WO2012122762A1

WO2012122762A1 - Turbine vacuum steam heating and pressurizing reuse system

Info

Publication number: WO2012122762A1
Application number: PCT/CN2011/076836
Authority: WO
Inventors: 李树生
Original assignee: Li Shusheng
Priority date: 2011-03-16
Filing date: 2011-07-04
Publication date: 2012-09-20
Also published as: CN202073608U

Abstract

A turbine vacuum steam heating and pressurizing reuse system comprising a condenser (2), a recycling canister (1), a first-level jet pump (5), and a second-level jet pump (6). A jet pipe (8) and a reuse water pipe (7) are arranged on the recycling canister (1), wherein the jet pipe (8) has arranged thereon a high-pressure drainage pump (9, and 9'), and the reuse water pipe (7) has arranged thereon a reuse drainage pump. Jet inlets of the first-level jet pump (5) and of the second-level jet pump (6) are connected via a pipe to a water outlet pipe and/or a jet pipe (8) of the condenser. A suction inlet of the first-level jet pump (5) is connected to a steam discharge pipe of the condenser (2). The suction inlet of the second-level pump (6) is connected to an outlet of the first-level pump (5). An outlet of the second-level pump is connected to an inlet of the recycling canister (1). The reuse water pipe (7) is connected to a water-inlet of a deaerator (16). The apparatus allows the vacuum steam and the condensation water formed after cooling by the condenser (2) to be pumped into the recycling canister (1) via the jet pump, then, after being heated, to be sent into the deaerator for reuse, thus allowing recycling and reuse of the water resource and heat in the vacuum steam.

Description

Steam turbine vacuum stripping temperature lifting and reusing system

The invention relates to a steam turbine vacuum recovery system for recycling and recycling vacuum steam discharged from a steam turbine.

Background technique

Referring to Fig. 1, the prior art steam turbine vacuum recovery system mainly uses a steam-water circulation system composed of a vacuum such as a steam turbine 1, a condenser 2, a deaerator 6 and a cooling tower 3 to realize water vapor in the steam. Recycling and waste heat discharge. Although this type of steam turbine vacuum recovery system can recover part of vacuum steam for reuse, a large part of vacuum steam is directly or indirectly discharged into the atmosphere, which wastes a lot of heat energy. The thermal pollution of the environment. Although the vacuum steam generated by the vacuum steam plant is recovered in some systems, since the vacuum steam pressure is low, it is not easy to flow in the pipe, so that the recovery rate of the vacuum steam is limited, and the working efficiency of the system is not high.

Summary of the invention

In order to overcome the above-mentioned drawbacks of the prior art, the object of the present invention is to provide a steam turbine vacuum stripping temperature lifting and reusing system, which can improve water resources and heat energy in vacuum steam without affecting the operation of the vacuum equipment. Recycled after warming.

The technical solution adopted by the present invention to achieve the above object is:

A steam turbine vacuum stripping temperature lifting and recycling system, comprising a condenser, further comprising a recovery tank, a first-stage jet pump and a secondary jet pump, wherein the recovery tank is provided with a jet pipeline and a return water pipeline, the jet pipeline and The water return pipe is connected to the water storage area of the recovery tank through the same drainage main pipe or each of the water storage areas of the recovery tank, and the high pressure drainage pump is arranged on the discharge pipe of the water storage area independently connected to the recovery tank. a return water pump is disposed on the water return pipe independently connected to the water storage area of the recovery tank, and the jet inlets of the primary jet pump and the secondary jet pump are connected to the outlet pipe of the condenser through a pipeline and/or a jet pipe, a suction inlet of the primary jet pump is connected to an exhaust pipe of the condenser, and a suction inlet of the secondary jet pump is connected to an outlet of the primary jet pump, the secondary jet pump The outlet is connected to the inlet of the recovery tank.

The primary jet pump is preferably a tubular jet pump, and the secondary jet pump is preferably a multi-stage jet pump. The recovery tank is a vertical recovery tank.

The secondary jet pump may be a vertical jet pump provided with two stages of pressurization, and may be provided with a first-stage jet tube and a second-stage jet tube, and the inlets of the first-stage jet tube and the second-stage jet tube constitute the second a jet inlet of a stage jet pump, the jet of the primary jet tube being used to pressurize a medium flow entering from a suction inlet of the secondary jet pump, the jet of the secondary jet tube being used for the first stage The pressurization of the medium flow after the jet tube is pressurized.

