JPH0629573B2 - Power generation system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a power generation system that organically combines sewage treatment and power generation and effectively uses thermal energy generated during power generation.

<Conventional technology and its problems> Septic odor from human waste and domestic wastewater led to the sewage treatment tank,
A large number of malodorous gases that cause an ammonia odor and the like are generated and released into the atmosphere. For this reason, sewage treatment facilities are generally constructed in the suburbs away from residential areas and downtown areas in consideration of residents' feelings. However, in this case, the sewer pipe for guiding human waste and domestic wastewater from the residential area to the sewage treatment facility becomes long and has a large diameter, and a great deal of labor is required for its construction work.

On the other hand, the recent development of sewage treatment technology has made it possible to make sewage meet environmental standards in sewage treatment facilities. Therefore, if the odorous gas that causes a bad smell can be deodorized, not only will the public sentiment be aggravated even if a sewage treatment facility is constructed in a residential area, but the sewer pipe will be shortened and the construction work will be It will be easy.

The present invention has been made in consideration of the above circumstances, and uses a power generator to deodorize malodorous gas generated from a wastewater treatment facility, and a power generation system that effectively uses thermal energy generated during power generation. It is intended to be provided.

<Means for Solving Problems> In order to achieve the above object, the present invention separates a sewage treatment tank into an underground portion of a building, and a odorous gas from the sewage treatment tank is driven at high temperature by a gas turbine generator. It is intended to be supplied to. That is, the power generation system according to the present invention is provided with a processing chamber which is provided in the underground part of the building so as to isolate the sewage treatment tank, and the inside of which is adjusted to a negative pressure, and the air in the processing chamber is supplied as air for fuel combustion. Gas turbine generator, wiring for supplying electric power from the gas turbine generator to electric appliances arranged in a building, and heat exchanger for exchanging latent heat of exhaust gas from the gas turbine generator with latent heat of hot water. It is characterized by having and.

<Example> Hereinafter, the present invention will be described more specifically with reference to the drawings.

FIG. 1 is a schematic sectional view of an embodiment of the present invention, FIG. 2 is a plan view of an underground portion thereof, and FIG. 3 is a block diagram of a power generation system. The building 1 is built in a residential area or a downtown area and constitutes various facilities such as a gymnasium, a movie theater, and a theater. The building 1 is composed of an above-ground portion and an underground portion, the above-mentioned various facilities are provided above the ground portion, and a treatment room 2 for treating wastewater and a power generation room 3 for generating electricity are provided in the underground portion. The treatment room 2 treats human waste, domestic wastewater, etc. discharged from the surrounding residential areas and downtown areas so as to meet environmental standards, and is provided with various sewage treatment tanks. This sewage treatment tank is
Sand settling tank 4, aeration tank 5, settling tank 6, nitrification tank 7, denitrification tank 8,
It is composed of a coagulating sedimentation tank 9, and a flow rate adjusting tank, a deaeration tank, and a disinfection tank (none of which are shown) are appropriately connected in the middle. The sand settling tank 4 is the soil in the wastewater flowing from the introduction pipe 10,
Foreign substances such as sand and paper are removed, and the aeration tank 5 performs aeration to settle sludge in a settling tank 6 following the aeration tank 5.
The nitrification tank 7 mainly oxidizes and decomposes ammonia, and the denitrification tank 8 reduces and removes nitric oxide.
D, COD, SS are reduced and phosphorus compounds and nitrogen compounds are decomposed, and sewage that conforms to the environmental standard value is discharged from the discharge pipe 11 to a river or the like through the coagulating sedimentation tank 9. In addition,
Such a series of sewage treatment tanks are arranged in a plurality of rows in the treatment chamber 2 so that even a large amount of sewage can be accommodated. The processing chamber 2 is separated from the above-ground portion, the power generation chamber, and other rooms by a concrete wall and a door, and the inside is maintained at a negative pressure. This negative pressure condition is maintained by the fan 12 in this embodiment.
That is, the air supply duct 13 and the intake duct 1 are provided in the processing chamber 2.
4 are opposed to each other above the sewage treatment tank, and the fan 12 is attached to the intake duct 14. Therefore, when the fan 12 is driven, the inside of the processing chamber 2 is depressurized by the intake duct 14, and the outside air flows in from the air supply duct 13, but the discharge amount and the inflow amount are determined by the valves 15 and 1.
A negative pressure state is obtained by adjusting with 6. By isolating the processing chamber 2 from the other rooms of the building 1 and maintaining the negative pressure in the processing chamber 2 in this way, the air in the processing chamber 2 leaks from the other parts except the intake duct 4. In addition, since the outside air flows in only one way even if the door of the treatment room 2 is opened, the offensive odor generated from the sewage treatment tank does not leak to the outside, especially various facilities on the ground, and gives an unpleasant feeling. Disappears.

