Method and device for degassing of the condensate

 

(57) Abstract:

The invention relates to a power system. For the degassing of the condensate (K) gas and steam turbine installation (2) it is heated in the vessel feedwater (26), down to the heated condensate (K') and select the feed water (S) to be included in the water / steam circuit (3) steam turbine (2b) and heated flue gas (AG) from the gas turbine (2A) of the heating surfaces(6, 42, 52, 60). To provide simultaneous high efficiency of the installation due to the high energy use of waste heat from the gas turbine (2A) sufficient degassing of the condensate (K), according to the invention as a heat carrier (HZ) for heating the condensate (K) use a partial flow (t1heated condensate (') or a partial stream (t4heated feed water (S'). For this purpose, the device for implementing the method in the steam generator to the exhaust heat (1) after the condensate preheater (6) through capacity feedwater (26) includes a low pressure economizer (42), and the condensate preheater (6) or the low pressure economizer (42) has on the output side part of the capacity of the feed water (26) diverting the pipeline is Satan in the water / steam circuit of the gas and steam turbine installation. It relates also to a device for implementing the method.

In gas and steam turbine installation are contained in the exhaust gas from the gas turbine heat is used to produce steam for the steam turbine. When expanded in a steam turbine the steam is condensed in the water / steam circuit and resulting nutrient water evaporates in a streamlined hot exhaust gas from the gas turbine HRSG. To avoid corrosion in the water / steam circuit, usually dissolved in the condensate gas, particularly oxygen, are removed by thermal degassing. This is usually the possibility of degassing in the enabled after the steam turbine condenser capacity feed water, and flowing to the feed water at a temperature of from 8 to 15 K is easily supercooled condensate is heated coolant to the boiling point.

In known from the publication "Handbuch der Energie", volume 7, 1984, pages 100 - 107 method for heating and degassing collected in the vessel feedwater condensate and the coolant, use steam, which for this purpose additionally get in the evaporator low pressure in the HRSG. As shown in the European patent application 0515911, as templeboy cases, this heats the gas, however, to drive the steam turbine is lost so that the efficiency of the installation is limited.

From European application EP 0037845 hereinafter known combined gas and steam turbine, in which for feedwater heating separate, leading through the boiler loop heating. From JP-A-55/109708 known gas and steam turbine, in which the heating capacity of the feed water can enter preheated feed water. In these cases, however, there are significant technical preparation costs required for the degassing of the condensate systems.

The basis of the invention therefore have the task of specifying how the degassing of the condensate in the steam-water circuit gas and steam-turbine plant, in which the extremely high efficiency of the installation, due to the particularly high energy use waste heat from the gas turbine is particularly simple means to ensure sufficient degassing of the condensate. This should be achieved by simple means in a suitable for implementing the method the device.

On how this task according to the invention is solved for with isout partial stream is heated unmixed or partial condensate stream is heated feed water.

The invention thus proceeds from the consideration, with the exception of steam extraction from the steam-water circuit to receive the coolant to obezvozhivanija in capacity feed water, if possible, the temperature of the low pressure exhaust gases of a gas turbine, in order to achieve a particularly high use of heat of the exhaust gases and thereby a high efficiency boiler. To set the temperature of the feed water in the tank feed water when it is heated only a partial amount of condensate, which is then stirred into the cold condensate.

A partial stream can be sent directly to the capacity of the feed water. Preferably, however, a partial stream prior to its entry into the tank feed water to expand. It is reasonable, as obtained by the extension of the partial stream of pairs, and the resulting water to the tank feed water.

Setting the heating temperature of the condensate prior to its admission to the capacity of the feed water is preferably due to the fact that at least part of the heated condensate is routed in a circle, and cold is NCLI degassing takes on the function of the intermediate storage, moreover, its level for installation supplied to the steam flow feedwater control using fitted in the vessel feedwater condensate level. To achieve a particularly effective degassing of the condensate fluid is injected into the tank feed water below the level of the condensate. Released by heating of the condensate gases are then on the surface level of the condensate so that the flash steam released gas is in the tank feed water.

