KR102536163B1 - Waste heat recovery apparatus for a boiler of a laundry - Google Patents

Abstract

The present invention relates to a waste heat recovery device for a boiler in a laundry that recovers the heat of high-temperature gas as well as the heat of high-temperature condensate discharged from a steam-using device, and the waste heat recovery device includes a main tank ( 10), an auxiliary tank 20 provided on one side of the main tank 10 and storing water, and a water supply pipe 30 connected between the main tank 10 and the boiler B of the laundry, A steam discharge pipe 40 connected between the boiler B and the main tank 10, a steam separation pipe 50 connected to the steam discharge pipe 40 and provided inside the main tank 10, An air discharge pipe 60 connected between the upper end of the main tank 10 and the auxiliary tank 20, and a water filling pipe 70 connected between the auxiliary tank 20 and the main tank 10, An air injection pipe 80 connected to the air discharge pipe 60, a controller 90 provided outside the main tank 10, and a vertical collection pipe 100 connected to the vapor discharge pipe 40 , It includes an overflow pipe 110 connected to the main tank 10 and a drain pipe 120 connected to the lower end of the main tank 10.

Description

Waste heat recovery device for a boiler in a laundry {WASTE HEAT RECOVERY APPARATUS FOR A BOILER OF A LAUNDRY}

The present invention relates to a waste heat recovery device for a boiler in a laundry, and more particularly, to a waste heat recovery device for a boiler in a laundry that can recover the heat of high-temperature gas together with the heat of high-temperature condensate discharged from a steam-using device. it's about

In general, laundromats are equipped with steam-using devices such as clothes dryers, irons, and presses that are used to dry or iron various types of clothes. Such steam-using devices are supplied with steam and used for drying or ironing.

Such steam is supplied by a boiler installed in the laundry, and the boiler heats water to generate high-temperature steam and supplies the generated steam.

The high-temperature steam produced by the boiler is immediately discharged through the atmosphere after being used in steam-using equipment, or is condensed and discarded to the outside.

In order to recover the wasted waste heat, a waste heat recovery device is connected to the boiler and used.

However, the prior art as described above has the following problems.

Conventional waste heat recovery devices have only a function of recovering heat from high-temperature condensate discharged from a steam using device connected to a boiler, and thus have a problem in that waste heat recovery efficiency is very low.

Registered Patent No. 0799753 "Waste Heat Recovery System for Steam Boiler" (2008.01.24.)

Accordingly, the present invention was made to solve the above conventional problems,

An object of the present invention is to provide a waste heat recovery device for a boiler of a laundry that can recover heat of high-temperature gas together with heat of high-temperature condensate discharged from a steam-using device.

In order to achieve the above object, a "waste heat recovery device for a boiler in a laundry" according to the present invention includes a main tank in which water is stored and a plurality of water level sensors are installed at the top; an auxiliary tank installed on one side of the main tank, connected to a water pipe to supply water, and storing water therein; a water supply pipe connected between the main tank and the boiler of the laundry, having a first on-off valve and a first check valve installed on the duct, and supplying water from the main tank to the boiler; a steam discharge pipe connected between the main tank and the steam using device, having a second on-off valve and a second check valve installed on the duct, and discharging steam and water discharged from the steam using device to the main tank; It is provided vertically inside the main tank, the steam discharge pipe is connected horizontally to one side of the upper end, an air outlet is formed at the upper end, and a bent discharge port is formed by bending the lower end, and the high-temperature Air is discharged to the inner upper part of the main tank through the air outlet, and the high-temperature water flowing in through the steam discharge pipe is discharged obliquely to the inner lower part of the main tank through the bent outlet, forming a vortex while storing water and A water separation vertical pipe for mixing and recovering waste heat; It is connected between the upper end of the main tank and the lower end of the auxiliary tank, a third on-off valve is installed on the pipe line, and the high-temperature air collected in the inner upper part of the main tank is supplied to the auxiliary tank and exchanges heat with stored water. an air discharge pipe for recovering waste heat while being discharged; It is connected between the lower end of the auxiliary tank and one upper side of the main tank, a water pump and a third check valve are installed on the pipe line, and supplies water in the auxiliary tank to the main tank by driving the water pump. filling tube; It is characterized by including.

