KR102598363B1 - Combined cycle power generator - Google Patents

Abstract

The present invention relates to a combined cycle power plant, comprising: a combustion chamber for burning fuel; A fire area, which is a space where heat energy is generated by combustion of fuel in the combustion chamber; a metal pipe passing through a fire portion of the combustion chamber; Water supplied inside the metal pipe; the water passing through the metal pipe is converted into steam at the high-temperature hot area, and then the high-temperature steam at the hot area is sprayed by an injection device to combust the fuel at the hot area. By supplying the necessary oxygen, the effect of sufficiently supplying the oxygen necessary for combustion of fuel in the combustion chamber of the combined cycle power plant is achieved.

Description

Combined cycle power generator}

The present invention relates to a combined cycle power plant. More specifically, the present invention relates to a combined cycle power plant, and more specifically, to arranging a metal pipe in a coiled, spiral, or zigzag shape at a hot area of a thermal power plant, and to allow water or steam to pass through the metal pipe within the hot area. It relates to a combined cycle power generation device that allows water or steam passing inside a metal pipe to generate high-temperature steam due to the high heat of the fire area.

In general, thermal power generation equipment largely consists of a combustion unit, a steam generator, a turbine, and a power generation unit.

The combustion section generates high-temperature thermal power by supplying fuel such as coal and supplies heat energy to create high-temperature and high-pressure steam supplied to the turbine.

The steam generator receives high-temperature heat supplied from the combustion unit to primarily create saturated steam from the water flowing into the steam generator, and then heats the saturated steam to a high temperature to create high-temperature, high-pressure superheated steam.

The high-temperature, high-pressure superheated steam generated in the steam generator must have sufficient pressure to rotate the turbine.

Therefore, a lot of energy must be supplied from the combustion section, and a lot of energy is consumed.

The turbine rotates the turbine by spraying high-temperature, high-pressure superheated steam supplied from the steam generator onto the turbine blades.

As described above, the power of the steam injected at high temperature and high pressure to the turbine blade causes the turbine to rotate, and the rotational movement of the turbine generates electrical energy in the power generation device.

In this way, thermal energy is supplied through combustion of energy sources such as coal, water is converted into high-temperature, high-pressure steam using thermal energy, and the high-temperature, high-pressure steam is injected into the turbine to rotate the turbine, thereby converting the thermal energy into the turbine. A thermal power plant is a device that converts kinetic energy into electricity and generates electricity.

These thermal power plants supply heat energy by burning fuel from an energy source such as coal in a combustion section.

Using the energy from the combustion heat of the fuel, water is boiled to create saturated steam, the saturated steam is heated again to create superheated steam, and the superheated steam is fired at high pressure to the turbine blades to rotate the turbine.

A lot of energy is required to turn water into steam, and a large amount of oxygen is required to burn fuel such as coal.

Oxygen for burning fuel in a fire is generally supplied by forcibly blowing atmospheric air using a blower.

In this thermal power plant, the air needed for fuel combustion is supplied from the atmosphere by a blower, but there is a problem in that there is not enough oxygen to supply strong thermal power.

In addition, such thermal power generation devices have problems in that sufficient oxygen is not supplied to the fire to completely combust the fuel, so the combustion efficiency of the fuel supplied to the fire is reduced and the fire power of the fire is not as strong as the amount of fuel supplied.

For example, Patent Document 1 below discloses ‘a thermal power plant with a heat recovery function and an energy conversion method used in the thermal power plant.’

The thermal power generation device with a heat recovery function according to Patent Document 1 below may include a housing. A compressor is provided at the top of the housing, a vapor expansion device is provided at the bottom of the housing, and a pump for discharging the condensed portion to the outside is provided at the bottom of the lower part.

Phase separation can occur in a turbine according to the principle of centrifugation. The shape of the turbine blades is such that the vaporized working medium is separated and the parts can be discharged to the outside of the turbine through the condensation tube and residual vapor suction line.

The steam expansion device of a thermal power plant includes a working cylinder having an inlet valve for receiving vaporized working medium and a piston moving in the working cylinder.

