Exhaust heat recovery system and exhaust heat recovery method

Abstract

To provide an exhaust heat recovery system capable of adjusting the amount of recovered water and the amount of recovered heat according to the situation without bypassing exhaust gas. [Solution] The exhaust heat recovery system 1 of the present invention comprises a temperature reduction tower that reduces the temperature of exhaust gas emitted from a waste incinerator by spraying cooling water onto the exhaust gas, a water vapor separation membrane that separates water vapor from the exhaust gas after it passes through the temperature reduction tower, a condensate tank that recovers the water vapor separated by the water vapor separation membrane as condensate, and a control means that controls the amount of recovered heat recovered in the condensate process by adjusting the condensate temperature.

Description

[Technical Field]

[0001] The present invention relates to an exhaust heat recovery system and an exhaust heat recovery method, and more particularly to a technology for recovering moisture contained in combustion exhaust gas emitted from a waste incinerator and realizing efficient exhaust heat recovery. [Background technology]

[0002] A waste incinerator is equipped with a cooling tower that sprays cooling water to cool the combustion exhaust gas generated from the incinerator. Spraying cooling water into the combustion exhaust gas increases the moisture concentration in the combustion exhaust gas, which is undesirable because it condenses the moisture in the exhaust gas when the exhaust gas is discharged from the chimney, producing white smoke. Therefore, in order to reduce the moisture concentration in the exhaust gas, there is a technology that separates water vapor using a water vapor separation membrane (Patent Document 1). However, simply separating water vapor using a water vapor separation membrane does not provide the technical concept of utilizing the separated high-temperature water vapor, and this only increases processing costs.

[0003] Therefore, as a technology that can reduce the cost of exhaust gas treatment while preventing white smoke from the chimney, a technology has been developed in which water vapor recovered using a water vapor separation membrane is converted back into water in a condenser and used as cooling water for an exhaust gas cooling device (Patent Document 2).

[0004] According to the technology described in Patent Document 2, moisture in exhaust gas is separated by a water vapor separation membrane, and the separated water vapor is cooled in a heat exchanger to become condensed water, which is then stored in a condensate tank. The stored condensate is reused as cooling water to be injected into the waste incinerator or as plant water. In addition, the hot water obtained after cooling the water vapor is also used as a heat source for a binary generator.

[0005] In this way, the heat of the separated steam is not wasted, and the thermal efficiency of the entire plant can be increased while suppressing the generation of white smoke.

[0006] In the technology described in Patent Document 2, a water vapor separation membrane for separating and recovering moisture in exhaust gas is provided with a bypass passage for the exhaust gas, and the amount of water vapor to be separated and recovered is controlled by adjusting the amount of exhaust gas passing through the water vapor separation membrane and the amount of exhaust gas passing through the bypass passage with a damper, thereby controlling the amount of recovered water and heat.

[0007] As described in Patent Document 2, controlling the amount of water vapor recovered by changing the amount of flue gas passing through the water vapor separation membrane requires ducts and dampers. This requires control of not only the amount of flue gas passing through the water vapor separation membrane but also the condenser, which makes the system complicated and undesirably increases costs. In particular, the ducts and dampers for the flue gas are prone to contamination and corrosion, which increases costs. Furthermore, increasing the amount of bypassed flue gas increases the moisture concentration in the flue gas discharged from the chimney, potentially causing white smoke. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Patent No. 4074826 [Patent Document 2] Patent No. 6915873 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention has been made in consideration of these problems, and aims to provide an exhaust heat recovery system that can adjust the amount of recovered water and recovered heat according to the situation without bypassing the exhaust gas. [Means for solving the problem]

[0010] The inventors of the present invention discovered that by adjusting the temperature at which the separated and recovered water vapor is condensed into condensed water, it is possible to adjust the vapor pressure on the recovery side of the water vapor separation membrane, and as a result, it is possible to control the amount of recovered water and the amount of recovered heat, and thus arrived at the present invention.

[0011] The present invention provides the following solutions.

[0012] The exhaust heat recovery system according to the first feature includes a cooling tower that reduces the temperature of exhaust gas discharged from a waste incinerator by spraying cooling water onto the exhaust gas, a water vapor separation membrane that separates water vapor from the exhaust gas after passing through the cooling tower, a condensate tank that recovers the water vapor separated by the water vapor separation membrane as condensate, and a control means that controls the amount of recovered heat recovered in the condensate process by adjusting the condensate temperature.

