JP4046681B2 - Heating device and organic waste water treatment system equipped with the same - Google Patents

Description

The present invention relates to an organic waste water processing system equipped with a heating device and a heating device of this for heating the organic waste water.

  A lot of organic wastewater is generated in factories and the like, and various treatment systems have been proposed to treat the organic wastewater as required, and a methane fermentation treatment system is known as one of the treatment systems (for example, , See Patent Document 1). This methane fermentation treatment system includes a methane fermentation tank for methane fermentation of organic wastewater, and is anaerobically fermented in the methane fermentation tank and recovered as biogas. In anaerobic fermentation in a methane fermenter, when methane fermentation is performed in a medium temperature range of 30 to 38 ° C. (or a high temperature range of 50 to 60 ° C.), the fermentation is promoted and biogas can be efficiently recovered. .

  For this reason, the organic waste water is heated in the heating device and then fed to the methane fermentation tank, and a heat exchanger is used as such a heating device. The heat exchanger includes a heat transfer tube for performing heat exchange, and steam or hot water is supplied through the heat transfer tube. In this heat exchanger, heat exchange is performed between water vapor (or hot water) flowing in the heat transfer tube and organic waste water flowing around the heat transfer tube, and the organic waste water is heated to a desired temperature by such heat exchange.

JP 2003-245631 A

  In such a conventional heating apparatus, steam (or hot water) as a heat medium used for heat exchange in a heat exchanger must be generated by a boiler or the like, and fuel for generating steam (or hot water) is used. There is a problem that consumption and operating costs increase.

  In order to solve such a problem of operating costs, for example, it has been proposed to use combustion exhaust gas from an engine (for example, a gas engine) used in a cogeneration system or the like. However, when the temperature of the combustion exhaust gas is high, it can be used for heating the heat medium. For example, after the combustion exhaust gas from the engine is used in an exhaust heat boiler or the like, the temperature of the combustion exhaust gas becomes low. However, it is difficult to heat the heat medium even if the low-temperature combustion exhaust gas is subjected to heat exchange using a heat exchanger. Is currently released into the atmosphere without being recovered.

An object of the present invention is to provide a heating device that can heat a liquid to be heated by using the heat of combustion exhaust gas having a relatively low temperature.
Another object of the present invention is to heat the exhaust gas at a relatively low temperature to a temperature suitable for the treatment of organic waste water by using the heat, thereby increasing the treatment efficiency of the organic waste water. It is to provide an organic wastewater treatment system that can be used.

The heating apparatus according to claim 1 of the present invention includes a heating tank for heating the heated liquid, a liquid feeding means for feeding the heated liquid to the heating tank, and the heating apparatus. an exhaust gas delivery means for delivering the combustion exhaust gas to the heating tank, a heating device you equipped with,
Said heating tank, comprising an exhaust gas chamber the combustion exhaust gas from the exhaust gas delivery means flows, and a gas-liquid contact chamber to be pressurized heat the liquid from said liquid feed means is fed, the The gas-liquid contact chamber is composed of a lower gas-liquid contact chamber disposed above the exhaust gas chamber and an upper gas-liquid contact chamber disposed above the lower gas-liquid contact chamber, and the exhaust gas A lower ventilation partition wall is provided between the lower gas liquid contact chamber and the lower gas liquid contact chamber, and an upper ventilation partition wall is provided between the lower gas liquid contact chamber and the upper gas liquid contact chamber. And the upper ventilation partition wall is provided with a plurality of ventilation slits extending in an oblique direction,
The heated liquid flows from the upper gas-liquid contact chamber through the lower gas-liquid contact chamber, and the combustion exhaust gas from the exhaust gas chamber is in contact with the lower gas-liquid through the plurality of ventilation slits of the lower ventilation partition wall. It is supplied to the chamber in the form of bubbles, and then is supplied to the upper gas-liquid contact chamber in the form of bubbles through the plurality of ventilation slits of the upper ventilation partition wall.

In the warming device according to claim 2 of the present invention, the lower gas-liquid contact chamber and the upper gas-liquid contact chamber are communicated with each other by a communication pipe structure, and the communication pipe structure stores a heated liquid. An end portion of the U-shaped tube portion is communicated with the upper gas-liquid contact chamber, and the other end portion is communicated with the lower gas-liquid contact chamber via a connecting tube portion extending downward, The other end portion of the U-shaped tube portion communicates with the upper gas-liquid contact chamber via a gas vent tube portion extending upward.

Moreover, the organic waste water treatment system of Claim 3 of this invention is an organic waste water tank which accumulates organic waste water, the heating apparatus of Claim 1 or 2 , and anaerobic methane fermentation for the said organic waste water anaerobic fermentation tank, an organic waste water treatment system and a heat exchanger for recovering waste heat of the combustion exhaust gas,
The liquid feeding means of the warming device feeds the organic wastewater in the organic drainage tank to the gas-liquid contact chamber of the warming tank of the warming device, and the organic wastewater from the liquid feeding means The exhaust gas supply means of the heating device flows from the liquid contact chamber through the lower gas-liquid contact chamber and supplies the combustion exhaust gas heat-exchanged in the heat exchanger to the exhaust gas chamber of the heating tank. the combustion exhaust gas from the exhaust gas chamber, the lower gas-liquid contact by passing a plurality of ventilation slits disposed the lower ventilation partition wall between the lower gas-liquid contact chamber and the exhaust gas chamber Bubbles are fed into the chamber and then bubbled into the upper gas-liquid contact chamber through a plurality of ventilation slits in the upper ventilation partition wall disposed between the lower gas-liquid contact chamber and the upper gas-liquid contact chamber Jo to be delivered, thereby, the organic waste water is warmed to a temperature suitable for anaerobic methane fermentation, then, Temperature organic wastewater characterized in that it is fed to the anaerobic fermenter.

