JP2015075325A - Waste treatment facilities and thermal insulation method of duct collector in waste treatment facilities - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide waste treatment facilities with a plurality of treatment systems, capable of efficient thermal insulation of a dust collector in an inactive treatment system.SOLUTION: Waste treatment facilities include: a first treatment system 10A that includes a first combustion furnace 12A, a first boiler 14A, and a first dust collector 16A; a second treatment system 10B that includes a second combustion furnace 12B, a second boiler 14B, and a second dust collector 16B; a steam receiving unit 30 receiving steam generated by the boiler 14A or 14B; thermal insulation units 40A, 40B, and 50 condensing the steam received by this steam receiving unit 30 and thermally insulating the dust collector 16A or 16B in the inactive treatment system 10A or 10B; and a turbine 24 converting energy of the steam to power while dropping a pressure of the steam generated by the boiler 14A or 14B, the steam receiving unit 30 receives the steam at the pressure that is dropped by the turbine 24 and that is higher than an atmospheric pressure.

Description

  The present invention relates to a waste treatment facility for burning waste such as garbage, collecting the exhaust gas generated by the combustion, and then discharging the waste, and a method for keeping warm the dust collector for the dust collection. It is about.

  In general, a waste treatment facility for treating waste such as waste by burning includes a combustion furnace for burning the waste, and a dust collector for removing dust from the exhaust gas generated by the combustion. The gas after dust collection is discharged to the outside. In this facility, it is important to keep the dust collector warm while the operation is stopped. Specifically, when the operation of the combustion furnace is stopped, the temperature inside the dust collector on the downstream side of the combustion furnace is lowered, and this tends to cause low temperature corrosion and deliquescence of chemicals used (for example, slaked lime). It is desirable that the inside of the dust collector be kept at a relatively high temperature (for example, 110 ° to 120 ° C.) even when the operation is stopped.

  Conventionally, as described in Patent Document 1, as a device for maintaining the temperature of the dust collector during such operation stop, a means for circulating the air while passing the air through the dust collector, and the circulation What is provided with the heater which heats air is known. However, this apparatus has a problem that a large amount of power is consumed to keep the dust collector warm.

  Therefore, in Patent Document 2, in the equipment having a plurality of waste treatment systems each including the combustion furnace and the dust collector, the exhaust gas flowing through the operating system to the dust collector included in the stopped system is disclosed. There is disclosed a technique for keeping a dust collector included in a stopped system by supplying thermal energy. Specifically, a part of the exhaust gas flowing through the operating system is supplied directly to the dust collector included in the stopped system, or the gas is circulated through the dust collector included in the stopped system. Heat exchange is performed between the circulating gas and the exhaust gas flowing through the operating system.

Japanese Patent No. 3209913 JP 2012-42155 A

  In the technique described in Patent Document 2, heat exchange is performed between the exhaust gas flowing through the operating processing system and the dust collector (or the heat medium flowing through the dust collector) in the stopped processing system. In addition, a large heat exchanger and a large exhaust gas distribution pipe are required, and the increase in the size of the entire equipment is unavoidable. In addition, when the temperature of the exhaust gas decreases due to heat exchange in the heat exchanger, the corrosiveness of the exhaust gas increases, and therefore, corrosion of the pipe (corrosion of the pipe on the downstream side of the heat exchanger) due to this is avoided. For this purpose, the exhaust gas outlet temperature of the heat exchanger must be kept high to some extent. In other words, there are significant restrictions on the drop in outlet temperature. In order to perform heat exchange sufficient to keep the dust collector warm under such severe restrictions on the outlet temperature, the flow rate of exhaust gas in the heat exchanger must be further increased. This leads to further enlargement of the exchanger and exhaust gas piping.

  In view of such circumstances, the present invention is a waste treatment facility provided with a plurality of treatment systems, and efficiently keeps the temperature of the dust collector in the stopped treatment system while suppressing an increase in the size of the facility. It is an object of the present invention to provide a method capable of maintaining the temperature of the dust collecting device.

  As means for solving the above-mentioned problems, the present inventors paid attention to a boiler provided at the rear stage of the combustion furnace. In this boiler, water is boiled by the heat of the exhaust gas discharged from the combustion furnace, and the temperature of the exhaust gas is effectively lowered by using the latent heat of vaporization to effectively protect the subsequent dust collector. In addition, by using the heat of condensation of the steam generated in the boiler, it is possible to efficiently keep the temperature of the dust collector in the stopped processing system with relatively small equipment. It becomes possible.

