JP2011169186A - Waste power generator utilizing solar heat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste power generator utilizing solar heat capable of effectively utilizing the waste heat recovery power generation capacity of a waste power generation facility and improving an electricity generation efficiency when utilizing solar heat for waste power generation. <P>SOLUTION: The waste power generator utilizing solar heat comprises a radiation boiler 2 which forms steam by recovering heat from an exhaust gas discharged from an incinerator, a tube bundle boiler 3 which forms superheated steam by heating the steam formed by the radiation boiler 2 to a higher temperature than a saturated steam temperature, a solar heat collector 19 for collecting solar heat, a solar heat receiver 20 which receives the collected solar heat and thereby further heats the superheated steam formed by the tube bundle boiler 3 to form high temperature superheated steam by heat exchange with the received solar heat, and a steam turbine dynamo 15 which generates electricity by using the formed high temperature superheated steam. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a waste power generation apparatus provided in a waste treatment furnace facility that incinerates or gasifies and melts waste.

  In consideration of the fact that the amount of heat generated by combustion of waste varies depending on the type of waste supplied (for example, 1200 kcal / kg to 2800 kcal / kg-humid basis), Equipped with a corresponding waste heat recovery power generation facility. In recent years, separate collection of waste has progressed, high-calorie plastic waste has been separated, and the calories of waste supplied to the incinerator have decreased, so there is a considerable margin in waste heat recovery power generation equipment capacity. In other words, the waste heat recovery power generation facility capacity is not utilized effectively. Under such circumstances, it is demanded to effectively utilize the waste heat recovery power generation facility capacity of the existing waste power generation facility. On the other hand, it is not desirable to burn fossil fuels to increase the amount of superheated steam and increase the amount of power generation because it is against the response to global warming.

  As an example of a waste power generation facility, a waste incinerator is equipped with a boiler, the waste heat of exhaust gas discharged from the incinerator is recovered, water is heated and evaporated in the boiler to produce saturated steam, a combustion type The saturated steam is further heated by a superheater to generate superheated steam, and the superheated steam is supplied to a steam turbine for power generation. (See Patent Document 1).

  The power generation device disclosed in Patent Document 1 is implemented, for example, with the configuration shown in FIG. That is, first, in the radiant boiler 2 in which the evaporation pipe is arranged, after the water in the evaporation pipe is heated by the exhaust gas discharged from the waste incinerator (not shown) to generate saturated steam, In FIG. The saturated steam is further superheated by the tube group boiler 3 in which the superheated tubes are arranged, and becomes superheated steam. On the other hand, the water separated by the steam reservoir 12 is returned to the radiation boiler 2. After passing through the superheated steam header 14, the superheated steam is supplied to the steam turbine generator 15, and contributes to power generation by driving the steam turbine generator 15. The superheated steam that has driven the steam turbine generator 15 is condensed by the condenser 16 and returned to the water, preheated by the feed water preheating economizer 17, and then sent to the radiation boiler 2. The water supply preheating economizer 17 is supplied with makeup water softened by the water softener 18.

  On the other hand, as another form of the power generation apparatus, a power generation apparatus using solar heat may be used. As such a solar thermal power generation device, one disclosed in Patent Document 2 is known. In Patent Document 2, a liquid heat medium is heated by solar heat, water is evaporated through the heat medium to generate saturated steam, and then the saturated steam is generated by the combustion gas used to drive the gas turbine. Further, there is disclosed a power generation apparatus that generates heat by generating superheated steam by supplying the superheated steam to a steam turbine.

JP 7-035311 A JP2008-039367

  However, in the power generation device of Patent Document 2, water is heated by a heat medium heated by solar heat to generate saturated steam, and the saturated steam is further heated by combustion gas to generate superheated steam. Part is consumed by the latent heat of vaporization of water. As a result, the contribution of solar heat to power generation is reduced. For example, even if the power generation device of Patent Document 2 described above is applied as a power generation device for a waste power generation facility, only about 10% of the received solar heat contributes to power generation, which is not desirable because of low efficiency.