Moreover, the organic waste water treatment system according to claim 4 of the present invention is an organic drainage tank for storing organic waste water, the heating device according to claim 1 or 2 , and an aerobic treatment for the organic waste water. an organic waste water treatment system comprising aerobic treatment tank, and a heat exchanger for recovering waste heat of the combustion exhaust gas,
The liquid feeding means of the warming device feeds the organic wastewater in the organic drainage tank to the gas-liquid contact chamber of the warming tank of the warming device, and the organic wastewater from the liquid feeding means The exhaust gas supply means of the heating device flows from the liquid contact chamber through the lower gas-liquid contact chamber and supplies the combustion exhaust gas heat-exchanged in the heat exchanger to the exhaust gas chamber of the heating tank. the combustion exhaust gas from the exhaust gas chamber, the lower gas-liquid contact through a plurality of vent slits bets disposed the lower ventilation partition wall between the lower gas-liquid contact chamber and the exhaust gas chamber The bubbles are fed into the chamber in the form of bubbles , and then bubbles are formed in the upper gas-liquid contact chamber through a plurality of ventilation slits in the upper ventilation partition wall disposed between the lower gas-liquid contact chamber and the upper gas-liquid contact chamber. Jo to be delivered, thereby, the organic waste water is warmed to a temperature suitable for aerobic treatment, then warmed Organic wastewater characterized in that it is fed to the aerobic treatment tank.

In the organic waste water treatment system according to claim 5 of the present invention, the temperature of the combustion exhaust gas fed to the exhaust gas chamber of the heating tank by the exhaust gas feeding means is 70 to 170 ° C. The organic waste water is heated to 30 to 60 ° C. by gas-liquid contact between the combustion exhaust gas and the organic waste water in the gas-liquid contact chamber of the warming device.

According to the heating device of the first aspect of the present invention, the heating tank for heating the liquid to be heated includes the exhaust gas chamber and the gas-liquid contact chamber, and the combustion exhaust gas is supplied to the exhaust gas chamber, The liquid to be heated is fed to the gas-liquid contact chamber. The gas-liquid contact chamber is composed of a lower gas-liquid contact chamber and an upper gas-liquid contact chamber, and the exhaust gas chamber and the lower gas-liquid contact chamber are partitioned through a lower ventilation partition wall provided with a plurality of ventilation slits. Since the ventilation partition wall and the upper gas-liquid contact chamber are partitioned through an upper ventilation partition wall provided with a plurality of ventilation slits, the combustion exhaust gas fed to the exhaust gas chamber is separated from the lower ventilation partition wall. The air is supplied in the form of bubbles to the lower gas-liquid contact chamber through the ventilation slits, and is then supplied in the form of bubbles to the upper gas-liquid contact chamber through the plurality of ventilation slits in the upper ventilation partition wall. The heated liquid can be heated by gas-liquid contact between the liquid and the heated liquid. In addition, since this heating is performed by gas-liquid contact with the combustion exhaust gas that is delivered in the gas-liquid contact chamber in the form of small bubbles, heat transfer efficiency is high, and the temperature of the combustion exhaust gas is relatively high. Even if it is low (in other words, even if the temperature difference between the heated liquid and the combustion exhaust gas is as small as about 10 to 30 ° C.), the heated liquid can be heated. In addition, since the liquid to be heated is heated by gas-liquid contact by the gas-liquid contact chambers provided in the upper and lower stages in this way, the heating tank can be made compact while maintaining a desired heating capability. Further, since the plurality of ventilation slits provided in the lower ventilation partition wall and the upper ventilation partition wall extend in an oblique direction, the combustion exhaust gas is in the form of small bubbles, and the lower gas-liquid contact chamber and the upper gas-liquid contact chamber The heated liquid can be efficiently heated by improving the gas-liquid contact efficiency. Furthermore, the heated liquid flows from the upper gas-liquid contact chamber to the lower gas-liquid contact chamber, whereas the combustion exhaust gas fed to the exhaust gas chamber flows from the lower gas-liquid contact chamber to the upper gas-liquid contact chamber. In the lower gas-liquid contact chamber, the combustion exhaust gas from the exhaust gas chamber comes into contact with the heated liquid heated in the upper gas-liquid contact chamber, and thus the temperature of the heated liquid and the combustion exhaust gas. Even if the difference is relatively small, the liquid to be heated can be heated sufficiently to a temperature close to the temperature of the combustion exhaust gas.

According to the heating device of the second aspect of the present invention, the lower gas-liquid contact chamber and the upper gas-liquid contact chamber are connected by the communication pipe structure, and one end of the U-shaped pipe portion of the communication pipe structure Since the part is connected to the upper gas-liquid contact chamber and the other end communicates with the lower gas-liquid contact chamber via the connecting pipe portion extending downward, the heated liquid heated in the upper gas-liquid contact chamber Is fed to the lower gas-liquid contact chamber through the U-shaped tube portion and the connecting tube portion. In addition, since the other end of the U-shaped tube is communicated with the upper gas-liquid contact chamber via the gas vent tube, the gas accumulated in the other end of the U-shaped tube (separated from the liquid to be heated) The combustion exhaust gas) flows into the upper gas-liquid contact chamber through the gas vent pipe. In addition, the upper gas-liquid contact chamber and the lower gas-liquid contact chamber are kept in communication with each other via the connecting pipe portion and the gas vent pipe portion, and the lower gas-liquid contact chamber and the upper gas-liquid contact chamber are maintained at the same pressure. be able to.