In addition, the "waste heat recovery device for a laundry boiler" according to the present invention is connected to the duct of the air discharge pipe, a fourth on-off valve and a fourth check valve are installed on the duct, and external air is passed through the air discharge pipe. an air injection pipe that can be injected into the main tank; It is connected to various on-off valves including the first on-off valve, a water level sensor, a water pump, and a boiler, and controls the operation of the on-off valve and the water pump according to a water supply signal from the boiler to supply water in the main tank to the boiler. a controller that supplies to; It further includes, and the water separation vertical pipe is characterized in that it further includes a water silencer installed in a plurality on the pipe to discharge water in a state in which noise is blocked.

In addition, the auxiliary tank of the "waste heat recovery apparatus for a boiler in a laundry" according to the present invention has one end connected to the upper end of the air discharge pipe and provided in a spiral shape inside the auxiliary tank to the inside of the auxiliary tank. A spiral tube that exchanges heat with stored water, a bent tube that is bent vertically from the upper end of the spiral tube upward, then horizontally, and then bent vertically downward again, and is installed at the lower end of the bent tube to reduce noise. A lower silencer for discharging air in a blocked state, a pair of horizontal silencers connected in communication from the horizontal portion of the bent pipe to the lower portion and discharging air in a noise-blocking state, installed in the water pipe and in the auxiliary tank It is characterized in that it further comprises an opening and closing device for opening and closing the water pipe to maintain a constant water level in the inside, and a communication port installed in communication with the outside at the top of the auxiliary tank.

In addition, the "waste heat recovery device for a boiler in a laundry" according to the present invention is vertically connected to the conduit of the steam discharge pipe, a fifth on-off valve is installed on the conduit, and the water contained in the water discharged through the steam discharge pipe a vertical collection tube for collecting foreign substances; To the inside of the main tank, one end is connected to one side of the main tank corresponding to the highest water level, the other end is provided to the lower part of the main tank, a sixth on-off valve is installed on the pipe line, and to the inside of the main tank an overflow pipe for discharging water overflowing higher than the highest water level to the outside; A drain pipe having an upper end connected to the lower end of the main tank, a lower end connected to the overflow pipe, a seventh opening/closing valve installed on the pipe, and capable of discharging water and foreign matter inside the main tank to the outside. second; It is characterized by further including.

As described above, the present invention can recover the heat of the high-temperature gas together with the heat of the high-temperature condensate discharged from the steam-using device, thereby minimizing the waste of waste heat and saving electricity for heating, It has the effect of significantly reducing operating costs.

1 is a schematic longitudinal sectional view of a waste heat recovery device according to the present invention;
2 is a schematic longitudinal cross-sectional view showing a waste heat recovery state of the waste heat recovery device according to the present invention;
Figure 3 is a schematic longitudinal cross-sectional view showing a water supply state of the waste heat recovery device according to the present invention.

Hereinafter, a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings shown. However, it should be understood that this invention may be embodied in many different forms and is not limited to the described embodiments.

1 to 3 are schematic views of a waste heat recovery device according to the present invention. As shown therein, the waste heat recovery apparatus for a boiler of a laundry according to the present invention includes a main tank 10 for storing water, an auxiliary tank 20 provided on one side of the main tank 10 and storing water, and The water supply pipe 30 connected between the main tank 10 and the boiler B of the laundry, the steam discharge pipe 40 connected between the boiler B and the main tank 10, and the steam discharge pipe (40) and the air separation pipe 50 provided inside the main tank 10, and the air discharge pipe 60 connected between the upper end of the main tank 10 and the auxiliary tank 20, , The water filling pipe 70 connected between the auxiliary tank 20 and the main tank 10, the air injection pipe 80 connected to the air discharge pipe 60, and the outer side of the main tank 10 of the controller 90, the vertical collection pipe 100 connected to the steam discharge pipe 40, the overflow pipe 110 connected to the main tank 10, and the main tank 10 It includes a drain pipe 120 connected to the lower end.

Water is stored in the main tank 10 and a plurality of water level sensors 11 are installed at the top, and waste heat can be recovered while the stored water and the high-temperature water discharged from the steam using device A are mixed. is to allow

The water level sensor 11 detects the water level inside the main tank 10 and transmits the detected information to the controller 90 . In this way, by detecting the water level of the main tank 10, when the water in the main tank 10 is emptied, the controller 90 performs an operation of automatically filling the water.

