WO2011079613A1

WO2011079613A1 - Feed water and drainage system for medium pressure heater in power plant

Info

Publication number: WO2011079613A1
Application number: PCT/CN2010/075272
Authority: WO
Inventors: 申松林; 陈仁杰; 施刚夜; 叶勇健; 林磊
Original assignee: 中国电力工程顾问集团华东电力设计院
Priority date: 2009-12-30
Filing date: 2010-07-20
Publication date: 2011-07-07
Also published as: EP2520855A4; EP2520855A1; CN102116469B; CN102116469A

Abstract

A feed water and drainage system for a medium pressure heater in a power plant comprises a feed water piping line (100) and a feed pump unit (200) provided on the feed water piping line (100). The feed pump unit (200) includes a low pressure feed water pump (203) and a high pressure feed water pump (204) provided along upstream and downstream of the feed water piping line (100). A medium pressure feed water heater unit (300) comprising one or more than one single feed water heaters is provided between the low pressure feed water pump (203) and the high pressure feed water pump (204). A power set and a power plant device comprising the feed water and drainage system for the medium pressure heater are provided. The feed water and drainage system for the medium pressure heater is low in cost, high in efficiency of thermodynamic system and more environment-friendly.

Description

Power plant medium pressure heater water supply and drainage system

This invention relates to heater feed water and drainage systems, and more particularly to power plant heater feed water and hydrophobic systems. Background technique

Under the national “energy saving and emission reduction” policy and the world's environmental trends, environmental protection and greenhouse gas emissions caused by climate warming make the energy conservation task of the power plant equipment industry significant.

At present, when using thermal power generation, in order to save energy, part of the steam that is often used for heating is used to heat the water supply. A steam turbine with a feed water returning heat and a circulation device thereof as disclosed in the "Electrical Engineer's Manual". The utility model is characterized in that the boiler and the steam turbine are connected by a superheated steam pipe, and the steam turbine is sequentially connected with a condenser, a feed water pump and a steam extraction heater, and the steaming heater is connected to the boiler through the water supply pipe, and some of the steam turbines are connected. After the intermediate stage, the heat extraction tube is connected and directly connected to the extraction heater. In the feed water regenerative cycle device, since the heat of the steam exhausted by the steam turbine is used to heat the feed water, the loss of the cold source of the cycle is reduced, so that the thermal efficiency is higher than that of the feed water heat recovery cycle in the case where the steam has the same initial and final parameters.

As shown in Fig. 1, a common specific configuration of a feedwater heater of an existing power plant apparatus is shown. In this configuration, the water supply pipe set 200a is provided from the deaerator 1 to the water supply pipe system 100 of the boiler 4, and the feed water pump set 200a (generally including the feed water pre-pump 201a and the main feed water pump 202a) is provided with a feed water heater 300a downstream. unit. Since the outlet pressure of the feed water pump set 200a is relatively high, the water side pressure of the feed water heater unit 300a is correspondingly high, and therefore, the existing configuration of the feed water heater apparatus is expensive, and this situation is more remarkable in the supercritical and above parameter units. In addition, since the feed water pressure downstream of the feed water heater unit 300 in the prior configuration is high, the feed water heater unit 300a (may be composed of one or more feed water heaters, such as the first feed water heater 301a, the second feed water in FIG. The heater 302a and the third feed water heater 303a) self-flow the steam side of the feed water heater step by step, and finally discharge to the deaerator 1 through the drain pipe 205a. Relatively speaking, the relative thermal system of the existing configuration is less efficient.

In summary, there is a lack of a water heater and a hydrophobic system for power plant equipment in a power plant with reduced cost, high efficiency of the thermal system, and more environmental protection. Summary of the invention

The first object of the present invention is to obtain a cost reduction, a high efficiency of a thermal system, and a more environmentally friendly hair. Power plant equipment heater water supply and drainage system.

A second object of the present invention is to achieve a supercritical generator set or an ultra-supercritical generator set with reduced cost, high efficiency of the thermal system, and more environmental protection.