  This invention is made | formed based on this viewpoint, and provides the waste treatment facility which can solve the said subject. This facility includes a first combustion furnace for burning waste, a first boiler for generating steam by boiling water with heat of exhaust gas generated by combustion in the first combustion furnace, and cooling by the first boiler A first treatment system including a first dust collector for removing dust in the exhaust gas generated, a second combustion furnace for burning waste, and water from the heat of the exhaust gas generated by combustion in the second combustion furnace A second boiler for generating steam by boiling, a second treatment system including a second dust collector for removing dust in the exhaust gas cooled by the second boiler, and the first boiler and the second boiler. A steam receiving unit that receives each generated steam, and the steam received by the steam receiving unit is condensed, and the heat of condensation is retained by the heat of condensation in the stopped processing system of the first and second processing systems. Includes a heat insulation unit that performs, the.

  In addition, with respect to the heat retaining unit, “the heat is retained by the heat of condensation” is not intended to be limited to the heat retaining only using the heat of condensation, and a wide range of materials that perform heat retaining at least using the heat of condensation. It is a purpose to include. Therefore, the heat retaining unit may utilize both the heat of condensation (that is, latent heat) of steam and sensible heat.

  According to this facility, by using the condensation heat, that is, latent heat, of steam generated by the boiler belonging to the operating processing system of the first boiler and the second boiler, the dust collector belonging to the stopped processing system is used. Heating can be performed efficiently. That is, it is possible to perform heat exchange sufficient for heating the dust collector in the stopped processing system with a small steam flow rate. Therefore, compared to the conventional case where heat exchange is performed between the exhaust gas flowing through the processing system in operation and the dust collector, a small facility, for example, a heat exchanger with a small flow rate specification and a small-diameter pipe are used. A heat insulation part can be comprised. Further, even when the temperature of the steam drops due to the heat exchange, water or wet steam is generated due to this, and its corrosivity is extremely low as compared with exhaust gas whose temperature has been lowered.

Waste disposal plant according to the present invention further example Bei the turbine the first or energy of the steam while lowering the pressure of the steam generated in the second boiler to convert the power, the vapor receiving part is the It accepts steam whose pressure has been lowered by the turbine and has a pressure higher than atmospheric pressure . In this case, the steam is preferably extracted from a middle stage between the inlet and the outlet of the turbine. The range of the pressure of the extracted steam is preferably a range in which a condensation point of 100 ° C. or higher can be secured, for example, a gauge pressure range of 0.1 MPa to 4 MPa (more preferably 0.2 MPa to 1.2 MPa). Is preferred.

  In this way, the energy of the high-pressure steam is first converted into power by the turbine, and by this condensing the steam whose pressure has dropped, that is, close to the saturated steam pressure, the power (kinetic energy) is converted from the steam. Both the thermal energy for heat retention of the dust collector can be efficiently recovered.

  The present invention also provides a first combustion furnace that burns waste, a first boiler that generates steam by boiling water with the heat of exhaust gas generated by combustion in the first combustion furnace, and the first boiler. A first treatment system including a first dust collector for removing dust in the cooled exhaust gas, a second combustion furnace for burning waste, and water generated by heat of the exhaust gas generated by combustion in the second combustion furnace And a second treatment system including a second dust collector for removing dust in the exhaust gas cooled by the second boiler. Provided is a method for keeping a dust collector belonging to a processing system of which operation is stopped among the first and second processing systems as a heat retaining object. This method condenses steam generated in a boiler belonging to an operating processing system among the first boiler and the second boiler, and is stopped in the first and second processing systems due to the heat of condensation. Insulating the dust collector in the processing system.

In this method, further comprising converting the raw made vapor by the first or second boiler energy of the steam while lowering the pressure of the steam by introducing the turbine power, the turbine The steam whose pressure has dropped by the above and having a pressure higher than the atmospheric pressure is extracted from the middle stage between the inlet and the outlet of the turbine, and the extracted steam is condensed .

  In this way, the energy of the high-pressure steam is first converted into power by the turbine, and by this condensing the steam whose pressure has dropped, that is, close to the saturated steam pressure, the power (kinetic energy) is converted from the steam. Both the thermal energy for heat retention of the dust collector can be efficiently recovered.

