KR101713596B1 - Power generation device using waste heat - Google Patents

Abstract

A waste heat generator according to an embodiment of the present invention includes: a wall part providing an internal space connected to the outside so that external air can flow in and out; A waste heat supply unit disposed at a lower portion of the wall unit to supply heat to the internal space; And the outer air generated by the heat provided by the waste heat supply unit passes through the inner space due to the difference in density between the inner space and the outer space, And a generator for generating electricity by providing a rotational force.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a waste heat generator, and more particularly, to a waste heat generator for improving efficiency and economy in recovering waste heat.

Generally, in the power generation system using waste heat, the waste heat of 150 ° C to 170 ° C is converted into hot water of 130 ° C through heat exchange and supplied to the heat source of the organic Rankine cycle system by using the hot water.

The organic Rankine cycle system uses Freon-based R-123 as a working fluid, which is evaporated by heat exchange with water of middle and low temperature through the preheater and the evaporator.

At this time, the working fluid passes through the turbine in a high-temperature and high-pressure steam state and produces electric power in the process of passing through the turbine. After the working fluid becomes a low-temperature and low-pressure steam state, the working fluid is changed into a liquid state through the condenser.

As described above, a low-boiling working fluid is used to produce electric power by using waste heat, and up to now, the Freon system has been mostly used.

However, the Freon series has recently been restricted due to environmental problems, and the waste heat generation system described above has a low efficiency, so it is very difficult to actually apply the recovery system to the initial investment cost of about 9 years.

Therefore, there is an urgent need to study the waste heat from various industrial facilities efficiently and economically.

An object of the present invention is to provide an apparatus for using waste heat to efficiently generate electricity using heat discharged from various industrial facilities.

A waste heat generator according to an embodiment of the present invention includes: a wall part providing an internal space connected to the outside so that external air can flow in and out; A waste heat supply unit disposed at a lower portion of the wall unit to supply heat to the internal space; And the outer air generated by the heat provided by the waste heat supply unit passes through the inner space due to the difference in density between the inner space and the outer space, And a generator for generating electricity by providing a rotational force.

The waste heat generator according to an embodiment of the present invention may further include a heat exchange unit disposed between the internal space and the waste heat supply unit to store and deliver the heat provided by the waste heat supply unit to the internal space.

The heat exchanger of the waste heat generator according to an embodiment of the present invention may include water or a phase change material therein.

The wall portion of the waste heat generator according to an embodiment of the present invention includes a first wall portion formed to extend outward from the external air introduced into the internal space and extending upwardly and a second wall portion extending from the end portion of the first wall portion in a radial direction And a second wall portion extending outwardly and allowing outside air to flow from the periphery.

The second wall portion of the waste heat generator according to an embodiment of the present invention may be made of a transparent glass through which the solar radiation heat is transmitted to provide heat to the inner space by solar radiation heat.

The waste heat generator according to an embodiment of the present invention may further include a collecting unit disposed between the inner space and the waste heat supply unit to collect the solar radiation heat to apply rotational force to the impeller.

The waste heat generator according to the present invention can produce high efficiency electricity using waste heat, can be simple in construction, and can minimize maintenance cost.

In addition, damage caused by corrosion can be prevented and durability can be maximized.

1 is a schematic sectional view showing a waste heat generator according to an embodiment of the present invention;
2 and 3 are schematic cross-sectional views illustrating an operation sequence of a waste heat generator according to an embodiment of the present invention;

Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventive concept. Other embodiments falling within the scope of the inventive concept may readily be suggested, but are also considered to be within the scope of the present invention.

The same reference numerals are used to designate the same components in the same reference numerals in the drawings of the embodiments.

1 is a schematic sectional view showing a waste heat generator according to an embodiment of the present invention.

1, a waste heat generator 100 according to an embodiment of the present invention includes a wall 110 for providing a predetermined internal space 115, a waste heat supply unit 120, and a generator 130 for generating electricity. . ≪ / RTI >

1, the axial direction refers to the vertical direction with respect to the waste heat supply part 120, and the radially outer or inner direction refers to the outer end or center of the waste heat supply part 120, Direction.