[0013] According to the first aspect of the present invention, a water vapor separation membrane is provided to separate water vapor from the exhaust gas after passing through the cooling tower, thereby suppressing the generation of white smoke from the chimney. The water vapor separated and recovered using the water vapor separation membrane is saturated when it flows into the condensate tank as condensate. Therefore, once the condensate temperature, which is the temperature at which the water vapor flows into the condensate tank, is determined, the saturated vapor pressure at that time becomes the steam pressure. In other words, the steam pressure on the recovery side of the water vapor separation membrane can be adjusted by adjusting the condensate temperature. Furthermore, with a water vapor separation membrane, the amount of recovered water changes depending on the pressure difference between the steam pressure on the inlet side and the steam pressure on the recovery side. Therefore, adjusting the condensate temperature leads to adjusting the pressure difference between the inlet side and the recovery side of the water vapor separation membrane, and as a result, the amount of recovered heat and the amount of recovered water can be controlled when recovering water vapor as condensate.

[0014] The exhaust heat recovery system according to the second feature is the exhaust heat recovery system according to the first feature, and is provided with a heat exchanger between the water vapor separation membrane and the condensate tank for cooling the water vapor separated by the water vapor separation membrane, and the condensate temperature is adjusted by adjusting the amount of heat exchange in the heat exchanger.

[0015] According to the second aspect of the invention, a heat exchanger is provided between the water vapor separation membrane and the condensate tank to cool the water vapor separated by the water vapor separation membrane, and the condensate temperature is adjusted by adjusting the heat exchange amount in the heat exchanger.Therefore, simply by adjusting the heat exchange amount in the heat exchanger, the steam pressure on the recovery side of the water vapor separation membrane can be adjusted, and as a result, the amount of recovered heat and water can be controlled when recovered as condensate.

[0016] The exhaust heat recovery system according to the third feature is the exhaust heat recovery system according to the second feature, and is provided with a bypass circuit that runs from the steam separation membrane to the condensate tank, bypassing the heat exchanger, and a damper that adjusts the flow rate of water vapor passing through the bypass circuit, and adjusts the amount of heat exchange by adjusting the opening of the damper.

[0017] According to the third aspect of the present invention, a bypass circuit is provided that runs from the water vapor separation membrane to the condensate tank, bypassing the heat exchanger, and a damper is provided to adjust the flow rate of water vapor passing through the bypass circuit. The amount of heat exchange is adjusted by adjusting the opening of the damper. Therefore, simply adjusting the opening of the damper in the water vapor flow path makes it possible to adjust the steam pressure on the recovery side of the water vapor separation membrane, thereby controlling the amount of recovered heat and water when recovering as condensate. Because there is no need to use a large bypass circuit or damper in the combustion exhaust gas flow path, the amount of recovered water and heat can be controlled with a small-scale, inexpensive configuration. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide an exhaust heat recovery system that is capable of adjusting the amount of recovered water and the amount of recovered heat according to the situation without bypassing the exhaust gas. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic diagram showing an exhaust heat recovery system 1 according to this embodiment. [Figure 2] FIG. 2 is a flowchart showing the procedure of the exhaust heat recovery method performed by the exhaust heat recovery system 1 according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following describes embodiments of the present invention with reference to the accompanying drawings. However, these are merely examples, and the technical scope of the present invention is not limited to these examples.

[0021] [Overall configuration of exhaust heat recovery system 1] The overall configuration of an exhaust heat recovery system 1 according to this embodiment will be described with reference to FIG.

[0022] As shown in Figure 1, the exhaust heat recovery system 1 of this embodiment is composed of a waste incinerator 10, an exhaust heat recovery boiler 20, a cooling tower 30, a bag filter 40, an induced draft fan 50, a water vapor separation membrane 60, a condenser 70, a chimney 80, and a control device (not shown).

[0023] The waste incinerator 10 is used to incinerate waste such as amorphous general waste, industrial waste, and infectious medical waste packaged in a specified shape, and any type of incinerator can be used, such as a stoker type, fluidized bed type, or vertical type.

