KR101861511B1 - Cogeneration system - Google Patents

Abstract

An exhaust gas line 5 through which the exhaust gas EG discharged from the incinerator 2 flows, a power generator 3 which generates electricity by using the thermal oil HO as a heat source, A first heat exchanger 6 for exchanging heat between the exhaust gas EG and the heating oil HO supplied to the power generation apparatus 3 and a second heat exchanger 6 formed in parallel with the first heat exchanger 6 in the exhaust gas line 5, An air preheater 7 for exchanging heat between the exhaust gas EG and the air A1 supplied to the incinerator and an exhaust gas EG heat exchanged in the first heat exchanger 6 and the air preheater 7, The exhaust gas EG which is formed on the upstream side of the dust collecting device 14 in the exhaust gas line 5 and is heat-exchanged in the first heat exchanger 6 and the air preheater 7, And a second heat exchanger (8) that performs heat exchange between the thermal oil (HO) supplied to the heat exchanger (6) The.

Description

Cogeneration system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste heat power generation system for generating power using waste heat of an incinerator.

Priority is claimed on Japanese Patent Application No. 2015-251539, filed on December 24, 2015, the contents of which are incorporated herein by reference.

In the sludge incineration plant for treating sludge such as sewage sludge, the combustion air supplied to the incinerator is preheated by using the waste heat of the incinerator, or the steam generated in the boiler for recovering the waste heat is used for power generation. Thus, the sludge incineration plant improves the heat utilization rate of the entire plant (see, for example, Patent Document 1).

In such a sludge incineration plant, it is common to form a dust collecting device for collecting the exhaust gas discharged from the incinerator. In such a sludge incineration plant, the temperature of the exhaust gas flowing into the dust collecting apparatus is adjusted based on the heat resistance temperature of the dust collecting apparatus. Conventionally, water is sprayed from the exhaust gas cooling tower to the exhaust gas introduced into the dust collecting apparatus, and the temperature is adjusted to, for example, about 200 캜.

Japanese Laid-Open Patent Publication No. 2013-155974

Incidentally, it is not preferable that the temperature is adjusted by spraying water against the exhaust gas since the heat is discarded as a result. It is also possible to perform temperature control by mixing air or the like with the exhaust gas introduced into the dust collecting apparatus. However, this method is also undesirable because, as with the exhaust gas cooling tower, the heat is consequently discarded. In addition, a large amount of air is required, and it is necessary to increase the capacity of the apparatus in order to cope with a considerable increase in the amount of gas.

There is a method of installing a gas type air preheater and performing temperature control but there is a problem that the heat transfer pipe of the gas type air preheater tends to become a low temperature corrosion station.

An object of the present invention is to provide a waste heat power generation system that generates electricity by using waste heat of an incinerator, and that has a higher heat utilization rate.

According to a first aspect of the present invention, a waste heat generation system includes an incinerator, an exhaust gas line through which exhaust gas discharged from the incinerator flows, a power generator that generates power using heat energy as a heat source, An air preheater formed in parallel with the first heat exchanger in the exhaust gas line for exchanging heat between the exhaust gas and air supplied to the incinerator, and a second heat exchanger And an air preheater, wherein the air preheater is provided with a dust collecting device for removing a solid component from the exhaust gas heat-exchanged in the air preheater, and a dust collecting device formed on an upstream side of the dust collecting device in the exhaust gas line, A second heat exchanger that exchanges heat between the exhaust gas and the fuel oil supplied to the first heat exchanger .

According to such a configuration, by reducing the temperature of the exhaust gas introduced into the dust collecting apparatus by using the second heat exchanger, as compared with, for example, reducing the temperature of the exhaust gas by using the exhaust gas cooling tower, Can be utilized.

In the waste heat power generation system, a control device may be provided for adjusting the flow rate of the heat oil heat-exchanged in the second heat exchanger based on the temperature of the exhaust gas discharged from the second heat exchanger.

According to such a configuration, the flow rate of the heat oil is adjusted and the temperature of the exhaust gas is adjusted, so that the temperature of the exhaust gas can be set to a temperature corresponding to the heat resistance temperature of the dust collecting apparatus.