  As described above, according to the present invention, a waste treatment facility provided with a plurality of treatment systems can efficiently retain the temperature of a dust collector in a stopped treatment system while suppressing an increase in the size of the facility. Can be provided, and a method for keeping the dust collector warm.

The overall configuration of a waste disposal plant according to the implementation of the embodiment of the present invention is a flow sheet showing. It is a flow sheet which shows the composition of the 1st and 2nd air circulation device in the waste disposal facility, and the 1st and 2nd heat exchangers. The implementation of the embodiment of the present invention is a flow sheet showing the overall structure of a waste disposal plant according to another reference embodiment.

  Preferred embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows the overall configuration of a waste disposal plant according to the present onset Ming embodiment. This equipment includes a first processing system 10A, a second processing system 10B, a water circulation system 20, a low-pressure steam sump 30 that is a steam receiving unit, a first air circulation device 40A, a second air circulation device 40B, And a heat exchange unit 50.

  Each of the first and second treatment systems 10A and 10B is for treating a waste such as waste as well as treating and discharging exhaust gas generated by the combustion. The first treatment system 10A includes a first combustion furnace 12A that combusts the waste, and a first boiler 14A that generates steam by boiling water with heat of exhaust gas generated by combustion in the first combustion furnace 12A. And a first bag filter 16A, which is a first dust collector for removing dust in the exhaust gas cooled by the first boiler 14A, and a first bag filter for discharging the exhaust gas after passing through the first bag filter 16A to the outside of the system. 1 chimney 18A. Similarly, the second treatment system 10B includes a second combustion furnace 12B that combusts the waste, and a steam that is generated by boiling water with the heat of exhaust gas generated by combustion in the second combustion furnace 12B. 2 boiler 14B, 2nd bag filter 16B which is the 2nd dust collector which removes the dust in the exhaust gas cooled by this 2nd boiler 14B, and exhaust gas after passing the 2nd bag filter 16B outside the system The second chimney 18B to be discharged.

The first and second processing systems 10A and 10B are operated at the same time, and only one is operated and the other is stopped (stopped). In the latter case, it is necessary to keep the bag filter 16A or 16B belonging to the processing system whose operation is stopped in an appropriate temperature range (for example, 110 ° C. to 120 ° C.). This bag filter corresponds to the heat collecting target dust collecting apparatus according to the present invention.

  The water circulation system 20 generates power by the energy of the steam generated in the first and second boilers 14A and 14B, that is, recovers it as kinetic energy, and uses the steam as water for the first and second boilers. It is reduced to 14A and 14B. Specifically, the water circulation system 20 includes a high-pressure steam reservoir 22, a turbine 24, a condenser 26, a condensate tank 27 with a deaerator, and first and second feed water pumps 28A and 28B. . The high-pressure steam reservoir 22 receives and temporarily stores the high-pressure steam generated by the first and second boilers 14A and 14B. The turbine 24 is driven by the high-pressure steam to generate power and reduce the pressure of the high-pressure steam. The condenser 26 cools and condenses the low-pressure wet steam taken out from the outlet of the turbine 24 to the low-pressure saturated water. This saturated water is deaerated in the condensate tank 27 with a deaerator and stored, and is reduced to the first and second boilers 14A and 14B by the first and second feed water pumps 28A and 28B.

  The low-pressure steam reservoir 30 corresponds to a steam receiving portion according to the present invention, and receives and temporarily stores the low-pressure steam extracted from the turbine 24. The low-pressure steam is steam extracted from a middle stage position between the inlet and the outlet of the turbine 24, and is lower in pressure than the high-pressure steam introduced into the inlet of the turbine 24 and from the outlet of the turbine 24. The steam is higher in pressure (preferably higher than atmospheric pressure) than the wet steam to be taken out, that is, steam that is more easily condensed than the high-pressure steam. The range of the pressure of the low-pressure steam is preferably a range in which a condensation point of 100 ° C. or higher can be secured, and generally in the range of 0.1 MPa to 4 MPa (more preferably 0.2 MPa to 1.2 MPa) in terms of gauge pressure. It can be determined as appropriate.

  The first air circulation device 40A circulates air so as to pass through the inside of the first bag filter 16A. Similarly, the second air circulation device 40B passes through the inside of the second bag filter 16B. In this way, air is circulated. Specifically, each of the air circulation devices 40A and 40B includes a circulation pipe 42 as shown in FIG. 2, a fan 44, exhaust gas valves 45 and 47, and circulation valves 46 and 48.