A third object of the present invention is to obtain a power plant apparatus which is reduced in cost, highly efficient in a thermal system, and more environmentally friendly. In a first aspect of the present invention, there is provided a medium pressure heater water supply and drain system for a power plant, comprising a water supply system, and a feed pump unit disposed on the water supply pipe system,

among them,

The feed pump unit includes a low pressure feed pump and a high pressure feed pump disposed upstream to downstream of the water supply pipe system;

- an intermediate pressure feedwater heater unit is provided between the low pressure feed pump and the high pressure feed pump, the feedwater heater unit consisting of one or more single feedwater heaters. In a specific embodiment of the present invention, the head of the low pressure feed pump is 30-60% of the total head, and the total head is the sum of the lifts of the low pressure feed pump and the high pressure feed pump. In a specific embodiment of the present invention, the head of the low pressure feed pump (203) is 1200-2400 m 0; preferably 1200-1800 mH. In one embodiment of the invention, the head of the high pressure feed pump (204) is 1600. - 2800 mH ₂ 0 ; preferably 2200-2800 mH In one embodiment of the invention, the water side pressure of the feed water heater unit (300) is between 5 and 24 MPa. In one embodiment of the invention, the feedwater heater unit (300) consists of a single row of 2-3 or a double row of 4-6 individual feedwater heaters. In one embodiment of the invention, the steam side of the single or individual feedwater heaters of the feedwater heater unit (300) is provided with a hydrophobic self-flow conduit (205). In a specific embodiment of the present invention, the steam side of the feedwater heater unit (300) is provided with a drain pump

(206). In a specific embodiment of the present invention, in the feed water pump unit (200), a feed water pre-pump (201) is disposed upstream of the low pressure feed water pump (203). A second aspect of the invention provides a supercritical generator set or an ultra-supercritical generator set comprising a medium pressure heater feed water and a water shutoff system of a power plant apparatus according to the invention. A third aspect of the invention provides a power plant apparatus for a medium pressure heater feed water and a hydrophobic system of a power plant apparatus according to the present invention. The advantages of the invention are:

The medium pressure heater and the water supply system are lower in cost than the prior art high pressure heater and water supply system. On the other hand, the medium pressure heater is convenient to set a drain pump in its hydrophobic system, which is more hydrophobic than the prior art. The system thermal system is more efficient and environmentally friendly. BRIEF abstract

Figure 1 shows a prior art high pressure heater feed water and drain system.

2 is a medium pressure heater feed water and drain system in accordance with an embodiment of the present invention.

3 is a medium pressure heater feed water and drain system according to another embodiment of the present invention.

4 is a medium pressure heater feed water and drain system according to another embodiment of the present invention.

Figure 5 is a flow diagram of a medium pressure heater feed water and draining system in accordance with another embodiment of the present invention.

Figure 6 is a schematic diagram of a medium pressure heater feed water and drain system in accordance with another embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

The inventors have conducted extensive and intensive research to obtain a new configuration of a feed water heater by improving the preparation process. This configuration can reduce the overall cost of the project, improve the efficiency of the thermoelectricity, and adopts simple and easy technical means, has a wide range of economic and social benefits, and is particularly suitable for China's national conditions. In The present invention has been completed on the basis of this.

The invention provides a medium pressure heater water supply and drainage system for power plant equipment. The system comprises: a water supply pipe system; a feed water pump unit disposed on the water supply pipe system, the feed water pump unit comprising: a low pressure feed water pump and a high pressure feed water pump; medium pressure heating between the low pressure and high pressure feed water pump The medium pressure heater is provided with a drain pipe and a drain pump. Wherein, the feed water from the deaerator is pressurized once along the water supply pipe through the low pressure feed water pump, and then enters the medium pressure heater, and the heated feed water is again pressurized by the high pressure feed water pump, and finally enters the boiler. The steam of the feed water heated by the medium pressure heater is condensed to be hydrophobic, and the hydrophobic water is returned to the deaerator or the water supply system through the hydrophobic pipe and the drain pump.

The concept of the invention is as follows:

The invention is based on the basic principle of the thermodynamic cycle, and divides the feed pump group before the feedwater heater into a low pressure feed pump and a high pressure feed pump, and arranges the low pressure feed pump before the feed water heater, and the high pressure feed pump is arranged after the feed water heater, The total head of the pump unit is redistributed (the total head is basically equivalent to the conventional configuration). The head of the low-pressure feed pump before the feedwater heater meets the requirements of the sub-cooling degree of the feedwater heater, and the cavitation of the high-pressure feed pump after the feedwater heater is satisfied. The margin requirement requires that the high pressure feed pump head meets the boiler feed water requirements. In this system configuration, after the feed water heater is located behind the low pressure feed water pump and before the high pressure feed water pump, the water side pressure of the feed water heater is low, and the feed water heater equipment is relatively low in cost; and the water supply system before and after the feed water heater (including Pipes, valves, pipe fittings, etc. have lower pressure and the pipe cost is relatively low. This can reduce the overall cost of the project.