  In addition, the use of a heat medium results in excessive facilities. Furthermore, if the heat storage function is to be held by the heat medium, expensive equipment such as a tank for storing the heat medium, a circulation pump, a heat insulating material for those apparatuses, a heat medium flow control device, etc. is required. Will increase.

  In view of the above problems, the present invention can effectively utilize the waste heat recovery power generation facility capacity of the waste power generation facility, and can also improve the power generation efficiency when using solar heat for waste power generation. It is an object to provide a waste power generation apparatus.

  Thermal energy effective for power generation by a steam turbine using waste heat recovery steam will be described with reference to FIG. FIG. 8 is a water-steam enthalpy line showing the relationship between temperature and enthalpy when hot water pressurized to 40 atm is evaporated at 249 ° C. to become saturated steam and then heated to become superheated steam. FIG.

  As shown in FIG. 8, the superheated steam portion is mainly used for the enthalpy of steam effective for power generation in the steam turbine. This is because it is difficult to use wet steam due to restrictions on the strength and durability of the turbine blade of the steam turbine. Here, by applying the condenser, a part of the steam enthalpy portion of the saturated steam temperature under the pressurizing condition of FIG. 8 can be utilized.

  In order to improve power generation efficiency, it is possible to convert more steam enthalpy into electricity by installing a condenser to reduce turbine outlet pressure and reducing steam wetness. About 20% can be converted into electric power.

  The inventors pay attention to the fact that saturated steam is already generated by exhaust gas from a combustion furnace or gasification melting furnace in waste power generation, and a process of obtaining superheated steam from the saturated steam and a process of increasing the amount of superheated steam. By using solar heat, it is possible to convert the amount of heat received from solar heat into electric power with a efficiency that is more than twice as high as when generating saturated steam with solar heat and then generating superheated steam with combustion gas. I found out that I can do it.

  This effect of using solar heat is obtained on the condition that the amount of heat generated by collecting solar heat is used for direct heating of steam, and that heat supply at a temperature exceeding at least the saturated steam temperature is possible.

  A solar heat-generating waste power generation apparatus according to the present invention is a waste power generation apparatus provided in a waste treatment furnace facility for incinerating or gasifying and melting waste, and recovers heat from exhaust gas discharged from the waste treatment furnace. Steam generated by the boiler, a solar heat collector that collects solar heat, and the collected solar heat are received, and the steam generated by the boiler is heated to a temperature higher than the saturated steam temperature by heat exchange with the received solar heat. A solar heat receiving device that performs at least one of superheated steam generation that generates superheated steam and superheated steam heating that further heats the superheated steam generated by the boiler, and a steam turbine power generator that generates electric power using the generated superheated steam. It is characterized by providing.

  In the present invention, when saturated steam or superheated steam is generated in a boiler, and when saturated steam is generated in the boiler, solar heat is used for generation and heating of the superheated steam, and when superheated steam is generated in the boiler Uses solar heat to heat the superheated steam. Thus, by utilizing solar heat for the generation or heating of superheated steam, the electrical conversion efficiency of the solar heat can be greatly increased.

  According to the present invention, it is possible not only to effectively utilize the power generation facility capacity by adding a device using solar heat to the existing waste power generation facility, but also to improve the power generation efficiency even in the new waste power generation facility. is there.

  It is preferable that the mechanism for performing heat exchange between the solar heat received by the solar heat receiving device and the superheated steam is installed in a flow path for supplying the superheated steam generated by the boiler to the steam turbine. Since the mechanism is installed in the flow path, solar heat is reliably utilized for generation or heating of superheated steam, so that power generation efficiency can be further increased.

  A solar thermal waste power generation device is a sensor that detects solar heat reception in a solar heat receiving device, and when the sensor detects solar heat reception or when the amount of solar heat received by the sensor is greater than or equal to a predetermined value. It is preferable to provide steam supply control means for supplying steam to the solar heat receiving device.

  Even if the solar heat receiving device is not receiving solar heat, or even if it is receiving heat, the heat loss will occur if steam or water is passed through the solar heat receiving portion when the amount of heat received is insufficient. The generation of heat loss can be avoided by flowing steam or water through the solar heat receiving part only when the amount of heat received is sufficient. Further, by supplying superheated steam to the solar heat receiving device when the amount of heat received is sufficient, damage to the solar heat receiving device due to overheating can be avoided.