The wall part 100 may provide an external appearance of the waste heat generator 100 according to an embodiment of the present invention, and the upper and lower sides may be connected to the outside so that external air can flow in and out.

The wall portion 100 may include a first wall portion 110a extending upward in the axial direction so as to allow the outside air introduced into the internal space 115 to flow out to the outside, And a second wall portion 110b extending radially outward from an end of the wall portion 110a.

The first wall portion 110a may be formed to have a height H with a relatively smaller inner diameter than the second wall portion 110b and may be formed to have a height H in order to generate a pressure for air flow, 3 will be described later in detail.

The second wall portion 110b can receive outside air from the outside and can be formed broader for a larger amount of air inflow.

Here, the second wall portion 110b may be made of a transparent glass through which the solar radiation heat 160 (see FIG. 2) is transmitted to provide heat to the internal space 115 by the solar radiation heat 160, May be a material having a high transmittance to the substrate.

Therefore, the solar radiation heat 160 can be a source for causing the flow of outside air together with the waste heat supply part 120 to be described later.

The waste heat supply part 120 is a component for providing heat to a predetermined internal space 110 formed by the wall part 110 and may be waste heat discharged from various industrial facilities.

The waste heat 125 supplied by the waste heat supply unit 120 may be in a range of 200 to 300 ° C. and the waste heat 125 may be stored in the heat exchanging unit 150 having a radius R, To the inner space 115.

The heat exchanging unit 150 may be disposed between the inner space 115 and the middle / low-temperature waste heat supplying unit 120 as a component for transferring the waste heat 125 to the inner space 115 as described above .

The water or the phase change material may store heat and may provide a stable heat source to the inner space 115 without any time dependency on the heat or the phase change material. .

A heat collecting part 140 having a radius R of the same radius may be provided on the heat exchanging part 150. The heat collecting part 140 passes through the second wall part 110b made of the transparent glass mentioned above And the air in the internal space 115 can be heated.

The solar radiation heat 160 can compensate the amount of heat supplied by the low-middle-temperature waste heat supply unit 120, and can maximize the efficiency of the low-temperature on-site cogeneration system 100 according to an embodiment of the present invention.

However, the heat exchanging unit 150 and the heat collecting unit 140 may have a circular plate shape having a radius R, but the present invention is not limited thereto and may be variously changed according to the designer's intention.

The generator 130 may include the impeller 135 as an element disposed in the internal space 115 and converting the waste heat 125 provided by the waste heat supply unit 120 into electricity.

The impeller 135 can generate electricity by driving the generator 130 by the rotational force of the impeller 135 by means of rotating air by the air flowing in the internal space 115.

2 and 3 are schematic cross-sectional views illustrating an operation sequence of a waste heat generator according to an embodiment of the present invention.

Referring to FIG. 2, the waste heat supply unit 120 may supply the waste heat 125 to the internal space 115 inside the wall unit 110.

The waste heat 125 heats the heat exchanging unit 150 formed in contact with the lower part of the heat collecting unit 140.

That is, the waste heat 125 applies heat to the water or the phase change material provided in the heat exchange unit 150, and the water or the phase change material stores the heat.

The heat stored in the heat exchanging part 150 continuously supplies heat to the heat collecting part 140 to supply heat to the internal space 115 and the heat is generated by the heat of the heat collecting part 140, 115).

The solar radiation heat 160 and the waste heat 125 may collect the solar radiation 160 transmitted through the second wall 110b and heat the interior space 115 .

The flow of air in the internal space 115 will now be described.

When the internal space 115 is heated by at least one of the waste heat 125 and the solar radiation heat 160, a difference in density is formed between the external air and the heated air in the internal space 115.

That is, a pressure difference is instantaneously generated between the point P 1 on the outer inlet side and the point P 2 on the inner space 115.

Accordingly, external air flows into the internal space 115 from the point P1 on the external inlet side, buoyancy due to the density difference is generated by the height H of the first wall portion 110a, .