At the same time, the pressure of the feed water after the medium pressure heater is relatively low, which is convenient for supporting the use of a hydrophobic pump, and the hydrophobicity of the heater is driven into the water after the heater, and the relatively hydrophobic step-by-step self-flow system improves the efficiency of the thermal system. Some of the terms of the invention are explained as follows:

In the present invention, "water supply" is a water supply directed to the boiler.

In the present invention, "medium pressure heater" means a heat exchange device that heats the feed water by steam, wherein the pressure of the feed water is between the high pressure at the outlet of the feed pump group and the low pressure at the inlet of the feed pump group. Medium pressure heaters are known to those skilled in the art and may be based on engineering manuals in the art.

In this paper, the "power plant equipment" includes: thermal power plant equipment, nuclear power plants, biomass power plant equipment, gas turbine power plants, steel chemical papermaking equipment, other industry-owned power plants, but not limited to this unless otherwise defined or It is to be understood that all the professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art, for example, as described in "Thermal Power Plant Equipment, Zheng Tikuan, Beijing: China Electric Power Press, 2001". In addition, any methods and materials similar or equivalent to those described Both can be applied to the present invention. Various aspects of the invention are detailed below:

Feed pump unit

In order to reduce the cost and increase the thermoelectric efficiency, the feed water pump unit of the present invention includes a low pressure feed water pump and a high pressure feed water pump disposed upstream to downstream of the water supply pipe system.

The low pressure feed pump and the high pressure feed pump are relatively speaking concepts.

Specifically, the head of the low pressure feed pump is 30-60% of the total head, and the total head is the sum of the lifts of the low pressure feed pump and the high pressure feed pump.

Specifically, the head of the high pressure feed pump is 40-70% of the total head, and the total head is the sum of the lifts of the low pressure feed pump and the high pressure feed pump.

More specifically, the pressure of the low pressure feed pump is typically 40-70% lower than the high pressure feed pump, preferably 40-60% lower, calculated as the pressure of the high pressure feed pump.

More specifically, the head of the low pressure feed pump is 1200-2400 mH ₂ 0; preferably 1200-1800 m 0. More specifically, the head of the high pressure feed pump is 1600-2800 mH ₂ 0; preferably 2200-2800 m 0 . More specifically, in the feed water pump unit, a feed water pre-pump may be disposed upstream of the low pressure feed water pump. The head of the feedwater front pump may be between 5-10% of the total head, and the total head is the sum of the lifts of the low pressure feed pump and the high pressure feed pump.

Those skilled in the art can make routine substitutions or alterations to the embodiments of the invention. Medium pressure feedwater heater unit

In the present invention, the medium pressure feed water heater unit is disposed between the low pressure feed water pump and the high pressure feed water pump. The medium pressure feedwater heater unit may be comprised of one or more single feedwater heaters.

More specifically, the medium pressure feedwater heater unit consists of a single row 2-3 or a double row of 4-6 individual feedwater heaters.

The feedwater heater of the present invention may employ at least one medium pressure feedwater heater or an optional high pressure feedwater heater. Preferably, all of the medium pressure feed water heaters are employed. The "medium pressure feedwater heater" of the present invention is well known to those skilled in the art. Specifically, the water side pressure of the feedwater heater unit may be between 5 and 24 MPa.g depending on the scale of the power plant. The method for measuring the water side pressure is based on an electrical engineering manual.

The steam side of the single or individual feedwater heaters of the feedwater heater may be provided with a hydrophobic self-flow conduit. The arrangement of the hydrophobic self-flowing conduit can be carried out according to conventional processes in the art. For example, according to electrical engineering in the field The manual is carried out.

A hydrophobic pump may be provided on the steam side of the single or individual feedwater heaters of the feedwater heater. The arrangement of the hydrophobic pump can be carried out according to a conventional process in the art. For example, according to the electrical engineering manual in the field.

When a plurality of (more than or equal to two) feedwater heaters are provided for the feedwater heater unit, the hydrophobic self-flow conduit and the drain pump may be combined.