There may be two working cylinders, and each of the two working cylinders is arranged to face the separation device. This means that the two working cylinders are arranged symmetrically opposite each other and connected to the same piston.

The thermal power plant includes a swing arm mechanism having at least one swing arm. The swing arm mechanism is connected to a compressor for compression of the non-condensable portion of the working medium and a pump for discharging the condensed portion from the separator.

A swing arm mechanism is accommodated in the housing of the separation device. The swing arm mechanism may drive the piston and actuating cylinder of the swing arm mechanism.

The swing arm is fastened to the piston of the vapor expansion device and the piston of the residual vapor compressor, and may be arranged to rotate about the lever axis.

The swing arm is connected to the crank mechanism and transfers the expansion work of the working medium from the working cylinder to the crank mechanism. Additionally, the crank mechanism transfers work to the generator.

The piston includes an outlet valve built into the piston and controlled by a diverting pin. The switching pin is guided with the help of the guide part of the piston and is fastened to the swing arm mechanism.

As the working medium expands, the outlet valve on one side closes and the outlet valve on the other side opens. The expanded vapor is discharged.

The compressor may include a compressor inlet valve and a compressor piston. The compressor inlet valve may be disposed on the compressor piston and may be adjusted by a piston rod. The piston rod may be connected to a swing arm mechanism. Compression of the non-condensable portion is therefore coupled with expansion of the vaporized working medium.

Patent Document 2 below discloses 'air preheating device for coal-fired power plant boiler'.

The air preheating device for a coal-fired power plant boiler according to Patent Document 2 below is a boiler for a coal-fired power plant having a furnace in which coal is burned to heat steam for thermal power generation, and an exhaust path through which exhaust gas generated from the furnace is discharged. It is applied to heat exchange the heat of the exhaust gas passing through the discharge path and supply combustion air preheated to a high temperature to the furnace.

By heating the combustion air supplied to the furnace to a high temperature, the combustion efficiency of coal is increased, thereby improving power generation efficiency.

In the above, the discharge path preferably consists of an exhaust duct connected to the exhaust port of the furnace, and the exhaust duct is connected to a purification treatment device to purify the exhaust gas and then exhaust it.

The air preheating device has a preheating body disposed in a heat exchange space having an inlet through which exhaust gas flows in and an outlet through which exhaust gas is discharged through the discharge path.

In the heat exchange space, the combustion air passing through the preheating body is heated to a high temperature by heat exchange with the exhaust gas.

In the above, the preheating body connects an inlet pipe for supplying air from the outside and an discharge pipe for supplying air to the furnace, and is composed of a plurality of branch pipes arranged at intervals to allow exhaust gas to move.

Heat exchange efficiency can be improved by structurally increasing the thermal contact area with the exhaust gas moving through the space between the branch pipes.

The continuous air supplied to the inlet pipe has a pump that sucks in external air and supplies it to the inlet pipe, and a filtration device is disposed in the area where air is sucked from the pump to filter out foreign substances from the sucked air. will be.

The air sucked in through the pump is filtered through the filtration device to prevent excessive foreign substances from being contained in the combustion air, thereby improving combustion efficiency more smoothly.

In the air preheating device, the branch pipes are bent in a zigzag shape to have a plurality of contact portions divided in a direction parallel to the direction of movement from the inlet to the outlet.

Combustion air moves in a zigzag pattern through the plurality of contact parts, thereby structurally increasing the thermal contact area and time with the exhaust gas, thereby making combustion air more smoothly heated.

As the temperature of the combustion air increases from the inlet side of the branch pipe to the outlet side of the branch pipe, the temperature of the combustion air becomes higher, making it possible to stably ensure the high temperature of the combustion air supplied to the furnace.

In the preheating body, the outlet of the branch pipe is disposed at one side of the inlet in the heat exchange space, and the inlet of the branch pipe is disposed at a corner portion facing diagonally with respect to the outlet of the branch pipe in the heat exchange space.

By supplying high-temperature combustion air to the inlet of the branch pipe to prevent condensation of exhaust gas, condensation water is prevented from being generated in the branch pipe located on the inlet side of the branch pipe.

