JP2002256884A - Power system for thermal decomposition and gasification of sewage sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently decompose and gasify a sewage sludge A by a simply constructed device and facility to recover the holding energy of the sewage sludge A as a power in high efficiency. SOLUTION: The power system for thermal decomposition and gasification of the sewage sludge A is provided with a dryer 1 for heating the sludge A to dry, a fluidized bed type thermal decomposition furnace 2 for thermally decomposing the sewage sludge B dried by the dryer 1 on the fluidized bed D to generate a thermal decomposition gas E, and a gas turbine generator 7 for generating power by the cleaned thermal decomposition gas E.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage sludge pyrolysis gasification power generation system that generates power using pyrolysis gas generated by pyrolyzing sewage sludge.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open Nos. 11-197698 and 11-200882 disclose power generation using gas generated by decomposing sewage sludge.
In the publication, sewage sludge is converted into a slurry by hydrothermal decomposition to reduce the molecular weight, and this is partially oxidized in a gasification furnace to produce a crude gas such as carbon monoxide and hydrogen, and the crude gas thus produced is purified. After that, power generation is performed in a gas turbine generator, and power generation is also performed in a steam turbine generator using steam generated by the exhaust gas.

[0003]

However, in such a conventional power generation system, the sewage sludge is first decomposed by hydrothermal decomposition, that is, the sewage sludge is heated by the first heat exchanger, and then the sewage sludge is heated. It is further heated to a high temperature in the second heat exchanger, and then is subjected to hydrothermal decomposition in a reaction evaporator to reduce the molecular weight. The equipment and facilities required for this hydrothermal decomposition are large-scale and complicated. It is inevitable to become. In addition, the slurry obtained by hydrothermal decomposition is a slurry having a solid content of about 55%, which is only partially oxidized by oxygen or air in a gasification furnace, so that the gasification efficiency is poor and Since the temperature of the generated crude gas is also low, the gas temperature is reduced to about 500 ° C. only by purifying the crude gas, and the energy retained in the sewage sludge cannot be used effectively.

The present invention has been made in view of such a background, and aims to efficiently decompose and gasify sewage sludge by using relatively simple devices and equipment to reduce the energy held by sewage sludge. It is an object of the present invention to provide a sewage sludge pyrolysis gasification power generation system that can be recovered as electric power with high efficiency.

[0005]

In order to solve the above-mentioned problems and to achieve the above object, the present invention provides a dryer for heating and drying sewage sludge, and a sewage dried by the dryer. It is characterized by comprising a fluidized bed type pyrolysis furnace that generates pyrolysis gas by pyrolyzing sludge in a fluidized bed, and a gas turbine generator that generates power using the purified pyrolysis gas. . That is, in the present invention, a fluidized bed pyrolysis furnace for thermally decomposing sewage sludge is a method in which a treatment product supplied into the furnace is caused to flow by a flowing gas together with a high-temperature flowing medium in a fluidized bed. The sewage sludge is dispersed in the fluidized bed by the vigorous flow of the fluidizing medium, and the surface is constantly scraped off by the fluidizing medium. Gas is generated. Therefore, in the pre-process of gasifying sewage sludge, it is sufficient to provide only a dryer for drying the sewage sludge,
No large-scale and complicated equipment and facilities such as the first and second heat exchangers and reaction evaporators in the conventional hydrothermal cracking are required, and the sewage sludge flows by drying in this way. It can be efficiently pyrolyzed and gasified by a stratified pyrolysis furnace, and by using such pyrolysis gas in a gas turbine generator, it is possible to generate electricity with high combustion calories and high efficiency Becomes

In addition, since the pyrolysis gas generated in the fluidized bed pyrolysis furnace itself has a high temperature as described above, heat exchange is performed by the pyrolysis gas in the pyrolysis gasification power generation apparatus. A heat exchanger for performing the thermal decomposition of the dried sewage sludge in the fluidized bed of the fluidized bed pyrolysis furnace by the fluidizing gas preheated in the heat exchanger. It is possible to more effectively use the energy of the pyrolysis gas. It is desirable that the temperature of the pyrolysis gas generated in the fluidized bed pyrolysis furnace be in the range of 500 to 800 ° C. If it is lower than this, the amount of generated gas is small and supplied to the gas turbine. While the calorific value may decrease, effective energy utilization of the sewage sludge may not be sufficiently achieved.On the other hand, if the calorific value is higher than this, the calorific value of generated gas decreases and the combustible gas recovered Since the total amount of heat generated by the gas turbine decreases (the sensible heat increases), the efficiency of the gas turbine may decrease.

