CN216741631U - Negative pressure admission condensing steam turbine based on flash evaporation technology - Google Patents

Abstract

The utility model provides a negative-pressure steam-admission condensing steam turbine based on a flash evaporation technology, and relates to the field of steam turbines. The negative pressure admission condensing turbine based on flash evaporation technology includes: the steam inlet cylinder is provided with a steam inlet for introducing negative pressure steam; the steam exhaust cylinder is communicated with the steam inlet cylinder to form a communication end, a steam exhaust port is formed in the steam exhaust cylinder and used for being connected with a condenser, and the steam exhaust port of the steam exhaust cylinder is communicated with the steam inlet of the condenser through a horizontally arranged connecting pipe; and the working assembly is arranged in a space communicated with the air inlet cylinder and the air exhaust cylinder. According to the negative pressure steam inlet condensing steam turbine based on the flash evaporation technology, the steam exhaust channel and the condenser are horizontally and axially arranged, so that the energy loss caused by flowing of negative pressure steam is reduced, and the residual speed utilization rate of the exhaust steam is improved.

Description

Negative pressure admission condensing steam turbine based on flash evaporation technology

Technical Field

The application relates to the field of steam turbines, in particular to a negative-pressure steam inlet condensing type steam turbine based on a flash evaporation technology.

Background

Large-scale oil refining device can produce a large amount of hot water in the process flows such as carrying out schizolysis, fractionation to petroleum, if with these hot water flash evaporation become negative pressure steam, let in these negative pressure steam in the steam turbine again, can be with the thermal energy conversion that contains in the negative pressure steam mechanical energy, so can carry out the reutilization to the energy to reduce the influence to the environment.

The inlet pressure of the existing steam turbine is set to be higher than the atmospheric pressure, and the steam turbine and the condenser are arranged in a layered mode. At the moment, exhaust steam generated by the steam turbine is discharged horizontally and axially and then enters the condenser vertically and downwards, the energy loss caused by overcoming the flow resistance of reversing of the exhaust steam is usually within 10kj/kg, and for the steam turbine with normal steam inlet parameters, namely the steam inlet pressure higher than the atmospheric pressure, the energy loss of 10kj/kg is within an acceptable range; however, for a steam turbine with negative pressure steam admission, in which the adiabatic enthalpy drop from the inlet to the outlet is only 225.7kj/kg, a cylinder loss of 10kj/kg is clearly unacceptable. In addition, when the steam turbine adopts negative pressure steam inlet, the pressure difference of inlet and outlet of the steam turbine is extremely small and only 40KPa at most, if the steam inlet pressure is adjusted by adopting a quick closing valve and a steam inlet adjusting valve of the existing steam turbine, the relative amount of pressure loss is large, and the adjusting performance is poor.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present application is to provide a negative pressure steam admission condensing steam turbine based on a flash evaporation technology, so as to solve the problem that the existing steam turbine is not suitable for negative pressure steam admission.

According to the above object, the present invention provides a negative pressure steam inlet condensing steam turbine based on a flash evaporation technology, wherein the negative pressure steam inlet condensing steam turbine based on the flash evaporation technology comprises:

the steam inlet cylinder is provided with a steam inlet to introduce negative pressure steam;

the exhaust cylinder is communicated with the air inlet cylinder to form a communication end, an exhaust port is formed on the exhaust cylinder and used for being connected with a condenser, and the exhaust port of the exhaust cylinder is communicated with the air inlet port of the condenser through a horizontally arranged connecting pipe; and

and the working assembly is arranged in a space communicated with the cylinder inlet and the cylinder outlet.

Preferably, a steam inlet of the steam inlet cylinder is provided with a steam inlet channel towards the communication end; the communicating end faces to a steam exhaust port of the steam exhaust cylinder to form a steam exhaust channel, and the steam exhaust channel is horizontally arranged.

Preferably, a steam inlet of the steam inlet cylinder is connected with a steam inlet flange, and the center of the steam inlet flange is superposed with the center of the steam inlet; the steam exhaust flange is connected to the steam exhaust port of the steam exhaust cylinder, and the center of the steam exhaust flange coincides with the center of the steam exhaust port.

Preferably, the cylinder inlet and the cylinder outlet are both welded to form an integral structure.