In the above, the return pipe is made of a 'tube'-shaped pipe that connects the discharge and inflow pipes.

In the above, the discharge pipe is provided with a guide piece for guiding combustion air toward the reflux pipe, and the inflow pipe is provided with another guide piece for guiding combustion air induced from the reflux pipe to the branch pipe.

When it is desired to supply combustion air to the furnace, the combustion air sucked through the pump and supplied to the inlet pipe branches off into a plurality of movement paths in the heat exchange space through the branch pipe and is then discharged through the discharge pipe to become the main combustion air. is supplied through the bottom of the furnace, and secondary combustion air is delivered through the bottom of the furnace.

Combustion air moves in a zigzag shape through a plurality of contact parts constituting the branch pipe, exchanges heat with the exhaust gas, is heated to a high temperature, and is then discharged through the discharge pipe.

A part of the combustion gas discharged through the discharge pipe is guided to the reflux pipe by the guide piece, exchanges heat with the bottom of the branch pipe via the guide pipe, and is then guided to the inlet pipe and then to the inlet side of the branch pipe. After being mixed with the incoming combustion air, it is heated to a high temperature while passing through the heat exchange space again.

Republic of Korea Patent Publication No. 10-2016-0101008 Republic of Korea Patent Registration No. 10-1641666 Republic of Korea Patent Registration No. 10-1795732

The purpose of the present invention is to solve the problems described above, by arranging a metal pipe in a spiral, coil, or zigzag shape in the combustion chamber fire area of a combined cycle power plant, and allowing water or steam to pass through the metal pipe to ignite the fire. The water or steam passing through the inside of the metal pipe generates high-temperature steam due to the high temperature of the hot area, and the high-temperature steam generated at high temperature within the metal pipe is sprayed onto the hot area of the thermal power plant by a spray device. By supplying oxygen that is insufficient for the combustion of fuel within the fire area, the combustion efficiency of the fuel within the fire is improved and thermal power is increased, thereby improving thermal efficiency and reducing fuel consumption required for steam generation in the thermal power plant. The goal is to provide a combined cycle power plant that can improve economic benefits and thermal efficiency.

Another object of the present invention is to reduce the vaporization time of water by supplying sufficient oxygen to the flame of the thermal power plant, and to further increase the output of the thermal power plant by heating the saturated steam to a higher temperature and high pressure and spraying it on the turbine. The purpose is to provide a combined cycle power plant that can

Another object of the present invention is to provide a combined cycle power plant that can contribute to environmental protection by reducing carbon dioxide emissions through complete combustion of fuel burned in the combustion chamber by supplying sufficient oxygen to the flame of the thermal power plant.

In order to achieve the above-described object, the combined cycle power plant according to the present invention includes a combustion chamber 10 for burning fuel; A fire area (11), which is a space where heat energy is generated by combustion of fuel in the combustion chamber (10); A metal pipe (20) passing through the fire portion (11) of the combustion chamber (10); It includes water (21) supplied inside the metal pipe (20),

The water inside the metal pipe 20 undergoes a phase change into steam 22 at the high-temperature hot area 11, and after the water inside the metal pipe 20 is converted into steam 22, the steam (22) is characterized in that it is put into a fire.

The combined cycle power plant according to the present invention includes a combustion chamber (10) that burns fuel; A fire area (11), which is a space where heat energy is generated by combustion of fuel in the combustion chamber (10); A metal pipe (20) passing through the fire portion (11) of the combustion chamber (10); It includes steam (22) supplied inside the metal pipe (20),

The steam 22 supplied inside the metal pipe 20 is converted into high-temperature steam 23 at the high-temperature hot area 11, and the high-temperature steam 23 is injected into the hot area. Do it as

The metal pipe 20 is installed in the hot area 11 and is coiled so that water 21 or steam 22 passing through the metal pipe 20 can change phase into high-temperature steam 23. It is characterized by being formed.

The metal pipe 20 is installed in the hot area 11 and is formed in a spiral shape so that water 21 or steam 22 passing through the metal pipe 20 can change phase into high temperature steam 23. It is characterized by being

The metal pipe 20 is installed in the hot area 11 and has a zig-zag type so that water 21 or steam 22 passing through the metal pipe 20 can change phase into high temperature steam 23. It is characterized by being formed.

