Design layout for turbine sets and condensing plant

FIELD: mechanical engineering.

SUBSTANCE: invention refers to the field of industry and ship power engineering, predominantly to transport and stationary steam-turbine plants. The design layout of turbine sets and exhausted steam condensing plant includes the main turbine, isolated generator turbines, transonic jet condensing plants of mixing type - condensate transonic jet pimps built in housings of devices for exhaust stem bleeding from turbine sets, and combined remote condensate collector.

EFFECT: invention makes possible, while keeping constant steam turbine power, to exclude conventional stem components of the main condenser with piping for turbine sets exhaust stem condensing from design layout, to lower weight of unit equipment, reduce its volume by (36÷50) % and to improve reliability of exhaust stem condensing system.

4 dwg

 

The invention relates to the field of industrial and naval power, mainly for transport and stationary steam turbine units (PTU).

The object of the invention is a layout diagram of turbine and mixing type transonic jet condensing the exhaust steam of the turbine condensate transonic jet pumps to significantly reduce the footprint of the design pattern of volumes with the same power of PTU.

Closest to the proposed layout of the scheme is achieved by compactness are layout diagrams of the turbine and condensing taken in the underwater nuclear shipbuilding Russia. A prototype of the invention taken layout of turbines and condensing installation of exhaust steam of the turbine gtsa - 615 [Kirichenko VA Album circuits to tutorial "Design elements of steam-turbine plants for submarines". - Sevastopol Sevastopol WMI, 1988, page 88]. A schematic layout diagram of the prototype is shown in figure 1 (view from right side) and figure 2 (view from the nose) on the basis of drawings of longitudinal sections and cross-sections (p.5 fig.1.2; page 8 figure 1.4; p.13 RES; p.62 RES; p.64 RIS and p.72 RIS).

The prototype layout schemes turbine units, conden shall include the installation of exhaust steam of the turbine consists of the main turbine (GT) 1, two independent turbine generator (APG) 2, 3, above the GT on both right and left, two blocks part of the main steam condenser (SC) 5, 11 and tube steam condensation systems, two of the extension of the condensate gathering tanks (VXB) 7, 10, two buildings feeder (PMC) 6, 12, spent a couple of GT and two PMC 4, 13, spent a couple APG 2, 3 housing the steam side of the Ledger 5, 11.

Occupied by the listed equipment prototype layout schemes the amount determined in relative proportion to the size of actual equipment steam turbine and is assumed equal to Vp=Lp×p×Hp=1, where

Vp=1 is the volume occupied by the unit equipment prototype;

Lp=1 - maximum block length hardware prototype defined by the housings of the main steam condenser (SC) pipe systems condensing steam;

Inp=1 - maximum width of unit equipment prototype defined forming enclosures steam parts Ledger;

Hp=1 - maximum height unit hardware prototype, designated buildings forming the APG and bottoms external condensational.

Condensate pumps (ECN) 8, 9 and pipelines to supply them condensate from VXB 7, 10 figure 1 shows less thick lines and volume layout schemes are not included.

Other equipment the Finance vocational schools (regulation of frequency of rotation of the turbine, condensate-feedwater and steam circuit with valves, feed pumps, etc.) figure 1 is a layout diagram of the prototype is not shown, as not related to the content of the described invention.

Disadvantages layout diagram of the prototype are:

1. Considerable weight and dimensions of the two buildings of the main steam condenser tube steam condensation systems.

2. The complexity of the structures of the seal tube system cooling water in the tube plate of the steam separation of parts and water chambers GK.

3. Lack of reliability of the material pipe systems in cases of admission of steam with temperatures higher than the calculated values and the sudden cessation of circulation of cooling water.

The objective of the proposed layout of the scheme is to eliminate the above disadvantages.

The technical results of the proposed layout scheme of turbine and condensing installation of exhaust steam of the turbine are:

- Reducing the weight and size of equipment layout schema.

- Simplification of the structure of the condensation installation.

- Improved reliability of the design condensing installation.

Technical results (positive effect) is achieved by the fact that:

- Excluded corps steam parts SC 5, 11 and tube steam condensation systems.

For condensing the exhaust steam of the turbine units are mixing type transonic jet condensing installation condensate transonic jet pumps 14, 15, 16 and 17 are embedded in the housing of the feeder exhaust steam turbine units at HK 4, 6, 12, and 13, and up to the present time in the steam turbine installations not used.

- Mixing type transonic jet condensing installation - condensate transonic jet pumps 14, 15, 16 and 17 simultaneously with the condensation of the exhaust steam turbine units perform the functions of condensate pumps 8, 9 and serves condensate nutrient pumps (MO) and bypass the condensate.

Both remote kondensatornii 7, 10 United in one common condensate 18, which is located across the length and width of the layout schema.

Proposed as the object of the invention is a layout diagram of the turbine and condensing installation of exhaust steam of the turbine, consisting of a main turbine 1, two independent turbine generators 2, 3, four buildings feeder exhaust steam turbine units 4, 6, 12, 13 on the main capacitor, characterized in that it contains mixing type transonic jet condensing installation - condensate transonic jet pumps 14, 15, 16, 17, built into the case feeder exhaust steam from the turbine to the main condenser 4, 6, 12, 13, Autonomous turbine generators 2, 3 below GL is main turbine 1, the casing 6, 12 mixing type transonic jet condensing units condensate transonic jet pumps 15, 16 main turbine located under it vertically, and the United bypass the condensate 18 is placed along the entire length and width of the layout schemes, as shown in figure 3 (view from right side) and figure 4 (view from the nose).