Preferably, a plurality of regulating valves are connected to the steam exhaust port, and each regulating valve can be independently controlled.

Preferably, the working assembly comprises a rotor, a driving end extending out of the cylinder is formed on the rotor, and a front bearing is arranged at the driving end; one end of the rotor close to the exhaust cylinder is provided with a rear bearing; the front bearing is a radial thrust integrated bearing.

Preferably, a sealing part is arranged on the rotor and comprises a front steam seal and a rear steam seal; the front steam seal is positioned at the position where the rotor is connected with the air inlet cylinder, and the rear steam seal is positioned at the communication end.

Preferably, a vane carrier ring and a vane assembly including a plurality of stationary vanes connected to the vane carrier ring and a plurality of moving vanes distributed along a circumferential direction of the rotor are further provided in the intake cylinder.

Preferably, the rotor is a monobloc rotor.

Preferably, the driving end of the rotor is connected with a turning gear.

According to the negative pressure steam inlet condensing steam turbine based on the flash evaporation technology, negative pressure steam is guided into the main body from the steam inlet of the steam inlet cylinder, flows to the steam outlet through the steam inlet cylinder and the steam outlet cylinder which are communicated with each other, and is guided into the condenser by the horizontally arranged connecting pipe for condensation and recovery, so that the steam outlet cylinder and the condenser are arranged in the same layer, energy loss caused by overcoming of reversing flow resistance of the negative pressure steam is effectively avoided, and heat energy in the negative pressure steam can be converted into mechanical energy through the acting assembly, namely the steam turbine is suitable for the negative pressure steam after flash evaporation.

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 is a cross-sectional view of a negative pressure steam admission condensing turbine based on flash vaporization technology according to an embodiment of the present invention;

fig. 2 is a partial schematic view of a negative pressure steam admission condensing turbine based on flash vaporization technology according to an embodiment of the present invention.

Icon: 1-a body; 2-a cylinder; 20-a steam inlet; 21-a steam inlet flange; 22-a hydrophobic port; 23-a first interface; 3-exhaust cylinders; 30-a steam outlet; 31-a steam exhaust flange; 32-a second interface; 4-a rotor; 50-front steam sealing; 51-rear steam sealing; 60-a front bearing; 61-rear bearing; 62-a bearing seat; 7-turning gear; 80-a guide vane holding ring; 81-moving blades; 82-stationary blades; 9-support column.

Detailed Description

The following detailed description is provided to assist the reader in obtaining a thorough understanding of the methods, devices, and/or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and/or systems described herein will be apparent to those skilled in the art in view of the disclosure of the present application. For example, the order of operations described herein is merely an example, which is not limited to the order set forth herein, but rather, variations may be made in addition to operations which must occur in a particular order, which will be apparent upon understanding the disclosure of the present application. Moreover, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

The features described herein may be embodied in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many possible ways to implement the methods, devices, and/or systems described herein that will be apparent after understanding the disclosure of the present application.

Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on," "connected to," coupled to, "over," or "overlying" another element, it may be directly "on," "connected to," coupled to, "over," or "overlying" the other element, or one or more other elements may be present therebetween. In contrast, when an element is referred to as being "directly on," "directly connected to," directly coupled to, "directly over" or "directly overlying" another element, there may be no intervening elements present.

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

Although terms such as "first", "second", and "third" may be used herein to describe various elements, components, regions, layers or sections, these elements, components, regions, layers or sections should not be limited by these terms. Rather, these terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section referred to in the examples described herein may be termed a second element, component, region, layer or section without departing from the teachings of the examples.

For ease of description, spatial relationship terms such as "above … …," "upper," "below … …," and "lower" may be used herein to describe one element's relationship to another element as illustrated in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "upper" relative to other elements would then be oriented "below" or "lower" relative to the other elements. Thus, the term "above … …" includes both an orientation of "above … …" and "below … …" depending on the spatial orientation of the device. The device may also be otherwise oriented (e.g., rotated 90 degrees or at other orientations) and the spatially relative terms used herein should be interpreted accordingly.

The terminology used herein is for the purpose of describing various examples only and is not intended to be limiting of the disclosure. The singular forms also are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and "having" specify the presence of stated features, quantities, operations, elements, components, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and/or combinations thereof.

Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, may be expected. Thus, the examples described herein are not limited to the particular shapes shown in the drawings, but include changes in shape that occur during manufacturing.

