KR20140088672A

KR20140088672A - Power-saving hybrid power plant

Info

Publication number: KR20140088672A
Application number: KR1020130000463A
Authority: KR
Inventors: 이종혁
Original assignee: 이종혁
Priority date: 2013-01-03
Filing date: 2013-01-03
Publication date: 2014-07-11

Abstract

The present invention relates to a hybrid type solar and thermal power generation system. The purpose of the present invention is to provide the hybrid type solar and thermal power generation system that can achieve continuous and stable generation capacity of the entire generation system even if a solar power generation facility has a large variation in an acquired steam volume according to time, a season, and weather, and may exclude an additional facility for steam control, which requires different conditions (pressure and temperature of the steam) according to a heating means (solar and thermal power), thereby simplifying the entire system and improving generation efficiency. The hybrid power generation system using solar heat and coal-fired heat of the present invention comprises a first boiler producing steam from a fossil fuel, a first steam turbine generating electric power from the steam produced by the first boiler, a second boiler producing steam from solar heat, a second steam turbine generating the electric power from the steam produced by the second boiler, wherein the steam discharged from the second steam turbine is circulated by passing a condenser and being supplied to a main discharge pipe drawn out from the first steam turbine, and the electric power generated by the solar and thermal power generation system is resupplied to a home.

Description

[0001] Power-saving hybrid power plant [0002]

The present invention relates to a hybrid solar thermal power generation system, and more particularly,

It is about a hybrid power generation system that is economical and efficient, and most of all it relates to power consumption reduction.

Recently, carbon dioxide abatement technologies emitted from power plants, which are considered to be major causes of global warming,

Energy and geothermal energy, and among them, research on solar energy

And the power shortage phenomenon is generated by using a lot of electric power.

Among these renewable energies, technology development for generating facilities using solar energy is being actively carried out.

Until recently, solar power generation facilities have been producing steam from solar collectors and using this steam

By turning the steam turbine to generate mechanical energy, and taking the way to produce electricity from this mechanical energy

Such solar energy-based power generation facilities have a high installation cost, a large construction area,

But the quality (pressure and temperature) of the steam produced according to the type of the solar collecting means used is different

The quality of steam (pressure and temperature) that can be obtained from environmental factors such as time, season,

And thus it is not possible to acquire continuous capacity to the amount of electricity that can be obtained.

There is a problem that can not be solved.

Recently, attention has been focused on hybrid power generation facilities that use two or more power generation facilities in parallel.

As a result, solar power is combined with thermal power generation facilities, and there is a more economical and efficient environmentally friendly power generation facility.

Conventionally, in the case of a power generation system in which the solar heat and the thermal power are combined in parallel,

Considering the economical aspect of fossil fuels, by supplying the boiler with steam generated from fossil fuels to the common boiler

It takes one form.

For example, when the collection of solar heat is low, the operation of boilers using thermal power is mainly used,

A hybrid type power plant having a control system mainly for the operation of a boiler using solar heat is attempted in the daytime

"He said.

However, the conventional hybrid power generation facility uses steam and thermal power to produce steam from a single boiler,

The produced steam is used to produce electrical energy by using a common steam turbine. Depending on time, season, weather, etc.

There is a problem in that the efficiency of the entire power generation system is lowered by the solar collecting means having a large variation in the acquired capacity.

In addition, in the case of solar power generation, the installation cost and the required area of the solar heat collecting plate are large, which is not only economically disadvantageous,

Each steam produced in the production of steam from the power and solar heat has a different quality (pressure and temperature conditions)

Bar and boiler water preheater. As a result, hybrid systems are complex and each system

When steam of different quality is injected into the turbine, a separate design is required and not only the efficiency of the turbine is reduced

It becomes difficult to control the condition of the necessary steam.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art,

In producing steam from the first boiler for thermal power generation, not only the water for the first boiler in the thermal power generation system

By preheating both the water supply for the second boiler for solar power generation and sending the necessary flow rate to each of them,

Minimize the installation of the heat collecting plate required for preheating and install the necessary additional equipment such as water heater preheater and deaerator for solar boiler

Thereby improving the economical efficiency.

Another object of the present invention is to separately control the steam produced in the power generating system of each of the solar heat power and the thermal power power,

Hybrid type solar control system for controlling steam (steam pressure and temperature state)

Thermal power generation system.

Another object of the present invention is to provide a solar power generation facility having a large variation in steam capacity obtained by time, season,

Hybrid solar thermal system that can meet the continuous and stable power generation capacity of the whole power generation system despite this change

Power generation system, and to provide the generated electric energy for home use again.