In the prior art, high pressure heaters must generally be employed due to the higher outlet pressure of the feed pump set. The "high pressure" is well known to those skilled in the art. For example, the high pressure heater has a steam pressure not lower than

1. 5 MPa, including but not limited to 1. 5 MPa - 10 MPa; water pressure is preferably 20-40 MPa. The above pressure can be adjusted accordingly by those skilled in the art based on the scale of the power plant equipment according to the engineering manual.

The inventors have found that by redistributing the total lift of the feed pump group, the total lift is basically equivalent to the conventional configuration, and the function of reducing the pressure of the high-pressure heater water supply system is achieved while satisfying the function of the water supply system, thereby reducing the heating of the feed water. Equipment costs, while creating a good condition for the use of a hydrophobic pump to improve the efficiency of the thermal system. Power plant medium pressure heater water supply system

The power plant heater water supply system of the present invention comprises a water supply pipe system, a feed water pump unit composed of a low pressure feed water pump and a high pressure feed water pump disposed upstream to downstream of the water supply pipe system, the low pressure feed water pump and the high pressure feed water pump A feedwater heater unit is provided between. Wherein the feedwater heater unit consists of one or more single feedwater heaters. Power plant medium pressure heater drainage system

The power plant heater hydrophobic system of the present invention includes a hydrophobic piping system, a hydrophobic pump disposed along the hydrophobic piping system. Wherein each of the water supply heater unit steam side is provided with a hydrophobic pipe system, and each of the water supply heater unit hydrophobic pipes is provided with a drain pump. Supercritical generator set or ultra-supercritical generator set, power plant

The present invention also provides a supercritical generator or ultra-supercritical generator set containing the medium pressure heater feed water and drain system of the power plant.

The supercritical genset or ultra-supercritical genset can be carried out in accordance with conventional configurations in the art, differing from the prior art by the use of the power plant heater feed water and drainage system of the present invention. The supercritical or ultra-supercritical generator sets and their configurations are well known to those skilled in the art. The present invention still further provides a power plant apparatus comprising the power plant heater feed water and drain system of the present invention.

The configuration of the power plant apparatus can be carried out in accordance with a conventional configuration in the art, which differs from the prior art in the use of the power plant medium pressure heater feed water and drain system of the present invention. Other aspects of the invention will be apparent to those skilled in the art from this disclosure.

The invention is further illustrated below in conjunction with specific embodiments. It is to be understood that the examples are merely illustrative of the invention and are not intended to limit the scope of the invention. The experimental methods in the following examples which do not specify the specific conditions are usually carried out according to conventional conditions or according to the conditions recommended by the manufacturer. Example

2 to 6 show a specific embodiment of the water supply and drain system of the medium pressure heater of the power plant of the present invention. Among them, the medium-pressure heater water supply and drainage system of the power plant is part of the steam turbine power generation thermodynamic cycle system. Figures 2 to 6 show a single row of three full-capacity heaters, which are also applicable to a single row of two full-capacity heaters, two columns of two half-capacity heaters, and two columns of three half-capacity heaters. . The power plant heater water supply system and the drainage system consist of the following main components:

1) Low pressure feed pump (group) 203;

2) medium pressure feedwater heater unit 300;

3) High pressure feed pump 204;

4) Optional heater drain pump 206;

5) water supply system 100;

6) an optional heater drain pipe, that is, a hydrophobic self-flow pipe 205;

7) Optional feedwater front pump 201.

As shown in FIG. 2, a specific embodiment of a power plant heater water supply system according to the present invention includes a water supply pipe system 100, a feed water pump unit 200 disposed on the water supply pipe system, and the feed water pump unit 200. A low pressure feed water pump 203 and a high pressure feed water pump 204 disposed upstream to downstream of the water supply pipe system 100 are provided; and a medium pressure feed water heater unit 300 is disposed between the low pressure feed water pump 203 and the high pressure feed water pump 204, The feed water heater unit 300 is composed of a first medium pressure feed water heater 301 and a second medium pressure feed water heater 302. And a third medium pressure feed water heater 303.

In the conventional power plant system, there are low-pressure heaters and high-pressure heaters. The heater between the condensate pump and the deaerator is usually called a low-pressure heater, and the water-side pressure is less than 5 MPa. g; The heater between the boilers is called a high pressure heater and its water side pressure is greater than 24 MPa.g. The water side pressure of the heater in the present invention is between 5 and 24 MPa. g, and is relatively a medium pressure heater.