The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. Further, while the examples described herein have a variety of configurations, other configurations are possible, as will be apparent after understanding the disclosure of the present application.

As shown in fig. 1 to 2, the negative pressure steam intake condensing turbine based on the flash evaporation technology of the present embodiment may include an intake cylinder 2, an exhaust cylinder 3, and the like connected to each other. Hereinafter, a detailed structure of the above-described components of the negative pressure steam admission condensing turbine based on the flash evaporation technology according to the present invention will be described in detail.

As shown in fig. 1 to 2, in the present embodiment, the intake cylinder 2 and the exhaust cylinder 3 are connected to each other to form the main body 1 of the steam turbine, and the main body 1 is formed in a quasi-cylindrical structure, but the size thereof, i.e., the size of the intake cylinder 2 and the exhaust cylinder 3, is not particularly limited and should be determined according to actual circumstances such as the displacement volume of the steam turbine, etc.

In the present embodiment, as shown in fig. 1 to 2, the intake cylinder 2 is provided in an L-shape, i.e., the intake cylinder 2 is formed with an L-shaped intake passage, a vertical portion thereof for intake of steam, and a horizontal portion thereof for communication with the exhaust cylinder 3. Specifically, a steam inlet 20 is formed at the top end of the vertical part, a steam inlet flange 21 is arranged at the steam inlet 20, and negative pressure steam in the flash tank can be guided into the steam inlet 2 through the steam inlet 20 after passing through the steam inlet connecting pipe through the steam inlet flange 21. The shape of the steam inlet flange 21 is matched with that of the steam inlet 20, and the center of the steam inlet flange 21 is superposed with that of the steam inlet 20, so that the connection stability of the steam inlet connecting pipe can be further ensured; however, the area of the steam inlet flange 21 should be determined according to the actual conditions, such as the inlet volume flow and the inlet flow rate, and for example, when the inlet volume flow is large or the inlet flow rate is small, the area of the steam inlet flange 21 should be set slightly larger. Furthermore, a drain 22 is provided at the side of the horizontal part of the cylinder 2 facing away from the inlet 20 to facilitate the outflow of condensation water inside the cylinder during the starting phase.

It should be noted that, in order to avoid unnecessary loss of energy of the negative pressure steam itself, the steam inlet 20 cannot be disposed at the bottom of the steam inlet cylinder 2; however, if the large steam inlet 20 is formed at the side of the steam inlet cylinder 2, i.e. the steam inlet mode is tangential steam inlet, it is inconvenient to install other components on the main body 1 because the volume flow of the negative pressure steam is too large, so it is the best choice to arrange the steam inlet 20 at the top end of the steam inlet cylinder 2, i.e. to let the negative pressure steam flow into the cylinder from top to bottom. The size of the steam inlet 20 is determined according to the actual steam inlet amount, and the actual steam inlet amount is determined by the flash pressure and the input amount of the high-pressure saturated water of the flash tank.

In addition, a first connection port 23 for introducing negative pressure steam into the exhaust cylinder 3 is formed at one end of the horizontal portion of the intake cylinder 2, which is far from the vertical portion, and the first connection port 23 is connected to the exhaust cylinder 3 through a flange, thereby achieving communication between the intake cylinder 2 and the exhaust cylinder 3. The shape, size, and the like of the first port 23 are not particularly limited as long as the efficiency of energy conversion of the turbine can be ensured. Further, the size, shape, etc. of the flange at the position of the first port 23 are sufficient as long as the intake cylinder 2 and the exhaust cylinder 3 can be stably communicated to form a complete passage from the flash tank to a condenser described below.

In the present embodiment, as shown in fig. 1, the exhaust cylinder 3 is a horizontally disposed cylindrical structure, and it is formed with a horizontal exhaust passage. A second port 32 corresponding to the first port 23 is formed at one end of the exhaust cylinder 3, that is, the end is a connection end; and a steam discharge port 30 for connecting a condenser to condense the discharged negative pressure steam is formed at an end of the steam discharge cylinder 3 opposite to the connection end. In the present embodiment, the steam inlet and the steam outlet 30 of the condenser are communicated with the horizontally arranged connecting pipe through the steam discharging flange 31, and the center of the steam discharging flange 31 coincides with the center of the steam outlet 30 of the steam discharging cylinder 3, thereby avoiding unnecessary energy loss. When the center of the exhaust flange 31 coincides with the center of the exhaust port 30, the shape, size, and the like of the exhaust flange 31 may be adapted to the exhaust port 30 so as to guide the negative pressure steam.