In order to accomplish the above-described object and to eliminate the conventional drawbacks, the present invention provides a solar-

In a power generation system,

A first boiler for producing steam from fossil fuel, and a second boiler for producing electrical energy from the steam produced from said first boiler

A second boiler for producing steam from the first steam turbine, the condenser, and the solar heat, and a second boiler for producing steam from the second boiler,

A second steam turbine and a condenser, each of which generates electric energy,

In the above fossil fuel power generation system, not only the first boiler but also the joint water preheater and deaerator necessary for the second boiler are installed

The system is designed to supply and circulate the required amount of water to each system, which compensates for the insufficient power.

From the above-mentioned means, the present invention can be applied not only to the water supply for the first boiler in the system for thermal power generation,

By preheating all of the boiler water supply and sending the necessary flow to each, it is necessary to preheat the water in the solar power generation system.

Minimizing the installation of the heat collecting plate and eliminating the necessary facilities such as the water preheater and deaerator for the solar boiler,

There is an advantage that it can be improved.

The invention also relates to a steam turbine comprising a first boiler and a first steam turbine for solar power generation, and a second steam turbine and a second steam turbine for thermal power generation,

By separately controlling the steam produced under different conditions, it is possible to reduce the amount of steam generated in the piping and turbine

To prevent problems and to provide additional equipment for controlling temperature and pressure conditions for mixed steam of these different conditions

It is possible to reduce the equipment cost of the entire power generation system and simplify the system.

In addition, despite the variation of steam and electric capacity produced from solar power generation facilities,

It can maintain the stable output of the equipment and can respond to the expected output change according to time, season,

There is an advantage that the output change of the system can be freely implemented in a stable and quick manner. Also, there is an advantage that electric power produced by the generators of the first steam turbine and the second steam turbine can be re-supplied to the home to reduce power consumption.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a hybrid solar thermal power generation system according to an embodiment of the present invention,
2 is a schematic diagram of a hybrid solar thermal power generation system according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1, a hybrid power generation system (1) in which a thermal power generation plant (1) and a solar thermal power generation plant (2)

Comprises a first boiler (11) for producing steam from the pyrotechnic fuel, a first steam turbine (12) for producing electrical energy from the steam,

A second boiler 21 for producing steam from solar heat, and a second steam turbine 22 for producing electrical energy from the steam

Independently installed and installed in the thermal power generation system, not only the water for the first boiler but also the water for the second boiler for the solar power generation

All of them are preheated, and the required flow rate is sent to each, so that the installation of the heat collecting plate necessary for water preheating in the solar power generation system

It is necessary to minimize the number of solar heaters and to install a water preheater and deaerator for a solar boiler,

Eliminating the need for separate system equipment to match steam conditions, thereby simplifying overall system installation and control

Therefore, it is possible to reduce the construction cost and the power generation cost of the entire power generation system by improving the water preheating efficiency.

More particularly, the present invention relates to a steam turbine comprising a first boiler (11) for producing steam from fossil fuel, a first steam turbine (12), a generator (13)

(1) including a water heater (14), a plurality of water supply preheaters (16) and (19), water feed pumps (15) and (18)

(2) including a second boiler (21) and a second steam turbine (22) that produce steam.

The thermal power generation plant 1 according to an embodiment of the present invention includes a first boiler 11, a first steam turbine 12, a generator 13, a condenser 14,

A low pressure pump 15, a low pressure water preheater 16, a deaerator 17, a high pressure pump 18, and a high pressure water preheater 19.

The first boiler 11 produces steam from the fossil fuel,

A combustion furnace 110 in which a burner as a heating means is mounted, and a heating furnace for heating the feed water by the combustion heat of the fuel

A drum 111 for separating water and water vapor, and an evaporator 112 for circulating the water not separated by the steam to evaporate again,

And a superheater 113 for superheating the steam generated from the drum 111 until a set temperature is reached

.

The steam produced through the first boiler 11 having such a configuration is converted into mechanical energy by rotating the first steam turbine 12,

(13) to produce electricity from mechanical energy.

After the first steam turbine 12 is turned, the steam discharged in a low energy state is discharged through the main discharge pipe D,

And is circulated to the first boiler 11 through the generation and preheating process.

That is, the condenser 14, the low-pressure pump 15, the low-pressure water preheater 16, the deaerator 17, the high-pressure pump 18,

And is installed on the main discharge pipe (D).