As described above, the combined cycle power plant according to the present invention passes water through a spiral-shaped, coil-shaped, or zigzag-shaped metal pipe installed at a hot area, and allows the water flowing inside the metal pipe to pass through a high-temperature hot area. In this way, the water inside the metal pipe passing through the hot area undergoes a phase change into steam. The water passing through the metal pipe is converted into steam at the high temperature hot area, and then the high temperature of the hot area is sprayed by the spray device. By injecting steam to supply oxygen necessary for combustion of fuel at the fire site, the effect of sufficiently supplying oxygen necessary for combustion of fuel in the combustion chamber of the combined cycle power plant is obtained.

Therefore, sufficient oxygen supply to the combustion chamber where the fuel is burned leads to complete combustion of the fuel, which increases the combustion efficiency of the fuel, which increases the thermal efficiency of the combined cycle power plant, resulting in economic benefits through fuel savings.

In addition, sufficient oxygen required for the combustion chamber of the combined cycle power plant is supplied, thereby increasing the combustion power of the fuel, and thus higher temperature steam can be quickly created, which has the effect of improving the output of the combined cycle power plant. .

In addition, sufficient oxygen supplied in the combustion chamber of a combined cycle power plant allows complete combustion of fuel, thereby reducing carbon dioxide emissions generated from fuel combustion, thereby reducing environmental pollution.

1 is a schematic diagram of a combined cycle power plant according to a first preferred embodiment of the present invention;
Figure 2 is a schematic diagram of a combined cycle power plant according to a second preferred embodiment of the present invention;
Figure 3 is a three-dimensional view showing the shape of a coiled metal pipe of a combined cycle power plant according to the first and second preferred embodiments of the present invention;
Figure 4 is a front view showing the shape of a spiral metal pipe of a combined cycle power plant according to the first and second preferred embodiments of the present invention;
Figure 5 is a front view showing the shape of a zigzag metal pipe of a combined cycle power plant according to the first and second preferred embodiments of the present invention;

Hereinafter, a combined cycle power plant according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

<First embodiment>

1 is a schematic diagram of a combined cycle power generation device according to a first preferred embodiment of the present invention.

As shown in FIG. 1, the combined cycle power plant according to a preferred embodiment of the present invention includes a combustion chamber 10 for burning fuel, and a combustion area (a space where heat energy is generated by combustion of fuel in the combustion chamber 10). 11), a metal pipe 20 passing through the fire portion 11 of the combustion chamber 10, and water 21 supplied inside the metal pipe 20,

The water inside the metal pipe 20 undergoes a phase change into steam 22 at the high-temperature hot area 11, and after the water inside the metal pipe 20 is converted into steam 22, the steam (22) is put into the fire.

In this combined cycle power plant, a metal pipe 20 is placed in the combustion area 11 of the combustion chamber 10, and water 21 flows into the metal pipe 20. The water 21 flowing into the metal pipe 20 is converted into high-temperature steam 23 and then is configured with a spray device 24 that sprays the high-temperature steam 23 onto the hot area 11.

As shown in FIG. 1, in the combined cycle power generation device according to the first embodiment of the present invention, a metal pipe 20 is disposed at the fire portion 11 of the combustion chamber 10.

Water 21 flows into the metal pipe 20.

The water 21 flowing into the metal pipe 20 undergoes a phase change into steam 22 due to the high temperature of the combustion chamber 10.

The steam 22 converted from water 21 within the metal pipe 20 is heated again to a high temperature, and the high temperature steam 23 heated again to a high temperature is injected into the combustion chamber 10 by the injection device 24. It is sprayed onto the hot area (11).

The metal pipe 20 is formed in one of a coil shape, a spiral shape, and a zigzag shape depending on its shape.

Figure 3 illustrates a three-dimensional view of a coil-shaped metal pipe, Figure 4 illustrates a front view of a spiral-shaped metal pipe, and Figure 5 illustrates a front view of a zigzag-shaped metal pipe.