The waste heat generation system according to any one of claims 1 to 3, wherein the waste heat recovery system comprises: a heat oil circulation path through which the heat energy is circulated; and a second heat exchanger that bypasses the upstream side of the second heat exchanger and the downstream side of the second heat exchanger And the control device may adjust the flow rate of the oil flowing through the bypass path.

It is possible to adjust the temperature of the exhaust gas more quickly by adjusting the temperature of the exhaust gas flowing into the dust collecting apparatus by the flow rate of the heat of oil introduced into the second heat exchanger disposed on the upstream side of the dust collecting apparatus.

In the cogeneration system, the flow rate of the oil to be supplied to the power generation apparatus may be adjusted based on the temperature of the heat of the heat-exchanged oil in the first heat exchanger.

According to this configuration, the temperature of the fruit oil can be adjusted to a temperature suitable for the power generation apparatus. It is also possible to cope with the temperature rise of the exhaust gas when the temperature (heat amount) of the exhaust gas discharged from the incinerator is greatly increased. Further, it is possible to cope with the temperature decrease of the exhaust gas when the temperature (heat amount) of the exhaust gas discharged from the incinerator is greatly reduced.

In the waste heat power generation system, the white smoke prevention device may include a white smoke prevention device that heats the outside air discharged from the second heat exchanger and passed through the dust collecting device to the smokestack.

According to this configuration, as compared with, for example, the case where the white smoke prevention device is provided on the upstream side of the second heat exchanger, the heat is recovered from the exhaust gas at a low temperature, so that the heat recovery rate of the entire system can be improved .

According to the present invention, by reducing the temperature of the exhaust gas introduced into the dust collecting apparatus by using the second heat exchanger, as compared with, for example, using the exhaust gas cooling tower to reduce the temperature of the exhaust gas, .

1 is a schematic diagram of a sludge incineration plant according to an embodiment of the present invention.
2 is a flow chart for explaining a first control method of a sludge incineration plant of an embodiment of the present invention.
3 is a flow chart for explaining a second control method of the sludge incineration plant of the embodiment of the present invention.

Hereinafter, the sludge incineration plant 1 which is a waste heat generating system according to the embodiment of the present invention will be described in detail with reference to the drawings.

1, the sludge incineration plant 1 of the present embodiment includes an incinerator 2 for incinerating a sludge S such as sewage sludge, and a waste heat generator for generating waste heat of the exhaust gas EG discharged from the incinerator 2, A power generation device 3 for generating electric power by use of an incineration heat (incineration heat), and a control device 4. The sludge incineration plant 1 of the present embodiment is a cogeneration system for incinerating sludge S and recovering heat generated by incineration to generate electricity. The power generation device 3 uses the thermal oil (HO) circulating the plant as the heat medium.

The sludge incineration plant 1 comprises an exhaust gas line 5 into which exhaust gas EG discharged from the incinerator 2 is introduced, a first heat exchanger 6 formed on the exhaust gas line 5, An air preheater 7 formed in parallel with the first heat exchanger 6 in the gas line 5 and a second heat exchanger 8 formed on the downstream side of the first heat exchanger 6 and the air preheater 7, And an exhaust gas treatment device 9 formed on the downstream side of the second heat exchanger 8. [

A sludge dryer for drying the dehydrated sludge containing sludge containing water at the upstream side of the incinerator 2 may be formed. The sludge dryer is a device for producing dried sludge (for example, a water content of 50%) by drying dehydrated sludge (dehydrated cake, for example, water content 72%) introduced through a reduction process of concentration and dehydration to be.

The first heat exchanger 6 and the second heat exchanger 8 perform heat exchange for heating the exhaust gas EG discharged from the incinerator 2 and the boiler oil HO supplied to the power generator 3 . The air preheater 7 is a heat exchanger for heat-exchanging (preheating) the exhaust gas EG discharged from the incinerator 2 and the combustion air A1 supplied to the incinerator 2.