[0007] Further, a waste heat boiler for recovering waste heat of exhaust gas discharged from the gas turbine generator is provided, and the sewage sludge is heated in the dryer by the waste heat recovered in the waste heat boiler. In addition, the sewage sludge can be effectively used for its energy. Further, based on the amount of power generated by the gas turbine generator,
If the amount of water of the sewage sludge dried by the dryer and the pyrolysis temperature in the fluidized bed pyrolysis furnace can be controlled, such as the composition and water content of the sewage sludge supplied to the dryer It is possible to set so that the maximum power generation amount can be obtained according to the fluctuation of the conditions and the like. In order to reduce the molecular weight of the pyrolysis gas, it is desirable that a catalytic substance such as CaO can be added to the fluidized bed in the fluidized-bed pyrolysis furnace.

[0008]

FIG. 1 shows an embodiment of the present invention. Hereinafter, a case where power is generated by using sewage sludge A by supplying to a pyrolysis gasification power generation system of this embodiment will be described. . In FIG. 1, reference numeral 1 denotes a dryer, and in the following order, reference numeral 2 denotes a fluidized bed pyrolysis furnace,
Reference numeral 3 denotes an ash separation device, reference numeral 4 denotes a heat exchanger, reference numeral 5 denotes a gas cleaning device, reference numeral 6 denotes a gas holder, reference numeral 7 denotes a gas turbine generator, and reference numeral 8 denotes a waste heat boiler.

The dryer 1 heats the sewage sludge A supplied to the power generation system, for example, having a water content of about 75% by weight, an organic content in the solid content of about 80% by weight, and the remaining about 20% by weight of ash. The dryer 1 is an indirect heating dryer such as a stirring rotary type or a steam heating multi-tube rotary type (for example, a cylindrical stirring dryer, a steam heating tube type rotary dryer, a drum dryer). Dryers), and direct heating dryers such as fluidized bed type, multi-stage disk type, vibrating box type, etc. (eg, flash dryer, rotary dryer, through-air dryer, band dryer, etc.)
However, in this embodiment, a steam tube type indirect heating dryer is used. In the dryer 1, the sewage sludge A has a water content of 10 to 30.
The dried sludge B is dried to about wt% to be supplied to the next fluidized bed pyrolysis furnace 2.

The fluidized bed pyrolysis furnace 2 has a dispersing plate 2a disposed in the lower part of the furnace and a pressurizing chamber 2b defined below the dispersing plate 2a. When the fluidizing gas (air) C adjusted to a high temperature is supplied and ejected from the dispersion plate 2a, the fluidizing medium (sand) held on the dispersion plate 2a is caused to flow and the fluidized bed D Is formed. The dried sludge B dried by the dryer 1 is introduced into the fluidized bed D of the fluidized bed pyrolysis furnace 2 and flows with the fluidizing medium while being vibrated. It is dispersed in the layer D and the surface is constantly scraped off by a fluidizing medium to be refined, thereby being thermally decomposed in a short period of time. E is generated. The fluidized bed pyrolysis furnace 2 can be added with a catalytic substance F such as CaO in the fluidized bed D. The ash that is not thermally decomposed in the dried sludge B is appropriately extracted from the fluidized bed D, separated from the fluidizing medium, and then treated by melting or the like.

Further, the pyrolysis gas E generated in the fluidized bed pyrolysis furnace 2 is supplied to an ash separation device 3 and the ash content discharged from the fluidized bed pyrolysis furnace 2 together with the pyrolysis gas E is obtained. After G is separated and removed, heat exchanger 4
Supplied to In addition, as the ash separation device 3, for example, a cyclone or a high temperature bag filter can be used.
The separated ash G is processed together with the ash extracted from the fluidized bed pyrolysis furnace 3 by melting or the like. Also,
In this embodiment, the pyrolysis temperature of the pyrolysis gas E generated in the fluidized bed pyrolysis furnace 2 and supplied to the ash separation device 3 is controlled in the fluidized bed pyrolysis furnace 2 as described later. Thereby, it can be adjusted within the range of 500 to 800 ° C.