According to the organic waste water treatment system of the third aspect of the present invention, the organic waste water from the organic waste water tank is fed to the gas-liquid contact chamber of the heating tank by the liquid feeding means, and the combustion exhaust gas is discharged. recovery of exhaust heat in a heat exchanger for heat recovery is performed, the combustion exhaust gas after being heat recovery is fed to the exhaust gas chamber of the heating tank by the exhaust gas feeding means, in the heating tank Since the organic waste water is heated by the gas-liquid contact between the combustion exhaust gas and the organic waste water, the organic waste water can be efficiently heated. The gas-liquid contact chamber includes a lower gas-liquid contact chamber and an upper gas-liquid contact chamber, and a lower ventilation partition wall is provided between the exhaust gas chamber and the lower gas-liquid contact chamber. An upper ventilation partition wall is provided between the upper air-liquid contact chamber and the liquid to be heated is heated in the gas-liquid contact by the gas-liquid contact chamber provided in two stages in this way, so that the desired heating The heating tank can be made compact while maintaining the capacity. Further, since the plurality of ventilation slits provided in the lower ventilation partition wall and the upper ventilation partition wall extend in an oblique direction, the combustion exhaust gas is in the form of small bubbles, and the lower gas-liquid contact chamber and the upper gas-liquid contact chamber The heated liquid can be efficiently heated by increasing the gas-liquid contact efficiency. Furthermore, the heated liquid flows from the upper gas-liquid contact chamber to the lower gas-liquid contact chamber, whereas the combustion exhaust gas fed to the exhaust gas chamber flows from the lower gas-liquid contact chamber to the upper gas-liquid contact chamber. In the lower gas-liquid contact chamber, the combustion exhaust gas from the exhaust gas chamber comes into contact with the heated liquid heated in the upper gas-liquid contact chamber, and thus the temperature of the heated liquid and the combustion exhaust gas. Even if the difference is relatively small, the liquid to be heated can be heated sufficiently to a temperature close to the temperature of the combustion exhaust gas. In addition, since organic wastewater heated to a temperature suitable for anaerobic fermentation in the heating tank is fed to the anaerobic fermentation tank, fermentation in the anaerobic fermentation tank is promoted and organic wastewater is efficiently fermented. Can do. In addition, since the combustion exhaust gas after heat exchange in the heat exchanger for exhaust heat recovery is used in the heating tank, the exhaust heat recovery efficiency is further enhanced by effectively using the sensible heat and latent heat of the combustion exhaust gas. be able to. The anaerobic fermentation is, for example, methane fermentation, and in this methane fermentation, the organic waste water is heated to an appropriate temperature in, for example, a medium temperature range (30 to 38 ° C.) or a high temperature range (50 to 60 ° C.). Is done.

According to the organic waste water treatment system of claim 4 of the present invention, the organic waste water from the organic waste water tank is fed to the gas-liquid contact chamber of the heating tank by the liquid feeding means, and the heat for exhaust heat recovery Combustion exhaust gas after exhaust heat recovery by the exchanger is sent to the exhaust gas chamber of the heating tank by the exhaust gas feeding means, and the gas-liquid contact between the combustion exhaust gas and the organic waste water in this heating tank Since the organic waste water is heated by this, the organic waste water can be efficiently heated. The gas-liquid contact chamber includes a lower gas-liquid contact chamber and an upper gas-liquid contact chamber, and a lower ventilation partition wall is provided between the exhaust gas chamber and the lower gas-liquid contact chamber. An upper ventilation partition wall is provided between the upper air-liquid contact chamber and the liquid to be heated is heated in the gas-liquid contact by the gas-liquid contact chamber provided in two stages in this way, so that the desired heating The heating tank can be made compact while maintaining the capacity. Further, since the plurality of ventilation slits provided in the lower ventilation partition wall and the upper ventilation partition wall extend in an oblique direction, the combustion exhaust gas is in the form of small bubbles, and the lower gas-liquid contact chamber and the upper gas-liquid contact chamber The heated liquid can be efficiently heated by improving the gas-liquid contact efficiency. Furthermore, the heated liquid flows from the upper gas-liquid contact chamber to the lower gas-liquid contact chamber, whereas the combustion exhaust gas fed to the exhaust gas chamber flows from the lower gas-liquid contact chamber to the upper gas-liquid contact chamber. In the lower gas-liquid contact chamber, the combustion exhaust gas from the exhaust gas chamber comes into contact with the heated liquid heated in the upper gas-liquid contact chamber, and thus the temperature of the heated liquid and the combustion exhaust gas. Even if the difference is relatively small, the liquid to be heated can be heated sufficiently to a temperature close to the temperature of the combustion exhaust gas. Moreover, since organic waste water heated to a temperature suitable for aerobic treatment in the heating tank is fed to the aerobic treatment tank, the treatment of the organic waste water in the aerobic treatment tank is promoted, and the organic waste water is efficiently discharged. Can be processed. In addition, since the combustion exhaust gas after heat exchange in the heat exchanger for exhaust heat recovery is used in the heating tank, the exhaust heat recovery efficiency is further enhanced by effectively using the sensible heat and latent heat of the combustion exhaust gas. be able to.

Moreover, according to the organic waste water treatment system according to claim 5 of the present invention, the combustion exhaust gas having a temperature of 70 to 170 ° C. after being heat-exchanged in the heat exchanger for exhaust heat recovery is supplied to the heating device. Since it is used for heating the organic waste water, the heat of the combustion exhaust gas can be sufficiently recovered and the exhaust heat recovery efficiency can be greatly enhanced. Moreover, since organic waste water is heated to 30-60 degreeC by the gas-liquid contact with combustion exhaust gas of such temperature, processing of organic waste water can be performed efficiently.

Hereinafter, with reference to an accompanying drawing, a heating device according to the present invention and an organic waste water treatment system provided with the same will be described.
Embodiment of Warming Device First, an embodiment of a warming device for warming a liquid to be heated will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a heating device according to an embodiment, and FIG. 2 is a plan cross-sectional view showing an upper gas-liquid contact chamber of the heating device in FIG.

  1 and 2, the illustrated heating device 2 includes a heating tank 4 that heats the heated liquid by bringing the combustion exhaust gas and the heated liquid, for example, organic waste water, into gas-liquid contact with each other. In this embodiment, the heating tank 4 includes a lower housing 6 and an upper housing 8, an exhaust gas chamber 10 is defined in the lower housing 6, and a lower gas-liquid contact chamber 12 and an upper gas-liquid contact chamber are provided in the upper housing 8. 14 is defined.