The exhaust gas treatment device 9 includes a dust collecting device 14 (bag filter) for removing solid components (ashes and the like) from the exhaust gas EG and performing a dust collecting treatment, a white smoke preventing device 15, A scrubber 16 (exhaust gas cleaning device) which makes the detergent liquid come into contact with the exhaust gas EG and makes the detoxification harmless and a chimney 17 that discharges the treated exhaust gas EG to the atmosphere.

The power generation apparatus 3 includes a power generation apparatus main body 11 and a thermal energy circulation path 12 (see FIG. 1) which is an annular heat source system for introducing the thermal energy HO into the power generation apparatus main body 11, Indicated by two-dot chain line). The fuel oil circulation path 12 is a path for circulating the fuel oil HO between the power generator main body 11 and the first heat exchanger 6 and the second heat exchanger 8. [ In the thermal oil circulation path 12, the thermal oil HO flows in one direction.

The incinerator (2) is a facility for incinerating sludge (S) by stirring and mixing in a high-temperature fluidized bed. The incinerator 2 may be an incinerator that incinerates the waste and discharges the high-temperature exhaust gas (EG). As the incinerator 2, an incinerator such as a bubble-type flow furnace or a circulation type flow furnace can be employed.

The combustion air A1 (flowing air) is introduced into the incinerator 2 through the combustion air line 13 (indicated by the one-dot chain line in Fig. 1). The exhaust gas (EG) is discharged from the incinerator (2) through the first exhaust gas line (5a). The temperature of the exhaust gas EG discharged from the incinerator 2 is, for example, 850 占 폚.

The first exhaust gas line 5a branches to two second exhaust gas lines 5b (5b1, 5b2) formed in parallel on the downstream side. One of the second exhaust gas lines 5b1 is connected to the first heat exchanger 6. [ The first heat exchanger (6) is formed on the second exhaust gas line (5b1) on the thermal oil circulation path (12). The first heat exchanger 6 functions as a heating device for heating the hot oil HO by recovering the heat of the high temperature exhaust gas EG flowing through the second exhaust gas line 5b1.

And the other second exhaust gas line 5b2 is connected to the air preheater 7. The air preheater 7 recovers the heat of the high temperature exhaust gas EG flowing through the second exhaust gas line 5b2 to heat the combustion air A1 flowing through the combustion air line 13, to be.

The first heat exchanger (6) and the air preheater (7) are formed in parallel in the exhaust gas line (5).

The two second exhaust gas lines 5b join downstream of the first heat exchanger 6 and the air preheater 7. The two second exhaust gas lines 5b are connected to the third exhaust gas line 5c. The second heat exchanger 8 is formed on the downstream side of the first heat exchanger 6 and the air preheater 7, that is, on the third exhaust gas line 5c. The second heat exchanger 8 functions as a heating device for heating the heating oil HO by recovering the heat of the exhaust gas EG heat-exchanged in the first heat exchanger 6 and the air preheater 7.

Next, a description will be given of an exhaust gas processing device 9 that removes dust, SO ₂ , HCl, and the like contained in the exhaust gas EG discharged from the incinerator 2 to obtain a cleaned exhaust gas.

The dust collecting device 14 formed on the downstream side of the second heat exchanger 8 is a device for collecting and collecting solid components such as solder and ashes in exhaust gas (EG) by using a filter cloth having heat resistance or the like. That is, the exhaust gas EG discharged from the second heat exchanger 8 and introduced into the dust collector 14 through the fourth exhaust gas line 5d is removed from the exhaust gas EG.

In the dust collector 14, the heat-resistant temperature is set to the temperature of the exhaust gas EG to be introduced. The heat-resistant temperature of the dust collector 14 is, for example, 220 占 폚.

The white smoke prevention device 15 formed in the exhaust gas line 5 on the downstream side of the dust collecting device 14 is a device for preventing the exhaust gas EG from becoming white. The white smoke prevention device 15 includes an air supply fan 19 for sucking in and exhausting the air A2 and an exhaust gas EG which is introduced through the fifth exhaust gas line 5e in the dust collector 14 and air A2 An air heater 20 for heating the air A2 to mix air A3 and a mixing air line 21 for introducing the mixing air A3 to the chimney 17 Respectively.

