1. The utility model provides a be applied to H level gas turbine steam-operated feedwater pump system, its characterized in that includes feed-water pump, little steam turbine, the feed-water pump passes through little steam turbine drive, little steam turbine import comes the steam with old factory through the pipeline and is connected.

2. The steam-driven water feed pump system applied to the H-grade gas turbine as claimed in claim 1, wherein the steam-driven water feed pump system applied to the H-grade gas turbine further comprises a first condenser and a first condensate pump, the outlet of the small steam turbine is connected with the first condenser through a pipeline, the first condenser is connected with the first condensate pump through a pipeline, and the outlet of the first condensate pump supplies condensate water to a condenser hot well of an old plant through a pipeline.

3. The steam-driven water feed pump system applied to the H-grade gas turbine as claimed in claim 1 or 2, wherein the steam-driven water feed pump system applied to the H-grade gas turbine further comprises a waste heat boiler and a steam turbine, an outlet of the water feed pump is connected with the waste heat boiler through a pipeline, and the waste heat boiler is connected with an inlet of the steam turbine through a pipeline.

4. The steam feed pump system applied to the H-class gas turbine is characterized by further comprising a generator, and the large turbine can drive the generator to generate electricity.

5. The steam-driven feed water pump system applied to the H-class combustion engine is characterized in that the large steam engine supplies heat to a heat user through intermediate extraction steam of a pipeline.

6. The steam-driven water feed pump system applied to the H-grade gas turbine as claimed in claim 3, wherein the steam-driven water feed pump system applied to the H-grade gas turbine further comprises a second condenser and a second condensate pump, the outlet of the large steam turbine is connected with the second condenser through a pipeline, the second condenser is connected with the second condensate pump through a pipeline, and the outlet of the second condensate pump is connected with the inlet of the feed pump through a pipeline.

7. The steam-driven water feed pump system applied to the H-grade gas turbine as claimed in claim 6, wherein the steam-driven water feed pump system applied to the H-grade gas turbine further comprises a deaerator, the outlet of the second condensate pump is connected with the inlet of the deaerator through a pipeline, and the deaerator is connected with the inlet of the water feed pump through a pipeline.

Background

The common water feeding pump has two driving modes of electric and steam, the electric water feeding pump consumes huge power which is about 50% of the total service power, so that the existing large-scale steam turbine set always operates the water feeding pump (steam driven pump) driven by the small steam turbine and uses the traditional electrically driven water feeding pump (electric pump) for standby. For example, after a certain domestic thermal power plant uses a pneumatic pump with the same power to replace an electric pump, the annual net income can reach 219 ten thousand yuan. At present, the steam source of the small steam turbine is widely used for extracting or exhausting steam (collectively called as a low-pressure steam source) of an intermediate pressure cylinder, when the load of a main steam turbine is 35% -40%, the extracted or exhausted steam can not meet the power required by a water feeding pump, the high-pressure steam source (such as auxiliary steam header steam, cold reheat steam or new steam) needs to be switched, and the reasonable steam source of the steam pump is arranged, so that the overall economy is favorably improved.

Disclosure of Invention

The invention aims to provide a steam-driven water supply pump system applied to an H-level gas turbine, which drives a small steam turbine in an H-level gas turbine power plant through steam from an old factory and further drives a water supply pump, so that redundant steam of the old factory is reasonably consumed, the configuration of the old factory is optimized, and the plant power consumption rate of the H-level gas turbine power plant is effectively reduced, thereby reducing the operation cost of the power plant.

The invention adopts the following technical scheme for realizing the aim of the invention:

the invention provides a steam-driven water feeding pump system applied to an H-level gas turbine, which comprises a water feeding pump and a small steam turbine, wherein the water feeding pump is driven by the small steam turbine, and an inlet of the small steam turbine is in steam connection with an old factory through a pipeline.

Further, be applied to H level gas turbine steam-operated feed water pump system still includes first condenser and first condensate pump, little steam turbine export through the pipeline with first condenser is connected, first condenser through the pipeline with first condensate pump is connected, first condensate pump export supplies the condensate water back to old factory's condenser hot-well through the pipeline.

Further, the steam-driven water feeding pump system applied to the H-level gas turbine further comprises a waste heat boiler and a large turbine, wherein an outlet of the water feeding pump is connected with the waste heat boiler through a pipeline, and the waste heat boiler is connected with an inlet of the large turbine through a pipeline.

Further, the steam-driven water-feeding pump system applied to the H-level gas turbine further comprises a generator, and the large turbine can drive the generator to generate electricity.

Further, the steam generator supplies heat to a heat user through steam extraction in the middle of the pipeline.

Further, be applied to H level gas turbine steam-operated feed water pump system still includes second condenser and second condensate pump, the big turbine export pass through the pipeline with the second condenser is connected, the second condenser pass through the pipeline with the second condensate pump is connected, the second condensate pump export pass through the pipeline with feed water pump access connection.

Further, be applied to H level gas turbine steam-operated feed water pump system still includes the oxygen-eliminating device, the second condensate pump export pass through the pipeline with the oxygen-eliminating device access connection, the oxygen-eliminating device pass through the pipeline with feed water pump access connection.