The discharge steam discharged through the main discharge pipe (D) is condensed through the condenser (14), and the condensed water passes through the low-

Is supplied to the low-pressure water pre-heater (16) through the high-pressure water pre-heater (15) and is preheated through the low-pressure water pre- These low-pressure water preheaters

(16) may be provided in plural as required. Thereafter, the low-pressure water is supplied to the boiler drum 111 and the steam turbine 12

The gas in the feed water is removed through the deaerator 17 for preventing corrosion and then the feed water in the low pressure state is passed through the high pressure pump 18

Is supplied to the high-pressure water pre-heater (19) and reheated through the high-pressure water pre-heater (19). The high pressure water preheater 19

A plurality of units may be provided.

The water heated to a predetermined temperature through the high-pressure water pre-heater 19 is supplied to the first boiler 11 through the economizer 115

And then supplied to the drum 111 again. (Normally, in a thermal power boiler, evaporation takes place in a combustion furnace,

Overheat steam using high temperature flue gas. Thereafter, the temperature of the flue gas is still released to the atmosphere

As a means for recovering the sensible heat of the flue gas, the water supplied from the water preheater is used as a means for recovering the sensible heat of the flue gas from the end of the boiler

After the boiler is further heated, it is supplied to the boiler drum.

It is called.

Meanwhile, the solar thermal power plant 2 according to an embodiment of the present invention includes a second boiler 21, a second steam turbine 22, a generator 23,

(24).

The second boiler 21 produces steam from solar heat. The second boiler 21 comprises a solar heat collecting means 210,

An evaporator 212 for producing water vapor by allowing water to be heated, a drum 211 for separating water and water vapor,

A circulation pump for circulating the water not separated by the steam again and the drum 211

And a superheater 213 for superheating the steam until the set temperature is reached.

The steam produced through the second boiler 21 is converted into mechanical energy by turning the second steam turbine 22,

To produce electricity from mechanical energy.

After the second steam turbine 23 is turned, the steam discharged in a low energy state is shown through the condenser 24

But is connected to the main discharge pipe (D) of the thermal power generation plant (1) through a discharge pipe (d) by a pump.

Generally, the amount of heat required to preheat the boiler during the steam production to drive the steam turbine will be

It consumes a large amount of heat to occupy more than 20% of the required calories. In this way,

Instead of getting the necessary heat from solar heat with a high installation cost and a large area,

, Which improves the economical efficiency and thermal efficiency of the entire power generation facility.

The discharge pipe d of the solar power generation facility 2 is supplied to the low pressure water preheater 16 through the low pressure pump 15 of the main discharge pipe D

.

As described above, the preheated water supplied through the low-pressure water pre-heater 16 and the high-pressure water pre-heater 19 of the main discharge pipe D is supplied to the first boiler 1

1) and the drum 211 of the second boiler (21).

That is, as shown in the drawing, the main exhaust pipe (not shown) connected to the drum 111 of the first boiler 11 or the drum 211 of the second boiler 21,

And a control valve (20) disposed at the end of the branch pipe (D) for interrupting the amount of water supplied to each branch pipe

All.

This control valve 20 is connected to the first boiler 11 and the second boiler 21 in accordance with the maximum driving conditions of the respective power plants 1,

The amount of water supplied to the second boiler (21) is adjusted when the operation of the solar power generation facility (2) is not possible.

So that the entire amount of water supply is supplied to the first boiler 11 of the thermal power plant 1.

The mixed steam discharged from the first steam turbine 12 and the second steam turbine 22 is condensed through each condenser 14 (24)

(D) to produce a mixed water supply, and stepwise preheating of the mixed water supply is performed

To supply water to the first boiler (11) or the second boiler (21), causing a lot of energy consumption in the solar power generation system

It is possible to drastically reduce the amount of equipment required for the water production and water preheating process,

Can be improved.

1 is an exploded perspective view showing a branch point of a main discharge pipe (D) supplied to a first boiler (11) and a second boiler (21)

The water preheater 19 is arranged at the outlet of the water preheater 19. However, as shown in FIG. 2 showing another embodiment of the present invention,

The branch point of the main discharge pipe D supplied to the first boiler 11 and the second boiler 21 is branched from the deaerator prior to the high pressure water pre-

(17).

This allows the difference in the pressure of steam between the first boiler 11 as the thermal power generation facility 1 and the second boiler 21 as the solar thermal power generation facility 2

It can be installed variously according to system conditions.

In addition, the first steam turbine 12 provided in the thermal power generation facility 1 is typically operated through a process of a high pressure turbine, a medium pressure turbine, and a low pressure turbine,

(Pressure and temperature conditions) of the thermal power plant 1,

When the first steam turbine 12 of the high-pressure turbine 12 is subjected to the process of the high-pressure turbine, the intermediate-pressure turbine, and the low-pressure turbine,

Is directed to the exit of the corresponding turbine, which is relatively similar to the conditions of the water vapor (pressure and temperature conditions)

(Not shown).