The heat exchanger 4 can be supplied with air (outside air) H as a heat exchange medium with respect to the pyrolysis gas E as a heat exchange medium. By performing heat exchange between the decomposition gas E and the air H, the high-temperature decomposition gas E as described above is reduced to 30%.
The temperature of the air H is raised to about 300 to 500 ° C. while the temperature is reduced to about 0 to 500 ° C. In the present embodiment, the air H preheated by heat exchange in the heat exchanger 4 is supplied under pressure to the pressurizing chamber 2b of the fluidized bed pyrolysis furnace 2 after the oxygen concentration is adjusted,
The fluidized gas C is used for thermally decomposing the dried sludge B in the fluidized bed D.

On the other hand, the pyrolysis gas E which has exchanged heat with the air H in the heat exchanger 4 is then subjected to a purifying treatment by removing components such as tar, dust, hydrogen sulfide and the like in a gas purifying apparatus 5 to remove hydrogen, The purified gas I is mainly composed of a low-molecular combustible gas such as methane, ethane, and ethylene, and is stored in a gas holder 6 before being supplied to a gas turbine generator 7. Here, the gas cleaning device 5
In the above, for example, a combination of a gas cleaning device and a wet electric dust collector can be used. And
In the gas turbine generator 7, the purified gas I thus purified is burned by the air (outside air) J in the combustor 7a to rotate the gas turbine 7b, and power is generated by the generator 7c using the rotational energy. Thus, electric power K is generated.

Further, the high-temperature flue gas L of about 770 ° C. after burning the purified gas I discharged from the gas turbine generator 7 has its waste heat recovered by the waste heat boiler 8 to about 250 ° C. And exhausted to the atmosphere as exhaust M. Further, the high-temperature steam N generated by the waste heat of the combustion exhaust gas L collected in the waste heat boiler 8 can be supplied to the dryer 1 of the steam pipe type indirect heating type in the present embodiment, and the sewage is discharged. The sludge A is subjected to heating and drying, and the steam N or the condensate O whose temperature has been reduced by this is again supplied to the waste heat boiler 8 where it is heated and circulated as high-temperature steam N.

Further, in the present embodiment, the amount of electric power generated by the gas turbine generator 7;
That is, the amount of power generation can be measured by the power generation amount measuring means 11 and the purified gas is placed between the combustor 7a of the gas turbine generator 7 and the gas holder 6 so that the set power generation amount is secured. Gas amount adjusting means 12 for supplying I to the combustor 6a is provided. On the other hand, the dryer 1
, The dried sludge B dried in the dryer 1
Moisture measuring means 13 for measuring the moisture content of the
And a water content control means 14 for controlling the water content of the dried sludge B by adjusting the heating temperature of the sewage sludge A supplied to the sewage sludge and the residence time in the dryer 1. The pyrolysis furnace 2 has a pyrolysis temperature measuring means 1 for measuring the pyrolysis temperature in the fluidized bed D.
5, and by controlling the temperature and oxygen concentration of the fluidizing gas C supplied to the pressurized chamber 2b of the fluidized bed pyrolysis furnace 2, the pyrolysis temperature in the fluidized bed pyrolysis furnace 2 is controlled. A pyrolysis temperature control means 16 is provided. The water content control means 14 and the pyrolysis temperature control means 1
6 means the measurement result by the moisture content measuring means 13 and the measurement result by the pyrolysis temperature measuring means 15 based on the gas holder level measured by the level detecting means 17 such as a level meter provided in the gas holder 6. In view of the above, it is possible to control each of them, and by increasing or decreasing the level of the purified gas I in the gas holder 6, the sludge moisture and the thermal decomposition temperature can be adjusted.

Specifically, for example, when the level of the purified gas I stored in the gas holder 6 tends to decrease, the moisture amount of the dried sludge B is reduced by the moisture amount control means 14. When the fluidized bed pyrolysis furnace 2 is operated by the pyrolysis temperature control means 16 so as to keep the pyrolysis temperature constant, the gas generated by the gas turbine generator The amount of purified gas I to be supplied to 7 is small, and the level of gas holder 6 is therefore raised. Alternatively, even if the operating temperature of the fluidized bed pyrolysis furnace 2 is lowered by the pyrolysis temperature control means 16, the calorific value of the pyrolysis gas E increases, so that the purified gas I to be supplied to the gas turbine generator 7 is also increased. The amount of gas needs to be small, so that the level of the gas holder 6 rises. Further, when the level of the gas holder 6 is remarkably lowered so as to deviate from any of these control ranges, the supply amount of the sewage sludge A supplied to the dryer 1 is increased, or the setting of the power generation amount itself is reduced. In addition, when the level of the gas holder 6 is increasing, the operation is reverse to that when the level is decreasing. These operations are set by a computer program so that the optimal operation is selected according to the driving situation at that time.