[0024] The heat recovery boiler 20 generates steam by recovering exhaust heat from the high-temperature combustion exhaust gas generated when waste is incinerated in the waste incinerator 10 and heating the boiler feed water. The heat recovery boiler 20 is composed of a steam drum that separates the steam generated by heating the boiler feed water in a heat transfer tube through which the boiler feed water flows into steam, a superheater that further superheats the steam, and an evaporation amount detection means that detects the evaporation amount of the steam generated from the heat recovery boiler 20, but the type is not limited to this.

[0025] The temperature reducing tower 30 further cools the flue gas whose temperature has been reduced in the heat recovery boiler 20 by spraying cooling water onto it. By spraying cooling water onto the flue gas in the temperature reducing tower 30, the temperature of the flue gas decreases while the moisture concentration in the flue gas increases.

[0026] The bag filter 40 filters the cooled combustion exhaust gas to remove soot and harmful components contained in the combustion exhaust gas, and is equipped with a filter cloth for removing soot and harmful components. An agent supplying device (not shown) for injecting an agent into the bag filter 40 is disposed in the exhaust gas flue at the inlet of the bag filter 40. The alkaline agent supplied from the agent supplying device neutralizes with the acidic components in the combustion exhaust gas on the filter cloth of the bag filter 40, thereby purifying the combustion exhaust gas. In this embodiment, a sodium-based agent is used as the alkaline agent supplied from the agent supplying device.

[0027] The induced draft fan 50 is a fan disposed downstream of the bag filter 40, and serves to suck in the exhaust gas purified by the bag filter 40 and release the exhaust gas into the atmosphere through the chimney 80. In this embodiment, two induced draft fans 50 are provided: one provided in a path passing through the water vapor separation membrane 60, and the other provided in a path bypassing the water vapor separation membrane 60. The path bypassing the water vapor separation membrane 60 is used for maintenance or replacement of the water vapor separation membrane 60, and is not used to control the amount of heat recovered by the water vapor.

[0028] The water vapor separation membrane 60 selectively separates and recovers water vapor from the combustion exhaust gas purified by the bag filter 40, and separates water vapor by utilizing the difference in vapor pressure between the inlet side and the recovery side separated by the membrane. With the water vapor separation membrane 60, the greater the difference in vapor pressure between the inlet side and the recovery side separated by the membrane, the more water vapor can be recovered, and the smaller the difference in vapor pressure between the inlet side and the recovery side, the less water vapor can be recovered. The temperature of the water vapor separated and recovered by the water vapor separation membrane 60 is approximately 200°C.

[0029] The condenser 70 cools the steam back to water, and includes a first heat exchanger 71, a second heat exchanger 72, a bypass circuit 73, a damper 74, a condensate tank 75, and a cooling tower 76.

[0030] The first heat exchanger 71 is a heat exchanger for recovering heat from the water vapor at about 200°C that has been separated and recovered by the water vapor separation membrane 60. The heat recovered by the first heat exchanger 71 is at a relatively high temperature, and is therefore used, for example, as a heat source for regenerating the absorbing liquid in an absorption chiller, or for other heat uses.

[0031] The second heat exchanger 72 is a heat exchanger installed in the path from the first heat exchanger 71 to the condensate tank 75, and is a heat exchanger for further cooling and condensing the water vapor cooled in the first heat exchanger 71 to form condensed water, and is also able to recover latent heat in the condensate pressure. Note that, although cooling water supplied from the cooling tower 76 is used as the refrigerant for the second heat exchanger 72 in this embodiment, the present invention is not limited to this, and any refrigerant that can cool and condense water vapor may be used.

[0032] The bypass circuit 73 is a path from the first heat exchanger 71 to the condensate tank 75 that bypasses the second heat exchanger 72 and supplies the condensate to the condensate tank 75 without cooling it.

[0033] The damper 74 is installed in the bypass circuit 73 and serves to adjust the amount of steam passing through the bypass circuit 73 and the amount of steam flowing into the second heat exchanger 72, and adjusts the flow rate by adjusting the opening degree. The damper 74 may be installed at two locations: the bypass circuit 73 and the inlet of the second heat exchanger 72.