The number of the first-stage jet tubes and/or the number of the second-stage jet tubes may be one or more. When the number of the first-stage jet tubes is plural, the suction inlets of the second-stage jet pumps may be divided into In the case of multiple paths, each of the first-stage jet tubes is pressurized from a medium flow entering from a suction inlet of the corresponding two-stage jet pump corresponding thereto, and when the number of the two-stage flow tubes is plural, The outlets of the plurality of secondary jet tubes may be evenly distributed over a section of the medium passage of the pump body of the secondary jet pump.

The pump body of the secondary jet pump is preferably in a vertical tubular shape, and is provided with a plurality of suction pipes, the suction pipes can be rotationally symmetrically distributed, and the inlets of the suction pipes constitute the pumping of the secondary jet pump. a suction port, the suction pipe may extend through the side wall of the pump body into the pump body, and a portion of the pump body is provided with a downward bend, and a suction pipe located below the bend may be The pump body of the secondary jet pump has a straight tubular shape with the same axial direction, and the secondary jet tube can extend through the rear end surface of the pump body of the secondary jet pump to the pump body, and the outlet thereof can be located at the respective Above the outlet of the suction pipe and the outlet of the respective suction pipe is located in the injection region of its jet, the primary jet can penetrate the suction pipe outside the pump and extend along the suction pipe The direction extends all the way to the outlet section of the suction pipe, the outlet of which can be located on the inner side of the outlet of the suction pipe, the jet injection zone gradually expanding in the axial direction of the suction pipe to the entire section in the suction pipe .

Preferably, the main body portion of the pump body of the secondary jet pump has a vertical tubular shape, the rear portion is elbow-shaped, and the outer end of the elbow constitutes a suction inlet of the secondary jet pump, the first-stage jet tube An inner cavity of the secondary jet pump may be inserted from a rear portion of the secondary jet pump along an axis of the pump body of the secondary jet pump, and a first-stage jet disposed in the pump body of the secondary jet pump a tube extension, the first-stage jet tube extending portion preferably having a straight tubular shape, the secondary jet tube may penetrate from a side wall of the pump body of the secondary jet pump into a pump body of the secondary jet pump, which is located a portion of the pump body of the secondary jet pump is provided with a bend, preferably after being bent, in a straight tubular shape which is the same as the axial direction of the pump body of the secondary jet pump, and the outlet of the secondary jet tube is located at the Within the injection zone of the outlet of the primary jet tube.

The main body portion of the pump body of the primary jet pump is preferably tubular, the inlet of the tubular pump body constitutes a suction inlet of the primary jet pump, and the outlet constitutes an outlet of the primary jet pump, the primary jet pump The jet tube may be provided with a jet port or a jet tube located in the pump body, and the number of the jet port or the jet tube may be plural, distributed on the same cross section of the tubular pump body or a plurality of different cross tubes. In the section, and extending toward the axis of the pump body.

The first-stage jet pump jet pipe may pass through a sidewall of the pump body and be connected to a jet distribution tube located in the pump body, the jet distribution tube including an extension coaxial with the first-stage jet pump jet pipe. The extension section may or may not be provided with an intersecting tube, the extension section and the port of the cross tube are closed, and the extension section and the cross tube may be provided with a plurality of jet ports or jet tubes, and the jets may be provided. The mouth or jet tube is evenly distributed over the extension and the cross tube.

The recovery tank may further be provided with a safety valve and an exhaust valve, which are preferably respectively installed at the top of the recovery tank, the recovery tank being used for connecting the drainage main pipe or the respective A condensate outlet for independently connecting the water conduit of the recovery tank and a condensate outlet for the return water conduit is preferably disposed at the bottom of the recovery tank, and the number of the high pressure drain pumps is preferably two or more for one use. More than one.

The return water pipe can usually be provided with drainage control or cutting width, which can be connected to the water inlet of the deaerator of the boiler system, thereby realizing direct reuse of the condensed water and heat in the existing steam turbine power generation system.

The recovery tank may be provided with a sensing device for collecting its water level signal, the signal output end of the sensing device is connected to a control device, and the control signal output end of the control device is connected to the drainage control or cuts off the wide Control the line, thereby achieving control of the drain of the recovery tank and maintaining the working pressure in the recovery tank.

The number of the recovery tanks may be several, and the number of the primary jet pumps and the secondary jet pumps is the same as the number of the recovery tanks, and is correspondingly set.