  The circulation pipe 42 connects the pipe 15 on the inlet side of the bag filter 16A (16B) and the pipe 17 on the outlet side of the exhaust gas pipe while bypassing the bag filter 16A (16B). The fan 44 is provided in the middle of the circulation pipe 42 and forms a flow of air from the outlet side of the bag filter 16A (16B) toward the inlet side.

  The exhaust gas valve 45 is provided at a position upstream of the connection site between the inlet side pipe 15 and the circulation pipe 42 in the inlet side pipe 15 of the bag filter 16A (16B). 47 is provided at a position downstream of the connection portion between the outlet side pipe 17 and the circulation pipe 42 in the outlet side pipe 17 of the bag filter 16A (16B). The circulation valve 46 is provided in a part of the circulation pipe 42 in the vicinity of a connection part between the circulation pipe 42 and the inlet side pipe of the bag filter 16A (16B), and the circulation valve 48 is provided in the circulation pipe 42. In the piping 42 for piping, it is provided in the site | part of the vicinity of the connection site | part of the piping 42 for the said circulation and the exit side piping of bag filter 16A (16B).

The air circulation devices 40A and 40B can be switched between a bag filter use state and an air circulation state by opening and closing the valves 45 to 48. Specifically, when the exhaust gas valves 45 and 47 are opened and the circulation valves 46 and 48 are closed, a bag filter use state in which the exhaust gas can pass through the bag filter 16A (16B) is formed. The On the contrary, when the exhaust gas valves 45 and 47 are closed and the circulation valves 46 and 48 are opened, the air circulates through the inside of the bag filter 16A (16B) by the operation of the fan 44. A circulating state is formed.

  The heat exchanging part 50 is between the first circulating air circulated by the first air circulating device 40A or the second circulating air circulated by the second air circulating device 40B and the steam stored in the low pressure steam reservoir 30. By performing heat exchange, the steam is condensed and the circulating air is heated by the condensation heat. Specifically, the heat exchange unit 50 according to this embodiment includes a first steam supply pipe 51A, a second steam supply pipe 51B, a first steam heat exchanger 52A, a second steam heat exchanger 52B, The first supply switching valve 54A and the second supply switching valve 54B are included.

  The first and second steam supply pipes 51A and 51B are arranged to supply the low-pressure steam stored in the low-pressure steam reservoir 30 to the steam inlets of the first steam heat exchangers 52A and 52B, respectively. The first and second supply switching valves 54A and 54B are provided in the middle of the first and second steam supply pipes 51A and 51B, respectively, and low pressure steam is generated by opening and closing the first and second supply switching valves 54A and 54B. The supply destination is switched. Specifically, when the first supply switching valve 54A is opened and the second supply switching valve 54B is closed, a state is formed in which the steam in the low-pressure steam reservoir 30 is supplied to the first steam heat exchanger 52A. Conversely, when the second supply switching valve 54B is opened and the first supply switching valve 54A is closed, a state in which the steam in the low-pressure steam reservoir 30 is supplied to the second steam heat exchanger 52B is formed. The Furthermore, the supply switching valves 54A and 54B according to this embodiment are not only open / closed, but also can change the flow rate of the steam flowing through the steam heat exchangers 52A and 52B by changing the opening. It also functions as a control valve, that is, a flow rate control unit.

  The first steam heat exchanger 52A performs heat exchange between the first circulating air formed by the first air circulation device 40A and the low-pressure steam supplied through the first steam supply pipe 51A. Similarly, the second steam heat exchanger 52B heats between the second circulating air formed by the first air circulation device 40A and the low-pressure steam supplied through the first steam supply pipe 51A. Arranged to cause exchange. These steam heat exchangers 52A and 52B both condense at least a part of the steam by the heat exchange and heat the first or second circulating air by the condensation heat. Further, the saturated water generated by the condensation is sent to the condensate tank 27 with a deaerator in the same manner as the saturated water generated by the condenser 26.

  The specific configuration of the steam heat exchangers 52A and 52B is not particularly limited as long as the steam can be condensed by heat exchange with the circulating air. Specifically, a fin tube type heat exchanger and a bore tube type heat exchanger are suitable.