In the thermal decomposition gasification power generation apparatus for sewage sludge A thus constructed, the dried sludge B obtained by drying the sewage sludge A by the dryer 1 is thermally decomposed by the fluidized bed pyrolysis furnace 2. Therefore, first, in the pre-process of gasifying the sewage sludge A, the first and second heat exchangers and the reaction evaporator as in the conventional hydrothermal decomposition are used. It is only necessary to dry the sewage sludge A by the dryer 1 without requiring a large-scale and complicated apparatus and equipment, and the apparatus and equipment structure can be made compact and simple. Also, when the thus treated sewage sludge A is decomposed and gasified, a slurry having a solid content of about 55% obtained by hydrothermal decomposition is conventionally partially oxidized with oxygen or air in a gasification furnace. Instead, the dried sludge B having the water content reduced to about 5 wt% is supplied to the fluidized bed D by the fluidizing medium and the fluidizing gas C.
The gas is dispersed and refined while being fluidized by the heat treatment, and is pyrolyzed into a gas in a short time, thereby generating a high-calorie pyrolyzed gas E at a high temperature.
By using this, it is possible to perform efficient power generation in the gas turbine generator 7 by the high combustion calories of the pyrolysis gas E. That is, according to the pyrolysis gasification power generation device having the above-described configuration, it is possible to efficiently decompose and gasify the sewage sludge A even with a device and equipment having a relatively simple configuration. Can be recovered as electric power with high efficiency.

Further, in the pyrolysis gasification power generation apparatus of the present embodiment, the high temperature generated in the fluidized bed pyrolysis furnace 2 is interposed between the fluidized bed pyrolysis furnace 2 and the gas turbine generator 7. A heat exchanger 4 for performing heat exchange using the pyrolysis gas E as a heat exchange medium is provided. The heat exchanger 4 flows into the fluidized bed D of the fluidized bed type pyrolysis furnace 2 as a heat exchange medium. Air H, which is supplied as a service gas C, is supplied and can be preheated by heat exchange. Therefore, according to the present embodiment, the thermal energy of the high-temperature pyrolysis gas E, that is, the energy of the sewage sludge A is also used when generating the high-temperature flowing gas C required for the thermal decomposition of the dry sludge B. Therefore, it is possible to achieve more efficient gas turbine power generation using sewage sludge A.

In particular, when the heat exchange is performed between the pyrolysis gas E and the air H as the fluidizing gas C by the heat exchanger 4 as described above, the fluidized bed pyrolysis furnace 2 is used. Is preferably in the range of 500 to 800 ° C. as in the present embodiment. This is because if the temperature of the pyrolysis gas E is lower than this, the calories of the pyrolysis gas E will increase, but the amount of tar will also increase and the decomposition of combustibles will not be performed. This is because the amount of heat supplied to the gas turbine generator 7 is rather reduced. On the other hand, if the temperature of the pyrolysis gas E is higher than the above range, the calorie of the pyrolysis gas E decreases and the total amount of heat generated by the purified gas I decreases. , More purified gas I must be combusted in the combustor 7a by a large amount of air J, and the sensible heat is increased by the large amount of nitrogen in the air J, and the power generation efficiency in the gas turbine generator 7 is also increased. It may decrease.

On the other hand, in the present embodiment, the pyrolysis gas E that has been subjected to heat exchange by the heat exchanger 4 is subjected to a purifying treatment by removing tar, dust, hydrogen sulfide and the like in the gas purifying device 5. , Hydrogen, methane, ethane,
And a low molecular flammable gas such as ethylene is stored as a purified gas I as a main component in the gas holder 6. The purified gas I is supplied to the gas turbine generator 7 so as to generate a set amount of power by the gas amount adjusting means 12, and is burned by the air J in the combustor 7a to be used for rotation of the gas turbine 7b. Is done. Therefore, the above-described components such as tar and dust adhere to the gas turbine 7b and hinder the rotation thereof, or prevent the harmful components such as SOx in the flue gas L from increasing due to hydrogen sulfide or the like. It is possible to promote more reliable high-efficiency power generation and to suppress the occurrence of corrosion in the waste heat boiler 8.