Of the device for implementing the method with steam in the waste heat in the steam-water circuit heater condensate, called the task according to the invention is solved due to the fact that after the condensate preheater through capacity feed water off the low pressure economizer, and air heater condensate is on the outlet side into the capacity of the feed water outlet pipe, and being parallel to the condensate preheater included included between the condenser and the capacity of the feed water bypass pipeline. Alternative low pressure economizer is on the outlet side into the capacity of the feed water outlet trooping water tank feed water can be produced in various ways. One possibility is that coming out of the condensate preheater and standing water under pressure or condensate through a suitable pipe system to allow the pipe is injected directly into the capacity of the feed water so that there to allow the pipe to the steam-water mixture is expanded.

In an alternative form of execution of the expansion occurs in the expansion tank included in the discharge pipe. This expansion tank is expediently connected on the steam side and water-side capacity of the feed water.

To set the temperature of the condensate in parallel with the condensate preheater included the return flow pipeline.

Examples of carrying out the invention are explained in more detail using the drawings:

Fig. 1 - cut the steam generator to the exhaust heat of the gas and steam turbine installation with a scheme for the degassing vessel feedwater,

Fig. 2 is different from the exemplary embodiment according to Fig.1 form complete with expansion tank in the pipeline condensate,

Fig. 3 - the following is different from the exemplary embodiment according to Fig.1 form complete with expansion tank in the pipeline feed water.

Sootwetstwu in Fig.1 cut the steam generator to the exhaust heat 1 is part of a gas and steam-turbine plant 2 for the production of electrical energy. He flowed around hot exhaust gas AG from the gas turbine 2a and is used to produce steam, and its heating surface included in the water vapor loop 3 steam turbine 2b.

For this purpose, the steam generator to the exhaust heat 1 contains connected through a condensate pipeline 4 to the capacitor 5, the condensate preheater 6, which is connected on the output side through the pipe reverse flow 8 with the circulation pump 10 and valve 12 from its entrance. To bypass if necessary the condensate preheater 6 parallel connected bypass pipe 14, valve 16. The condensate preheater 6 is also connected on the output side through the pipe 18, in which the valves 20 and 22, to the degasser 24, which is part of the capacity of the feed water 26. In the capacity of the feedwater 26 below the level of the condensate 28 flows into the jet pipe 30, through which the valve 32 in the pipe 34 is connected with the pipe 18 and thus with the release of the condensate preheater 6.

The capacity of the feedwater 26 is connected on the output side via the feedwater pipeline 36 with feedwater pump 38 and valve 40 with heater low pressure or low pressure economizer 42, the low-pressure 42 is connected through the valve 44 with drum low pressure 46, connected also located in the steam generator to the exhaust heat 1 as the heating surface of the evaporator low pressure 48. Low pressure drum 46 by steam through the pipe 50 is connected to the low pressure superheater 52, the heating surface which is also located in the steam generator to the exhaust heat 1.

The low pressure economizer 42 is connected also on the output side through the pipe 54 to the pump 56 and valve 58 with the following located in the steam generator to the exhaust heat 1 of the heating surface of the economizer 60. The heating surface of the economizer 60 is not represented in more detail by way connected with the output side with the other located in the steam generator to the exhaust heat 1 of the heating surfaces of the evaporator and superheater, which as well as the low-pressure superheater 52 includes the steam turbine 2b. This is indicated by the arrows 62 and 64. When the steam turbine 2b lead pairs at different levels of pressure, i.e. low pressure steam ND, steam medium-pressure MD and high-pressure steam HD.

In the operation of the steam generator to the exhaust heat 1 to the condensate preheater 6 through tropopause condensate 6 may be partially or fully bypassed through the bypass line 14. The condensate K in the condensate preheater 6 is heated by heat exchange with the flowing of the gas turbine 2a hot exhaust gas AG and besides, at least partially, is pumped by the circulation pump 10 in the pipe reverse flow of 8.