The beneficial effects of the present invention compared to the prior art are:

1. The invention adopts two-stage jet pumps with different structures to cooperate with each other, solves the problem of vacuum vapority in the large-diameter pipe through the first-stage jet pump, and sends the vacuum steam and the condensed water to the recovery tank through the secondary jet pump. Therefore, the technical problem that it is difficult to improve the recovery efficiency of the vacuum steam under the large diameter is overcome by the prior art. Due to the characteristics of the fluid medium, the technical means used in the present invention are connected in series with the same plurality of jet pumps or Parallel, at the same flow rate and boost amplitude, can significantly reduce power consumption and simplify the overall composition of the system. According to the applicant's experiment, the two-stage jet pump matching method defined by the present invention is combined with a plurality of common jet pumps in series and parallel mode according to the enthalpy (two branches according to the flow rate, each according to the pressure increase range) Two jet pumps are connected in series on the branch road. When the flow rate and recovery efficiency are equal, the power consumption is reduced by about 2. The introduction of the pipeline-type first-stage jet pump effectively increases the flow velocity of the vacuum steam in the exhaust pipe of the condenser, that is, increases the supply of vacuum steam, and provides sufficient vacuum steam for the recovery tank to solve In the prior art, the vacuum steam in the conveying pipe (diameter lm ~ 2m) is difficult to recover due to the large diameter of the pipe and the low flow velocity caused by the low vacuum pressure, and the pressure of the secondary jet pump is also provided. The relatively high suctioned medium helps to increase the suction effect of the secondary jet pump; the jet distribution tube of the primary jet pump is arranged to form a balanced distribution of multiple jets in the pump body of the primary jet pump, throughout A negative pressure region is formed on the medium passage to drive the forward flow from the inlet end of the pump body, which overcomes the difficulty of solving the medium fluidity under the large diameter pipe due to the small medium flow rate and power consumption of the conventional common jet pump. Defects.

3. After the vacuum steam is pressurized by the first-stage jet pump, the pressure is increased, which is beneficial to the suction of the secondary jet pump. The multiple suction inlets of the secondary jet pump can be set more effectively from the first-stage jet pump. The pressurized medium is pressurized to allow the pumped medium to enter the recovery tank more smoothly.

4. Since the secondary jet pump is placed above the recovery tank with a vertical jet pump, the flow of the medium (water or steam + water mixture) in the secondary jet pump is vertically downward, and the potential energy of the water is fully utilized and combined. The kinetic energy of the medium flowing from top to bottom effectively increases the suction and suction effects of the secondary jet pump.

5. The vacuum steam in the condenser is sucked into the recovery tank by the primary jet pump and the secondary jet pump, and converted into high-temperature and high-pressure water that can be reused in the recovery tank, which not only effectively utilizes the turbine discharge The vacuum steam, and by increasing the suction effect of the jet pump after the condenser, can greatly increase the degree of vacuum in the condenser, thereby facilitating the reduction of the required requirements under the premise of ensuring the normal operation of the turbine. Condensation vacuum reduces the cooling requirements for subsequent cooling towers, greatly reduces the amount of water and heat discharged from the cooling tower, saves resources and energy, and avoids the use of jet pumps to recover vacuum steam generated by vacuum equipment. The power consumption is high, and the implementation is difficult.

6. Since the condensate in the condenser is directly or indirectly injected into the primary and secondary or secondary jet pumps as a jet medium to pump the vacuum vapor in the condenser, not only the consumption of the jet is saved. The power is also fully mixed with the vacuum medium sucked from the condenser and the jet medium in the jet pump and the recovery tank, so that the vacuum steam is quickly condensed, and the heat released by the vacuum condensation is used to recover the water in the tank. (or called jet medium) is heated to increase the temperature of the recovered water (normally, it can reach about 100 °C under normal pressure, and can usually reach 120 °C after being pressurized by high-pressure pump), effectively reducing the entry into multiple stages. The heat that the condensate of the heater or deaerator is heated to the saturation temperature to recover the water and heat energy in the vacuum steam The use of energy conservation and environmental protection has also brought direct economic benefits to enterprises. 7. Since the water in the recovery tank is condensed by the vacuum steam in the condenser, the salt content of the water is low. Since the overall recycling process is carried out in the closed system, the oxygen content of the water is low due to the recovery process. The heat is released during the steam-water phase transition, and the temperature of the water is high. Therefore, the condensed water recovered by the present invention can be better adapted to the boiler water requirement, and can be significantly reduced by feeding it to the deaerator for reuse. The cost of water treatment not only reduces the waste of heat and water resources, but also has obvious economic benefits.

DRAWINGS

1 is a schematic view of a prior art steam turbine vacuum recovery system;

2 is a schematic structural view of a steam turbine vacuum stripping and pressure-recovering system of the present invention;

Figure 3 is a schematic structural view of a primary jet pump of the present invention;

Figure 4 is a schematic structural view of a secondary jet pump of the present invention;

Figure 5 is a schematic view showing the structure of another secondary jet pump of the present invention.

detailed description

The present invention will be further described in detail with reference to the accompanying drawings.