Furthermore, a plurality of control valves are connected to the steam outlet 30 of the steam turbine, which control valves can be arranged at the steam inlet of the condenser or at a connection for connecting the steam outlet 30 to the steam inlet of the condenser. The regulating valve controls the exhaust pressure at the turbine exhaust port 30 by controlling the condenser vacuum to control the rotational speed of the rotor 4 of the turbine as described below. Specifically, when the opening of the regulating valve is decreased, the pressure at the steam outlet 30 is decreased, and the flow resistance of the steam inside the turbine is decreased, so that the pressure at the steam inlet 20 of the steam inlet cylinder 2 is decreased, which in turn causes the resistance of the negative pressure steam generated by, for example, the flash tank to enter the turbine to be decreased, i.e., more negative pressure steam can enter the turbine, which in turn increases the work of the turbine; when the opening of the regulating valve is increased, the pressure at the steam outlet 30 is increased, so that the pressure at the steam inlet 20 of the steam inlet cylinder 2 is increased, the resistance of the negative pressure steam entering the inside of the steam inlet cylinder 2 is increased, the steam inlet amount is reduced, and the work of the steam turbine is reduced.

The regulating valve has the functions and is based on the characteristic that the steam inlet quantity of the negative pressure steam inlet turbine is greatly influenced by back pressure, namely steam exhaust pressure, which is different from the existing pressure steam turbine. In addition, can replace shut-off valve and the control valve that sets up in the admission department among the current steam turbine through this governing valve, need not to control admission flow and break-make through shut-off valve and control valve, that is to say, the negative pressure steam that the flash tank produced can directly let in the steam turbine and the whole journey of circulation of negative pressure steam does not have the sheltering from, so do benefit to the promotion of steam turbine efficiency. In addition, the applicability of the model of the regulating valve is also wider based on the above functions, and the above effects can be achieved by a regulating valve with an extremely small diameter, for example.

It should be noted that, in the present embodiment, the multiple regulating valves adopt a control method of split-range control, that is, within the range of the exhaust pressure of the exhaust port 30, the multiple regulating valves are divided into a plurality of pressure intervals, and each pressure interval is independently regulated and controlled by a corresponding regulating valve, so that the opening degree of the regulating valve can be accurately controlled by the regulation and control method set in this way, and further, the torque of the rotor 4, that is, the output power of the steam turbine, can be accurately controlled. The number of the regulating valves and the specification of each regulating valve are determined according to actual conditions such as exhaust steam pressure, steam inlet quantity and the like. For example, two regulating valves DN50 and DN80 may be provided at the steam outlet 30, and the valve opening of the regulating valves is controlled by a DCS control device. When the steam inlet pressure is between 11KPa and 20KPa, the DCS control device controls the DN50 to adjust the opening degree of the valve, thereby adjusting the steam exhaust pressure of the steam exhaust port 30; when the steam inlet pressure is between 21KPa and 40KPa, the DCS control device controls the DN80 to adjust the opening degree of the valve, thereby adjusting the steam outlet pressure of the steam outlet 30. So, adjust admission pressure and then adjust steam turbine power through a plurality of governing valves that set up in steam extraction 30 position department as above, effectively reduced the pressure loss of admission, and adjust the flexibility ratio higher.

In addition, when the pressure value of the steam introduced into the steam turbine is greater than the atmospheric pressure, in order to ensure the working effect of the steam turbine, the inlet cylinder 2 and the exhaust cylinder 3 are both manufactured by a casting process, and in order to ensure the strength of the cylinders, the wall thicknesses of the inlet cylinder 2 and the exhaust cylinder 3 are set to be large. However, in the present embodiment, since the steam is negative pressure steam, the pressure difference between the inner and outer walls of the intake cylinder 2 and the exhaust cylinder 3 is small, that is, it is not necessary to set the wall thickness of both of them to be excessively large. Therefore, in this embodiment, the air inlet cylinder 2 and the air exhaust cylinder 3 are both set to be of an integrated structure formed by welding, so that the production and manufacturing cost of an enterprise can be saved while the negative pressure steam heat can be fully converted, and the environmental protection requirement of the oil refining device for waste heat utilization is met.