As the air heater 20 of the white smoke prevention device 15, for example, a shell and tube type heat exchanger may be employed. The heat transfer pipe of the air heater 20 is covered with, for example, Teflon (registered trademark) internal material. In other words, on the exhaust gas contacting surface of the air heater 20, a corrosion resistant layer of Teflon is formed. That is, the air heater 20 of the present embodiment has a low temperature corrosion prevention type heat transfer tube.

Thereby, the corrosion of the metal surface of the heat transfer pipe is suppressed, and the low temperature corrosion is prevented. The treatment for preventing the white smoke prevention device 15 from being a low-temperature corrosion-resistant type is not limited to the Teflon described above. For example, a nonmetallic material such as a resin may be employed. It is also possible to form the heat transfer pipe itself by an inner material such as ceramic.

The scrubber 16 brings the cleaning liquid such as water and a caustic soda aqueous solution into contact with the exhaust gas EG discharged from the white smoke prevention device 15 and introduced through the sixth exhaust gas line 5f, Cleaning device.

The exhaust gas (EG) in the exhaust gas line (5) is sucked by an induction blower (not shown) and discharged through the chimney (17).

The exhaust gas EG flowing through the fourth exhaust gas line 5d is introduced into the fourth exhaust gas line 5d connecting the second heat exchanger 8 and the dust collector 14 in the exhaust gas line 5, An exhaust gas temperature measuring device 18 for measuring the temperature of the exhaust gas is formed. The exhaust gas temperature measuring device 18 measures the temperature of the exhaust gas EG flowing into the dust collecting device 14. [ The temperature of the exhaust gas (EG) measured by the exhaust gas temperature measuring device (18) is transmitted to the control device (4).

Next, details of the power generation device 3 of the present embodiment will be described.

The power generation apparatus main body 11 is a so-called binary type power generation system in which the waste heat of the incinerator 2 is used as a heat source, the organic working medium M is heated and evaporated, and the steam is used to rotate the steam turbine 23, Waste heat generation system (organic Rankine cycle cogeneration system).

The power generation apparatus main body 11 of the present embodiment is configured to heat and evaporate the organic working medium M using the heat of the heating oil HO supplied to the power generation apparatus main body 11 through the heat oil circulation path 12 A steam turbine 23 rotated by the steam of the organic working medium M and a generator 24 connected directly to the steam turbine 23 and an organic operation And a condenser (25) for condensing the medium (M).

The thermal oil circulation path 12 recovers the heat of the exhaust gas EG flowing through the third exhaust gas line 5c and the heat of the exhaust gas EG flowing through the second exhaust gas line 5b1 It is the path to recover.

The thermal oil circulation path 12 includes a first circulation path 12a for connecting the power generator main body 11 and the second heat exchanger 8 and a second circulation path 12b for connecting the second heat exchanger 8 and the first heat exchanger 6, And a third circulation path 12c connecting the first heat exchanger 6 and the power generator main body 11. The second circulation path 12b connects the first heat exchanger 6 and the power generator main body 11 to each other.

The heating oil HO heating the organic working medium M in the power generating apparatus main body 11 circulates in the order of the second heat exchanger 8 and the first heat exchanger 6. [ The first heat exchanger (6) is formed on the downstream side of the second heat exchanger (8) in the heat transfer oil circulation path (12).

The hot oil HO introduced into the second heat exchanger 8 through the first circulation path 12a is heated by the exhaust gas EG flowing through the third exhaust gas line 5c. The hot oil HO introduced into the first heat exchanger 6 through the second circulation path 12b is heated by the exhaust gas EG flowing through the second exhaust gas line 5b1. The heating fluid HO heated by the second heat exchanger 8 and the first heat exchanger 6 is introduced into the evaporator 22 of the power generator main body 11 through the third circulation path 12c.