  Provided with a sensor that detects solar heat reception in the solar heat receiving device, the solar heat receiving device, when the sensor does not detect solar heat received or when the amount of solar heat received by the sensor is less than a predetermined value, It is preferable to have a mechanism that covers the heat receiving surface with a heat insulating material or a heat insulating material that suppresses heat dissipation from the heat receiving surface of the solar heat receiving device.

  During the day, when the amount of solar radiation is reduced due to weather changes (for example, cloudy weather or showers), and sunlight is not sufficiently incident on the solar heat receiving part of the solar heat receiving device, that is, when solar heat is not received Alternatively, even when the amount of heat received is not sufficient, by providing the mechanism, heat dissipation from the heat receiving surface can be suppressed and heat loss can be reduced. As a result, when the heat reception of solar heat is resumed or when the heat reception amount returns to a sufficient amount, the heating heat amount of superheated steam generation or superheated steam heating can be returned to a predetermined level in a short time, and the heating heat amount by solar heat Fluctuations can be suppressed.

  When the solar heat receiving device is not receiving solar heat or when the solar heat receiving amount is not more than a predetermined value, it is preferable to include a combustion device that performs at least one of superheated steam generation and superheated steam heating. As a result, even when the solar heat receiving device does not receive solar heat or when the amount of heat received is not sufficient even if the solar heat receiving device receives heat, superheated steam generation or superheated steam heating can be performed by the combustion device.

  In the solar heat receiving device, it is preferable that a superheated steam pipe for generating superheated steam is provided on the heat receiving surface side, and a pressurized hot water pipe or an evaporation pipe is provided in contact with the back surface of the superheated steam pipe.

  According to such a configuration, the solar heat is first consumed and consumed in the production or heating of the superheated steam in the superheated steam pipe located on the heat receiving surface side. The solar heat that has not been consumed in the superheated steam pipe conducts heat from the superheated steam pipe to the pressurized hot water pipe or the evaporation pipe (pressurized water pipe) that is maintained at the saturated steam temperature. As a result, the solar heat receiving surface is not overheated even if the amount of solar heat incident is greatly increased, and damage is prevented. In the pressurized hot water pipe or the evaporation pipe, the heat-transferred solar heat is consumed for heating and evaporation of water. The saturated steam temperature is constant, and the latent heat of vaporization is larger than the specific heat / sensible heat of the steam. Therefore, the steam is maintained at the saturated steam temperature in the pressurized hot water pipe or the evaporation pipe.

  In the solar heat receiving device, a superheated steam pipe for generating superheated steam is provided on the heat receiving surface side, and a pressurized hot water pipe or an evaporation pipe may be provided with a gap on the back surface of the superheated steam pipe.

  According to such a configuration, when performing solar heat receiving when the temperature of the superheated steam pipe is equal to or lower than a predetermined temperature, the superheated steam pipe and the pressurized hot water pipe or the evaporation pipe are insulated by the gap. When the temperature of the superheated steam pipe exceeds a predetermined temperature, the gap is eliminated due to the thermal expansion of the superheated steam pipe, and the superheated steam pipe is brought into contact with the pressurized hot water pipe or the evaporation pipe to remove heat. As a result, it is possible to prevent the superheated steam pipe from being heated and damaged at a temperature higher than a predetermined temperature, and to use the solar heat transferred from the superheated steam pipe to the pressurized hot water pipe or the evaporation pipe as pressurized hot water heating or evaporation heat. The predetermined temperature of the superheated steam pipe is set based on a limit temperature at which the high temperature strength of the superheated steam pipe decreases.

  The solar heat receiving device preferably has a heat storage material inside the solar heat receiving device. In this way, by providing a heat storage material inside the solar heat receiving device, the solar heat can be stored in the heat storage material even if the amount of solar heat received changes, so a device that circulates or stores the liquid heat medium is used. The amount of heat received can be smoothed. Moreover, since the heat medium is not used, the equipment can be reduced in size and cost.

