portion 25, respectively, the second partition member 29 may be provided to the first side portion of the second guide portion 25 near the axis of the main cylinder 6, the third partition member 28 may be disposed at a second side of the second guide portion 25 away from the axis of the main cylinder 6, a first reserved gap b may be formed between the second partition member 29 and the first guide portion 24, and a second reserved gap c may be formed between the third partition member 28 and the second guide portion 25, the first reserved gap b being greater than the second reserved gap c.

In the present embodiment, when n is 1, that is, the number of the first guide portions 24 is four, the number of the second guide portions 25 is three, the second guide portion 25 located in the middle (that is, the 2 nd second guide portion 25 from the top to the bottom in fig. 5) is symmetrical with respect to the axis of the main cylinder 6 (the first guide portion 24 and the second guide portion 25 which are staggered with each other are also symmetrical with respect to the axis of the main cylinder 6), the first guide portions 24 on both sides of the second guide portion 25 are provided with a combination of two sets of the second partition member 29 and the third partition member 28 in the above-described arrangement, and the second guide portions 25 located above and below in fig. 5 are provided with a combination of two sets of the first partition member 27, the insertion member 26, the first accommodating portion, and the second accommodating portion in the above-described arrangement, respectively.

Since the first clearance b is larger than the second clearance c, when the master cylinder 6 laterally deflects, the third partition member 28 always first abuts the second guide portion 25, and also, as shown in fig. 5, when the master cylinder 6 deflects upward in the drawing, the third partition member 28 positioned lowermost in the drawing first abuts the second guide portion 25 positioned therebelow, and the continuous deflection of the master cylinder 6 is restricted, and when the master cylinder 6 deflects downward in the drawing, the third partition member 28 positioned uppermost in the drawing first abuts the second guide portion 25 positioned thereabove, and the continuous deflection of the master cylinder 6 is restricted. In the present embodiment, the second guide portion 25 closer to the axis of the master cylinder 6 is heated to a greater degree, and the self-expansion that occurs is also greater, so the purpose of the first reserved gap b being greater than the second reserved gap c is also to reserve a larger space for the expansion of the second guide portion 25 that is greater in self-expansion.

According to the above-described features, it can be known that, when the second guide portion 25 expands by itself to make the first reserved gap b equal to the second reserved gap c, the second spacing member 29 will participate in the limitation of the lateral runout of the main cylinder 6 simultaneously with the third spacing member 28, and when the first reserved gap b is smaller than the second reserved gap c, the second spacing member 29 will replace the third spacing member 28 to limit the lateral runout of the main cylinder 6, which is opposite to the above-described limitation process of the third spacing member 28, and will not be described herein again.

Further, since the second guide portion 25 is moved laterally at the time of lateral runout, a lubricant may be further applied between the first spacer member 27 and the second guide portion 25, facilitating the movement of the second guide portion 25 relative to the first spacer member 27 within a small range.

It should be noted that:

first, the first guide portion 24 and the second guide portion 25 are provided symmetrically with respect to the axis of the master cylinder 6 in order to perform a symmetrical stopper function against lateral runout of the master cylinder 6.

Secondly, the value of n is not infinite, but can be limited by the person skilled in the art according to the actual production needs.

Thirdly, when the value of n is greater than 1, the second spacing member 29 and the third spacing member 28 may still be installed in the above-described arrangement, and for the insertion member 26 and the first spacing member 27, the second receiving portion may be provided only at the second guide portions 25 located at both sides, and the first receiving portion may be provided at the first guide portions 24 located at both sides of the two second guide portions 25, so that the insertion member 26 and the first spacing member 27 are installed, because in this installation manner, it is advantageous for the structure to have good assembly properties, while avoiding that the rigidity of the first guide portions 24 and the second guide portions 25 is reduced by providing too many receiving portions.

In addition, an adjusting part is further provided on the base 32, an adjusting strap 31 is provided at the lower end of the exhaust cylinder 14, and the adjusting part and the adjusting strap 31 are engaged in a manner similar to that of the first guide part 24, the second guide part 25, the second spacing member 29 and the third spacing member 28, so as to align the exhaust cylinder 14 with the second bearing seat 19, which will not be described again.

In addition, in the present embodiment, the steam turbine for the pyrolysis gas apparatus further includes a turning gear 16 disposed at the exhaust cylinder 14, and configured to turn the turning gear after the steam turbine for the pyrolysis gas apparatus is stopped or before the steam turbine is started.

The present embodiment further provides a pyrolysis gas system, including the steam turbine for the pyrolysis gas device as described above, and further including the pyrolysis gas device, and the beneficial effects of the pyrolysis gas system also include the above beneficial effects, which are not described herein again.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all changes that can be made in the details of the description and drawings, or directly/indirectly implemented in other related technical fields, are intended to be embraced therein without departing from the spirit of the present application.

Claims

1. A steam turbine for a cracked gas plant comprising:

a master cylinder and a bank cylinder adjacent to each other;

a rotor rotatably disposed inside the master cylinder and the exhaust cylinder, a first end and a second end of the rotor being supported by a first bearing housing and a second bearing housing, respectively; it is characterized in that the steam turbine for the pyrolysis gas device further comprises:

2. The turbine for a cracked gas plant as claimed in claim 1,

the number of the second guide parts is 2n +1, the number of the first guide parts is 2n +2, n is a natural number and is not less than 1;

3. The turbine for a pyrolysis gas plant of claim 2, further comprising:

4. The steam turbine for a cracked gas plant of claim 1, wherein the steam turbine for a cracked gas plant is used in a 150 million ton/year ethylene cracked gas plant;

5. The turbine for a cracked gas plant according to claim 4,

the steam turbine for the pyrolysis gas device further comprises a quick-closing valve and an adjusting steam valve which are arranged on the main cylinder, the quick-closing valve and the adjusting steam valve are integrally formed, and the quick-closing valve and the adjusting steam valve are detachably connected with the main cylinder.

6. The turbine for a cracked gas plant according to claim 5,

the main cylinder further comprises a steam inlet, the steam inlet is communicated with two steam interfaces at the upper end or the lower end of the steam inlet chamber, and valve casings of the quick closing valve and the adjusting steam valve are communicated with the steam inlet, so that the adjusting steam valve can adjust the flow of steam flowing through the steam interfaces.

7. The turbine for a cracked gas plant as claimed in claim 4, wherein said main cylinder further includes first and second vane carrier rings, and said exhaust cylinder further includes a third vane carrier ring;

8. The steam turbine for a pyrolysis gas plant according to any one of claims 1 to 7,

the first bearing seat is also provided with a first adjusting ring, and the first adjusting ring is matched with an outer ring of a bearing for supporting the rotor to rotate;

and the second bearing seat is also provided with a second adjusting ring, and the second adjusting ring is matched with an outer ring of a bearing for supporting the rotor to rotate.

9. The turbine for a pyrolysis gas plant according to any one of claims 1 to 7, characterized in that the turbine for a pyrolysis gas plant further comprises:

the base is arranged at the lower end of the second bearing seat;

a base chassis for mounting the base;

10. A cracked gas system comprising the turbine for a cracked gas plant as claimed in any one of claims 1 to 9 and further comprising a cracked gas plant, said turbine for a cracked gas plant powering said cracked gas plant.