In other alternative embodiments, the feedwater heater unit 300 may also be comprised of one or more (not limited to three) single feedwater heaters. The water side pressure of each of the feed water heaters of the feed water heater unit 300 is usually between 5 and 24 MPa.g. A hydrophobic self-flow pipe 205 is disposed on the steam side of each of the feed water heaters of the feed water heater 300.

The head of the low pressure feed water pump 203 is 30-60% of the total head, and the total head is the sum of the lifts of the low pressure feed water pump 203 and the high pressure feed water pump 204. The head of the low pressure feed water pump 203 is 1200-2400 mH ₂ 0. The head of the high pressure feed water pump 204 is 1600-2800 mH ₂ 0. In the feed water pump unit 200, a feed water pre-pump 201 is disposed upstream of the low pressure feed water pump 203. In other alternative embodiments, the feedwater pre-pumps 201 can also be combined, as shown in FIG.

4 is a specific embodiment of a power plant heater water supply system of the present invention, in which a steam pump 206 is disposed on the steam side of each feed water heater of the water heater. If the feedwater heater is equipped with a drain pump, the hydrophobic cooling section of the feedwater heater can be eliminated, thereby reducing the cost of the feedwater heater and increasing the efficiency of the thermal system.

5 is a specific embodiment of a power plant heater water supply system of the present invention. Two steam pumps 206 and one hydrophobic self-flow pipe 205 are sequentially disposed on the steam side of each feed water heater of the feed water heater 300.

6 is a specific embodiment of a power plant heater water supply system of the present invention. The steam side of each feed water heater of the feed water heater 300 is sequentially provided with a drain pump 206 and two hydrophobic self-flow pipes 205. The system flow is as follows:

The low pressure feed water from the deaerator 1 passes through the low pressure feed water pump (group) 203, the feed water pressure is increased to medium pressure, the medium pressure feed water is passed through the medium pressure feed water heaters 300, the temperature is gradually increased, and finally the high pressure feed water pump 204 is passed. The feed water pressure is increased to a high pressure to meet the water supply requirements of the boiler 4.

The steam of the medium pressure feed water heater 300 is condensed into water after heat exchange, and the water is pressurized by the drain pump 206 and then enters the water supply pipe system 100, thereby improving the cycle efficiency of the heat system. The low-pressure feed water pump (group) in front of the medium-pressure heater may be separately set as the feed water pre-pump 201 and the low-pressure feed pump 203 (see FIG. 2) according to specific conditions, or may be the feed water pre-pump 201 and the low-pressure feed pump 203. Combine into a pump or pump set (see Figure 3).

The high pressure feed pump 204 can be driven by a different motor or small steam turbine separately from the low pressure feed water pump 203 and the feed water front pump 201, or can be coaxially driven by the same motor or small steam turbine.

The medium-pressure heater can be completely self-flowing without a drain pump 206 (see Figures 2 and 3). It can also be equipped with a drain pump 206 (see Figure 4), or a part of the drain pump 206 (see figure 5, 6) to improve the efficiency of the thermal system. The effects of the present invention are as follows:

The key point of the present invention is that the feed water pump group before the feed water heater is split into at least two pumps connected in series, and the water supply pressure at the front of the pump outlet is low (for example, for the 1000 Li super supercritical unit, the outlet pressure is about 13 MPa. ), referred to as low pressure feed pump 203, the downstream feed pump outlet pressure is relatively high (for example, for a 1000 MW ultra-supercritical unit, the outlet pressure is about 36 MPa. g), called the high pressure feed pump 204, and the low pressure pump 203 is placed at the feed water. Before the heater 300, after the high pressure pump 204 is disposed in the feedwater heater 300, the total lift of the feedwater pump group is redistributed, and the total lift is substantially equivalent to the conventional configuration.

The head of the feed water pump of the feed water heater 300 satisfies the requirement of the subcooling degree of the feed water after the feed water heater, and satisfies the requirement of the cavitation allowance of the feed water pump after the feed water heater, and the outlet pressure of the high pressure feed water pump 204 satisfies the water supply requirement of the boiler 1. In this system configuration, after the feed water heater is located behind the low pressure feed water pump and before the high pressure feed water pump, the water side pressure of the feed water heater is lower, and the water supply heater cost equipment is relatively low; at the same time, the feed water heater front and rear, the low pressure feed water pump and the high pressure The water supply pipe system (including pipes, valves, pipe fittings, etc.) between the feed pumps is under low pressure, and the pipe system is relatively low in cost. This can reduce the overall cost of the project.