As shown in FIG. 3, the metal pipe 20 is installed at the hot area 11 so that water 21 or steam 22 passing through the metal pipe 20 is converted into high-temperature steam 23. It is formed in a coil shape so that changes can occur.

As shown in FIG. 4, the metal pipe 20 is installed at the hot area 11 so that water 21 or steam 22 passing through the metal pipe 20 is converted into high-temperature steam 23. It is formed in a spiral so that change can occur.

As shown in FIG. 5, the metal pipe 20 is installed at the hot area 11 so that water 21 or steam 22 passing through the metal pipe 20 is converted into high-temperature steam 23. It is formed in a zigzag shape so that changes can occur.

The metal pipe 20 disposed in the fire area 11 of the combustion chamber 10 of the combined cycle power plant is configured in a coil shape, spiral shape, or zigzag shape for the purpose of effective heat transfer in the fire area 11 of the combustion chamber 10. It is also possible to manufacture it in another shape.

As described above, the high-temperature steam 23 sprayed onto the hot area 11 by the injection device 24 is composed of oxygen and hydrogen molecules, and when it is sprayed onto the hot area 11 at a high temperature, the high temperature steam 23 is sprayed onto the hot area 11 by the injection device 24. Oxygen contained in the steam 23 is supplied to the combustion part 11 of the combustion chamber 10 to supply oxygen necessary for combustion of fuel.

In the combined cycle power plant according to the first embodiment of the present invention, water (21) passing inside the metal pipe (20) passes through the hot area (11) of the high-temperature combustion chamber (10) and is converted into high-temperature steam (23). It gets converted.

The high-temperature steam 23 converted within the metal pipe 20 is injected into the combustion area 11 of the combustion chamber 10 to additionally supply oxygen necessary for combustion of the fuel, thereby achieving complete combustion of the fuel. The combustion efficiency of the fuel increases, and the combustion power of the fuel becomes more powerful.

In addition, the supply of sufficient oxygen allows complete combustion of the fuel and reduces the amount of carbon dioxide generated by combustion of the fuel.

<Second Embodiment>

Figure 2 is a schematic diagram of a combined cycle power generation device according to a second preferred embodiment of the present invention.

The combined cycle power plant according to the second preferred embodiment of the present invention includes a combustion chamber 10 for burning fuel, a combustion area 11, which is a space where heat energy is generated by combustion of fuel in the combustion chamber 10, and the combustion chamber ( It includes a metal pipe (20) passing through the hot area (11) of 10) and steam (22) supplied inside the metal pipe (20),

The steam 22 supplied inside the metal pipe 20 is converted into high-temperature steam 23 at the high-temperature hot area 11, and the high-temperature steam 23 is injected into the hot area.

A metal pipe 20 is disposed in the combustion area 11 of the combustion chamber 10, and steam 22 recovered from the steam generator of the combined cycle power plant flows into the metal pipe 20.

It is supplied into the metal pipe 20 and consists of an injection device 24 that injects high-temperature steam 23, which is heated by the high temperature of the hot area 11 of the combustion chamber 10, to the hot area 11.

As shown in FIG. 2, in the combined cycle power generation device according to the second embodiment of the present invention, a metal pipe 20 is disposed at the fire portion 11 of the combustion chamber 10.

Steam 22 flows into the metal pipe 20.

The steam 22 flowing into the metal pipe 20 is changed into high-temperature steam 23 by the high temperature of the combustion chamber 11.

High-temperature steam 23 heated to a high temperature within the metal pipe 20 is injected into the hot area 11 of the combustion chamber 10 by an injection device 24.

The metal pipe 20 disposed in the combustion area 11 of the combustion chamber 10 is classified into a coil type, a spiral shape, and a zigzag shape depending on its shape, and other shapes are also possible.

FIG. 3 illustrates a front view of a coil-shaped metal pipe 20, FIG. 4 illustrates a front view of a spiral-shaped metal pipe 20, and FIG. 5 illustrates a front view of a zigzag-shaped metal pipe 20.

The metal pipe 20 disposed in the fire area 11 of the combustion chamber 10 of the combined cycle power plant is configured in a coil shape, spiral shape, or zigzag shape to increase the heat transfer rate in the fire area 11 of the combustion chamber 10. It is also possible to manufacture it in another shape.