Each of the exhaust vapors passing through the first steam turbine 11 of the thermal power generation facility 1 and the second steam turbine 21 of the solar thermal power generation facility 2

(Pressure and temperature conditions) produced from the first boiler 11 and the second boiler 21 of the power generation plant,

The steam turbine can be driven in a lump or the steam turbine can be used for each application suited to the steam condition.

It does not require complex additions and changes to the system on the system as well as stable response.

Further, according to the present invention, due to the mixing of the condensed water discharged from each of the power generation facilities (1) and (2), a plurality

A low pressure pump 15, a low pressure water preheater 16, a deaerator 17, a high pressure pump 18 and a high pressure water preheater 19

It is possible to integrate liquefied water preheating facilities into one unit, and accordingly, the facilities required for preheating the water supply of the solar power generation facility (2)

The cost of the solar collecting means 210 of the solar power generation facility 2,

The installation area can be reduced, which can greatly reduce the production cost of solar power generation facilities.

In addition, the present invention is applicable to a solar power generation system in which the capacity change of the solar thermal power generation facility 2 having a large variation in the capacity of steam obtained by time,

, It is possible to provide the independent power of the thermal power generation plant 1 at a time when the capacity of the steam obtained through the solar power generation facility 2 is low

(1) through the continuous drive, and the amount of steam obtained through the solar power generation facility (2)

(1) and solar thermal power generation facilities (2), respectively, during the relatively high-capacity hours.

(1) and (2), and the condensed water discharged from the respective power generation facilities 1 and 2

Circulation, thereby improving not only the economical efficiency of the entire power generation system but also the efficiency

All. Electric energy produced by the generators 13 of the first steam turbine 12 and the generators 23 of the second steam turbine 22 can be replenished at home through the power supply controller 24. [

The present invention is not limited to the specific preferred embodiments described above, and it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims.

It will be understood by those skilled in the art that various modifications may be made without departing from the scope of the present invention.

And such changes are within the scope of the claims.

(1): thermal power plant (11): first boiler
(111), (211): drum (12): first steam turbine
(13), (23): generators (14), (24)
(15): low pressure pump (16): low pressure water preheater
(17): deaerator (18): high-pressure pump
(19): High pressure water preheater (20): Control valve
(D): main discharge pipe (2): solar power generation facility
(21): second boiler (22): second steam turbine
(d): discharge pipe (24): electric power supply control unit

Claims

In a hybrid power generation system using solar thermal and thermal power,
A first boiler (11) for producing steam from fossil fuel, and a second boiler (11) for generating electrical energy from the steam produced from said first boiler
A second boiler (21) for producing steam from solar heat, and a second boiler (21) for producing steam from the second boiler
And a second steam turbine (22) for producing electrical energy from the steam,
The exhaust steam discharged from the second steam turbine 22 is condensed in the condenser and then discharged from the first steam turbine 12
Is supplied to the main discharge pipe (D) to be supplied to the water supply of the first boiler (11) or the second boiler (21)
Wherein the solar thermal power generation system is a hybrid type solar thermal power generation system.

The method according to claim 1,
The main discharge pipe D discharged from the first steam turbine 12 is provided with a condenser 14 for condensing the steam and a low pressure pump 15
One or more low-pressure water preheater 16 for preheating the condensed water supplied through the water supply line,
Pressure water preheater 19 for preheating the water supplied from the deaerator 17 and the high-pressure pump 18
Is supplied to the drum (111) (211) of the first boiler (11) or the second boiler (21)
Solar Thermal Power Generation System.

3. The method according to claim 1 or 2,
The exhaust steam discharged from the second steam turbine 22 is condensed through the condenser 24 and flows into the main discharge pipe D
Pressure water supply preheater (16) to the inlet of the low-pressure water preheater (16).

3. The method according to claim 1 or 2,
The main discharge pipe D constitutes a branch pipe connected to the drum 111 of the first boiler or the drum 211 of the second boiler,
And a control valve (20) for interrupting the amount of water supplied to each branch pipe
Type solar thermal power generation system.

5. The method of claim 4,
The control valve (20) is connected to the water supply pipe through the deaeration device or to the inlet or outlet of the high-pressure water pre-
Wherein the solar thermal power generation system is a hybrid type solar thermal power generation system.

The thermal power generation system according to the household electric power supply system, by using the wider part of the electric energy produced, rather than the limited use.