Referring to FIG. 2, FIG. 3, FIG. 4 and FIG. 5, the present invention provides a steam turbine vacuum stripping temperature lifting and reusing system, comprising a condenser 2 and a deaerator 16, wherein the condenser is provided with an outlet pipe. 3 and the exhaust pipe 4, the steam vacuum stripping and pressure recovery system of the steam turbine further comprises a recovery tank 1, a first-stage jet pump 5 and a secondary jet pump 6, wherein the secondary jet pump is preferably provided with two-stage supercharging a vertical jet pump, axially vertically downward, above the recovery tank, the recovery tank being provided with a return water conduit 7 for draining and a jet conduit 8 for forming a jet, the jet conduit and back The water pipe is connected to the water outlet area of the recovery tank by the same drainage main pipe or the water discharge pipe of the recovery tank, and the water discharge pipe of the water storage area independently connected to the recovery tank is provided with high-pressure drain pumps 9 and 9' The return water pipe independently connected to the water discharge area of the recovery tank is provided with a reuse drain pump, and the jet inlets of the primary jet pump and the secondary jet pump are connected to the outlet pipe of the condenser through a pipeline and/or Or the jet conduit, the first-stage jet a suction inlet of the pump is connected to the exhaust pipe of the condenser for drawing vacuum steam in the condenser into the primary jet pump, and a suction inlet of the secondary jet pump is connected to the The outlet of the first-stage jet pump is used for mixing the first-stage jet pump with the jet medium, and the vacuum steam is sucked into the secondary jet pump to be sent to the recovery tank to realize the recovery of the thermal energy of the vacuum steam, and the outlet of the secondary jet pump Connecting the inlet of the recovery tank, the inlet of the recovery tank is preferably disposed in the back a top of the tank, such that the jet flows from the top to the bottom after entering the recovery tank, and the high-pressure pump 10 may be disposed on the outlet pipe connecting the primary jet pump and the secondary jet pump or the outlet pipe of the condenser. The pressure in the first-stage jet pump is preferably not less than 0.5 MPa to facilitate the suction of vacuum steam and the maintenance of vacuum. In order to better realize the operation of the system, a cut-off width may be set on the outlet pipe of the condenser to facilitate control of the direction of the medium in the pipeline.

The water return pipe is provided with a drainage control or cut-off width 1 3 and is connected to the water inlet of the deaerator, and the recovery tank is provided with a sensing device 14 for collecting the water level signal thereof, the sensing device The signal output end is connected to a control device 15, the control device operates according to a preset program or control parameter, and the control signal output end is connected to the drain control or cuts off the wide control line, so as to be based on the water level in the recovery tank The drainage is controlled so that the water level in the recovery tank is maintained within a certain range.

In order to increase the overall operating efficiency of the system, the secondary jet pump is preferably a multi-stage multi-tube jet pump to create sufficient pressure to ensure that the spent steam (steam-liquid mixture) is fed to the recovery tank and sufficient pressure is created in the recovery tank.

The secondary jet pump generally adopts two stages of pressurization, and is provided with a first-stage jet tube and a second-stage jet tube, and the inlets of the first-stage jet tube and the second-stage jet tube constitute an inlet of the second-stage jet pump, wherein one stage The jet of the jet tube is used for the pressurized delivery of the inlet pumped medium stream, and the jet of the secondary jet tube is used for the pressurized transport of the medium stream of the first stage jet tube boost output.

Preferably, the number of the first-stage jet tubes is plural, thereby dividing the inlet by the pumping medium flow into multiple paths, so as to reduce the suction flow rate of each of the first-stage jet tubes, so as to effectively increase the jet flow at a large flow rate. The pump head provides the possibility.

Preferably, the number of the two-stage jet tubes is plural, and the outlets thereof are evenly distributed on one section of the secondary jet pump to overcome the defect that the single jet tube can absorb less flow, ensuring a large flow occasion. Effective use under.