In the present embodiment, a catalytic substance such as CaO can be added to the fluidized bed D also in the fluidized bed pyrolysis furnace 2. When the organic component in B is thermally decomposed, the decomposition of the pyrolysis gas E is reduced by such a catalytic substance, so that the purified gas I supplied to the gas turbine generator 7 can be more reliably obtained. It is possible to promote low molecular weight. In addition, in addition to the above-mentioned CaO, for example, Al ₂ O. O ₃ and Fe ₂ O ₃ are exemplified.

Further, in the present embodiment, the high-temperature combustion exhaust gas L after burning the purified gas I thus supplied to the gas turbine generator 7 is supplied to the waste heat boiler 8 to recover the waste heat. Generates high-temperature steam N, and the steam N can be supplied to the dryer 1, so that the sewage sludge A is dried to be dried sludge B. Therefore, according to the present embodiment, the energy of the combustion exhaust gas L, which is the hottest gas in the pyrolysis gasification power generation system, can also be effectively used, that is, the efficiency of the energy held by the sewage sludge A can be further improved. On the other hand, the flue gas L from which waste heat is recovered has a temperature of 25% as described above.
Since the purified gas I which has been reduced to about 0 ° C. and which has been purified by the gas purifying apparatus 5 and which has been purified is burned, it is clean and can be directly discharged to the atmosphere as the exhaust M.

Further, in the present embodiment, the gas turbine generator 7 is provided with a power generation amount measuring means 11 for measuring the power generation amount, and the dryer 1 is provided with a dry sludge B
The moisture content measuring means 13 for measuring the moisture content of the dried sludge B and the moisture content controlling means 14 for controlling the moisture content of the dried sludge B, and the fluidized bed pyrolysis furnace 2 measures the thermal decomposition temperature in the fluidized bed D. A pyrolysis temperature measuring means 15 and a pyrolysis temperature control means 16 for controlling the pyrolysis temperature are provided, and a level detecting means 17 is provided for the gas holder 6 for storing the purified gas I. Based on the amount of power generation measured by the means 11, the water content control means 13 and the pyrolysis temperature control means 15 are respectively controlled based on the measurement result by the water content measurement means 13 and the measurement result by the pyrolysis temperature measurement means 15. It is possible. Therefore, for example, the amount of water in the supplied sewage sludge A increases and the amount of water in the dry sludge B also increases, and accordingly, the thermal decomposition temperature in the fluidized bed D also decreases, thereby suppressing pyrolysis gasification. If the amount of power generated by the gas turbine generator 7 decreases and a large amount of purified gas I is supplied to the gas turbine generator 7 in an attempt to keep the power constant, the level of the gas holder 6 decreases. The detection unit 17 detects and controls at least one of the water content control unit 14 and the thermal decomposition temperature control unit 16 so that the moisture content measurement unit 13 and the thermal decomposition temperature measurement unit 15 can measure the dry sludge B. By reducing the amount of water in the gas holder or raising the thermal decomposition temperature, the level of the lowered gas holder 6 can be increased again. For this reason, according to the present embodiment, by performing such control continuously and automatically by a computer or the like, regardless of fluctuations in the power generation conditions such as the composition of the supplied sewage sludge A and the water content, etc. Accordingly, the amount of power generated by the gas turbine generator 7 can be constantly maintained at the maximum, and more efficient use of the energy held by the sewage sludge A can be promoted to promote more efficient power generation.

