KR20110070358A - Waste heat recycling system - Google Patents

Abstract

PURPOSE: A waste heat recovery system using filters is provided to save energy through heat recovery and prevent water pollution by lowering the temperature of discharged water. CONSTITUTION: A waste heat recovery system comprises filters which are formed in a hollow cylinder shape. Each filter(12) comprises a blocking plate(25) which has fine holes and is formed in the middle of the filter to divide the inside of the filter into upper and lower parts, a first inlet port(21) formed on the lower part, a second inlet port(23) and a first outlet port(22) which are formed on the upper part, and a second outlet port(24) formed on the bottom. The filters are stacked in multiple layers and located above or under the blocking plate according to the specific gravity.

Description

Waste heat recovery system using filter spheres {WASTE HEAT RECYCLING SYSTEM}

The present invention relates to a waste heat recovery system using unutilized energy.

The present invention relates to a waste heat recovery system using unutilized energy. The current trend of high energy consumption in Korea is continuing, and supply stability is weak due to the increase in consumption of high-grade energy such as oil and gas, which depends on imports. Increasing consumption of fossil fuels increases the emissions of air pollutants (CO ₂ , NOX, SOX), causing global warming and environmental degradation. It is time for hard work. The present invention is to increase the energy saving and environmental protection effect by utilizing the utility sewage waste heat usefully and conveniently.

Generally, the waste heat temperature of various bath facilities (sauna, hotel, clubhouse, factory, etc.) is drained to about 30 ~ 45 ℃. In recent years, waste heat is recovered by using a strainer and a coil heat exchanger that takes up a lot of space. Although it is used, there is an inconvenience of having to clean frequently because foreign matter gets stuck or clogged due to minute time and hair, etc., due to deterioration of efficiency. Therefore, by installing a filter to filter out fine dust, it is possible to use a heat exchanger which is smaller in size and more efficient, and needs a system that can be conveniently used while automatically removing dust from the filter.

Figure 1a is a system using a conventional boiler, Figure 1b is a view showing a system using a recovery facility. In FIG. 1a, the boiler receives water from the water supply tank, increases the temperature to 60 degrees Celsius, and distributes it where hot water is needed, and discards the waste heat of 30 degrees to 45 degrees Celsius without using it separately.

Figure 1b is a case equipped with a recovery facility is to collect the waste water from the waste heat tank to remove the foreign substances while going through the strainer. Strainers are commonly referred to as filters, and those used in boilers or recovery facilities are in the form of nets. By the way, wastewater usually contains a lot of foreign substances such as hair, so if you do not change the strainer frequently, it was easy to blockage, which was inconvenient. In Figure 1b, when the water enters the heat exchanger from the water supply tank, the heat exchanger receives the heat from the water supply from the waste water from the strainer. Boilers designed to be supplied with water at about 27 degrees Celsius have a lower thermal efficiency when water is supplied at lower temperatures. However, the conventional waste heat recovery facility is often difficult to use because it is easily clogged because it uses a network type of filter.

An object of the present invention is to eliminate the inconvenience that is received from a waste heat recovery system using a conventional filter by providing a filter of a newly configured form as devised to overcome the above disadvantages.

In order to achieve the above object, the present invention provides a waste heat recovery system, wherein the waste heat recovery system is a filter, and the filter has a hollow hollow cylindrical shape. The inner space of the filter is divided into the top and the bottom, and the first inlet is formed on the wall of the bottom, the second inlet and the first outlet are formed on the wall of the top, and the second outlet is formed on the bottom of the bottom.

Depending on the specific gravity of the filter sphere, at any one of the position on the blocking plate and the position below the blocking plate may include a filter, in which the manure sphere is stacked in a plurality of layers.

 The manure sphere is any one of the manure sphere has a specific gravity greater than the water and the manure has a smaller specific gravity than water and may be larger in diameter than the fine pores formed in the blocking plate.

The first inlet may be connected to a waste heat tank including waste water, and the first outlet may be connected to a heat exchanger.

The second inlet may be connected to the water supply tank.

The second inlet may be connected to any one or more of the blower and the washing tank for supplying the water supply tank and air.

The second outlet may be connected to the outlet of the wastewater from the heat exchanger, and the wastewater that has undergone the backwash mode may be introduced into the washing tank.

 The first and second outlets may further include a washing mode connected to the washing tank and an outlet of the washing tank connected to the second inlet to circulate the washing chemicals of the washing tank.