In the present embodiment, as shown in fig. 1 to 2, the working assembly is provided in the space where the intake cylinder 2 and the exhaust cylinder 3 communicate with each other, that is, in the main body 1. In particular, the work assembly comprises a rotor 4 arranged horizontally in the centre of the exhaust channel, i.e. the axis of the rotor 4 coincides with the axis of the exhaust cylinder 3. Thus, the rotor 4 and the exhaust cylinder 3 are arranged concentrically, so that the negative pressure steam can be uniformly distributed outside the rotor 4, and the conversion efficiency of energy in the negative pressure steam is further ensured. The front end of the rotor 4, i.e. the end close to the intake cylinder 2, protrudes from the vertical part of the intake cylinder 2 and is fixed by a front bearing 60; the rear end of the rotor 4 extends to the inside of the exhaust cylinder 3 and is fixed to the inner wall of the exhaust cylinder 3 by a rear bearing 61. So set up, can guarantee that negative pressure steam all can with rotor 4 full action in the inside circulation of steam turbine, and then guarantee the conversion of energy in the negative pressure steam.

It should be noted that, as shown in fig. 2, the outer wall of the rear bearing 61 is uniformly provided with a plurality of supporting columns 9, that is, both ends of each supporting column 9 are respectively connected with the outer wall of the rear bearing 61 and the inner wall of the exhaust cylinder 3, so that the rear bearing 61 can be stably installed in the center of the exhaust cylinder 3. It should be further noted that the supporting columns 9 may be arranged at equal intervals, or may be staggered, that is, the above-mentioned uniform arrangement means that the force bearing points of the rear bearing 61 are uniformly distributed, so as to provide a stable supporting force for the acting assembly. In addition, the size, number, and the like of the support columns 9 are not particularly limited as long as smooth operation of the steam turbine can be ensured.

Further, the front bearing 60 is provided as a radial thrust integrated bearing, so that the front bearing 60 can simultaneously bear the thrust generated by the steam in addition to the function of supporting the rotor 4, thereby preventing the rotor 4 from axially shifting during the revolution. Further, the connection manner of the front bearing 60 and the rear bearing 61 to the main body 1 is not particularly limited, and both may be fixed to the main body 1 by a bearing housing 62, for example. In addition, the rotor 4 is a monobloc forged rotor 4, which has a compact structure and high strength and rigidity, thereby avoiding the problem of loosening of the blade assembly at high temperatures as described below.

In addition, as shown in fig. 1 to 2, since the steam in this embodiment is negative pressure steam, in order to ensure the sealing performance of the intake cylinder 2 and the exhaust cylinder 3 to prevent the inflow of the external air, a sealing portion is further provided on the rotor 4, and the sealing portion includes a front gland 50 and a rear gland 51 which are sleeved on the rotor 4. Specifically, the front gland seal 50 is provided at a position where the rotor 4 is connected to the intake cylinder 2, and the rear gland seal 51 is provided at an end of the exhaust cylinder 3 communicating with the intake cylinder 2, so that stability of the pressure of the steam inside the intake cylinder 2 and the exhaust cylinder 3 can be secured.

In the present embodiment, as shown in fig. 1, a vane carrier ring 80 is further provided in the intake cylinder 2, and the vane carrier ring 80 and a plurality of stages of vane groups each including a plurality of moving blades 81 distributed in the circumferential direction of the rotor 4 and a plurality of stationary blades 82 provided on the vane carrier ring 80 are provided. The negative pressure steam expands in the stationary blades 82, so that the temperature and pressure of the negative pressure steam are reduced, and further the flow velocity of the negative pressure steam is increased, that is, the heat energy in the negative pressure steam is converted into the kinetic energy of the airflow, and then the high-speed airflow formed by the negative pressure steam changes the velocity and the movement direction in the moving blades 81, so that the kinetic energy of the airflow is converted into the mechanical energy of the rotor 4, thereby converting the heat energy of the negative pressure steam into the mechanical energy. It should be noted that, the specific shape, size, etc. of each blade in the blade group are not particularly limited as long as the blade has good aerodynamic performance and strong tensile and bending resistance during rotation, so as to meet the above-mentioned action requirement. In addition, the number of stages of the blade group is not particularly limited, and it is determined according to actual conditions such as the pressure of the negative pressure steam or the rotational speed of the turbine.