  ADVANTAGE OF THE INVENTION According to this invention, when using solar heat for waste power generation, power generation efficiency can be improved, As a result, the waste heat recovery power generation equipment capability of a waste power generation equipment can be utilized effectively. Moreover, not only can the power generation facility capacity be effectively utilized by adding a device that uses solar heat to the existing waste power generation facility, but there is also an effect that the power generation efficiency can be further improved in the new waste power generation facility.

It is a figure which shows the outline of the waste processing furnace facility in 1st embodiment. It is a block diagram which shows the structure of the electric power generating apparatus provided in the waste processing furnace facility of FIG. (A) is a figure which shows the structure of the solar thermal collector and solar thermal receiver in the electric power generating apparatus of FIG. 2, (B) is an enlarged view of this solar thermal receiver. It is a block diagram which shows the structure of the electric power generating apparatus which concerns on 2nd embodiment. It is a figure which shows the solar heat receiving device in the electric power generating apparatus which concerns on 3rd embodiment. It is a figure which shows the solar heat receiving device in the electric power generating apparatus which concerns on 4th embodiment. It is a block diagram which shows the structure of the conventional electric power generating apparatus. It is a water-steam enthalpy diagram which shows the relationship between water temperature and enthalpy.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a solar thermal power generation apparatus according to the present invention will be described with reference to the accompanying drawings.

<First embodiment>
FIG. 1 is a diagram showing an outline of a waste treatment furnace facility in the present embodiment. FIG. 2 is a block diagram showing a configuration of a power generation apparatus provided in the waste treatment furnace facility of FIG. FIG. 3A is a diagram illustrating a configuration of the solar heat collecting device and the solar heat receiving device in the power generation device of FIG. 2, and FIG. 3B is an enlarged view of the solar heat receiving device. 3A and 3B, the superheated steam pipe and the pressurized hot water pipe are shown in a cross section perpendicular to the axis.

  As shown in FIG. 1, the waste treatment furnace facility partially includes an incinerator 1 for incinerating waste, and a radiant boiler 2 and a tube group boiler 3 installed on the downstream side of the incinerator 1. And a later-described solar heat waste generation device 10 (hereinafter simply referred to as “power generation device 10”) and an exhaust gas treatment device 4 installed on the downstream side of the tube group boiler 3. Instead of the incinerator 1, a gasification melting furnace may be provided.

  As shown in FIG. 1, the power generation device 10 includes an evaporation pipe 11 connected to the steam reservoir 12 on the upstream side of the steam reservoir 12, and an overheat connected to the steam reservoir 12 on the downstream side of the steam reservoir 12. It has a tube 13 in part. The evaporation pipe 11 is arranged in the radiation boiler 2, and the superheated pipe 13 is arranged in the tube group boiler 3.

  As shown in FIG. 2, the power generation device 10 has a configuration in which a solar heat collecting device 19 and a solar heat receiving device 20 are added to the conventional power generation device in FIG. 7. Here, the solar heat collecting device 19 and the solar heat receiving device 20 will be mainly described, and the same parts as those of the conventional power generating device will be denoted by the same reference numerals and the description thereof will be omitted.

  A plurality of the solar heat collecting devices 19 are installed on the roof or site of the waste treatment furnace facility. The solar heat collecting device 19 includes a reflecting mirror and a direction control device (not shown) that controls the direction and inclination of the reflecting mirror in accordance with the movement of the sun.

  As shown in FIG. 1, the solar heat receiving device 20 is installed in a flow path for supplying superheated steam generated by a superheated pipe 13 disposed in the tube group boiler 3 to the steam turbine generator 15. In addition, as shown in FIG. 3, the solar heat receiving device 20 has two pipes, that is, a superheated steam pipe 21 and a pressurized hot water pipe 22 that extend in parallel to each other. The superheated steam pipe 21 is located on the heat receiving surface side for receiving and receiving sunlight reflected by the reflecting mirror of the solar heat collector 19. As is often seen in FIG. 3B, the pressurized hot water pipe 22 is arranged in contact with the superheated steam pipe 21 on the back surface (opposite to the heat receiving surface) of the superheated steam pipe 21. There is warm water inside.