Figure 4 provides an embodiment of a secondary jet pump having a pump body in a vertical tubular shape with a plurality of suction tubes 61, said suction tubes being rotationally symmetrically distributed, each suction The inlet of the tube constitutes a suction inlet of the secondary jet pump, the inlet of each suction tube may be connected to the outlet of the primary jet pump or may be connected to a main suction tube, the primary suction tube being connected to the first stage An outlet of the jet pump, the suction pipe extends through the side wall of the pump body into the pump body, the portion of the pump body extending downwardly and downwardly, and the outlet section 62 is a straight pipe along the axial direction of the pump body, The number of suction pipes is usually plural and uniform along the circumference at the same height The distribution can also be one if the suction flow rate is small. The secondary jet pump is provided with a first-stage jet tube 63 and a secondary jet tube 64. The second-stage jet tube extends through the rear end surface of the pump body into the pump body, and an outlet thereof is located above the outlet of the suction tube. The primary jet tube penetrates the suction tube outside the pump and extends in the direction of the suction tube axis to the outlet section of the suction tube, the outlet of which is located within the outlet end of the suction tube. The pumped medium stream from the primary jet pump first enters the suction tube of the secondary jet pump, the primary jet tube ejects a primary jet within the suction tube, creating a negative pressure within the suction tube for suction The medium flows forward under the action of the negative pressure, and is mixed with the jet emitted from the first-stage jet tube, and the secondary jet tube forms a negative pressure (relatively) in the pump body, and drives the suction of the jet which is ejected by the first-stage jet tube. Forming a mixed medium flow, and the secondary jet tube forms a negative pressure zone in the pump body to drive the flow of the mixed medium in the suction pipe.

Figure 5 shows another embodiment of the secondary jet pump. In this embodiment, the main body portion of the pump body of the secondary jet pump has a vertical tubular shape, and the rear portion has a curved shape 65. The outer port of the elbow constitutes the suction inlet of the secondary jet pump, thereby facilitating the connection of the secondary jet pump to the relevant pipeline, and also ensuring that the suction inlet passage of the secondary jet pump is exactly the first-stage jet The negative pressure area behind the outlet of the tube to enhance the suction effect. The secondary jet pump is provided with a first-stage jet tube 63 and a second-stage jet tube 64. Preferably, the first-stage jet tube is worn from the rear of the secondary jet pump along the axis of the pump body of the secondary jet pump. The inner cavity of the secondary jet pump is provided with an extension in the pump body of the secondary jet pump, the first-stage jet tube extension is straight tubular, and the first-stage jet tube extension is preferably along the second The stage jet pump extends in the axial direction and at its end is its outlet (i.e., the primary jet medium outlet) from which the primary jet medium is ejected outwardly to form a tapered spray region in the interior of the pump body. Preferably, the first-stage jet medium outlet may be provided as a tapered port to optimize the jet flow direction, and the first-stage jet medium outlet direction should be directed toward the direction of the medium flow in the pump body of the secondary jet pump, and the secondary jet tube may be Providing a secondary jet tube extension extending into the pump body of the secondary jet pump, the secondary jet tube extension preferably being provided with a bend, and after bending, is provided with the pump body of the secondary jet pump a straight tubular shape having the same axial direction and a secondary jet medium outlet at the end, the secondary jet medium outlet being provided as a tapered opening for better formation of a desired jet, the secondary jet medium outlet The direction (the opening direction of the outlet of the secondary jet tube) is preferably directed toward the direction of the medium flow in the pump body of the secondary jet pump, the outlet of the secondary jet tube preferably being located in the injection region of the outlet of the primary jet tube, To increase the suction of the secondary jet.

The secondary jet pump is preferably a vertical jet pump, the jet and the mixed mixed medium flow from top to bottom, to obtain better suction effect by utilizing the potential energy of the medium, especially for industrial applications, due to lack of Steam and mixing The flow rate of the combined medium is large, so the height of the jet pump tends to be several meters or even higher, thereby significantly increasing the pressure head of the jet pump and greatly reducing power consumption.

The number of the secondary jet tubes of the secondary jet pump may be one or several. When the number of the secondary jet tubes is several, the plurality of secondary jet tubes may be uniformly connected to the secondary On the same circumference of the radial direction of the jet pump, or the secondary jet tube is provided with a plurality of secondary jet tube branches, one end of the plurality of the second-stage jet tube branches is connected to the second-stage jet tube, and One end is evenly connected to the same circumference in the radial direction of the secondary jet pump, and the outlet of the secondary jet tube is evenly distributed on a section of the medium passage in the pump body of the secondary jet pump, The arrangement of several secondary jet tubes or secondary jet tube branches of the secondary jet pump can more effectively pressurize the pumped medium from the primary jet pump, so that the pumped medium can enter more smoothly. Recycling tanks.