[0034] The condensate tank 75 is a tank for storing condensate that has been cooled and condensed in the second heat exchanger 72 and / or the first heat exchanger 71. In the present invention, the condensate temperature refers to the temperature of the condensate that has been cooled and condensed in the second heat exchanger 72 and / or the first heat exchanger 71 when it flows into the condensate tank 75. The condensate stored in the condensate tank 75 is then used as water supply for various plant uses, as cooling water in the cooling tower 30, or as make-up water for the cooling tower 76.

[0035] The cooling tower 76 sends the condensate supplied as makeup water from the condensate tank 75 to the second heat exchanger 72 as cooling water, and cools the high-temperature cooling water returned from the second heat exchanger 72 with air.

[0036] A control device (not shown) controls the amount of recovered heat and water depending on the situation by adjusting the opening of the damper 74. The control device also controls each part of the system based on physical quantities measured by various measuring devices (not shown).

[0037] [Waste heat recovery method in waste heat recovery system 1] Next, the flow of the exhaust heat recovery method using the exhaust heat recovery system 1 according to this embodiment will be described with reference to Fig. 2. Fig. 2 is a flow diagram showing the exhaust heat recovery method using the exhaust heat recovery system 1 according to this embodiment. It is assumed that the temperature inside the waste incinerator 10 has already risen to a temperature sufficient for incinerating waste and is in a steady operating state.

[0038] [Step S110: Exhaust heat recovery (steam generation)] High-temperature combustion exhaust gas is generated by incinerating waste in the waste incinerator 10. Exhaust heat is recovered from the high-temperature combustion exhaust gas generated in the waste incinerator 10 in the waste heat recovery boiler 20 to heat boiler feedwater and generate steam (step S110).

[0039] [Step S120: Decreasing the temperature of the combustion exhaust gas] The combustion exhaust gas from which the exhaust heat has been recovered in the exhaust heat recovery boiler 20 in step S110 is sprayed with cooling water in the cooling tower 30 and cooled to 200° C. or less (step S120).

[0040] [Step S130: Purification of Combustion Exhaust Gas] The combustion exhaust gas that has been cooled to 200°C or less in the temperature reducing tower 30 in step S120 is purified by the bag filter 40 (step S130).

[0041] In this embodiment, a precoated bag filter is used as the bag filter 40. A sodium-based chemical (for example, finely pulverized sodium bicarbonate or porous sodium carbonate) is supplied for a predetermined period of time to form a reaction layer of the sodium-based chemical on the surface of the filter cloth. By using a sodium-based chemical as a neutralizing agent, acidic gases such as hydrogen chloride and sulfur oxides can be efficiently neutralized even in the relatively high exhaust gas temperature range of 200°C.

[0042] Furthermore, by using a precoated bag filter as the bag filter 40, acidic gases contained in the combustion exhaust gas are neutralized by the precoated reactive layer, and the salts produced are captured by the filter cloth. Similarly, soot and dust contained in the combustion exhaust gas are also captured by the filter cloth. The use of a precoated bag filter improves the reaction rate between the chemical and the acidic components, allowing for sufficient reaction with a small amount of chemical, and reducing the amount of dust discharged from the bag filter after the filter cloth is cleaned.

[0043] The type of the bag filter 40 is not limited to a precoated bag filter, but may be a type in which a sodium-based chemical is blown into the inlet of the bag filter 40.

[0044] In this way, by purifying exhaust gases using a bag filter that uses a sodium-based agent, the concentrations of hydrogen chloride and sulfur oxides are reduced to 10 ppm or less.

[0045] [Step S140: Separation of Water Vapor] The combustion exhaust gas purified in step S130 flows downstream by the induced draft fan 50 and passes through the water vapor separation membrane 60, whereby the water vapor in the combustion exhaust gas is selectively separated (step S140). At this time, the combustion exhaust gas does not separate through the water vapor separation membrane 60, and substantially all of the combustion exhaust gas passes through the water vapor separation membrane 60, and the water vapor contained in substantially all of the combustion exhaust gas is separated. The amount of water vapor separated by the water vapor separation membrane 60 is determined by the condensation temperature, as will be described later.