  In the present embodiment, as shown in FIG. 2, the superheated steam generated in the tube group boiler 3 is sent to the superheated steam pipe 21 of the solar heat receiving device 20 through the superheated steam header 14. As described above, since the superheated steam pipe 21 receives and receives sunlight from the heat receiving surface, the superheated steam is further heated in the superheated steam pipe 21 by solar heat. The superheated steam heated by the solar heat (hereinafter referred to as “high temperature superheated steam”) is supplied to the steam turbine generator 15 and contributes to power generation by driving the steam turbine generator 15.

  In the present embodiment, most of the solar heat received by the heat receiving surface of the solar heat receiving device 20 is first used for generating high-temperature superheated steam by heating the superheated steam in the superheated steam pipe 21 located on the heat receiving surface side. Is consumed. Then, the solar heat that has not been consumed in the superheated steam pipe 21 conducts heat from the superheated steam pipe 21 to the pressurized hot water pipe 22 arranged in contact with the superheated steam pipe 21. Therefore, even if the solar heat received by the heat receiving surface of the solar heat receiving device 20 is greatly increased, the superheated steam pipe 21 is not overheated and is prevented from being damaged.

  Further, in the pressurized hot water pipe 22, the heat-transferred solar heat is consumed for water heating and evaporation. The saturated steam temperature is constant, and the latent heat of vaporization is larger than the specific heat / sensible heat of the steam, so that the steam is maintained at the saturated steam temperature in the pressurized hot water pipe 22.

  In this embodiment, saturated steam and superheated steam are generated by the recovered waste heat of the exhaust gas from the incinerator 1, and the superheated steam is heated by solar heat to generate high-temperature superheated steam. Thus, by using solar heat only for the production of high-temperature superheated steam, the electrical conversion efficiency of the solar heat can be greatly increased, and the waste heat recovery power generation facility capacity of the waste power generation facility can be effectively utilized. Specifically, the power conversion efficiency of solar heat can be increased to 4 times or more, that is, 40% or more of the conventional thermal power conversion apparatus according to the present embodiment.

  Moreover, in this embodiment, the solar heat receiving device 20 is installed in the flow path which supplies the superheated steam produced | generated by the superheat pipe 13 distribute | arranged in the tube group boiler 3 to the steam turbine generator 15, and solar heat is made into high temperature. Since it can be reliably used for the generation of superheated steam, the power generation efficiency can be further increased.

  Waste heat recovery boilers in conventional waste power generation facilities contain exhaust gas containing halogen compounds, sulfur compounds and other corrosive components, so waste heat recovery is performed at a temperature where boiler corrosion does not occur. The steam temperature obtained was limited to 400 ° C. According to this embodiment, since the solar heat receiving device 20 does not require a countermeasure against the corrosive component in the exhaust gas, the superheated steam can be increased to 450 ° C. to 550 ° C. by efficiently collecting heat, Higher power generation efficiency can be obtained.

  In the present embodiment, solar heat is used to generate high-temperature superheated steam, but instead, this solar heat may be used to generate both superheated steam and high-temperature superheated steam. That is, it is possible to supply saturated steam into the superheated steam pipe 21 and superheat the saturated steam with solar heat in the superheated steam pipe 21 to generate superheated steam and further high-temperature superheated steam.

  In the present embodiment, the pressurized hot water pipe is arranged on the back surface of the superheated steam pipe, but an evaporation pipe may be provided instead.

<Second embodiment>
The power generation device according to the present embodiment controls a sensor that detects the amount of solar heat received by the solar heat receiving device, and the supply of steam to the solar heat receiving device and the steam turbine generator in accordance with the amount of heat detected by the sensor. It differs from the electric power generating apparatus of 1st Embodiment which does not have this sensor and a steam supply control apparatus by the point which has the steam supply control apparatus as a steam supply control means to perform. Here, it demonstrates centering on the said sensor and a vapor | steam supply control apparatus, and attaches | subjects the same code | symbol about the part same as 1st embodiment, and abbreviate | omits description.