The suction pipe of the secondary jet pump is arranged as a plurality of uniformly distributed pipes, and the large flow medium flow can be decomposed into a plurality of relatively small flow medium flows, and the first-stage jet pipe is respectively sucked in each suction pipe. The supercharging method solves the defect that the ordinary jet pump has a small suction flow rate and cannot pressurize the large flow medium, effectively realizes the supercharging of the large flow medium flow, and simultaneously pressurizes the secondary flow tube in the pump body. The function of forming a stable and reliable pressurized medium flow is beneficial to improving the state of the medium flow in the pump body and the recovery tank of the secondary jet pump, and ensuring that the medium flow smoothly enters the recovery tank.

Referring to FIG. 3, in order to improve the medium flow state of the overall system and the overall conveying capacity of the two-stage jet pump combination, the primary jet pump is preferably a tubular jet pump, the main body portion of which is tubular, and the inlet of the tubular pump body Forming a suction inlet 51 of the primary jet pump, the outlet forming an outlet 52 of the primary jet pump, the primary jet pump jet conduit extending through the side wall of the pump body, extending into the pump body, and the jet distribution in the pump body a tube connection, the jet distribution tube comprising an extension 53 coaxial with the first-stage jet pump jet conduit, the extension being located on a cross section of the pump body, extending in a radial direction of the pump body, the end portion Closed or sealedly connected to the inner wall of the pump body, the extension section is provided with a plurality of jet ports or jet tubes 54, and the extension section may be provided with one or more cross tubes 55 communicating with the The cross tube is also provided with a plurality of jet ports or jet tubes, which form part of the jet distribution tube. The jet ports and the jet tubes should generally extend toward the axis of the pump body to reduce the resistance and improve the suction effect. Preferably, the jet ports or the jet tubes are evenly distributed.

The inner diameter ratio of the jet tube to the extension or cross tube may generally be no more than 1:5, preferably no more than 1:10, such as 1:10, 1:12, 1:15, 1:18, 1:20 Or 1:30 to the extension and cross The pressure is uniformly equalized in the tube to ensure that the pressure of each jet tube and the outlet flow rate are substantially balanced, and that the jet has a sufficiently high flow rate, thereby improving the suction force and the suction effect on the suctioned medium, and improving the condenser The flow state of the medium in the exhaust pipe reduces turbulence and power consumption. The jet medium outlet may be provided as a tapered outlet for better jet formation.

The diameter of the jet distribution tube is preferably greater than 1 or more times the diameter of the injection port (the jet medium outlet or the injection port on the injection tube), whereby the medium flow rate in the jet distribution tube can be effectively reduced Maintaining or restoring the static pressure of the medium, which is beneficial to maintain the pressure, flow rate and flow balance of each injection port, and is beneficial to the stability of the medium flow inside the jet distribution tube, reducing turbulence and resistance, and helping to reduce cavitation. , prolong the service life of the jet distribution tube.

Through the arrangement of the plurality of jet ports, a plurality of evenly distributed jets are formed in the pump body of the primary jet pump, and a negative pressure region is formed on the entire medium passage to drive the forward steam from the inlet end of the pump body to flow forward. The pipeline type jet pump is especially suitable for driving a large flow medium flow in a large diameter pipe, and overcomes the problem that the conventional common jet pump is difficult to solve under large diameter pipe due to small medium flow rate and power consumption. Defects in media fluidity.

In general, the vacuum steam is difficult to press, and in the steam turbine system, the diameter of the vacuum steam exhaust pipe is about lm ~ 2m, because the vacuum steam pressure transmitted by it is too small to transmit, the first-stage jet pump The setting effectively improves the flow speed of the vacuum steam in the exhaust pipe, and solves the technical problem that the vacuum steam is difficult to recover due to the large diameter of the pipe and the low vacuum pressure in the conveying pipe, and can also be the secondary jet. The pump provides a relatively high pressure pumped medium that helps to increase the suction of the secondary jet pump. Generally, the vacuum steam temperature in the exhaust pipe of the condenser is about 30 ° C ~ 50 ° C, and the temperature of the mixed medium in the suction pipe can generally rise after being sucked by the first-stage jet pump. The temperature and pressure of the vacuum steam are increased from 40 °C to 70 °C.

The recovery tank is preferably a vertical recovery tank having a vertical dimension greater than its lateral dimension. Usually, the vertical recovery tank has a circular cross section and its height is preferably greater than one or more times the diameter of the cross section. The recovery tank is in a closed state, and the internal gas phase pressure can be generally about one standard atmospheric pressure, so as to facilitate the transportation of the secondary jet pump to the medium in the recovery tank and the condensation of the vacuum vapor in the recovery tank, and the internal condensed water temperature is 100. Around °C, thereby avoiding excessive power consumption, forming high-temperature condensate suitable for the boiler deaerator, and directly returning to the deaerator of the steam turbine power generation system. Since these condensed water comes from the steam output from the boiler, and the recovery process is completely closed, it can avoid the infiltration of oxygen and acid gases in the outside air, and is suitable for oxygen removal. The water requirements of the device help to reduce the cost of oxygen removal. The selection of the vertical recovery tank can increase the pressure of the drainage by the height of the tank itself or the height of the condensed water surface of the tank body, so as to reduce the power consumption of the drainage. The scale is particularly obvious.