Here, the steam using device (A) refers to an iron, a press, a dryer, etc. that are connected to a boiler (B) of a laundry and use steam.

The auxiliary tank 20 is installed on one side of the main tank 10, the water pipe 21 is connected to supply water, and water is stored therein, and serves to supply water to the main tank 10. While doing so, it is possible to recover waste heat discharged from the high-temperature air discharged from the steam using device (A). The water pipe 21 refers to a pipe through which tap water is supplied.

In this way, by recovering all of the waste heat contained in the hot water and hot air discharged from the steam using device A, the waste heat recovery efficiency is relatively increased (see FIG. 2 ).

The auxiliary tank 20 as described above has one end connected to the upper end of the air discharge pipe 60 and is spirally provided inside the auxiliary tank 20 to store water and A spiral tube 22 in which heat exchange is performed, a bent tube 23 that is bent vertically from the upper end of the spiral tube 22 toward the top, then bent horizontally, and then bent vertically toward the bottom again, the bent tube ( 23) and a lower silencer 24 installed at the lower end to discharge air while blocking noise, and a lower silencer 24 connected in communication from the horizontal part of the bent pipe 23 to the lower portion to discharge air while blocking noise A pair of horizontal silencers 25, an opener 26 installed in the water pipe 21 and opening and closing the water pipe 21 to maintain a constant water level inside the auxiliary tank 20, and the auxiliary tank ( 20) further includes a communication port 27 installed in communication with the outside at the top.

The spiral pipe 22 is for heat exchange between the high-temperature air flowing through the air discharge pipe 60 and the water inside the auxiliary tank 20, and the bent pipe 23 is the spiral pipe The air passing through (22) is guided back into the water stored in the auxiliary tank (20) so that it can be discharged.

The lower silencer 24 and the horizontal silencer 25 are formed with a plurality of fine holes, so that the air guiding the bent pipe 23 can be discharged in a noise-preventing state, and the opener 26 ) Is a known thing that allows water to be supplied through the water pipe 21 while maintaining a constant water level inside the auxiliary tank 20, and the communication port 27 is directed to the inside of the auxiliary tank 20. It plays the role of releasing the pressure by communicating the discharged high-pressure air to the outside.

The water supply pipe 30 is connected between the main tank 10 and the boiler B of the laundry, and a first on-off valve 31 and a first check valve 32 are installed on the pipe, and the main tank It serves to provide a passage for supplying the water of (10) to the boiler (B) (see FIG. 3). As such, waste heat is recovered from the main tank 10 and heated water is supplied to the boiler (B), thereby significantly improving the thermal efficiency of the boiler (B).

The first opening/closing valve 31 is to open and close the water supply pipe 30, and the first check valve 32 is known to prevent reverse flow through the water supply pipe 30.

The steam discharge pipe 40 is connected between the main tank 10 and the steam using device A, and a second open/close valve 41 and a second check valve 42 are installed on the pipe, and the steam is used. It serves to discharge steam and water discharged from the device (A) to the main tank (10).

The second opening/closing valve 41 is to open and close the steam discharge pipe 40, and the second check valve 42 is known to prevent reverse flow through the steam discharge pipe 40.

The steam separation vertical pipe 50 is provided vertically inside the main tank 10, the steam discharge pipe 40 is connected horizontally to one side of the upper end, an air outlet 51 is formed at the upper end, and the lower end is bent and bent. The discharge port 52 is formed, and the high-temperature air introduced through the steam discharge pipe 40 is discharged to the inner upper portion of the main tank 10 through the air discharge port 51, and the steam discharge pipe 40 The high-temperature water introduced through the bent discharge port 52 is discharged obliquely to the inner lower portion of the main tank 10, forms a vortex, and is mixed with stored water to recover waste heat (see FIG. 2).

The air outlet 51 is to separate the high-temperature air and collect it in the inner upper part of the main tank 10, and the bent outlet 52 is the high-temperature water passing through the water separation vertical pipe 50. As it is discharged to the lower part, it is rotated to form a vortex.

The water separation vertical pipe 50 as described above further includes a water silencer 53 installed in plurality on the pipe. The water silencer 53 serves to discharge water in a state in which a plurality of fine holes are formed to block noise.