Like the processing chamber 2, the power generation chamber 3 is separated by a concrete wall, and a generator 17 is provided inside the power generation chamber 3 to supply electricity to various equipment such as lighting fixtures and air conditioners of various facilities provided on the ground. It is supposed to be supplied. In the present invention, the generator 17 is a gas turbine generator. The gas turbine generator 17 has a power generator built into a jet engine that serves as a driving force for an aircraft, a ship, etc., and a conventionally known one can be used. Therefore, details thereof will be omitted. 80
Combustion is performed at a high temperature of 0 ° C. or higher, and the high temperature is used to eliminate the malodorous odor and to effectively utilize the heat energy, and the electric power of the gas turbine generator 17 is supplied to the building 1. First, the malodorous odor is converted by introducing the air in the processing chamber 2 from the intake duct 14 to the gas turbine generator 17 and supplying the air as fuel combustion air. or,
The effective use of thermal energy is performed by guiding the exhaust gas from the gas turbine generator 17 to the heat exchanger 18.
Here, the gas turbine generator 17 generates noise when it is driven, but since this noise is a high frequency sound wave generated from the high speed rotation of the gas turbine generator 17, it is easily absorbed by the surrounding concrete wall. It doesn't spread outside. Therefore, noise does not reach each facility of the building 1, and no noise obstacle occurs.

Further, the electric power generated by the gas turbine generator 17 is supplied as a power source for electric appliances in the building 1.
As shown in FIGS. 1 and 3, each building 41 has a hall 41 corresponding to its purpose, such as a gymnasium, a movie theater, a theater hall, and other facilities. An illumination device 42 such as an electric lamp, a partition wall of a hall, a motor 43 which is a drive source of a moving bleacher, and an electric device such as a fan 44 for adjusting air in the hall, cooling and heating, and the like are provided. The building 1 has these appliances 42, 43, 4
4 and the gas turbine generator 17 are connected by wiring 45, and the electric appliances 42, 43, 44 are connected to the gas turbine generator 17 individually or via a distribution board 46. Therefore, since it is possible to supply electric power to these electric appliances 42, 43, 44 by driving the gas turbine generator 17, the commercial power supplied from the power plant only needs to make up for the shortage, and the operation of the building 1 can be made inexpensive. can do. Further, in the case of a power failure, the gas turbine generator 17 can supply the minimum necessary amount of power, so that the safety of facilities such as a hospital can be ensured. Further, as will be described later, since the malodorous gas generated in the processing chamber 2 is deodorized by driving the gas turbine generator 17, power generation and malodor removal can be performed simultaneously and efficiently.