The heated condensate K' through the pipeline 18 is directed into the vessel feedwater 26. While there is heated heated condensate K' through directed through line 34 partial flow t1the heated condensate K'. Moreover, a partial stream t1through the valve 32 as a coolant HZ directly injected into the vessel feedwater 26, and it expands to allow the pipe 30. The flash steam released gases thus only occurs in the vessel feedwater 26.

The heated condensate K' pump feed water 38 fail as feed water S to the low pressure economizer 40, and there feedwater S further heated. A partial stream t2heated feed water S sent to the low pressure drum 46. It evaporates in the evaporator low pressure 48, and separated in the drum low pressure 46 steam is superheated in the superheater low pressure 52 and the PE the current t3heated feed water S' by means of pump 56 is brought to a high pressure level and then further heated in the economizer 60. This partial stream t3also evaporated not described in more detail way and high-pressure superheated steam HD down to part of the high pressure steam turbine 2b.

In the example of execution according to Fig.2 in the discharge pipe 34 is enabled expansion tank 70. As coolant HZ is used here in pairs, separated when extending a partial flow t1the heated condensate K' in the surge tank 70. Separated when extending a partial flow t1in the surge tank 70 water through the pipe 72 down to the vessel feedwater 26.

In the example of execution according to Fig.3 the low pressure economizer 40 on the output side is connected to the tank feed water 26 through with the valve 73 and a discharge pipe 74 through which is directed a partial stream t4heated feed water S'. As coolant HZ to heat the condensate K' in the vessel feedwater 26 is used here pairs, separated when extending a partial flow t4heated feed water S' in the expansion tank 70'. CLASS="ptx2">

Due to the use or partial flow t1the heated condensate K' or partial flow t4heated feed water S' as the coolant HZ to heat the condensate K' in the vessel feedwater 26 is particularly effective way is taken heat for coolant HZ of the low-temperature region of the steam generator to the exhaust heat 1, without the need for additional heating surface of the heater or evaporator and/or additional auxiliary units, such as pumps.

1. Method of degassing of the condensate (K) gas and steam turbine installation (2) by heating the condensate in the tank feed water (26), which fail heated condensate (K') and select the feed water (S) to be included in the water / steam circuit (3) steam turbine (2b) and heated flue gas (AG) from the gas turbine (2A) of the heating surfaces(6, 42, 48, 52, 60), moreover, the heated condensate (K') stirred into cold condensate (K) and as a heat carrier (HZ) for heating condensate using a partial flow (t1heated mixed condensate (') or a partial stream (t4heated feed water (S').

2. The method according to p. 1, wherein >/P>3. The method according to p. 2, characterized in that as obtained by expanding the partial flow (t1, t4) pairs, thus resulting water down to the capacity of the feed water (26).

4. The method according to any of paragraphs.1 to 3, characterized in that the carrier (HZ) injected into the vessel feedwater (26) below the level of the condensate (28).

5. The device for implementing the method according to any one of paragraphs.1 - 4 with steam in the waste heat (1) included in the steam-water circuit (3) condensate preheater (6) and included him after the capacity of the feed water (26) the low pressure economizer (42), and the condensate preheater (6) has on the output side part of the capacity of the feed water (26) and a discharge pipe (34), and to the condensate preheater (6) connected in parallel connected between the capacitor (5) and the capacity of the feed water (26) the bypass pipe (14).

6. The device for implementing the method according to any one of paragraphs.1 - 4 with steam in the waste heat (1) included in the steam-water circuit (3) condensate preheater (6) and included him after the capacity of the feed water (26) the low pressure economizer (42), and the low pressure economizer (42) has Shirota (6) connected in parallel by-pass pipe (14).

7. The device under item 5 or 6, characterized in that the discharge pipe (34, 74) included the expansion tank (70, 70').

8. The device according to p. 7, characterized in that the expansion tank (70.70') is connected from the side of the water tank feed water (26).

9. Device according to any one of paragraphs.5 to 8, characterized in that parallel to the condensate preheater (6) included the return flow pipeline (8).

 

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