According to different actual working conditions, such as the vacuum steam discharge amount of the vacuum steam device, the number of the recovery tanks may be set to several, and the number of the first-stage jet pump and the secondary jet pump is the same as the number of the recovery tanks. And - corresponding to the setting, 并联 use the parallel way to jointly recycle and reuse the water and heat energy of the vacuum steam. The return water pipes of the plurality of recovery tanks may be respectively connected to the condensed water recovery source, or may be connected to the same main return water pipeline, and the main drainage pipeline is connected to the condensed water recovery source, and when the setting is used, Each of the pipes connected to the primary jet pump and/or the secondary jet pump may be provided with the same number of branch pipes as the recovery canister and connected to a corresponding jet pump.

In order to achieve automatic, safe, efficient and continuous operation of the system, the recovery tank may be provided with a safety fence 11 and an exhaust valve 12, which may be respectively installed on the top of the recovery tank, The exhaust valve can periodically discharge non-condensable gas that cannot form condensed water, so as to avoid occupying excessive space of the recovery tank, and the safety can be automatically relieved after the pressure in the recovery tank exceeds a certain limit. To ensure the stability of the pressure in the recovery tank and the safe operation of the system. The outlet of the recovery tank is preferably disposed at the bottom of the recovery tank, thereby ensuring that condensed water is discharged from the outlet of the recovery tank, and the temperature of the condensed water pressurized by the return water pipeline can reach 80 ° C ~ 120 ° C, more favorable for secondary use, the number of high-pressure drainage pumps can be two for one or two, or more than two for a multi-purpose.

Each of the pipes involved in the present invention may be provided with a suitable wide door for convenient control, and a pressure gauge may be provided as needed to adjust according to the displayed pressure.

The diameter of each pipe involved in the present invention can be appropriately selected according to the size of the jet pump and the recovery tank and the engineering needs, and the pipes can be used with equal diameter pipes to facilitate the processing, or at least one of the unequal diameter pipes. To adapt to the flow rate and resistance requirements of different locations. The pipes and the pipes and the jet pump may be connected by welding, sequentially injection molding or other suitable manner, and the connection of any pipe body through the other pipe body or the pump body of the jet pump is Sealed connection.

The negative pressure of the present specification may be less than atmospheric pressure or greater than atmospheric pressure with respect to the original pressure of the pumped medium involved in the negative pressure.

Claims

Claim

1. A steam turbine vacuum stripping temperature lifting and recycling system, comprising a condenser, characterized in that it further comprises a recovery tank, a first-stage jet pump and a secondary jet pump, wherein the recovery tank is provided with a jet pipeline and a return water pipeline. The jet pipe and the return water pipe are respectively connected to the water storage area of the recovery tank through the same drainage main pipe or the water storage area of the water storage area independently connected to the recovery tank. a high-pressure drain pump, wherein the return water pipe of the water storage area independently connected to the recovery tank is provided with a reuse drain pump, and the jet inlets of the first-stage jet pump and the secondary jet pump are connected to the condenser through a pipeline An outlet pipe and/or the jet pipe, a suction inlet of the primary jet pump is connected to an exhaust pipe of the condenser, and a suction inlet of the secondary jet pump is connected to an outlet of the primary jet pump The outlet of the secondary jet pump is connected to the inlet of the recovery tank.

2. The steam turbine vacuum stripping temperature recovery system according to claim 1, wherein said first-stage jet pump is a duct-type jet pump, and said second-stage jet pump is a multi-stage jet pump, said recovery tank For vertical recycling tanks.

3. The steam turbine vacuum stripping pressure recovery system according to claim 2, wherein the secondary jet pump is a vertical jet pump provided with two stages of supercharging, and is provided with a first-stage jet tube and two. a jet tube, the inlets of the primary and secondary jets each forming a jet inlet of the secondary jet pump, the jet of the primary jet being used to enter from a suction inlet of the secondary jet pump The medium flow is pressurized, and the jet of the secondary jet is used to pressurize the medium flow after being pressurized by the primary jet.