For example, the exhaust gas chamber 10 is configured to be supplied with combustion exhaust gas from a gas engine (not shown) of a cogeneration system. An exhaust gas feed pipe 16 is connected to the lower housing 6, and a feed blower (not shown) is disposed in the exhaust gas feed pipe 16, and combustion from the gas engine is performed by the suction action of the feed blower. The exhaust gas is supplied to the exhaust gas chamber 10 through the exhaust gas supply pipe 16, and the exhaust gas supply pipe 16 and the supply blower constitute exhaust gas supply means. The combustion exhaust gas may be a combustion exhaust gas from a gas engine, but is not limited thereto, and a combustion exhaust gas such as a gas fired boiler or a heavy oil fired boiler may be used. Good.

  In the heating tank 4, a lower gas / liquid contact chamber 12 is disposed above the exhaust gas chamber 10, and an upper gas / liquid contact chamber 14 is disposed above the lower gas / liquid contact chamber 12. A lower ventilation partition wall 18 is provided between the lower gas-liquid contact chamber 12 and an upper air-liquid partition wall 20 is provided between the lower gas-liquid contact chamber 12 and the upper gas-liquid contact chamber 14. In this embodiment, a supply port 22 for supplying a heated liquid to be heated, for example, organic waste water, is provided at one end of the upper gas-liquid contact chamber 14 (the right end in FIGS. 1 and 2). A discharge port 24 for discharging the heated liquid is provided at one end of the chamber 12 (the right end in FIGS. 1 and 2), and other than the upper gas-liquid contact chamber 14 and the lower gas-liquid contact chamber 12. A communication pipe structure 26 for supplying the liquid to be heated in the upper gas-liquid contact chamber 14 to the lower gas-liquid contact chamber 12 is provided on the end side (left end side in FIGS. 1 and 2).

  The illustrated communication tube structure 26 has a U-shaped tube portion 28 extending in a substantially U shape, and one end portion (the right end portion in FIG. 1) of the U-shaped tube portion 28 communicates with the upper gas-liquid contact chamber 14. This one end defines the outlet 30. The other end portion of the U-shaped tube portion 28 has a slightly lower vertical height than one end portion, and the other end portion is connected to the lower gas liquid via a connecting tube portion 32 that extends downward in a substantially L shape. The contact chamber 12 communicates with the downstream end of the connecting pipe portion 32 to define an inflow port 34. The other end portion of the U-shaped tube portion 28 communicates with the upper gas-liquid contact chamber 14 via a gas vent tube portion 36 extending upward in a substantially L shape, and an upper end portion thereof defines a gas vent port 38. . In the upper gas-liquid contact chamber 14, the vertical position of the supply port 22 is set higher than the outlet 30 of the communication pipe structure 26, and the vertical position of the gas vent 38 is set higher than the position of the supply port 22. Has been. In the lower gas-liquid contact chamber 12, the vertical position of the inlet 34 is set higher than the outlet 24.

  With this configuration, the heated liquid supplied from the supply port 22 to the upper gas-liquid contact chamber 14 flows out from the outlet 30 to the downstream side, and the heated liquid in the upper gas-liquid contact chamber 14 flows. The level is the position of the outlet 30. Further, the liquid to be heated fed downstream through the communication pipe structure 26 flows into the lower gas-liquid contact chamber 12 from the inlet 34 and is discharged from the discharge port 24 to be heated in the lower gas-liquid contact chamber 12. The liquid level is the position of the outlet 24. In the communication pipe structure 26, a part of the heated liquid flowing from the upper gas-liquid contact chamber 14 to the lower gas-liquid contact chamber 12 is accumulated in the U-shaped pipe portion 28, and the U-shaped pipe portion 28 is heated. The gas separated from the liquid (mostly combustion exhaust gas) flows into the upper gas-liquid contact chamber 14 through the gas vent pipe 36. Further, since the lower gas-liquid contact chamber 12 and the upper gas-liquid contact chamber 14 are communicated with each other via the connection pipe portion 32 and the gas vent pipe portion 36 of the communication pipe structure 26, both the gas-liquid contact chambers 12, 14 are connected. Are kept at the same pressure. In addition, since the gas vent port 38 of the gas vent pipe portion 36 is disposed at a position higher than the supply port 22, the gas vent port 38 is not immersed in the liquid to be heated, and the gas vent function and both gas-liquid contact are performed. The pressure equalizing function of the chambers 12 and 14 is not impaired.

  The lower ventilation partition wall 18 and the upper ventilation partition wall 20 are provided with a number of ventilation slits 40 and 42, respectively. The upper gas-liquid contact chamber 14 and the upper ventilation partition wall 20 and the lower gas-liquid contact chamber 12 and the lower ventilation partition wall 18 have substantially the same configuration, and mainly referring to FIG. The upper ventilation partition wall 20 will be described. The upper gas-liquid contact chamber 14 (lower gas-liquid contact chamber 12) has an elongated rectangular shape, and its longitudinal direction (the flow direction of the liquid to be heated is shown in FIGS. 1 and 2). A plurality of ventilation slits 42 (40) are arranged at intervals in the left-right direction). By forming the rectangular shape in this way, the length of the upper gas-liquid contact chamber 14 (lower gas-liquid contact chamber 12) in the flow direction of the heated liquid can be secured, and the heated liquid will be described later. Thermal efficiency can be increased.