At the same time, according to the present invention, the feed water pressure downstream of the feed water heater is relatively low, and the feed water heater is more convenient to configure the drain pump to deliver the hydrophobic water to the feed water downstream of the feed water heater, thereby improving the efficiency of the heat system.

In summary, while satisfying the function of the water supply system, the purpose of reducing the pressure of the high-pressure heater water supply system is achieved, thereby reducing the cost of the feedwater heater equipment, and at the same time creating favorable conditions for using a hydrophobic pump to improve the efficiency of the thermal system. Specifically, for a 1000 MW ultra-supercritical generator set, the total lift of the feed pump set is approximately 3600 m 0 . According to the prior art, the design pressure of the heater behind the feed water pump set is about 36 MPa. g, and the heater is high pressure. If the pump unit is split into a low pressure feed pump and a high pressure feed pump, the low pressure feed pump is placed in front of the feed water heater, high After the pressure feed pump is arranged in the feed water heater, the low pressure feed pump head is about 1300mH ₂ 0, the high pressure feed pump head is about 2300mH ₂ 0 , the heater design pressure between the feed pumps is reduced to about 13MPa. g, the heater is low pressure, now Under the price system, the cost of the water heater equipment for each unit is reduced by about 3 million yuan, the cost of the water supply system is reduced by about 3 million yuan, and the total cost is reduced by about 6 million yuan. The cost will fluctuate with market changes and is for reference only. But the effect of reducing costs is obvious.

At the same time, according to the invention, the feed water pressure downstream of the feed water heater is relatively low, and the feed water heater is conveniently arranged with a drain pump to transport the steam side to the feed water downstream of the feed water heater, thereby improving the efficiency of the heat system.

For example, for a 1000 MW ultra-supercritical generator set, the feedwater heater is equipped with a drain pump, the efficiency of the thermal system is increased by about 0.2%, and the annual coal consumption per unit is about 3,000 tons. According to the market price, the income is about 2 million yuan. More importantly, the present invention provides a more environmentally friendly technical solution. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the technical scope of the present invention. The technical content of the present invention is broadly defined in the scope of the claims of the application, any technical entity completed by others. The method or method, if it is identical to the scope of the claims, or equivalents, is considered to be within the scope of the claims.

All documents mentioned in the present application are hereby incorporated by reference in their entirety in their entireties in the the the the the the the the the In addition, it should be understood that various modifications and changes may be made by those skilled in the art in the form of the present invention.

Claims

Rights request

A medium-pressure heater feed water and drain system for a power plant, comprising a water supply pipe system (100), a feed water pump unit (200) disposed on the water supply pipe system,

among them,

The feed pump unit (200) includes a low pressure feed water pump (203) and a high pressure feed water pump (204) disposed upstream to downstream of the water supply pipe system (100);

- an intermediate pressure feedwater heater unit (300) is provided between the low pressure feed water pump (203) and the high pressure feed water pump (204), the feed water heater unit (300) being comprised of one or more single feedwater heaters composition.

2. The system according to claim 1, wherein the head of the low pressure feed pump (203) is 30-60% of the total head, and the total head refers to the low pressure feed pump (203) and the high pressure feed pump. (204) The sum of the lifts.

3. System according to claim 1, characterized in that the head of the low-pressure feed water pump (203) is 1200-2400 mH ₂ 0 _; preferably 1200-1800 m 0.

4. The system according to claim 1, wherein said high-pressure feed pump (204) of the head is 1600-2800mH ₂ _0; preferably 2200- 2800m 0.

The system according to claim 1, wherein the water supply pressure of the feedwater heater unit (300) is between 5 and 24 MPa.g.

6. The system of claim 1 wherein said feedwater heater unit (300) is comprised of a single row 2-3 or a double row of 4-6 single feedwater heaters.

7. System according to claim 1, characterized in that the steam side of the single or individual feedwater heaters of the feedwater heater unit (300) is provided with a hydrophobic self-flow conduit (205).

8. System according to claim 1, characterized in that a hydrophobic pump (206) is provided on the steam side of the feedwater heater unit (300).

9. A supercritical hair supply comprising a medium pressure heater feed water and a hydrophobic system of a power plant according to claim 1. Motor unit or ultra-supercritical generator set.

10. A power generation J apparatus comprising the medium pressure heater feed water and drain system of a power plant according to claim 1.