The first circulation path 12a on the upstream side of the second heat exchanger 8 and the second circulation path 12b on the downstream side of the second heat exchanger 8 are connected to the second heat exchange And is connected directly by bypassing the base 8. That is, a part of the fuel oil HO flowing through the first circulation path 12a is introduced into the bypass path 27b without being introduced into the second heat exchanger 8. [

A first flow rate adjusting valve 29 for adjusting the flow rate of the thermal oil HO is provided between the branch point 28 of the bypass path 27b formed in the first circulation path 12a and the second heat exchanger 8 Respectively. In the bypass path 27b, a second flow rate regulating valve 30 for regulating the flow rate of the thermal oil HO is formed.

On the upstream side of the branch point 28 on the first circulation path 12a is formed a heat oil pump 31 for regulating the flow rate of the thermal oil HO flowing through the thermal oil circulation path 12. The fuel pump (31) is a pump for supplying the fuel oil (HO) to the fuel oil circulation path (12). The flow rate of the hot oil (HO) discharged is controlled by the discharge damper and the inverter by the thermal oil pump (31).

The first flow regulating valve 29, the second flow regulating valve 30, and the hot water pump 31 are controlled by the control device 4.

The flow rate of the thermal oil flow HO flowing through the main flow path 27a downstream of the branch point 28 of the first circulation path 12a is O1 and the flow rate of the thermal flow fluid HO flowing through the bypass flow path 27b is O2 The control device 4 controls the first and second flow rate regulating valves 29 and 30 so that O1: O2 = about 4: 1. That is, the controller 4 controls the flow rate of the fuel oil (HO) flowing through the main path 27a, which is the main flow, to be larger than the flow rate of the fuel oil HO flowing through the bypass path 27b, And controls the second flow regulating valves 29 and 30.

In the third circulation path 12c connecting the first heat exchanger 6 and the power generator main body 11 in the thermal oil circulation path 12, the thermal oil HO flowing through the third circulation path 12c is connected to the third circulation path 12c, And a heating oil temperature measuring device 32 for measuring the temperature of the heating oil. The thermal oil temperature measuring device 32 measures the temperature of the thermal oil HO introduced into the power generator main body 11. [ The temperature of the thermal oil (HO) measured by the thermal oil temperature measuring device (32) is transmitted to the control device (4).

The control device 4 of the present embodiment is configured to control the flow rate of the hot oil HO introduced into the second heat exchanger 8 based on the temperature of the exhaust gas EG measured by the exhaust gas temperature measuring device 18. [ And has a function of adjusting the flow rate.

The control device 4 controls the main path 27a (the branch point 28) of the first circulation path 12a when the temperature of the exhaust gas EG is larger than the set first threshold value (for example, 220 deg. The first and second flow rate regulating valves 29 and 30 are controlled such that the flow rate of the thermal oil HO flowing on the downstream side of the flow rate regulating valve 29 is increased. More specifically, the control device 4 operates the second flow rate adjusting valve 30 so that the flow rate of the thermal oil HO flowing through the bypass path 27b is reduced, The first flow rate adjusting valve 29 is operated so that the flow rate of the thermal oil (HO) increases.

At this time, the flow rate of the thermal oil (HO) in the entire heat transfer circulation path (12) does not change. That is, the flow rate of the thermal oil (HO) supplied to the second heat exchanger (8) can be increased without changing the flow rate of the thermal oil (HO) flowing through the thermal oil circulation path (12). As a result, the heat exchange amount by the second heat exchanger 8 is increased, and the temperature of the exhaust gas (EG) is lowered.

The control device 4 calculates the flow rate of the hot oil HO flowing through the whole of the thermal oil circulation path 12 based on the temperature of the thermal oil HO measured by the thermal oil temperature measuring device 32 As shown in FIG.

The control device 4 controls the flow rate of the hot oil HO flowing through the entire heat transfer path 12 when the temperature of the hot melt oil HO is larger than the set second threshold value (for example, 280 DEG C) The heat pump 31 is controlled so that the amount of heat generated by the heat pump 31 increases.

The flow rate of the hot oil HO in the entire heat transfer path 12 is increased to lower the temperature of the hot oil HO.