  The plurality of ventilation slits 42 (40) are provided at intervals in the longitudinal direction of the upper ventilation partition wall 20 (lower ventilation partition wall 18) (the flow direction of the liquid to be heated). 42 (40) is provided in a straight line from one side end to the other side end in the width direction of the upper ventilation partition wall 20 (lower ventilation partition wall 18) (the direction perpendicular to the paper surface in FIG. 1, the vertical direction in FIG. 2). Yes. Each ventilation slit 42 (40) is provided so as to extend obliquely in the oblique direction, and by providing in this oblique direction, the combustion exhaust gas flowing through the ventilation slit 42 (40) becomes a small bubble and is It is sent to the heated liquid in the liquid contact chamber 14 (lower gas-liquid contact chamber 12), and the gas-liquid contact efficiency between the combustion exhaust gas and the heated liquid can be increased.

  As shown in FIG. 1, the plurality of ventilation slits 42 (40) have ventilation slits 42 (40) provided on one side (right side in FIGS. 1 and 2) with the central portion in the longitudinal direction as a boundary. Is inclined upward and extended to one side (right side in FIGS. 1 and 2), and the ventilation slit 42 (40) provided on the other side (left side in FIGS. 1 and 2) is directed upward. The other side (left side in FIGS. 1 and 2) is inclined and extends, and thus the ventilation slit 42 (40) is provided to allow combustion exhaust gas to flow into the upper gas-liquid contact chamber 14 (lower gas-liquid contact chamber). 12) The liquid to be heated can be made to act substantially uniformly.

Next, heating of the liquid to be heated by the heating device 2 described above will be described. The pressurized heat liquid to be heated, for example, 25 ° C. the heated liquid around is supplied to the upper respiratory-liquid contact chamber 14 of the heating tank 4 through the supply port 22 as shown by arrow 46. The heated liquid thus supplied flows from one end side (right end side in FIG. 1) to the other end side (left end side in FIG. 1) of the upper gas-liquid contact chamber 14, and then the U-shape of the communication mechanism 26. Then, the gas is supplied to the lower gas-liquid contact chamber 12 through the tubular tube 28 and the connecting tube 32. Thus, the heated liquid supplied to the lower gas-liquid contact chamber 12 flows from the other end side (left end side in FIG. 1) to one end side (right end side in FIG. 1) of the lower gas-liquid contact chamber 12, and this one end As shown by an arrow 48, the gas is discharged from a discharge port 24 provided on the side.

  When warming, for example, combustion exhaust gas at around 80 ° C. is fed to the exhaust gas chamber 10 of the warming tank 4 through the exhaust gas feed pipe 16 of the exhaust gas feed means. The combustion exhaust gas thus supplied is supplied to the lower gas-liquid contact chamber 12 through a number of ventilation slits 40 provided in the lower ventilation partition wall 18, and thereafter, a number of the combustion exhaust gases provided in the upper ventilation partition wall 20. After being supplied to the upper gas-liquid contact chamber 14 through the ventilation slit 42, it is discharged to the outside through the gas discharge port 52 provided in the upper wall 50.

In the upper gas-liquid contact chamber 14, the combustion exhaust gas fed in the form of bubbles through the liquid to be heated and the ventilation slit 42 of the upper ventilation partition wall 20 (used for heating in the lower gas-liquid contact chamber 12). And the heated liquid is heated by the heat of the combustion exhaust gas, and the heated liquid heated in the upper gas-liquid contact chamber 14 is sent to the lower gas-liquid contact chamber 12 through the communication pipe structure 26. Be paid. In the lower gas-liquid contact chamber 12, the heated liquid supplied from the upper gas-liquid contact chamber 14 and the combustion exhaust gas (exhaust gas supply) supplied in the form of bubbles through the ventilation slit 40 of the lower ventilation partition wall 18. The combustion exhaust gas fed through the supply pipe 16 is in gas-liquid contact, and also in the lower gas-liquid contact chamber 12, the liquid to be heated is heated by the heat of the combustion exhaust gas. At this time, the heated liquid heated in the upper gas-liquid contact chamber 14 (heated to a certain extent and heated) is supplied to the lower gas-liquid contact chamber 12, while the exhaust gas chamber 10 The combustion exhaust gas (combustion exhaust gas that has not been heat-recovered by gas-liquid contact) is bubbled through the ventilation slit 40 and fed to the liquid to be heated. Therefore, the combustion exhaust gas is sufficiently heated by the combustion exhaust gas. The heated liquid heated to a desired temperature, for example, around 38 ° C. is discharged from the drain port 24. In this heating tank 4, the liquid to be heated is heated by gas-liquid contact, so that heating can be performed efficiently, and the temperature of the combustion exhaust gas discharged from the upper gas-liquid contact chamber 14 and the supply port 22 are increased. can be the temperature of the heated liquid supplied to the gas-liquid contact chamber 14 is heated to heat the collected and the pressurized heat liquid in the combustion exhaust gas to the extent that substantially equal.

  FIG. 3 shows a modification of the heating tank in the heating device. In the following embodiments, the same reference numerals are given to substantially the same components as those shown in FIGS. 1 and 2, and the description thereof is omitted.

  In FIG. 3, in this heating tank 4A, a lower housing (not shown) and an upper housing 8A have substantially the same configuration, and the outer shape is formed in a circular shape. A columnar portion 62 extending in the vertical direction is provided at a substantially central portion of the upper gas-liquid contact chamber 14A (lower gas-liquid contact chamber 12A) defined by the upper housing 8A, and between the columnar portion 62 and the upper housing 8A. A partition wall 64 is provided. In the upper housing 8A, a supply port 22A (discharge port 24A) is provided in one side portion (upper side in FIG. 3) in the vicinity of the partition wall 64, and an outlet 30A (inlet) is provided in the other side portion in the vicinity of the partition wall 64. 34A) is provided, and the upper gas-liquid contact chamber 14A (lower gas-liquid contact chamber 12A) extends in a substantially circular shape by such a configuration, and a long distance can be secured with a relatively small space. .