[0024]

As described above, according to the present invention,
The sewage sludge is dried by heating in a drier, and the dried sewage sludge is supplied to a fluidized bed type pyrolysis furnace and pyrolyzed while flowing in the fluidized bed to generate a pyrolysis gas. Can be supplied to a gas turbine generator after purification treatment to generate electricity, so efficient power generation can be achieved with a compact and simple device and equipment structure, and the energy of sewage sludge can be effectively used It is possible to do. Further, heat exchange is performed between the pyrolysis gas and the fluidizing gas supplied to the fluidized bed of the fluidized bed type pyrolysis furnace by a heat exchanger, and the fluidizing gas preheated by the heat exchanger is transferred to the fluidized bed. By supplying, the energy of the high-temperature pyrolysis gas can be effectively used. In particular, at this time, by controlling the temperature of the pyrolysis gas generated in the fluidized bed pyrolysis furnace in the range of 500 to 800 ° C., the effective use of the energy of such a high-temperature pyrolysis gas is further ensured. However, it is possible to prevent troubles such as the adhesion of fly ash in the heat exchanger.

Further, the waste gas discharged from the gas turbine generator is supplied to a waste heat boiler, and the waste heat recovered in the waste heat boiler is used to heat the sewage sludge in the dryer. Further effective use of energy can be achieved. Further, based on the amount of power generated by the gas turbine generator, the sewage supplied by controlling the water content of the sewage sludge dried by the dryer and the pyrolysis temperature in the fluidized bed pyrolysis furnace. Regardless of fluctuations in conditions such as the composition of sludge and water content, it is possible to always obtain the maximum power generation in response to this. Furthermore, if a catalytic substance is added to the fluidized bed in the fluidized bed type pyrolysis furnace, the decomposition gas of the pyrolysis gas can be reduced more reliably.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 dryer 2 fluidized bed pyrolysis furnace 3 ash separator 4 heat exchanger 5 gas purifier 6 gas holder 7 gas turbine generator 8 waste heat boiler 11 power generation amount measuring means 12 gas amount adjusting means 14 water amount controlling means 16 Pyrolysis temperature control means A Sewage sludge B Dry sludge C Fluidizing gas D Fluidized bed E Pyrolysis gas F Catalytic substance H, J Air I Purified gas K Electric power L Combustion exhaust gas N Steam

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F23G 5/04 ZAB F23G 5/04 ZABA 5/16 ZAB 5/16 ZABE 5/46 ZAB 5/46 ZABA 7/00 ZAB 7/00 ZAB 104 104A (72) Inventor Kenji Suzuki 2-17-15 Tsukuda, Chuo-ku, Tokyo Tsukishima Kikai Co., Ltd. F-term (reference) 3K061 AA11 AB02 AC02 BA10 DA05 DA19 DB17 EA01 EB15 EB18 3K065 AA11 AA24 AB02 AC02 BA10 CA13 JA05 JA15 JA18 3K078 AA10 BA08 CA02 CA11 CA21 4D059 AA03 BB03 BB13 BD11 BF15 CA01 CA10 CA12 DA04 EA01 EA10 EB01 EB10 EB16

Claims (6)

[Claims] 1. A dryer for heating and drying sewage sludge,
A fluidized bed pyrolysis furnace that pyrolyzes sewage sludge dried by the dryer in a fluidized bed to generate a pyrolysis gas,
A sewage sludge pyrolysis gasification power generation system, comprising: a gas turbine generator configured to generate power using the purified pyrolysis gas. 2. A heat exchanger for exchanging heat with the pyrolysis gas generated in the fluidized bed pyrolysis furnace,
The heat of sewage sludge according to claim 1, wherein the dried sewage sludge is pyrolyzed in the fluidized bed of the fluidized bed pyrolysis furnace by the fluidizing gas preheated in the heat exchanger. Cracking gasification power generation system. 3. The sewage sludge according to claim 1, wherein the temperature of the pyrolysis gas generated in the fluidized bed pyrolysis furnace is in the range of 500 to 800 ° C. Pyrolysis gasification power generation system. 4. A waste heat boiler for recovering waste heat of exhaust gas discharged from the gas turbine generator, wherein the waste heat recovered in the waste heat boiler heats the sewage sludge in the dryer. The sewage sludge pyrolysis gasification power generation system according to any one of claims 1 to 3. 5. The amount of water in the sewage sludge dried by the dryer and the pyrolysis temperature in the fluidized bed pyrolysis furnace can be controlled based on the amount of power generated by the gas turbine generator. 2. The method according to claim 1, wherein
The sewage sludge pyrolysis gasification power generation system according to any one of claims 1 to 4. 6. The sewage sludge according to claim 1, wherein a catalytic substance can be added to the fluidized bed in the fluidized bed pyrolysis furnace. Pyrolysis gasification power generation system.