  FIG. 4 is a block diagram illustrating a configuration of the power generation device according to the present embodiment. As shown in FIG. 4, the power generation device 10 ′ according to the present embodiment includes a sensor 23 that detects the amount of solar heat received by the solar heat receiving device 20, and solar heat reception according to the amount of heat received by the sensor 23. And a steam supply control device 24 that controls the supply of steam to the apparatus 20 and the steam turbine generator 15.

  In the present embodiment, a valve 25 is provided in a pipe connecting the superheated steam header 14 and the solar heat receiving device 20, and a valve 26 is provided in a pipe connecting the superheated steam header 14 and the steam turbine generator 15. ing. The steam supply control device 24 can control the operation of the valves 25 and 26 to adjust the steam supply amount.

  The steam supply control device 24 opens the valve 25 to supply superheated steam to the solar heat receiving device 20 when the amount of heat received by the sensor 23 is equal to or greater than a preset threshold value.

  When the amount of heat received by the solar heat receiving device 20 is not sufficient, heat loss occurs when superheated steam is supplied to the solar heat receiving device 20, but in this embodiment, a threshold for the amount of heat received is set in advance, and the amount of received heat is Since the superheated steam is supplied to the solar heat receiving device 20 only when it is equal to or higher than the threshold, the occurrence of the heat loss can be avoided. Further, when the amount of heat received is sufficient, supplying the superheated steam to the solar heat receiving device 20 can avoid damage to the solar heat receiving device 20 due to overheating.

  The steam supply control device 24 controls the opening and closing of the valve 26 as follows. A temperature sensor (not shown) for measuring the temperature (Ti) of superheated steam supplied to the solar heat receiving device 20, a temperature sensor (not shown) for measuring the temperature (To) of superheated steam discharged from the solar heat receiving device, and When a temperature sensor (not shown) for measuring the temperature (Ts) of the superheated steam in the solar heat receiving device 20 is provided and the superheated steam is supplied to the solar heat receiving device 20, at least one of Ti ≧ To and Ti ≧ Ts. In one case, the valve 26 is closed and all the superheated steam discharged from the superheated steam header 14 is supplied to the solar heat receiving device 20, and when at least one of Ti <To and Ti <Ts, the valve 26 is appropriately opened. A portion of the superheated steam that opens at a high temperature and is discharged from the superheated steam header 14 is supplied to the steam turbine generator 15 without passing through the solar heat receiving device 20, so that the solar heat receiving device 2. Adjust the superheated steam amount supplied to avoid damage due to overheating of the solar heat receiving unit 20. The opening degree of the valve 26 is adjusted so that the temperature (Ts) of the superheated steam in the solar heat receiving device 20 falls within a predetermined range.

  In the present embodiment, the steam supply control device 24 performs control so that superheated steam is supplied when the amount of heat received is equal to or greater than a predetermined threshold value. It is good also as controlling so that superheated steam may be supplied to the solar heat receiving apparatus 20, when the sensor 23 detects heat reception.

  The solar heat receiving device 20 has a mechanism that covers the heat receiving surface of the solar heat receiving device 20 with a heat insulating material or a heat insulating material when the solar heat received amount detected by the sensor 23 is equal to or less than a preset threshold value. You may have. For example, the operation of the mechanism can be controlled by the steam supply control device 24 based on the amount of heat received by the sensor 23.

  By providing such a mechanism, the amount of solar radiation is reduced due to the influence of changes in the weather (for example, cloudy weather or showers) during the day, and sunlight does not sufficiently enter the heat receiving surface of the solar heat receiving device 20. Even so, the heat receiving surface can be covered with a heat insulating material or a heat insulating material by the mechanism to suppress heat dissipation from the heat receiving surface to reduce heat loss. As a result, when the heat reception of solar heat is resumed or when the heat reception amount returns to a sufficient amount, the heating heat amount of superheated steam generation or superheated steam heating can be returned to a predetermined level in a short time, and the heating heat amount by solar heat Fluctuations can be suppressed. It goes without saying that the heat receiving surface may be covered with a heat insulating material or a heat insulating material when the sensor 23 does not detect any heat received by solar heat.