  Further, an upper ventilation partition wall 20A (lower ventilation partition wall 18A) is provided between the upper gas-liquid contact chamber 14A (lower gas-liquid contact chamber 12A) and the lower gas-liquid contact chamber 12A (exhaust gas chamber). The ventilation partition wall 20A (lower ventilation partition wall 10A) is provided with a plurality of ventilation holes 42A (40A). Each air hole 42A (40A) is formed in a circular shape, but can be formed in other appropriate shapes.

  In this heating tank 4A, the heated liquid to be heated is supplied from the supply port 22A as indicated by an arrow, and as indicated by the arrow from the supply port 22A, the upper gas-liquid contact chamber 14A is connected from one end to the other end. To the lower gas-liquid contact chamber 12A via the communication pipe structure (not shown) described above. The heated liquid fed from the inflow port 34A to the lower gas-liquid contact chamber 12A flows from the other end side to the one end side of the lower gas-liquid contact chamber 12A, and is discharged to the outside from the discharge port 24A. Further, the combustion exhaust gas supplied to the exhaust gas chamber is supplied in the form of bubbles to the lower gas-liquid contact chamber 12A through the vent hole 40A of the lower ventilation partition wall 18, and further passes through the vent hole 42A of the upper ventilation partition wall 20. The gas is supplied to the upper gas-liquid contact chamber 14A in the form of bubbles and then discharged to the outside. In the lower gas-liquid contact chamber 12A and the upper gas-liquid contact chamber 14A, the gas-liquid contact between the combustion exhaust gas and the heated liquid is performed in the same manner as described above, so that the heated liquid can be efficiently heated. it can.

  The above-described heating device can be applied to an organic wastewater treatment system, such as an anaerobic fermentation treatment system, an aerobic treatment system, and the like, and can be advantageously used to warm organic wastewater in such a system. .

Organic Wastewater Treatment System Next, referring to FIG. 4, an anaerobic fermentation treatment system in which the heating device 2 shown in FIGS. 1 and 2 (heating device 2A shown in FIG. 3) is one of the organic wastewater treatment systems. An example applied to is described. FIG. 4 is a system diagram schematically illustrating an anaerobic fermentation treatment system according to an embodiment.

In FIG. 4, the illustrated anaerobic fermentation treatment system is combined with a cogeneration system, and is configured such that combustion exhaust gas from the gas engine 102 of the cogeneration system is used. More specifically, the anaerobic fermentation treatment system includes the heating device 2 shown in FIGS. 1 and 2, an organic drainage tank 104 that stores organic wastewater generated in a factory, an anaerobic fermentation tank 106 that performs anaerobic methane fermentation, anaerobic A pretreatment facility 108 for pretreating biogas generated in the fermentative fermenter 106, that is, a gas mainly composed of methane gas, and a fermentation residue treatment facility 110 for treating fermentation residues remaining after anaerobic fermentation are provided.

  A generator 112 is drivingly connected to the gas engine 102 of the cogeneration system, and is operated by the operation of the gas engine 102 to generate electric power. This generated electric power is consumed by the electric power load. The combustion exhaust gas from the gas engine 102 flows through an exhaust heat recovery heat exchanger 114, for example, an exhaust heat recovery boiler heat exchanger. Water is supplied to the heat exchanger 114 for exhaust heat recovery, heat exchange is performed with the combustion exhaust gas to generate hot water, and exhaust heat is recovered as hot water, thus performing exhaust heat recovery. As a result, the temperature of the combustion exhaust gas from the gas engine 102 decreases to about 70 to 150 ° C.

The combustion exhaust gas heat-exchanged by the heat exchanger 114 for exhaust heat recovery is supplied to the exhaust gas chamber 10 of the heating tank 4 of the heating device 2 by the exhaust gas supply means 116. Exhaust gas delivery means 116 is provided with an exhaust gas feed pipe 16 for guiding the combustion exhaust gas from the exhaust heat recovery heat exchanger 114 to the exhaust gas chamber 10 of the heating tank 4, this exhaust gas feed pipe 16 A feed blower 118 is disposed on the front side. With this configuration, when the feed blower 118 is activated, the combustion exhaust gas heat-exchanged in the exhaust heat recovery heat exchanger 114 is heated through the exhaust gas feed pipe 16 by the suction and feed action. It is fed to the exhaust gas chamber 10 of the tank 4.

  Organic wastewater generated in a factory or the like is stored in an organic drainage tank 104, and the organic wastewater stored in the organic drainage tank 104 is subjected to anaerobic fermentation treatment, that is, anaerobic methane fermentation treatment. Organic wastewater from the organic drainage tank 104 is fed to the heating tank 4 by the liquid feeding means 120. The liquid feeding means 120 includes a liquid feeding pipe 122 that guides organic waste water to the upper gas-liquid contact chamber 14 of the heating tank 4, and a drainage supply pump 124 is disposed in the liquid feeding pipe 122. As a result, the organic drainage in the organic drainage tank 104 is supplied to the upper gas-liquid contact chamber 14 of the heating tank 4 through the liquid feed pipe 122. The temperature of the organic waste water supplied to the upper gas-liquid contact tank 14 is about 15 to 25 ° C.

  In the heating tank 4 (the lower gas-liquid contact chamber 12 and the upper gas-liquid contact chamber 14), the combustion exhaust gas from the gas engine 102 and the organic waste water from the organic drainage tank 104 are in gas-liquid contact as described above. By this gas-liquid contact, the organic waste water is heated to a temperature suitable for the anaerobic fermentation treatment. When this anaerobic fermentation process is an anaerobic methane fermentation process, it heats to 30-38 degreeC which is an intermediate temperature range, or 50-60 degreeC which is a high temperature range.

  The organic waste water heated in the heating tank 4 is supplied to the anaerobic fermentation tank 106, and anaerobic fermentation treatment, that is, methane fermentation treatment is performed in the anaerobic fermentation tank 106. The biogas generated by the methane fermentation process, that is, the gas mainly composed of methane, is supplied to the pretreatment facility 108, purified by the pretreatment facility 108, and then supplied to the gas engine 102. Used as fuel. Moreover, the fermentation residue after having been fermented in the anaerobic fermenter 106 is sent to the fermentation residue processing facility 110 and processed as required in the fermentation residue processing facility 110.