[0046] Here, the combustion exhaust gas that passes through the water vapor separation membrane 60 has had soot and dust removed and acidic gases neutralized by the bag filter 40, and the moisture concentration is increased, so water vapor can be separated and recovered efficiently. Furthermore, since the combustion exhaust gas that has passed through the water vapor separation membrane 60 has had water vapor separated from it, it is discharged from the chimney 80 while preventing white smoke from being generated.

[0047] [Step S150: Condensation of water vapor] The water vapor separated from the combustion exhaust gas by passing through the water vapor separation membrane 60 flows into the first heat exchanger 71 and the second heat exchanger 72, where it is cooled by exchanging heat with the refrigerant. The cooled water vapor condenses and flows into the condensate tank 75 (step S150).

[0048] The water vapor having a temperature of about 200°C separated from the combustion exhaust gas by the water vapor separation membrane 60 is first cooled in the first heat exchanger 71 to become steam at about 100 to 120°C. The refrigerant that has exchanged heat with the high-temperature water vapor in the first heat exchanger 71 has an increased temperature, and is therefore used as a heat source for an absorption refrigerator or for other heat utilization purposes.

[0049] The water vapor cooled in the first heat exchanger 71 to a temperature of about 100 to 120°C is further cooled and condensed in the second heat exchanger 72. Here, a control device (not shown) adjusts the opening of the damper 74 to adjust the balance between the flow rate of water vapor flowing into the second heat exchanger 72 and the flow rate of water vapor bypassing the second heat exchanger 72, thereby controlling the temperature of the condensate flowing into the condensate tank 75. By controlling the temperature of the condensate flowing into the condensate tank 75, the vapor pressure on the recovery side of the water vapor separation membrane can be adjusted, and as a result, the amount of water recovered and the amount of heat recovered when recovered as condensate can be controlled.

[0050] That is, if it is desired to increase the amount of recovered water, the condensate temperature is lowered to about 60°C and the steam pressure on the outlet side (i.e., the recovery side) of the water vapor separation membrane 60 is reduced to increase the pressure difference with the inlet side, thereby increasing the amount of recovered water. To achieve this, a control device (not shown) adjusts the damper 74 to increase the flow rate of water vapor flowing into the second heat exchanger 72 and increase the amount of heat exchanged. In this way, the amount of heat recovered from the water vapor in the second heat exchanger 72 can be increased, and a larger amount of condensate at a lower temperature can be obtained.

[0051] On the other hand, if high-temperature condensate is desired, the condensate temperature can be raised to 80°C or higher, for example, and the steam pressure of the water vapor separation membrane 60 can be increased to reduce the pressure difference with the inlet side, thereby reducing the amount of recovered water and obtaining a small amount of high-temperature condensate. To achieve this, the control device adjusts the damper 74 to reduce the flow rate of water vapor flowing into the second heat exchanger 72 and increase the flow rate of water vapor bypassing the second heat exchanger 72, thereby reducing the amount of heat exchanged. In this way, the amount of heat recovered from the water vapor in the second heat exchanger 72 can be reduced, and a small amount of condensate at a higher temperature can be obtained. If the condensate temperature is set to 80°C or higher, the amount of recovered water decreases, but cold energy sufficient for binary power generation and ice making can be obtained.

[0052] Furthermore, by ensuring that the water vapor separation membrane 60 has a membrane area large enough to maintain a condensate temperature of 80°C or higher and secure the amount of water required for plant use, the condensate temperature can be lowered in the event of a disaster, and the increased amount of condensate can be supplied to the outside as domestic water. At this time, the control device adjusts the damper 74 to increase the flow rate of water vapor flowing into the second heat exchanger 72, further increasing the heat exchange rate. In this way, a large amount of condensate that is not very hot can be obtained.

[0053] In this way, simply by adjusting the temperature at which the water vapor separated from the combustion exhaust gas by the water vapor separation membrane 60 is recovered in the condensate tank 75, the steam pressure on the recovery side of the water vapor separation membrane 60 can be adjusted, and as a result, the amount of recovered heat and the amount of recovered water when recovered as condensate can be controlled. That is, the water vapor separated and recovered using the water vapor separation membrane is saturated when it flows into the condensate tank. Therefore, once the condensate temperature, which is the temperature at which the water vapor flows into the condensate tank, is determined, the saturated vapor pressure at that time becomes the pressure of the steam. In other words, the steam pressure on the recovery side of the water vapor separation membrane can be adjusted by adjusting the condensate temperature. Furthermore, with a water vapor separation membrane, the amount of recovered water changes depending on the pressure difference between the steam pressure on the inlet side and the steam pressure on the recovery side. Therefore, adjusting the condensate temperature leads to adjusting the pressure difference between the inlet side and the recovery side of the water vapor separation membrane, and as a result, the amount of recovered heat and the amount of recovered water when recovering water as condensate can be controlled.