4. The steam turbine vacuum stripping pressure recovery system according to claim 3, wherein the number of the primary jet tubes and/or the number of the secondary jet tubes is one or more, the first stage. When the number of the jet tubes is plural, the suction inlets of the secondary jet pumps are divided into multiple paths, and each of the first-stage jet tubes is entered from a suction inlet of the corresponding two-stage jet pump corresponding thereto. When the number of the secondary jet tubes is plural, the outlets of the plurality of secondary jet tubes are evenly distributed on a section of the medium passage in the pump body of the secondary jet pump.

5. The steam turbine vacuum stripping and pressure-recovering system of claim 3, wherein the pump body of the secondary jet pump is in a vertical tubular shape, and a plurality of suction pipes are provided. The suction pipe is rotationally symmetrically distributed, the inlet of each suction pipe constitutes a suction inlet of the secondary jet pump, and the suction pipe passes through the side of the pump body The wall extends into the pump body, the portion of the pump body is provided with a downward bend, and the suction pipe located below the bend is in the same straight tubular direction as the axial direction of the pump body of the secondary jet pump. The secondary jet tube extends through the rear end surface of the pump body of the secondary jet pump into the pump body, the outlet of which is located above the outlet of each suction tube and the outlet of each suction tube is located In the injection region of the jet, the first-stage jet tube penetrates the suction tube outside the pump body and extends along the extending direction of the suction tube to the outlet section of the suction tube, the outlet of which is located in the pumping section On the inner side of the outlet of the straw, its jet ejection region is gradually expanded in the axial direction of the suction tube to the entire cross section in the suction tube.

6. The steam turbine vacuum stripping pressure recovery system according to claim 3, wherein the main body portion of the pump body of the secondary jet pump has a vertical tubular shape and a rear portion having an elbow shape. An outer port of the elbow constitutes a suction inlet of the secondary jet pump, the primary jet pipe penetrating from the rear of the secondary jet pump to the second stage along an axis of the pump body of the secondary jet pump The inner cavity of the jet pump is provided with a first-stage jet tube extension section of the pump body of the secondary jet pump, the first-stage jet tube extending section is straight tubular, and the secondary jet tube is from the secondary jet pump a side wall of the pump body penetrates into the pump body of the secondary jet pump, and a portion thereof located in the pump body of the secondary jet pump is provided with a bend, and is bent to be a pump body of the secondary jet pump A straight tubular shape having the same axial direction, the outlet of the secondary jet tube being located in the injection region of the outlet of the primary jet tube.

7. The steam turbine vacuum stripping temperature recovery system according to claim 1, 1, 3, 4, 5 or 6, wherein the main body portion of the pump body of the primary jet pump is tubular, the tubular An inlet of the pump body constitutes a suction inlet of the primary jet pump, and an outlet constitutes an outlet of the primary jet pump, and a jet tube of the primary jet pump is provided with a jet port or a jet tube located in the pump body, the jet The number of ports or jet tubes is plural, distributed in the same cross section of the tubular pump body or in a plurality of different cross sections, and extends in the direction of the axis of the pump body.

8. The steam turbine vacuum stripping and pressure-recovering system of claim 7, wherein the jet stream of the first-stage jet pump passes through a side wall of the pump body and is connected to a jet distribution tube located in the pump body. The jet distribution tube includes an extension coaxial with the first-stage jet pump jet conduit, the extension section is provided with or without an intersecting tube communicating therewith, the extension section and the port of the cross-tube are closed, the extension section And the plurality of jet ports or jet tubes are disposed on the intersecting tube, and the jet ports or the jet tubes are evenly distributed on the extending portion and the intersecting tube.

9. The steam turbine vacuum stripping and pressure-recovering system of claim 8, wherein the recovery tank is further provided with a safety width and a venting width, and the safety width and the exhaust width are respectively installed in the a top portion of the recovery tank, the condensate outlet on the recovery tank for connecting the drain or the condensate outlet of the water returning region of the return tank, which is independently connected to the recovery tank, is disposed in the recovery tank At the bottom, the number of the high-pressure drain pumps is more than two for one or more spares.

10. The steam turbine vacuum stripping pressure recovery system according to claim 9, wherein the return water pipe is provided with a drainage control or a cut-off width, and is connected to a water inlet of the deaerator of the boiler system.

11. The steam turbine vacuum stripping temperature recovery system according to claim 10, wherein the recovery tank is provided with sensing means for collecting the water level signal, and the signal output end of the sensing device is connected. A control device, the control signal output of the control device is connected to the drain control or cuts off the wide control line.

12. The steam turbine vacuum stripping pressure recovery system according to claim 9, wherein the number of the recovery tanks is several, and the number of the primary jet pump and the secondary jet pump is the same as the recovery tank. The number is the same and corresponds to the setting.