The waste heat recovery system as described above can save energy by heat recovery and discharge the low temperature water, thereby preventing the water pollution and reducing the air pollution by reducing the operating time of the boiler.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. 2 is a view showing an embodiment of the waste heat recovery facility according to the present invention. The waste heat tank 11 includes waste water containing waste heat after use, and a waste heat recovery pump for supplying waste water from the waste heat tank 11 to the filter 12, and the water supply tank 15 has water to the heat exchanger side 13. The boiler 14 is supplied with water passing through the heat exchanger 13 to increase the temperature to supply each generation. The temperature of the wastewater collected in the waste heat tank 11 is about 30 to 45 degrees Celsius, and after exiting the heat exchanger 13, the temperature is about 10 degrees and the temperature of the water contained in the water supply tank 15 is about 7 to 10 degrees. After exiting the heat exchanger, it is about 27-30 degrees. Boilers heat water with temperatures between 27 and 30 degrees, so it can consume less energy than with 7 to 10 degrees. The part except for the filter 12 is similar to the existing waste heat recovery facility, but the waste heat recovery system according to the present invention has a separate filter washing system, and is different from the existing filter.

3 shows a filter of a recovery system according to the present invention. The filter 12 of FIG. 3 is provided with a blocking plate 25 dividing the upper and lower portions in the hollow cylinder, but the plurality of micro holes are formed in the blocking plate 25 to allow water to pass through the micro holes. 25) a plurality of manure (26) is arranged on the top. The manure sphere is made of a material having a higher specific gravity than water, and when a plurality of piles are stacked, it is preferable to form a sphere because the gap between the manure spheres is used. When placing a plurality of beads on the blocking plate 25 is stacked in a multi-layer, but because the space is formed between the beads can pass water to this space.

A second outlet 24 is formed at the lower end of the blocking plate 25, and a first inlet 21 is formed below the blocking plate 25. The first inlet 21 is connected to the waste heat tank and the blocking plate is formed. The second inlet 23 formed above is connected to the water supply tank. In addition, the first outlet 22 formed on the opposite side of the second inlet 23 is connected to the heat exchanger.

When operating in the waste heat recovery mode, the first inlet 21 and the first outlet 22 are operated while the second inlet 23 and the second outlet 24 are locked, and the first inlet 21 is a filter. Because it is formed in the lower end of the foreign matter, such as dust or hair coming from the first inlet 21 is blocked by the layer formed by the blocking plate 25 and the filtering hole 26 will not rise upward and fall downward. On the other hand, since the water is filled from the bottom, even though the iron ball is blocked, the water exits to the gap between the beads and exits to the first outlet 22, so that the temperature of the water exiting to the first outlet 22 is maintained. All of this material can be removed.

When the beads have a greater specific gravity than the water, when the flow rate flowing into the first inlet 21 increases, the manure opening 26 may float, but water is supplied at a flow rate such that the manure opening does not float. You can also adjust

However, when operating in the waste heat recovery mode, if the flow rate and flow rate on the first outlet 22 side are blocked due to clogging between the filter openings or the hydraulic pressure drops, the pressure of the pressure sensor installed on the first outlet 22 side is detected or The backwash mode is entered at the set time.

In the backwash mode, the second inlet 23 and the second outlet 24 are opened while the first inlet 21 and the first outlet 22 are closed. When the second inlet opening 23 is opened, the water flowing into the second inlet opening 23 uses the clean water received from the water supply tank, so that the water flows from the upper side of the manure, and blocks the space between the manure, The hair falls down and is discharged to the outside through the second outlet 24. That is, even if the filter 12 is clogged with foreign matter, the foreign matter blocking the filter can be discharged to the outside through the backwashing operation so that the filter is not clogged by the wastewater flowing into the first inlet 21 so that the filter is always blocked. Waste heat can be recovered at a rate.

In the present invention, steel is used as a manure sphere, and materials such as PE, ceramic, and sand, and spheres and polygonal shapes may be used. The smaller the diaphragm, the smaller the dust can be filtered out.