[0054] In addition, a second heat exchanger 72 is provided between the water vapor separation membrane 60 and the condensate tank 75 to cool the water vapor separated by the water vapor separation membrane 60, and the condensate temperature is adjusted by adjusting the heat exchange amount in the second heat exchanger 72.Therefore, the steam pressure on the recovery side of the water vapor separation membrane 60 can be adjusted simply by adjusting the heat exchange amount in the second heat exchanger 72, and as a result, the amount of recovered heat and water can be controlled when recovered as condensate.

[0055] The system also includes a bypass circuit 73 that runs from the water vapor separation membrane 60 to the condensate tank 75, bypassing the second heat exchanger 72, and a damper 74 that adjusts the flow rate of water vapor passing through the bypass circuit 73. The heat exchange amount is adjusted by adjusting the opening of the damper 74, so that the steam pressure on the recovery side of the water vapor separation membrane 60 can be adjusted simply by adjusting the opening of the damper 74 in the water vapor flow path, and as a result, the amount of recovered heat and water can be controlled when recovered as condensate. Since there is no need to use a large bypass circuit or damper in the combustion exhaust gas flow path, the amount of recovered water and heat can be controlled with a small-scale, inexpensive configuration.

[0056] In the above description, the heat exchange amount in the heat exchanger is used as a means for adjusting the condensate temperature, but this is not limiting. For example, any means can be used as long as it can adjust the temperature of the condensate as it flows into condensate tank 75, such as a means for adjusting the condensate temperature by mixing water or steam with the condensate.

[0057] Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments. Furthermore, the effects described in the embodiments of the present invention are merely a list of the most preferable effects resulting from the present invention, and the effects of the present invention are not limited to those described in the embodiments of the present invention.

[0058] Furthermore, the above-described embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to an embodiment having all of the configurations described. [Industrial Applicability]

[0059] The exhaust heat recovery system of the present invention can be applied to all waste incineration facilities that incinerate various types of waste. [Explanation of symbols]

[0060] 1. Waste heat recovery system 10. Waste incinerator 20 Waste heat recovery boiler 30 Cooling tower 40 Bag filter 50 Induced draft fan 60 Water vapor separation membrane 70 Condenser 71 First heat exchanger 72 Second heat exchanger 73 Bypass circuit 74 Damper 75 Condensate Tank 76 Cooling Tower 80 Chimney

Claims

1. a cooling tower that cools the combustion exhaust gas emitted from the waste incinerator by spraying cooling water onto it; a water vapor separation membrane that selectively separates water vapor from the combustion exhaust gas after passing through the cooling tower; a means for cooling and condensing the water vapor separated by the water vapor separation membrane; a condensate tank for collecting the condensed water; a control means for controlling the amount of heat recovered in the process of condensing the water by adjusting the condensate temperature; An exhaust heat recovery system equipped with:

2. a heat exchanger for cooling the water vapor separated by the water vapor separation membrane between the water vapor separation membrane and the condensate tank; The condensate temperature is adjusted by adjusting the heat exchange amount in the heat exchanger. The exhaust heat recovery system according to claim 1 .

3. a bypass circuit that runs from the water vapor separation membrane to the condensate tank, bypassing the heat exchanger; a damper for adjusting the flow rate of water vapor passing through the bypass circuit, The amount of heat exchange is adjusted by adjusting the opening degree of the damper. The exhaust heat recovery system according to claim 2 .

4. A step of reducing the temperature of exhaust gas discharged from the waste incinerator by spraying cooling water onto the exhaust gas; Separating water vapor from the exhaust gas after the temperature has been reduced; cooling and condensing the separated water vapor; recovering the condensed water; a step of controlling the amount of heat recovered in the process of condensing the water by adjusting the condensate temperature; A waste heat recovery method comprising:

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