CN201982145U

CN201982145U - Shaft seal system of extraction condensing or condensing turbine

Info

Publication number: CN201982145U
Application number: CN201120092570XU
Authority: CN
Inventors: 陆象波; 钟挺; 丁亚洲
Original assignee: China Petrochemical Corp
Current assignee: China Petrochemical Corp
Priority date: 2011-04-01
Filing date: 2011-04-01
Publication date: 2011-09-21
Anticipated expiration: 2021-04-01

Abstract

The utility model discloses a shaft seal system of an extraction condensing or condensing turbine. The shaft seal system comprises a turbine (1), a pressure balancing box (3), a lower pressure heater (2) and a condenser (5), and is characterized in that a last but one shaft seal steam leakage pipe at a steam inlet end of the turbine (1) is connected to a primary negative pressure lower pressure heater (2) and the pressure balancing box (3). The shaft seal system solves the problem that the vacuum turbine suddenly descends during the adjusting process; steam leakage amount at the steam inlet end is obviously reduced; water amount in lubricating oil is obviously reduced; the problem that the temperature of a thrust pad of a high-pressure steam extraction unit is high is solved; the turbine vacuum ascends 1 to 2 KPa, so that the efficiency of the turbine is improved; and the shaft seal system can be extensively applied to various extraction condensing or condensing turbines.

Description

Sucking condensing type or pure condensate formula steam turbine gland system

Technical field

The utility model relates to a kind of sucking condensing type or pure condensate formula steam turbine gland system of being used for.

Background technique

Sucking condensing type or pure condensate formula steam turbine admission end unavoidably have part vapour and leak outside, the general branch of its vapour that leaks outside enters difference respectively for several grades and is recycled with vapour point, to improve thermodynamic system efficiency, this system is that front end leaks the vapour system, on the other hand, its exhaust steam end is a vacuum state, must consume a certain amount of steam, in order to the sealing exhaust steam end, guarantee the normal vacuum of steam turbine.In order to improve unit thermodynamic system efficient, sucking condensing type or pure condensate formula steam turbine admission end leak the vapour system and generally are associated with the exhaust steam end sealing system, and the front end leakage vapour system layout that is associated with the exhaust steam end sealing system forms a sleeve and seals system.This gland seal system is arranged multifarious, has serial problem for a long time, the vacuum Security of unit is constituted a threat to: cause the unit vacuum to descend suddenly; Vacuum is on the low side for a long time, and unit efficiency descends; The water of condensation dissolved oxygen increases, and can cause the low-voltage equipment oxygen corrosion; The surge tank consumption of steam is excessive; The unit admission end steam flow that leaks outside is big, waste heat energy, and cause and be with water in the set lubricant oil that the thrust bearing shoe valve temperature raises, and influences unit safety operation.

Summary of the invention

The utility model purpose is to provide a kind of leak outside gland seal system that is adapted to sucking condensing type or pure condensate formula steam turbine of steam of vacuum and minimizing that guarantees.

The technical solution adopted in the utility model is: a kind of sucking condensing type or pure condensate formula steam turbine gland system, comprise steam turbine, surge tank, low-pressure heater, vapour condenser, it is characterized in that: the shelves gland packing leakage pipe second from the bottom of the admission end of described steam turbine is connected to low-pressure heater and the surge tank that the first order is negative pressure respectively.

On the connecting tube of gland packing leakage pipe and low-pressure heater, install the valve of can regulate aperture additional.

Formula pressure gauge on the spot is installed before the described valve.

The utility model has solved steam turbine in the load adjustment process, the vacuum problem that descends suddenly; The admission end Steam loss obviously reduces; Water amount obviously reduces in the lubricant oil; Solved the high problem of high pressure extraction unit thrust bearing shoe valve temperature; Steam turbine vacuum rising 1～2KPa, thus turbine efficiency improved, and can be widely used in all kinds of sucking condensing turbines and pure condensate formula steam turbine.

Description of drawings

Fig. 1 is a structural drawing of the present utility model,

Among the figure, the 1st, steam turbine; The 2nd, low-pressure heater; The 3rd, surge tank; The 4th, formula pressure gauge on the spot; The 5th, vapour condenser.

Embodiment

The utility model is described in further detail with embodiment with reference to the accompanying drawings below:

As can be seen from Figure 1, the utility model comprises steam turbine 1, surge tank 3, low-pressure heater 2, vapour condenser 5, shelves gland packing leakage pipe second from the bottom at the admission end of steam turbine 1 divides one road pipeline to be connected to the low-pressure heater 2 that the first order is negative pressure with the threeway Placement before the valve of surge tank 3, the big I of its connecting line designs according to the size of unit, for DN50 between the DN125; On the connecting tube of gland packing leakage pipe and low-pressure heater, install the valve of can regulate aperture additional, formula pressure gauge 4 on the spot is installed before valve simultaneously.Wherein valve selection is mainly according to its caliber size, and pressure rating is 0.16MPa or 0.25MPa, and the valve mounting point is principle with the easy-to-operat, formula pressure gauge such as spring pressure gauge on the spot, and range is 0≤P≤1KPa.

In the steam turbine operation process of the present utility model, the valve opening on the connecting tube of adjustment gland packing leakage pipe and low-pressure heater guarantees pressure gauge indication control range: pressure gauge index (P) 〉=surge tank pressure, but as far as possible a little more than surge tank pressure.Valve opening is excessive, when making pressure index P be lower than 0MPa, may cause that the steam turbine set vacuum descends; When P was lower than surge tank pressure, the surge tank consumption of steam obviously increased, and had increased the unit energy consumption; P is higher than surge tank pressure more for a long time, can cause that steam turbine front end Steam loss increases, and causes that the unit specific steam consumption rises, and the thrust bearing shoe valve temperature raises, and lubricated oil mixed with water increases.

Claims

1. sucking condensing type or pure condensate formula steam turbine gland system, comprise steam turbine (1), surge tank (3), low-pressure heater (2), vapour condenser (5), it is characterized in that: the shelves gland packing leakage pipe second from the bottom of the admission end of described steam turbine (1) is connected to low-pressure heater (2) and the surge tank (3) that the first order is negative pressure respectively.

2. according to described sucking condensing type of claim 1 or pure condensate formula steam turbine gland system, it is characterized in that: the valve that on the connecting tube of gland packing leakage pipe and low-pressure heater, installs the can regulate aperture additional.

3. according to described sucking condensing type of claim 2 or pure condensate formula steam turbine gland system, it is characterized in that: formula pressure gauge (4) on the spot is installed before the described valve.