In the proposed layout scheme, all mixing type transonic jet condensing installation - condensate transonic jet pumps (Chis) 14, 15, 16, 17, placed in packages of devices for supplying exhaust steam from the turbines 4, 6, 12, 13, work the same way. Consider the example of one of the Chis main turbine (the principle described in the book Fisenko CENTURIES Compressibility of the fluid and the efficiency of the circulation contours NPU. - M.: Energoatomizdat, 1987 and patents EN 2142581, 6 F04F 5/54, publ. 1999.12.10; EN 2133836 C1, 6 F01K 11/02, publ. 1999.07.27; EN 2294028 C2, G21D 5/06, publ. 2007.02.20 bull. No. 5).

Spent steam GT 1 with great speed comes in parallel spaced in a common annular housing Chis 16 sections. Directly at the entrance to each section is narrowing the nozzle or nozzles of the condensate from VXB 10 in the steam flow. Due to the kinetic energy of the jet of steam in a narrowing pipe bore of the mixing chamber up the Arata steam-water flow very quickly becomes homogeneous two-phase supersonic, characterized by extremely high efficiency of the processes of exchange of quantities of motion between vapor molecules and water droplets having a size in a fraction of a micron, a small local speed of sound in it and high compressibility. Due to the large velocity in the mixing chamber are low pressure and temperature. The decrease for the last stage of the turbine pressure and temperature below the ambient temperature increases creativesage GT 1 teleperedach and to the increase in the production of mechanical energy, i.e. increase the efficiency of the turbine unit.

In the area of the minimum flow area of the mixing chamber is formed racing transition uniform supersonic two-phase steam-water flow in the subsonic flow of a single phase environment - water. In a race vapor phase stream asianrape kropivieca, and by the movement of water in the expanding part of the flow area at the outlet of the apparatus is set to a pressure sufficient to supply part of the condensate to the suction of the feed pump and the return of the remaining part in Wcsb.

The evaluation showed that due to exceptionally high performance mixing type transonic jet condensing condensate transonic jet pumps to accommodate them enough amounts previously allocated for housing the housing supply of exhaust steam from the respective turbines to steam the parts of the main capacitor PTU. Traditional steam part of the main capacitor surface types with their tube steam condensation systems are excluded from vocational schools, which explains the possibility of reducing the dimensions of the piece of equipment using the proposed layout of the scheme.

Figure 3 (view from right side) and Fig.(view from the nose) shows a layout pattern that is different from the prototype in that the housing of the Autonomous turbine generators 2, 3 placed below the main turbine and moved slightly to the sides, the casing of the mixing type transonic jet condensing units condensate transonic jet pumps 15, 16 main turbine 1 is located under the turbine unit vertically, and the United bypass the condensate 18 is placed along the entire length and width of the layout scheme of the block.

This layout:

- The length of the unit equipment PTU is reduced to the value defined by the dimensions of GT 1, i.e. to the L1=Lp-(ΔL1+ΔL2)=0,64Lp.

- Height of unit equipment PTU is reduced to the value determined new location of the turbines of generators 2, 3, i.e. to H1=Np-ΔN=0,79 Np.

In total unit volume of equipment PTU is 0.5 volume prototype - V1=L1×p×H1=0,64Lp×p×0,79Hp=0,5Vp .

It should be noted that taking into account exceptions schema building block condensate pumps when required location below the extension of the condensate to ensure reliable suction of condensate under vacuum Wcsb would get even greater reduction in the volume of building block.

The technical result of the invention:

1. Depending on the relative position of the turbine, mixing type transonic jet installations condensing the exhaust steam of the turbine condensate transonic jet pumps and the extension of the condensate volume building block at a constant power steam turbine will not exceed 50% of the volume unit of the prototype.

2. The weight of the equipment unit will be reduced by excluding the mass of the buildings of the main steam condenser tube steam condensation systems.

3. Reliability design of mixing type transonic jet installations condensing the exhaust steam of the turbine condensate transonic jet pumps will increase due to the exclusion of structurally complex seals pipe systems cooling water in the tube plate of the steam parts and water chambers of the main capacitor and removing the problem of insufficient reliability of the material pipe systems in case the x admission of steam with a temperature higher than the calculated values and the sudden cessation of circulation of cooling water.

1. Layout of turbines and condensing installation of exhaust steam of the turbine, consisting of a main turbine, two Autonomous turbine generators, four buildings feeder exhaust steam turbine units on the main capacitor, characterized in that it contains mixing type transonic jet condensing installation - condensate transonic jet pump built into the housing of the feeder exhaust steam from the turbine to the main condenser, Autonomous turbine generators located below the main turbine, the casing of the mixing type transonic jet condensing units condensate transonic jet pumps main turbine located under it vertically, and the United bypass the condensate is placed along the entire length and width layout schemes.



 

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