  In this organic wastewater treatment system, the combustion exhaust gas from the gas engine 102 is sent to the heat exchanger 114 for exhaust heat recovery to perform exhaust heat recovery, and is further supplied to the heating device 2 so as to remove the gas from the organic waste water. Since exhaust heat recovery is performed by liquid contact, the sensible heat and latent heat of the combustion exhaust gas can be recovered, and the exhaust heat recovery rate can be increased. Moreover, since the biogas generated in the anaerobic fermenter 106 is used as the fuel for the gas engine 102, the operating efficiency of the processing system can be increased and the operating cost can be reduced.

  FIG. 5 shows another embodiment of the organic wastewater treatment system. In this other example, the organic wastewater treatment system is applied to an aerobic treatment system. FIG. 5 is a system diagram schematically showing an example applied to an aerobic processing system, and this processing system is also combined with a cogeneration system.

  In FIG. 5, in the aerobic system, an aerobic treatment tank 132 that performs an aerobic treatment is used instead of the anaerobic fermentation tank 106. The combustion exhaust gas from the gas engine 102 is exhausted by the exhaust heat recovery heat exchanger 114 and then supplied to the exhaust gas chamber 10 of the heating tank 4, and the organic waste water from the organic drain tank 104 is added. It is fed to the upper gas-liquid contact chamber 14 of the warm bath 4 and is heated to a temperature suitable for aerobic treatment by gas-liquid contact with the combustion exhaust gas while flowing through the upper gas-liquid contact chamber 14 and the lower gas-liquid contact chamber 12. Be warmed. The heated organic waste water is supplied to the aerobic treatment tank 132, and processing air is also supplied to the aerobic treatment tank 132, and the aerobic treatment of the organic waste water, for example, odor removal treatment is performed by the supplied air. The aerobic treated organic waste water is sent downstream. The other configuration of this treatment system is substantially the same as the treatment system shown in FIG. 4, and even if the heating device 2 is applied to such an aerobic treatment system, the organic waste water is efficiently heated. Tempering efficiency can be increased.

  In order to confirm the effect of the heating apparatus described above, the following experiment was performed. 1 and 2 was used as the heating device, and the dimensions of the heating device were as follows. The length of the lower gas-liquid contact chamber and the upper gas-liquid contact tank in the longitudinal direction was 120 cm, and the length in the width direction was 20 cm. The fuel exhaust gas from the gas engine is used as the combustion exhaust gas. The width of the ventilation slit provided in the lower ventilation partition wall and the upper ventilation partition wall is 2 mm, and the ventilation partition walls (lower ventilation partition wall, upper ventilation partition wall) The slit area ratio (ratio of the total area of the passage slit to the total area of the passage partition wall) was 0.019.

In this experiment, 80 ° C. combustion exhaust gas was supplied to the exhaust gas chamber of the heating tank at a rate of 180.6 m ³ / h, and 25.2 ° C. organic waste water was supplied to the upper gas-liquid contact chamber of the heating tank. Was fed at a rate of 600 kg / h, and the organic waste water was heated by gas-liquid contact in the upper gas-liquid contact chamber and the lower gas-liquid contact chamber of the heating tank. By heating in the heating tank, the exhaust flow rate of the combustion exhaust gas from the upper gas-liquid contact chamber was 158 m ³ / h, and the temperature was lowered to 25.8 ° C. On the other hand, the outflow rate of the organic waste water discharged from the lower gas-liquid contact chamber was 618.1 kg / h, and the temperature was increased to 45.7 ° C. By this gas-liquid contact, the sensible heat of the combustion exhaust gas is 3,405 kcal / h, the latent heat is 10,554 kcal / h, and a total of 13,959 kcal / h of heat is recovered. The heat of 127 kcal / h was absorbed. In addition, the temperature of the combustion exhaust gas discharged from the upper gas-liquid contact chamber by the heating due to the gas-liquid contact is close to the temperature of the organic waste water supplied to the upper gas-liquid contact chamber by the heat recovery by the gas-liquid contact. It was confirmed that heat could be recovered with very high efficiency.

  As mentioned above, although embodiment of the heating apparatus according to this invention and the organic waste water treatment system provided with this was described, this invention is not limited to this embodiment, and various, without deviating from the scope of the present invention. Deformation or correction is possible.

  For example, in the above-described embodiment, the gas-liquid contact chamber has been described as applied to a heating tank that is arranged in two stages in the vertical direction. The present invention can also be applied to an apparatus having a gas-liquid contact tank arranged in three or more stages in the vertical direction.

  In this heating device, combustion exhaust gas from a gas engine or the like is heated in contact with the liquid to be heated in the form of bubbles, so that the heating efficiency and exhaust heat are higher than those using a heat exchanger. Even if the recovery efficiency is high and the temperature of the combustion exhaust gas is as low as about 70 to 170 ° C., for example, the heat can be recovered and the heated liquid can be heated. Such a heating device can be advantageously applied to recover exhaust heat (sensible heat, latent heat) of combustion exhaust gas after recovering heat with a heat exchanger for exhaust heat recovery. The efficiency can be greatly increased.

  Moreover, in the organic waste water treatment system provided with this warming device, the organic waste water is heated to a temperature suitable for treatment using the exhaust heat of the combustion exhaust gas, so that the treatment of the organic waste water can be promoted. Moreover, since the heating uses the exhaust heat of combustion exhaust gas, the energy saving and operation cost of the processing system can be achieved, and an environmentally friendly processing system can be applied.

It is sectional drawing which shows one Embodiment of the heating apparatus according to this invention. It is a plane sectional view showing the upper gas-liquid contact chamber of the heating device of FIG. It is sectional drawing corresponding to FIG. 2 which shows the heating tank of another form. It is a system diagram which shows simply the anaerobic fermentation processing system as an example of an organic waste water treatment system. It is a system diagram which shows simply the aerobic treatment system as another example of an organic waste water treatment system.