Next, the operation of the sludy incineration plant 1 of the present embodiment will be described.

The sludge S is charged into the incinerator 2 and incinerated. The exhaust gas EG (for example, 850 DEG C) generated in association with the incineration is used as a heating source for the thermal oil HO in the first heat exchanger 6. [ The exhaust gas (EG) is used as a heating source for the combustion air (A1) in the air preheater (7).

The temperature of the exhaust gas (EG) having passed through the first heat exchanger (6) and the air preheater (7) is lowered to, for example, 300 deg. That is, the exhaust gas (EG) is quenched from 850 ° C to 300 ° C.

Subsequently, the exhaust gas (EG) is used as a heating source of the heating medium in the second heat exchanger 8. [ The temperature of the exhaust gas (EG) having passed through the second heat exchanger (8) is lowered to 220 ° C. That is, the temperature of the exhaust gas EG is lowered to the heat-resistant temperature of the dust collector 14 by heat exchange in the second heat exchanger 8. The exhaust gas (EG) that has passed through the second heat exchanger (8) is introduced into the dust collector (14).

The exhaust gas (EG) that has passed through the second heat exchanger (8) is introduced into the dust collecting device (14) and subjected to dust collecting treatment.

The exhaust gas EG discharged from the dust collecting device 14 is heat-exchanged with the air A2 supplied by the air supply fan 19 in the air heater 20 of the white smoke prevention device 15, ). The temperature of the air A2 rises to, for example, 150 deg. The mixing air (A3) having passed through the air heater (20) is introduced into the chimney (17) through the mixing air line (21).

The exhaust gas (EG) that has passed through the white smoke prevention device (15) is introduced into the scrubber (16) and becomes harmless. The temperature of the exhaust gas (EG) is reduced to, for example, 40 DEG C in the scrubber (16). The exhaust gas EG that has passed through the scrubber 16 is introduced into the chimney 17 and mixed with the high temperature mixing air A3 introduced through the mixing air line 21. [ Mixing of the exhaust gas (EG) with the mixing air (A3) for preventing white smoke prevents the occurrence of white smoke from the chimney (17).

Next, the operation of the power generation device 3 will be described.

The boiling oil HO circulating through the thermal oil circulation path 12 is heated to 280 DEG C for example by heat exchange with the exhaust gas EG in the second heat exchanger 8 and the first heat exchanger 6 . The heated hot oil (HO) is used to heat the organic working medium (M) in the evaporator (22) of the power generator main body (11). The organic working medium M is vaporized in the evaporator 22 and introduced into the steam turbine 23 to drive the generator 24. [ The steam leaving the steam turbine 23 is cooled and condensed in the condenser 25. The condensed organic working medium (M) is returned to the evaporator (22).

Next, a control method of the sludy incineration plant 1 of the present embodiment will be described. The control method of the sludge incineration plant 1 according to the present embodiment includes a first control method for adjusting the temperature of the exhaust gas EG introduced into the dust collecting apparatus 14, And a second control method of adjusting the temperature of the furnace HO.

The first control method is a control method for controlling the flow rate of the thermal oil (HO) introduced into the second heat exchanger 8 and adjusting the temperature of the exhaust gas (EG) introduced into the dust collector 14.

The first control method includes an exhaust gas temperature determining step P11 for determining whether the temperature of the exhaust gas EG discharged from the second heat exchanger 8 is larger than a first threshold value, A main flow path flow rate increasing step P12 for increasing the flow rate of the heat transfer fluid HO flowing through the main flow path 27a of the first circulation path 12a when the temperature of the exhaust gas EG is greater than the first threshold value, I have.

In the exhaust gas temperature judging step P11, the control device 4 refers to the temperature of the exhaust gas (EG) transmitted from the exhaust gas temperature measuring device 18. The control device 4 determines whether the temperature of the exhaust gas EG is higher than a first threshold value (for example, 220 占 폚). When the temperature of the exhaust gas (EG) is 220 DEG C or less, the control device (4) does not change the opening degree of the valves (29, 30).