  Further, the solar heat receiving device 20 may have a combustion device such as a combustion burner that performs superheated steam heating when the solar heat received amount detected by the sensor 23 is equal to or less than a preset threshold value. Good. For example, based on the amount of heat received by the sensor 23, the steam supply control device 24 can control the supply of fuel to the combustion equipment and the operation of the combustion equipment. .

  By providing such a combustion device, even if the amount of heat received is not sufficient, superheated steam heating can be performed by the combustion device. It goes without saying that the superheated steam heating by the combustion device may be performed when the sensor 23 does not detect any heat received from the solar heat.

<Third embodiment>
The power generation device according to the present embodiment is different from the power generation device according to the first embodiment in which the heat storage material is not provided in that the heat storage material is provided inside the solar heat receiving device. In this embodiment, it demonstrates centering on this solar heat receiving apparatus, and attaches | subjects the same code | symbol to the part same as 1st embodiment, and abbreviate | omits description.

  FIG. 5 is a diagram showing a solar heat receiving device in the present embodiment. As shown in FIG. 5, in the solar heat receiving device 20, a portion (a right half portion in FIG. 5) excluding the heat receiving surface side portion in the superheated steam pipe 21 and the entire periphery of the pressurized hot water pipe 22 store heat. It is covered with a material 27.

The heat storage material 27 is, for example, a solid metal oxide or a heat transfer oil, preferably a molten salt (NaNO ₃ , KNO ₃ , NaCl, Na ₂ CO ₃ or the like) as a phase change material having a large heat capacity, and more preferably , Metal hydroxide (iron hydroxide (heat storage temperature 300 to 400 ° C.)), alkaline earth carbonate (MgCO ₃ (heat storage temperature 450 ° C.)), alkaline earth hydroxide (Ca (OH) ₂ (heat storage temperature) 540 [deg.] C.)) and the like.

  In this embodiment, by covering the superheated steam pipe 21 and the pressurized hot water pipe 22 with the heat storage material 27 in this way, the solar heat can be stored in the heat storage material 27 even if the amount of received heat of the solar heat changes. The amount of heat received can be smoothed without using a device that circulates or stores the medium.

<Fourth embodiment>
The power generator according to this embodiment is different from the power generator according to the third embodiment in that the superheated steam pipe and the pressurized hot water pipe are arranged with a gap in the solar heat receiving device.

  FIG. 6 is a diagram illustrating a solar heat receiving device in the power generation device according to the present embodiment. As shown in FIG. 6, the pressurized hot water pipe 22 is provided with a gap on the back surface of the superheated steam pipe 21. A heat storage material 27 is provided around the pressurized hot water pipe 22.

  In the solar heat receiving device 20 in the present embodiment, when the temperature of the superheated steam pipe 21 is equal to or lower than a predetermined temperature, the superheated steam pipe 21 and the pressurized hot water pipe 22 are insulated by the gap. When the temperature of the superheated steam pipe 21 exceeds a predetermined temperature due to receiving solar heat, the above-mentioned gap disappears due to the thermal expansion of the superheated steam pipe 21, and the superheated steam pipe 21 comes into contact with the pressurized hot water pipe 22 to remove heat. It is. As a result, it is possible to prevent the superheated steam pipe 21 from being heated and damaged at a temperature higher than a predetermined temperature, and to use solar heat transferred from the superheated steam pipe 21 to the pressurized hot water pipe 22 for heating the pressurized hot water. The predetermined temperature of the superheated steam pipe 21 is set based on a limit temperature at which the high temperature strength of the superheated steam pipe 21 decreases.

  The present invention relates to a waste power generation apparatus, but is applied to a power generation apparatus that uses waste heat from a processing furnace that incinerates or gasifies and melts sludge, biomass, peat, etc., which can be said to be a low-calorie fuel similar to waste. As with the waste power generation apparatus, the power generation efficiency improvement effect can be obtained.