The air discharge pipe 60 is connected between the upper end of the main tank 10 and the lower end of the auxiliary tank 20, and a third on-off valve 61 is installed on the conduit. The high-temperature air collected on the inner upper part is supplied to the auxiliary tank 20 so that waste heat can be recovered while heat-exchanging with the stored water. The third open/close valve 61 is a known one that opens and closes the air discharge pipe 60 .

The water filling pipe 70 is connected between the lower end of the auxiliary tank 20 and the upper side of the main tank 10, and the water pump 71 and the third check valve 72 are installed on the pipe line. , It serves to drive the water pump 71 to supply and fill the water in the auxiliary tank 20 to the main tank 10 (see FIG. 3). The third check valve 72 is a known one that prevents a reverse flow of water through the water filling pipe 70 .

The air injection pipe 80 is connected to the pipe of the air discharge pipe 60, and a fourth on-off valve 81 and a fourth check valve 82 are installed on the pipe, and the heating of the main tank 10 When the water is supplied to the boiler (B), outside air is injected into the main tank (10) through the air discharge pipe (60) to relieve the internal pressure of the main tank (10) while the water is supplied to the boiler (B). This is to ensure smooth supply (see FIG. 3).

The fourth on-off valve 81 is to open and close the air injection pipe 80, and the fourth check valve 82 is a known one to prevent reverse flow through the air injection pipe 80. .

The controller 90 is connected to various on/off valves including the first on/off valve 31, the water level sensor 11, the water pump 71, and the boiler B, and supplies water to the boiler B. It serves to automatically supply water in the main tank 10 to the boiler B by controlling the operation of the on-off valve and the water pump 71 according to a signal.

The controller 90 is configured according to the path of the fluid according to the arrows shown in FIGS. 2 and 3, as in the case of recovering waste heat as shown in FIG. 2 and supplying water to the boiler B as shown in FIG. 3. It is controlled to open the on-off valve and close the remaining on-off valves.

The vertical collection pipe 100 is vertically connected to the conduit of the steam discharge pipe 40, and a fifth on-off valve 101 is installed on the conduit, and the water contained in the water discharged through the steam discharge pipe 40 It acts as a trap for debris. The fifth opening/closing valve 101 opens and closes the vertical collection pipe 100 to discharge the collected foreign substances to the outside.

The overflow pipe 110 is the inside of the main tank 10 and has one end connected to one side of the main tank 10 corresponding to the highest water level and the other end provided to the lower part of the main tank 10 and on the pipe line. The sixth opening/closing valve 111 is installed in the main tank 10, and serves to discharge water overflowing higher than the highest water level into the main tank 10 to the outside. The sixth open/close valve 111 is a known one capable of opening and closing the overflow pipe 110 .

The drain pipe 120 has an upper end connected to the lower end of the main tank 10, a lower end connected to the overflow pipe 110, and a seventh on-off valve 121 installed on the conduit, the main tank (10) to allow the water and foreign matter inside to be discharged to the outside. The seventh opening/closing valve 121 is a known one capable of opening and closing the drain pipe 120 .

Although preferred embodiments of the present invention have been described above, the present invention can use various changes, modifications, and equivalents. It is clear that the present invention can be equally applied by appropriately modifying the above embodiment. Therefore, the above description does not limit the scope of the present invention, which is defined by the limits of the following claims.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but it will be apparent to those skilled in the art that various modifications are possible without departing from the scope of the present invention.

10: main tank
11: water level sensor
20: auxiliary tank
21: water pipe 22: spiral pipe
23: bent pipe 24: lower silencer
25: horizontal silencer 26: switchgear
27: communication hole
30: water supply pipe
31: first on-off valve 32: first check valve
40: steam discharge pipe
41: second on-off valve 42: second check valve
50: water separation vertical pipe
51: air outlet 52: bent outlet
53: water silencer
60: air discharge pipe
61: third on-off valve
70: water filling pipe
71: water pump 72: third check valve
80: air injection pipe
81: 4th open/close valve 82: 4th check valve
90: controller
100: vertical collection pipe
101: fifth on-off valve
110: overflow pipe
111: 6th on-off valve
120: drain pipe
121: 7th on-off valve
B : Boiler
A: Devices using steam