In addition, as shown in fig. 1, the turning gear 7 is connected to the portion of the front end of the rotor 4 extending out of the air inlet cylinder 2 in the embodiment, and is disposed on the bearing seat 62 and further connected to the main body 1, by which the turning gear 4 can be turned before the steam turbine is started or after the steam turbine is stopped, even if the rotor 4 can continuously rotate at a low rotation speed for a certain time before the steam turbine is started or after the steam turbine is stopped, so as to determine whether friction exists between the moving part and the static part of the steam turbine, and determine whether the lubrication system works normally, thereby ensuring the safety of the steam turbine. In addition, the turning gear 7 can prevent the rotor 4 from being thermally bent and deformed due to uneven heat reception.

According to the negative pressure steam inlet condensing steam turbine based on the flash evaporation technology, the steam exhaust channel and the condenser are horizontally and axially arranged, so that the energy loss caused by flowing of negative pressure steam is reduced, and the residual speed utilization rate of the exhaust steam is improved. In addition, by arranging the cylinder inlet 2 and the cylinder outlet 3 to be welded into a one-piece structure, the manufacturing cost and the manufacturing period of an enterprise are saved.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still make modifications or changes to the embodiments described in the foregoing embodiments, or make equivalent substitutions for some features, within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A negative pressure admission condensing steam turbine based on flash evaporation technology is characterized by comprising the following components:

the steam inlet cylinder is provided with a steam inlet to introduce negative pressure steam;

the exhaust cylinder is communicated with the air inlet cylinder to form a communication end, an exhaust port is formed on the exhaust cylinder and used for being connected with a condenser, and the exhaust port of the exhaust cylinder is communicated with the air inlet port of the condenser through a horizontally arranged connecting pipe; and

and the working assembly is arranged in a space communicated with the cylinder inlet and the cylinder outlet.

2. The negative pressure steam admission condensing turbine based on flash evaporation technology of claim 1, characterized in that the steam inlet of the steam admission cylinder forms a steam admission passage towards the communicating end; the communicating end faces to a steam exhaust port of the steam exhaust cylinder to form a steam exhaust channel, and the steam exhaust channel is horizontally arranged.

3. The negative pressure steam inlet condensing turbine based on the flash evaporation technology as claimed in claim 2, wherein a steam inlet of the steam inlet cylinder is connected with a steam inlet flange, and the center of the steam inlet flange is coincident with the center of the steam inlet; the steam exhaust port of the steam exhaust cylinder is connected with a steam exhaust flange, and the center of the steam exhaust flange is superposed with the center of the steam exhaust port.

4. The negative pressure steam admission condensing turbine based on flash evaporation technology of claim 1, wherein the admission cylinder and the exhaust cylinder are both welded to form an integral structure.

5. The negative pressure steam admission condensing turbine based on flash evaporation technology of claim 1, wherein a plurality of regulating valves are connected to the steam discharge port, each regulating valve being independently controllable.

6. The negative pressure steam admission condensing turbine based on flash vaporization technology of claim 1 wherein the work assembly includes a rotor formed with a drive end protruding out of the steam admission cylinder, the drive end being provided with a front bearing; one end of the rotor close to the exhaust cylinder is provided with a rear bearing; the front bearing is a radial thrust integrated bearing.

7. The negative pressure steam admission condensing turbine based on flash evaporation technology of claim 6, wherein the rotor is provided with seals comprising a front gland seal and a rear gland seal; the front steam seal is positioned at the position where the rotor is connected with the air inlet cylinder, and the rear steam seal is positioned at the communication end.

8. The negative pressure steam admission condensing turbine based on flash evaporation technology of claim 7, wherein a vane carrier ring and a vane set are further disposed in the admission cylinder, and the vane set comprises a plurality of stationary vanes connected to the vane carrier ring and a plurality of moving vanes distributed along a circumferential direction of the rotor.

9. A flash vaporization technology based suction steam condensing turbine according to claim 6 wherein said rotor is a monobloc rotor.

10. The negative pressure steam admission condensing turbine based on flash evaporation technology of claim 6, characterized in that the drive end of the rotor is connected with a turning gear.

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