Explanation of symbols

2,2A Heating device 4,4A Heating tank 10 Exhaust gas chamber 12, 12A Lower gas-liquid contact chamber 14, 14A Upper gas-liquid contact chamber 16 Exhaust gas supply pipe 18, 18A Lower ventilation partition wall 20, 20A Upper ventilation Partition wall 26 Communication pipe structure 40, 42 Ventilation slit 102 Gas engine 104 Organic drainage tank 106 Anaerobic fermentation tank 114 Heat exchanger for exhaust heat recovery 116 Exhaust gas supply means 120 Liquid supply means 132 Aerobic treatment tank

Claims (5)

A heating tank for heating the heated liquid, a liquid supply means for supplying the heated liquid to the heating tank, and an exhaust gas for supplying combustion exhaust gas to the heating tank a heating device comprising: a feeding means, and
Said heating tank, comprising an exhaust gas chamber the combustion exhaust gas from the exhaust gas delivery means flows, and a gas-liquid contact chamber to be pressurized heat the liquid from said liquid feed means is fed, the The gas-liquid contact chamber is composed of a lower gas-liquid contact chamber disposed above the exhaust gas chamber and an upper gas-liquid contact chamber disposed above the lower gas-liquid contact chamber, and the exhaust gas A lower ventilation partition wall is provided between the lower gas liquid contact chamber and the lower gas liquid contact chamber, and an upper ventilation partition wall is provided between the lower gas liquid contact chamber and the upper gas liquid contact chamber. And the upper ventilation partition wall is provided with a plurality of ventilation slits extending in an oblique direction,
The heated liquid flows from the upper gas-liquid contact chamber through the lower gas-liquid contact chamber, and the combustion exhaust gas from the exhaust gas chamber is in contact with the lower gas-liquid through the plurality of ventilation slits of the lower ventilation partition wall. A heating device, wherein the heating device is supplied to the chamber in the form of bubbles and then is supplied to the upper gas-liquid contact chamber in the form of bubbles through the plurality of ventilation slits of the upper ventilation partition wall. The lower gas-liquid contact chamber and the upper gas-liquid contact chamber are communicated with each other by a communication pipe structure, and the communication pipe structure has a U-shaped tube portion for storing a liquid to be heated, and one end portion of the U-shaped tube portion. Is communicated with the upper gas-liquid contact chamber, the other end communicates with the lower gas-liquid contact chamber via a connecting pipe portion extending downward, and the other end of the U-shaped tube portion extends upward. The heating apparatus according to claim 1 , wherein the heating apparatus is communicated with the upper gas-liquid contact chamber via a vent pipe. An organic waste water tank for storing an organic waste water, a heating device according to claim 1 or 2, wherein the organic waste water and an anaerobic fermentation tank for anaerobically methane fermentation, for recovering waste heat of the combustion exhaust gases an organic waste water treatment system comprising a heat exchanger, a,
The liquid feeding means of the warming device feeds the organic wastewater in the organic drainage tank to the gas-liquid contact chamber of the warming tank of the warming device, and the organic wastewater from the liquid feeding means The exhaust gas supply means of the heating device flows from the liquid contact chamber through the lower gas-liquid contact chamber and supplies the combustion exhaust gas heat-exchanged in the heat exchanger to the exhaust gas chamber of the heating tank. the combustion exhaust gas from the exhaust gas chamber, the lower gas-liquid contact by passing a plurality of ventilation slits disposed the lower ventilation partition wall between the lower gas-liquid contact chamber and the exhaust gas chamber The bubbles are fed into the chamber in the form of bubbles , and then bubbles are formed in the upper gas-liquid contact chamber through a plurality of ventilation slits in the upper ventilation partition wall disposed between the lower gas-liquid contact chamber and the upper gas-liquid contact chamber. Jo to be delivered, thereby, the organic waste water is warmed to a temperature suitable for anaerobic methane fermentation, then, The organic waste water processing system, characterized in that temperature organic waste water is fed to the anaerobic fermenter. An organic waste water tank for storing an organic waste water, a heating device according to claim 1 or 2, wherein the aerobic treatment tank for performing aerobic treatment of organic wastewater, the combustion exhaust gas waste heat for recovering an organic waste water treatment system comprising a heat exchanger, a,
The liquid feeding means of the warming device feeds the organic wastewater in the organic drainage tank to the gas-liquid contact chamber of the warming tank of the warming device, and the organic wastewater from the liquid feeding means The exhaust gas supply means of the heating device flows from the liquid contact chamber through the lower gas-liquid contact chamber and supplies the combustion exhaust gas heat-exchanged in the heat exchanger to the exhaust gas chamber of the heating tank. the combustion exhaust gas from the exhaust gas chamber, the lower gas-liquid contact through a plurality of vent slits bets disposed the lower ventilation partition wall between the lower gas-liquid contact chamber and the exhaust gas chamber The bubbles are fed into the chamber in the form of bubbles , and then bubbles are formed in the upper gas-liquid contact chamber through a plurality of ventilation slits in the upper ventilation partition wall disposed between the lower gas-liquid contact chamber and the upper gas-liquid contact chamber. Jo to be delivered, thereby, the organic waste water is warmed to a temperature suitable for aerobic treatment, then warmed The organic waste water processing system which is characterized in that the organic waste water is fed to the aerobic treatment tank. The temperature of the combustion exhaust gas fed to the exhaust gas chamber of the heating tank by the exhaust gas feeding means is 70 to 170 ° C., and the combustion exhaust gas in the gas-liquid contact chamber of the heating device and the The organic wastewater treatment system according to claim 3 or 4 , wherein the organic wastewater is heated to 30 to 60 ° C by gas-liquid contact with the organic wastewater.

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