When the temperature of the exhaust gas EG is higher than 220 DEG C, the control device 4 executes the main-shaft flow rate increasing process P12. In the main flow path flow increasing process P12, the control device 4 adjusts the opening degree of the valves 29, 30 to increase the flow rate of the thermal oil flow HO flowing through the main flow path 27a. As a result, the amount of heat exchange between the exhaust gas (EG) and the thermal oil (HO) increases and the temperature of the exhaust gas (EG) decreases.

On the other hand, when the temperature of the exhaust gas EG is low, the control device 4 adjusts the opening degree of the first and second flow rate regulating valves 29 and 30, ) May be performed.

The second control method is a control method of controlling the flow rate of the thermal oil HO flowing through the thermal oil circulation path 12 and adjusting the flow rate of the thermal oil HO introduced into the power generator main body 11. [

The second control method includes a fever-oil temperature determining step P21 for determining whether or not the temperature of the boil-off oil HO discharged from the first heat exchanger 6 is larger than the second threshold value, And a flow rate increasing step P22 for increasing the flow rate of the thermal oil (HO) flowing through the entire thermal oil circulation path (12) when the flow rate is larger than the second threshold value.

In the thermal oil temperature determination process P21, the control device 4 refers to the temperature of the thermal oil (HO) transmitted from the thermal oil temperature measurement device 32. [ The control device 4 determines whether the temperature of the thermal oil HO is greater than a second threshold value (e.g., 280 DEG C). When the temperature of the thermal oil (HO) is 280 DEG C or lower, the controller (4) does not change the discharge flow rate of the thermal oil pump (31).

When the temperature of the heating oil HO discharged from the first heat exchanger 6 is higher than 280 DEG C, the control device 4 executes the heating oil flow rate increasing step P22. In the thermal oil flow rate increasing process P22, the control device 4 adjusts the discharge flow rate of the thermal oil pump 31 to increase the flow rate of the thermal oil HO flowing through the thermal oil circulation path 12. As a result, the temperature of the thermal oil HO introduced into the power generator main body 11 is lowered.

On the other hand, when the temperature of the thermal oil HO is low, the control device 4 may control the discharge flow rate of the thermal oil pump 31 to decrease the flow rate of the thermal oil HO.

According to the above embodiment, the temperature of the exhaust gas (EG) introduced into the dust collecting apparatus 14 is reduced by using the second heat exchanger 8, for example, by using the exhaust gas cooling tower, It is possible to make more effective use of heat as compared with the reduction.

The flow rate of the thermal oil (HO) introduced into the second heat exchanger 8 is adjusted based on the temperature of the exhaust gas (EG) measured by the exhaust gas temperature measuring device 18, The temperature of the dust collecting device 14 can be set to a temperature corresponding to the heat resistant temperature of the dust collecting device 14.

The temperature of the exhaust gas EG flowing into the dust collector 14 is adjusted by the flow rate of the thermal oil HO introduced into the second heat exchanger 8 disposed on the upstream side of the dust collector 14 , The temperature of the exhaust gas (EG) can be adjusted more quickly.

It is also possible to adjust the temperature of the hot oil HO by adjusting the flow rate of the hot oil HO supplied to the power generator main body 11 based on the temperature of the hot oil HO exchanged in the first heat exchanger 6 It is possible to adjust the temperature of the generator 3 to a suitable temperature. It is also possible to cope with the temperature rise of the exhaust gas (EG) when the temperature (heat amount) of the exhaust gas (EG) discharged from the incinerator (2) greatly increases. Further, it is possible to cope with the temperature decrease of the exhaust gas when the temperature (heat amount) of the exhaust gas discharged from the incinerator is greatly reduced.

In addition, since the white smoke prevention device 15 that heats the outside air by the exhaust gas EG passed through the dust collector 14 and supplies it to the chimney 17 is provided, for example, the second heat exchanger 8, Heat is recovered from the exhaust gas (EG) at a low temperature, as compared with the case where the whitener prevention device is provided on the upstream side. Therefore, the heat recovery rate of the entire system can be improved.