The invention has the beneficial effects that:

according to the invention, the steam from the old factory drives the small steam turbine in the H-level gas turbine power plant, and further drives the water feeding pump, so that redundant steam of the old factory is reasonably consumed, the configuration of the old factory is optimized, and the power consumption rate of the H-level gas turbine power plant is effectively reduced, thereby reducing the operation cost of the power plant;

because the big steam turbine does not need to extract steam to drive the small steam turbine, the output of the big steam turbine is improved, and both external heat supply and power generation can be increased, thereby improving the economic benefit of the H-grade gas turbine power plant.

Drawings

Fig. 1 is a schematic structural diagram of a steam feed pump system applied to an H-stage combustion engine according to an embodiment of the present invention.

Detailed Description

The technical scheme of the invention is further explained in detail by combining the attached drawings:

as shown in figure 1, the invention provides a steam-driven water-feeding pump system applied to an H-level gas turbine, which comprises 8 a water-feeding pump 1, a small steam turbine 2, a first condenser 9, a first condensate pump 10, a waste heat boiler 3, a large steam turbine 4, a generator 5, a second condenser 6, a second condensate pump 7 and a deaerator, wherein the water-feeding pump 1 is driven by the small steam turbine 2, the inlet of the small steam turbine 2 is connected with the steam coming from the old plant through a pipeline, the outlet of the small steam turbine is connected with the first condenser 9 through a pipeline, the first condenser 9 is connected with the first condensate pump 10 through a pipeline, the outlet of the first condensate pump 10 supplies the condensate water back to the old plant through a pipeline, the outlet of the water-feeding pump 1 is connected with the waste heat boiler 3 through a pipeline, the waste heat boiler 3 is connected with the inlet of the large steam turbine 4 through a pipeline, the large steam turbine 4 drives the generator 5 to generate electricity, the middle steam extracted from the large steam turbine 4 supplies heat users through a pipeline, the outlet of the steam turbine 4 is connected with the second condenser 6 through a pipeline, the second condenser 6 is connected with the second condensate pump 7 through a pipeline, the outlet of the second condensate pump 7 is connected with the deaerator 8 in an inlet through a pipeline, and the deaerator 8 is connected with the feed pump 1 in an inlet through a pipeline to form circulation.

In this example, the feed pump 1 is driven by a small turbine 2 instead of an electric motor;

in the embodiment, the steam source of the small steam turbine 2 is provided by steam from an old factory, but the large steam turbine 4 extracts or exhausts the steam;

in this example, the outlet of the small turbine 2 is connected with a first condenser 9 through a pipeline, the outlet of the first condenser is connected with a first condensate pump 10 through a pipeline, and the first condensate pump 10 supplies condensate water to a condenser hot well of an old plant through a pipeline, so that the steam-water balance of the old plant is realized;

in this example, the steam generator 4 can realize heat supply and power generation at the same time;

a steam-driven feed water pump 1 scheme applied to an H-level gas turbine is as follows:

steam from old factories is introduced into a small steam turbine 2 of an H-grade gas turbine power plant to drive a water feeding pump 1, feed water is heated into steam by a waste heat boiler 3 and enters a big steam turbine 4 to do work, on one hand, a generator 5 is driven to generate electricity, on the other hand, steam with proper parameters in the middle of the big steam turbine can be extracted to supply heat to the outside, and cogeneration is realized; steam which does work in the steam turbine 4 is condensed by the second condenser 6, condensed water enters the deaerator 8 through the condensed water pump 7, and returns to the water feeding pump 1 after being treated to form a loop; after the steam from the old factory does work in the small steam turbine 2, the steam is condensed by the first condenser 9, and the condensed water is supplied to the hot well of the condenser of the old factory through the first condensed water pump 10 to form a loop, so that the steam-water balance of the old factory is realized.

A steam-driven water-feeding pump scheme applied to an H-level gas turbine is characterized in that a small steam turbine in an H-level gas turbine power plant is driven by steam from an old plant, and the water-feeding pump is further driven, so that redundant steam of the old plant is reasonably consumed, the configuration of the old plant is optimized, and the plant power consumption rate of the H-level gas turbine power plant is effectively reduced, so that the operation cost of the power plant is reduced; on the other hand, because the large steam turbine does not need to extract steam to drive the small steam turbine, the output of the large steam turbine is improved, and both external heat supply and power generation can be increased, thereby improving the economic benefit of the H-level gas turbine power plant.

The feasibility of the steam feed pump scheme applied to the H-grade gas turbine is further explained by calculation, taking a certain million domestic units as an example, under the working condition of 100% load, the high-pressure feed pump is designed to have a flow Q_t486t/H, head H_p＝2135mH₂O, pump efficiency h₁83%, the pump shaft power W can be calculated_bz：

The small steam turbine is used for driving the high-pressure water feeding pump, and according to the mechanical transmission efficiency of 98 percent and the gearbox efficiency of 98 percent, the required output power W of the small steam turbine can be calculated to be 3543kW and the steam inlet enthalpy h of the small steam turbine₁3179kJ/kg, ideal enthalpy of small steam turbine exhaust h₂2239kJ/kg, small steam turbine internal efficiency h_i0.814, the inlet steam of small steam turbine needed by water pump can be obtainedAmount Q:

it can be seen that the requirement of the steam feed water pump can be met only by providing 16.7t/h of extraction steam (the steam source is provided by old factories in the invention).

While the preferred embodiments of the present invention have been illustrated and described, it will be appreciated that the invention may be embodied otherwise than as specifically described and that equivalent alterations and modifications, which may be effected thereto by those skilled in the art without departing from the spirit of the invention, are deemed to be within the scope and spirit of the invention.