5 is a view showing a state in which there is no waste heat recovery facility and the waste heat recovery facility according to the present invention. As shown in the table of FIG. 5, the operating time of the boiler is reduced from 12.5 hours to 8.25 hours every day, and has an effect of saving about 34% of fuel when viewed annually. In addition, when the equipment is installed, the investment cost is recovered in about one year, and when it is supplied in large quantities, the payback period is shorter. The conventional waste heat recovery facility can have similar effects when it is properly operated, but the conventional waste heat recovery facility has a heavy clogging of the filter. Although the present invention does not include such a cost, the present invention has a cost reduction effect as described above.

6 is another embodiment of a filter according to the present invention. In FIG. 3, the fluid moves from the lower part of the filter to the upper part in the waste heat recovery mode, and the reverse operation is performed in the backwash operation. In the embodiment of FIG. 6, the fluid moves from the upper part of the filter to the lower part during the waste heat recovery operation. In operation, fluid moves from the bottom of the filter to the top. This requires a lot of flow rates and flow rates because the dust and hair are sinking again due to their specific gravity, but in backwashing operations where water is supplied from the top to the bottom, dust and hair are discharged down with the water by gravity, so the flow rate and flow rate are low. Since only the filter type of FIG. 3 is required, it is much more economical to be able to use a smaller capacity pump.

Figure 7 shows another embodiment according to the present invention. In the embodiment of Figures 3 and 6, the backwashing operation uses water but can be washed using air and water. In other words, if a blower is installed in front of the second inlet and blows air if necessary, turbulent flow is formed in the fluid. You can remove fine dust from the surface of the manure. To this end, the water of the water supply tank and the air of the blower are introduced to the second inlet side.

FIG. 8 is a further embodiment as shown in FIG. 8 in order to wash the filter and the heat exchanger when stuck in a long period of time as another embodiment to be cleaned periodically with chemicals. That is, one or more of the first and second outlets are connected to the washing chemical tank and the washing chemical tank is connected to the second inlet in order to continuously wash the dust spots on the surface of the filter and other filter parts. Due to the circulation of the cleaning chemicals stuck in the manure ball is removed, so that it is possible to clean itself without additional cleaning.

 4 shows another embodiment of the present invention. In the embodiment of Figure 4 is an example using a manure sphere that is lighter than water specific gravity because the manure sphere floats in the water is placed above the manure block. In the normal waste heat recovery mode, the water entering through the first inlet has to pass through the first outlet through the manure opening, so that foreign matter is filtered out by the manure opening. Because it moves easily, it is easy to remove foreign substances caught between manure spheres.

1a, b show a conventional system

2 shows a system according to the invention;

3 is a view showing the structure of a filter according to the present invention (when the specific gravity of the filter sphere is greater than water)

4 is a view showing the structure of a filter according to the present invention (when the specific gravity of the filter sphere is smaller than water)

5 is a table showing the effect of the system according to the invention.

Figure 6 shows another system according to the present invention.

7 and 8 show yet another embodiment according to the present invention.

<Brief Description of Drawings>

11: Waste heat tank 12: Filter

13: heat exchanger 14: boiler

15: water supply tank

Claims (7)

As waste heat recovery system As a filter, the filter has a hollow hollow shape and a blocking plate formed with micropores is formed at the end of the filter to divide the inner space of the filter into an upper part and a lower part. The first inlet is formed on the bottom wall The second inlet and the first outlet are formed on the wall of the top The second outlet is formed on the bottom bottom surface A waste heat recovery system, including a filter, in which the manipulators are stacked and layered at one of the positions on the blocking plate and the position below the blocking plate, depending on the specific gravity of the filter sphere. The waste heat recovery system according to claim 1, wherein the manure sphere is one of a manure sphere having a larger specific gravity than water and a manure share having a specific gravity smaller than water, and has a larger diameter than the micropores formed in the blocking plate. The waste heat recovery system according to claim 1, wherein the first inlet is connected to a waste heat tank including waste water and the first outlet is connected to a heat exchanger. The waste heat recovery system according to claim 3, wherein the second inlet is connected to a water supply tank. The waste heat recovery system according to claim 3, wherein the second inlet is connected to any one or more of a water tank and a blower for supplying air and a washing tank. The waste heat recovery system according to claim 5, wherein the second discharge port is connected to the discharge port of the waste water exiting the heat exchanger, and the waste water passing through the backwash mode is introduced into the washing tank. The waste heat recovery system according to claim 6, wherein the first and second outlets are connected to the washing tank, and the outlet of the washing tank is connected to the second inlet, and further includes a washing mode for circulating the washing chemicals of the washing tank.

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