The Example which implemented the electric power generating apparatus which concerns on 1st embodiment is described. The site area of the solar heat collector of the power generator is 10,000 m ² . Assuming that the site effective area rate is 50% and the amount of heat received per area is 68.32w / m ² , the amount of heat received by the solar heat receiving device is 341kw, and if the heat receiving efficiency is 75%, it is heated by the received solar heat. The amount of power generated by the superheated steam is 256 kw.

  The case where the power generation device having the above-described solar heat receiving device is applied to a waste incinerator having an incinerator capacity of 200 t / day will be described. Here, assuming that the waste heat generation amount is 2200 kcal / kg, the waste heat amount generated by waste incineration is 21300 kw, the power generation amount by waste heat recovery is 3200 kw, and the power generation is a ratio of the power generation amount to the heat input amount. The efficiency is 15.0%. As a result of applying the power generation device having the solar heat receiving device, the total heat input amount of the waste heat amount and the solar heat received amount is 21642 kw, and the total power generation amount is 3456 kw, so the power generation efficiency is 16.0%, and the solar heat heat receiving device The power generation efficiency can be increased by 1.0%.

1 Incinerator (waste treatment furnace)
2 Radiation boiler 3 Tube group boiler 10, 10 'Power generator (waste power generator)
15 Steam turbine generator (steam turbine generator)
DESCRIPTION OF SYMBOLS 19 Solar thermal collector 20 Solar thermal receiver 21 Superheated steam piping 22 Pressurized hot water piping 23 Sensor 24 Steam supply control apparatus (steam supply control means)
26 Heat storage material

Claims (8)

A waste power generation apparatus installed in a waste treatment furnace facility for incineration or gasification melting of waste,
A boiler that generates steam by recovering heat from the exhaust gas discharged from the waste treatment furnace;
A solar heat collector for collecting solar heat;
The superheated steam generated by the boiler that generates the superheated steam by heating the steam generated in the boiler to a temperature higher than the saturated steam temperature by receiving the collected solar heat and heat exchange with the received solar heat. Further, a solar heat receiving device that performs at least one of heating superheated steam heating,
A steam turbine power generation device that generates electric power using the generated superheated steam;
A waste heat power generation apparatus using solar heat.   The mechanism for performing heat exchange between solar heat received by the solar heat receiving device and superheated steam is installed in a flow path for supplying superheated steam generated by a boiler to a steam turbine. Solar thermal waste power generation system. A sensor for detecting the heat received by the solar heat receiving device;
Steam supply control means for supplying steam to the solar heat receiving device when the sensor detects solar heat reception or when the amount of solar heat received by the sensor is equal to or greater than a predetermined value;
The solar-powered waste power generation apparatus according to claim 1 or 2, wherein It is equipped with a sensor that detects the heat received by the solar heat receiving device,
The solar heat receiving device is a heat retaining device that suppresses heat dissipation from the heat receiving surface of the solar heat receiving device when the sensor does not detect solar heat receiving or when the amount of solar heat received by the sensor is a predetermined value or less. The solar thermal waste power generation apparatus according to any one of claims 1 to 3, further comprising a mechanism for covering the heat receiving surface with a material or a heat insulating material.   A combustion apparatus that performs at least one of superheated steam generation and superheated steam heating when the solar heat receiving device is not receiving solar heat or when the amount of solar heat received is a predetermined value or less. Item 5. A solar thermal power generation power generation device according to any one of Items 4 to 4.   The solar heat receiving device is characterized in that a superheated steam pipe for generating superheated steam is provided on the heat receiving surface side, and a pressurized hot water pipe or an evaporation pipe is provided in contact with the back surface of the superheated steam pipe. The solar-powered waste power generation apparatus according to any one of claims 1 to 5.   The solar heat receiving device is characterized in that a superheated steam pipe for generating superheated steam is provided on the heat receiving surface side, and a pressurized hot water pipe or an evaporation pipe is provided with a gap at the back of the superheated steam pipe. The solar heat-utilized waste power generation apparatus according to any one of claims 1 to 5.   The solar heat receiving device has a heat storage material inside the solar heat receiving device, and the solar heat-use waste power generation device according to any one of claims 1 to 7.

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