When the white smoke prevention device 15 is made of the low-temperature corrosion-resistant type, even when the white smoke prevention device 15 recovers, for example, the heat of the exhaust gas (EG) ) Minutes or chlorine (Cl) can be prevented at low temperatures.

Further, by using the thermal oil (HO) as the heat medium to be used for the heat recovery from the exhaust gas (EG) caused by the waste heat, simplification and miniaturization of equipment and devices can be achieved have.

In addition, by employing the binary cogeneration system as the power generation device 3, it is possible to efficiently generate power even when the scale of the plant is small (for example, the sludge throughput of 100 t / day).

Although the embodiments of the present invention have been described in detail above, various modifications can be made within the scope not deviating from the technical idea of the present invention.

For example, if the smoke discharged from the chimney 17 may be white smoke, the white smoke prevention device 15 may be omitted.

The control device 4 may execute the first control method and the second control method at the same time. By simultaneously controlling the exhaust gas temperature and the heat temperature, the responsiveness of each other can be increased by the synergetic effect, and consequently, the converged speed can be increased.

1: Sludge incineration plant (waste heat power generation system)
2: Incinerator
3: Generator
4: Control device
5: Exhaust gas line
6: first heat exchanger
7: Air preheater
8: Second heat exchanger
9: Exhaust gas treatment device
11: Power generator main body
12: Fruit circulation path
12a: first circulation path
12b: second circulation path
12c: third circulation path
13: Combustion air line
14: Dust collector
15: White smoke preventer
16: Scrubber
17: chimney
18: Exhaust gas temperature measuring device
19: Air supply fan
20: air heater
21: Mixing air line
22: Evaporator
23: Steam turbine
24: generator
25: Condenser
27a: The main road
27b: Bypass path
28: Junction point
29: First flow regulating valve
30: second flow regulating valve
31: Fruit pump
32: Fruit oil temperature measuring device
A1: Combustion air
A2: air
EG: Exhaust gas
HO: fruit oil
M: organic working medium
S: Souni

Claims (7)

The incinerator,
An exhaust gas line through which the exhaust gas discharged from the incinerator flows,
A power generation device that generates power using heat energy as a heat source,
A first heat exchanger for exchanging heat between the exhaust gas and the fuel oil supplied to the power generation device,
An air preheater formed in parallel with the first heat exchanger in the exhaust gas line for exchanging heat between the exhaust gas and air supplied to the incinerator,
A dust collector for removing solid components from the exhaust gas heat-exchanged in the first heat exchanger and the air preheater,
A second heat exchanger formed on an upstream side of the dust collecting device in the exhaust gas line and performing heat exchange between the exhaust gas heat-exchanged in the first heat exchanger and the air preheater and the heat transfer fluid supplied to the first heat exchanger A waste heat power generation system. The method according to claim 1,
And a control device for adjusting a flow rate of the heat of the heat-exchanged heat in the second heat exchanger based on the temperature of the exhaust gas discharged from the second heat exchanger. 3. The method of claim 2,
A heat oil circulation path through which the fruit oil circulates,
And a bypass path bypassing the upstream side of the second heat exchanger and the downstream side of the second heat exchanger by bypassing the second heat exchanger in the heat transfer oil circulation path,
Wherein the control device adjusts the flow rate of the oil flowing through the bypass path. The method according to claim 1,
And adjusts the flow rate of the heat of the oil supplied to the power generation device based on the temperature of the heat of the heat-exchanged heat in the first heat exchanger. 3. The method of claim 2,
And adjusts the flow rate of the heat of the oil supplied to the power generation device based on the temperature of the heat of the heat-exchanged heat in the first heat exchanger. The method of claim 3,
And adjusts the flow rate of the heat of the oil supplied to the power generation device based on the temperature of the heat of the heat-exchanged heat in the first heat exchanger. 7. The method according to any one of claims 1 to 6,
And a white smoke prevention device for heating the outside air by the exhaust gas discharged from the second heat exchanger and passed through the dust collecting device to supply the outside air to the chimney.

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