Claims (4)

a main tank (10) in which water is stored and a plurality of water level sensors (11) are installed at the top;
An auxiliary tank 20 installed on one side of the main tank 10, connected to a water pipe 21 to supply water, and storing water therein;
It is connected between the main tank 10 and the boiler of the laundry, a first on-off valve 31 and a first check valve 32 are installed on the duct, and water in the main tank 10 is supplied to the boiler. A water supply pipe 30 to do;
It is connected between the main tank 10 and the steam using device, and a second opening/closing valve 41 and a second check valve 42 are installed on the pipe line, and the steam and water discharged from the steam using device are discharged from the main tank. a steam discharge pipe 40 for discharging to the tank 10;
It is provided vertically inside the main tank 10, the steam discharge pipe 40 is connected horizontally to one side of the upper end, an air outlet 51 is formed at the upper end, and the lower end is bent to form a bent discharge port 52. formed, the high-temperature air introduced through the steam discharge pipe 40 is discharged to the inner upper part of the main tank 10 through the air outlet 51, and the high-temperature air introduced through the steam discharge pipe 40 Water is discharged obliquely to the inner lower portion of the main tank 10 through the bent discharge port 52 and is mixed with stored water while forming a vortex to recover waste heat;
It is connected between the upper end of the main tank 10 and the lower end of the auxiliary tank 20, a third on-off valve 61 is installed on the pipe line, and the high temperature collected in the inner upper part of the main tank 10 an air discharge pipe (60) for recovering waste heat as air is supplied to the auxiliary tank (20) and exchanged with stored water;
It is connected between the lower end of the auxiliary tank 20 and the upper side of the main tank 10, and a water pump 71 and a third check valve 72 are installed on the pipe line, and the water pump 71 A water filling pipe 70 for driving and supplying water from the auxiliary tank 20 to the main tank 10; include,
The auxiliary tank 20,
One end is connected to the upper end of the air discharge pipe 60 into the auxiliary tank 20 and is spirally provided inside the auxiliary tank 20 to exchange heat with water stored in the auxiliary tank 20. A spiral tube 22,
A bent pipe 23 that is bent vertically from the upper end of the spiral pipe 22 toward the top, then bent horizontally, and then bent vertically toward the bottom again;
A lower silencer 24 installed at the lower end of the bent pipe 23 to discharge air while blocking noise;
A pair of horizontal silencers 25 connected in communication from the horizontal part of the bent pipe 23 to the lower part to discharge air while blocking noise;
An opener 26 installed in the water pipe 21 and opening and closing the water pipe 21 to maintain a constant water level inside the auxiliary tank 20;
Waste heat recovery device for a boiler in a laundry, characterized in that it further comprises a communication port (27) installed in communication with the outside at the top of the auxiliary tank (20).
According to claim 1,
The waste heat recovery device,
It is connected to the conduit of the air discharge pipe 60, a fourth on-off valve 81 and a fourth check valve 82 are installed on the conduit, and external air is supplied to the main tank 10 through the air discharge pipe 60. ) and an air injection pipe 80 that can be injected;
It is connected to various on-off valves including the first on-off valve 31, the water level sensor 11, the water pump 71 and the boiler, and the on-off valve and the water pump 71 are connected according to the water supply signal of the boiler. A controller 90 supplying water in the main tank 10 to the boiler by controlling driving; contain more,
The steam separation vertical pipe 50,
A waste heat recovery device for a boiler in a laundry, characterized in that it further comprises a plurality of water silencers (53) installed on the conduit to discharge water in a noise-blocking state.
delete According to claim 1,
The waste heat recovery device,
Vertical collection pipe ( 100) and;
One end is connected to one side of the main tank 10 corresponding to the highest water level into the main tank 10, the other end is provided to the lower part of the main tank 10, and a sixth on-off valve on the pipe ( 111) is installed, and an overflow pipe 110 for discharging water overflowing into the main tank 10 higher than the highest water level to the outside;
The upper end is connected to the lower end of the main tank 10, the lower end is connected to the overflow pipe 110, a seventh on-off valve 121 is installed on the pipe, and the inside of the main tank 10 A drain pipe 120 capable of discharging water and foreign substances to the outside;
Waste heat recovery device for a boiler in a laundry, characterized in that it further comprises.

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