This can be expressed by the following equations (1) and (2).

Pressure at P1 = ρ ₀ * g * h (1)

Pressure at P2 = ρ * g * h (2)

Here, the symbol character ignores the viscous loss due to the air flow in the internal space 115, and g is the gravitational acceleration under the assumption that the flow is in a steady state, and ρ ₀ is the density (specific gravity) of the air at the external P2 point , p is the density of the heated air at the point P2 in the inner space 115 and H is the height of the wall portion 110. [

)가 발생될 수 있으며, 이는 공기의 운동에너지를 유발시켜 상기 벽부(110)를 통과하는 공기의 유동이 일어날 수 있다.
Therefore, a pressure difference (? _{0 -} ?) Corresponding to (? _{0 -} ?) * G * h

Which may induce kinetic energy of the air, thereby causing air to flow through the wall 110.

3, a flow 170 of air generated by a pressure difference corresponding to (rho _{0 -} rho) * g * h between points P1 and P2 is formed by an impeller 135 And the generator 130 is driven by the rotation of the impeller 135 to generate electricity.

일 수 있다.Theoretically, the maximum output (P _max )

Lt; / RTI >

는 공기의 질량유속 (kg/s)이고, ρ₀와 ρ 각각 P1지점 및 P2지점의 공기밀도 (kg/m³)이며,

는 압력차 (Pa)이고,

는 공기의 비열이며 (J/KgK),

는 투입열유속 (W/m²)이다.
here,

Is the mass flow rate of the air (kg / s), and ρ ₀ and (kg / m < ³ >) at points P1 and P2, respectively,

Is the pressure difference Pa,

Is the specific heat of the air (J / KgK),

Is the input heat flux (W / m ² ).

Generally, the amount of power generated by the rotation of the impeller 135 of the generator 130 is low due to a small amount of power generated by difference in solar radiant energy of each day, night, and season when only the solar radiation 160 is used, .

However, according to the waste heat generator 100 according to the embodiment of the present invention, since the waste heat 125 of the mid-low temperature of the industrial site can be used simultaneously with the solar radiation heat 160, can do.

Also, in this case, the size of the second wall portion 110b, which is a transparent glass having a high transmittance, can be remarkably reduced in order to increase the amount of heat accumulated.

According to the above embodiments, electricity can be produced using the density difference of air in the power generation using the waste heat, so that the configuration of the power generation device is simple and the maintenance cost can be minimized.

In addition, since the solar radiation heat 160 together with the waste heat 125 forms a density difference of air, high efficiency electricity can be produced.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be apparent to those skilled in the art that changes or modifications may fall within the scope of the appended claims.

100: waste heat generator 110: wall part
110a: first wall portion 110b: second wall portion
120: waste heat supply part 125: waste heat
130: generator 135: impeller
140: collecting part 150: heat exchanging part
160: solar radiation 170: air flow

Claims (6)

A wall portion providing an inner space connected to the outside so that outside air can flow in and out;
A waste heat supply unit arranged at a predetermined distance from the lower part of the wall part to supply heat to the inner space;
The outside air is passed through the internal space due to the difference in density between the inside space and the outside generated by the heat provided by the waste heat supply unit and the impeller is rotated by the flow of the air, A generator for generating electricity; And
A heat exchange unit disposed between the inner space and the waste heat supply unit and having water or a phase change material therein to store and deliver the heat provided by the waste heat supply unit to the inner space;
And a waste heat source.
delete delete The method according to claim 1,
Wherein the wall portion includes a first wall portion extending upward from the external air introduced into the internal space and a second wall portion extending radially outward from the end portion of the first wall portion, And a second wall portion for allowing the first wall portion and the second wall portion to communicate with each other.
5. The method of claim 4,
Wherein the second wall portion is made of transparent glass through which the solar radiation heat is transmitted to provide heat to the inner space by solar radiation heat.
6. The method of claim 5,
And a collecting unit disposed between the inner space and the waste heat supply unit to collect the solar radiation heat to apply rotational force to the impeller.

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