As described above, high-temperature steam 23 converted to high temperature inside the metal pipe 20 disposed in the combustion area 11 of the combustion chamber 10 is injected by the injection device 24.

The high-temperature steam (23) injected by the injection device (24) is composed of oxygen and hydrogen molecules. When it is sprayed at the hot area (11) at a high temperature, the oxygen contained in the high-temperature steam (23) is transferred to the combustion chamber (10). ) is supplied to the combustion part 11 to supply the oxygen necessary for combustion of fuel.

In the combined cycle power plant according to the second embodiment of the present invention, high-temperature steam (23) passing through the inside of the metal pipe (20) passes through the hot area (11) of the high-temperature combustion chamber (10) and generates high-temperature steam (23). The high-temperature steam 23 converted within the metal pipe 20 is injected into the combustion area 11 of the combustion chamber 10 to sufficiently supply oxygen necessary for combustion of the fuel, thereby achieving complete combustion of the fuel. As a result, the combustion efficiency of the fuel increases, and the combustion power of the fuel becomes more powerful.

In addition, with sufficient oxygen supplied, the fuel can be completely burned and the amount of carbon dioxide generated by fuel combustion can be reduced.

The combined cycle power plant according to this embodiment of the present invention installs a metal pipe (20) in the combustion part (11) of the combustion chamber (10) to allow water (21) or steam (22) to flow into the metal pipe (20). By injecting and causing the water to flow, the water 21 that flows into the metal pipe 20 due to the high heat of the fire area 11 of the combustion chamber 10 flows from the steam 22 back to the high temperature steam 23 and into the metal pipe 20. ) The water 21 flowing inside is converted into high-temperature steam 23 and is injected into the hot area 11 of the combustion chamber 10 by the injection device 24.

In addition, the combined cycle power generation device according to the present invention configures the metal pipe (20) in a coiled, spiral, or zigzag shape so that high heat generated by combustion of fuel in the combustion chamber (10) is effectively transferred to the metal pipe (20).

In addition, the combined cycle power generation device according to the present invention converts the water (21) or steam (22) inside the metal pipe (20) passing through the fire portion (11) of the combustion chamber (10) into high-temperature steam (23) in the combustion chamber (10). By injecting it into the fire area 11 of the combustion chamber 10, the oxygen contained in the steam 22 is sufficiently supplied to combust the fuel in the combustion chamber 10.

In addition, the combined cycle power plant according to the present invention injects high-temperature steam (23) into the combustion area (11) of the combustion chamber (10) so that the oxygen contained in the high-temperature steam (23) can supply the oxygen necessary for combustion of fuel. By doing so, the fuel burned in the combustion chamber 10 is completely burned. Sufficient oxygen supply to the combustion chamber 10 increases the combustion power of the fuel, which has the effect of reducing economic costs by improving thermal efficiency, and can also reduce carbon dioxide emissions generated from the combustion of fuel, thereby protecting the environment.

Although the invention made by the present inventor has been described in detail according to the above-mentioned embodiments, the present invention is not limited to the above-described embodiments and can of course be changed in various ways without departing from the gist of the invention.

10: Combustion chamber 11: Fire area
20: metal pipe 21: water
22: steam 23: high temperature steam
24: Injection device

Claims (5)

A combustion chamber (10) that burns fuel;
A fire area (11), which is a space where heat energy is generated by combustion of fuel in the combustion chamber (10);
When the water flowing inside passes through the fire part 11, a phase change occurs due to the high temperature fire generated in the fire part 11, thereby converting it into high temperature steam consisting of oxygen and hydrogen molecules (metal pipe 20) ); and
It includes a spray device (24) that sprays the converted high-temperature steam to the hot area (11),
The metal pipe 20 has a coiled or zigzag shaped shape,
The high-temperature steam injected into the hot area 11 by the injection device 24 is composed of oxygen and hydrogen molecules, and the oxygen is supplied to the hot area 11 to supply oxygen necessary for combustion of fuel. A combined cycle power plant characterized in that. delete delete delete delete

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