Next, the power generation system will be described with reference to FIG. In the figure, 19 is a fuel tank, 20 is a chimney, 21 is a heat storage tank, 22 is an air conditioner, and 23 is a hot water supply tank. The gas passage 24 of the exhaust gas from the gas turbine generator 17 is branched into a first gas passage 25 connected to the heat exchanger 18 and a second gas passage 26 connected to the chimney 20, and the first gas passage 25 is connected to the first gas passage 25. After exiting the heat exchanger 18, the gas passage 25 is connected to the second gas passage 26. Valves 27 and 2 are provided in each gas passage 25 and 26.
8 is arranged to open and close the gas passage and adjust the flow rate, whereby the gas turbine generator 17
Exhaust gas from the heat exchanger 1 mainly flows from the first gas passage 25.
8, but directly from the second gas path 26 to the chimney 20.
It is also possible to be released into the atmosphere by being guided by.
Fuel such as heavy oil is supplied from the fuel tank 19 to the gas terrain generator 17, and air for fuel combustion is supplied from the processing chamber 2. The air in the processing chamber 2 contains malodorous gases such as hydrogen sulfide, phenol, mercaptan, and ammonia generated from various wastewater treatment tanks, and is exposed to a high temperature of 800 ° C. or higher in the gas turbine generator 17. As a result, these are decomposed and turned into malodor. As a method for deodorizing such malodorous gas, conventionally, adsorption of activated carbon, redox treatment, or introduction into the ground and decomposition by bacteria in the ground are performed, but treatment of sewage that generates a large amount of malodorous gas Not only was the operation cumbersome and expensive to apply to facilities, but it was also impossible to completely eliminate odor. In addition, the above malodorous gas has high temperature resistance, and 700 ° C which is generated in general incinerators and diesel engines.
Pyrolysis cannot be performed by the heat of combustion before and after. The gas turbine generator 17 in the present invention is a jet engine 800-
Combustion heat at a high temperature of 850 ° C. is generated and exposed to this high temperature, the malodorous gas is easily decomposed and deodorized. or,
Since it is indispensable to supply a large amount of combustion air to drive the gas turbine generator, even if a large amount of odorous gas is generated from the sewage treatment tank, all of them can be deodorized. Furthermore, the electric power generated by driving the gas turbine generator can be supplied to various facilities such as a residential area, a gymnasium, and a movie theater near the building 1. Therefore, purification of sewage, deodorization of malodorous gas, and power generation can be performed at the same time, which makes it possible to install a sewage treatment facility in a residential area, a downtown area, or the like. Reference numeral 29 is a branch pipe connected to the chimney 20 via a three-way valve 30 and acts so as to guide the air from the processing chamber 2 directly to the chimney 20. This branch pipe 2
9 is used when the air in the processing chamber 2 does not contain a large amount of malodorous gas and does not cause a bad smell in the surroundings, and is directly emitted from the chimney 20 to the atmosphere.
No air supply to 7. As a result, the gas turbine generator 17 is not violated by the malodorous gas and the life can be extended.

The heat exchanger 18 receives the exhaust gas from the gas turbine generator 17, and heats water by the latent heat of the exhaust gas. This heating is performed in two stages to obtain high temperature water having a temperature of about 80 to 85 ° C. and heat storage water having a lower temperature (about 55 to 65 ° C.) than the high temperature water. In the figure, 30 is a high temperature circulation path through which high temperature water circulates,
The high temperature part 18a of the heat exchanger 18, the hot water supply tank 23, and the cooling / heating device 22 are connected so that high temperature water circulates. Reference numeral 31 is a heat storage circulation path through which the heat storage water circulates, and is connected between the heat storage portion 18b of the heat exchanger 18 and the heat storage tank 21 so that the heat storage water circulates. Here, as the heat exchanger 18, a conventionally known one can be used, but the heat exchanger 18 will be described by taking FIG. 4 as an example. In this heat exchanger 18, a plurality of smoke pipes 33 are inserted into a depressurized steam chamber 32 whose inside is maintained at a depressurized state below atmospheric pressure. The heat exchange pipes 34 and 35 are inserted and configured. Further, the heat transfer water 36 is stored in the reduced pressure steam chamber 32, and when the high-temperature exhaust gas from the gas turbine generator 17 flows into the smoke pipe 33, the heat transfer water 36 absorbs the heat and becomes steam, The exchange tubes 34 and 35 are heated to a predetermined temperature to perform heat exchange. Therefore, the high-temperature exhaust gas discharged from the gas turbine generator 17 becomes a low temperature and is discharged from the chimney 20, and the latent heat of the exhaust gas is converted into the heat energy of water,
Effective use of the thermal energy described below is performed. First, the high-temperature water is guided from the high-temperature circulation path 30 to the hot water supply tank 23 and the cooling / heating device 22. The hot water supply tank 23 supplies high-temperature water to the water supply, the shower equipment, the bath, etc., which are piped to the building 1.
On the other hand, the building 1 is provided with air conditioning equipment 37 for air conditioning and heating / cooling of each hall.
8 are provided. The air conditioner 22 uses a heat pump, for example, and drives each air conditioner 38 with high temperature water. Therefore, hot water from the heat exchanger 18 is used for hot water supply and cooling / heating, so that no power supply is required to drive them, and power can be saved. Next, the heat storage water stored in the heat storage tank 21 is applied to the floor heating of the building 1 through the pipe 39. Therefore, under the floor of the building 1, a plurality of pipelines 40 through which the stored heat flows are laid, and when the stored water is supplied to the pipeline 40 by a pump (not shown) or the like, the entire floor becomes hot. It is heated and the floor is heated. As a result, the latent heat of the exhaust gas is used for floor heating, which enables effective use of heat energy. Such floor heating does not generate noise due to air flow unlike air conditioning and heating in which warm air is forcibly sent into the room. Therefore, it is particularly effective in the case where the building 1 is a facility such as a concert hall or a conference hall where noise is a concern because heating without noise interference is possible. In addition, the amount of stored water in the heat storage tank 21 is increased from the place where the yield of the stored heat water is higher than that of the high temperature water.
It is also possible to supply hot water to a hot water pool or the like.

Various modifications can be made in the present invention. The air in the processing chamber may be sucked by a pump as a means for making the processing chamber negative pressure. The heat exchanger may be one that obtains hot water of a single temperature.

<Effects of the Invention> As described above, according to the present invention, the gas turbine generator is used as the power generator, and the air from the sewage treatment tank is supplied as combustion air for the gas turbine generator to achieve deodorization. Various facilities such as a gymnasium, a movie theater, and a sewage treatment facility can be provided in one building. Further, since the odorous pollution is not generated from the sewage treatment facility, the sewage treatment facility can be installed in the residential area and its construction becomes easy. Furthermore, since the surplus energy of the gas turbine generator is used for heating various facilities, it is possible to save heat energy.

[Brief description of drawings]

1 is a schematic sectional view of an embodiment of the present invention, FIG. 2 is a plan view of an underground portion, FIG. 3 is a block diagram of a power generation system, and FIG. 4 is a sectional view of an example of a heat exchanger. 1 ... Building, 2 ... Treatment room, 3 ... Power generation room, 4, 5, 6, 7, 8, 9 ... Wastewater treatment tank, 12 ... Fan, 13 ... Air supply duct, 14 ... Intake duct, 17 ... Gas turbine generator, 18 ... Heat exchanger, 20 ... Chimney, 21 ... Heat storage tank, 22 ... Air conditioner, 23 ... Hot water tank, 30, 31 ... Circulation path, 40 ……pipeline. 42, 43, 44 ... Electric appliances.

Claims (1)

[Claims] 1. A treatment chamber which is provided in an underground portion of a building so as to isolate a sewage treatment tank and whose inside is adjusted to a negative pressure,
Gas turbine generator in which air in the processing chamber is supplied as air for fuel combustion, wiring for supplying electric power from the gas turbine generator to electric appliances arranged in a building, and exhaust gas from the gas turbine generator And a heat exchanger that converts the latent heat of the water into the latent heat of hot water.