  In the present invention, depending on the arrangement of the first and second processing systems 10A and 10B, instead of the first and second steam heat exchangers 52A and 52B, a single steam heat exchanger may be used for both the air circulation devices 40A and 40B. Can be shared. In this case, the combined use of the supply switching valves 54A and 54B becomes unnecessary. Conversely, depending on the arrangement of the first and second processing systems 10A and 10B, the high-pressure steam reservoir 22 and the turbine 24 may be provided for each processing system.

  The waste treatment facility according to this embodiment further includes first and second internal thermometers 60A and 60B as means for controlling the temperature inside the first and second bag filters 16A and 16B, 1 and second steam outlet thermometers 62A and 62B.

The first and second internal thermometers 60A and 60B detect the internal temperatures of the first and second bag filters 16A and 16B, respectively, and the air circulation devices 40A (40B corresponding to the internal thermometers 60A and 60B). ) Is in an air circulation state, a command signal is sent to the supply switching valve 54A (54B) so that the detected temperature (bag filter internal temperature) approaches a preset target temperature (for example, 120 ° C.). Input to adjust the steam flow rate.

  It should be noted that the temperature sensing units of the internal thermometers 60A and 60B do not necessarily have to be disposed inside the bag filters 16A and 16B, and substantially contain information on the temperature inside the bag filters 16A and 16B. What is necessary is just to be provided in the position which can be acquired. For example, the temperature sensing unit may be provided in an inlet duct or an outlet duct of the bag filters 16A and 16B to sense the temperature of air flowing in the duct.

  The first and second steam outlet thermometers 62A and 62B detect the temperature of steam on the outlet side of the first and second steam heat exchangers 52A and 52B, respectively. In addition to the control based on the detected internal temperature, the internal thermometers 60A and 60B have a temperature range in which the temperature detected by the corresponding steam outlet thermometer 62A (62B) is set in advance (from the target temperature inside the bag filter). The supply flow control valves 54A and 54B adjust the steam flow rate so as to be within a slightly higher temperature range (for example, 130 to 150 ° C.). This control is for preventing an extreme opening / closing operation of the supply switching valves 54A and 54B, and can be omitted as appropriate.

  Next, heat insulation of the bag filter (dust collector) performed in this waste treatment facility will be described. Here, as an example, when the operation of the first processing system 10A out of the first and second processing systems 10A and 10B is stopped and only the second processing system 10B is operating, that is, the first bug filter A case where 16A is a heat retention target dust collector will be described.

  In this case, in the second processing system 10B, the fan 44 of the second circulation device 40B is stopped, the exhaust gas valves 45 and 47 are opened, and the circulation valves 46 and 48 are closed. Therefore, after the exhaust gas generated by the combustion of the waste in the second combustion furnace 12B is cooled by self-evaporating the water by exchanging heat with the water in the second boiler 14B, the second bag filter 16B. The second chimney 18B is discharged after being collected here.

  The high-pressure steam generated in the second boiler 14B is stored in the high-pressure steam reservoir 22, and then supplied to the turbine 24 to drive it, thereby generating power and reducing the pressure. A part of the steam is extracted from the middle stage of the turbine 24 and received as low-pressure steam in the low-pressure steam reservoir 30, while the remaining steam is discharged as wet steam from the outlet of the turbine 24 and condensed in the condenser 26. After that, it is returned to the second boiler 14B via the deaerator-equipped condensate tank 27 and the second feed water pump 28B.

On the other hand, for the first bag filter 16A, which is a heat collecting target dust collecting device, that is, the first dust collecting device belonging to the first processing system 10A in operation stop, the fan 44 of the first air circulation device 40A is driven, When the exhaust gas valves 45 and 47 are closed and the circulation valves 46 and 48 are opened, a circulation of air passing through the inside of the first bag filter 16A is formed. In the heat exchange unit 50, the second supply switching valve 54B is closed and the first supply switching valve 54A is opened, so that the low-pressure steam stored in the low-pressure steam reservoir 30 (that is, steam extracted from the middle stage of the turbine 24). Is supplied to the first steam heat exchanger 52A, and heat exchange is performed between the low pressure steam and the first circulating air by the first air circulation device 40A in the first steam heat exchanger 52A. The low-pressure steam is condensed and the first circulating air is heated by at least the heat of condensation. Thus, the heated circulating air flows through the inside of the first bag filter 16A, so that the heat insulation of the first bag filter 16A can be performed efficiently. Further, since the steam used for heat retention uses at least the condensation heat, that is, latent heat, the retained heat amount per unit volume is larger than that of the exhaust gas. A thing with a smaller diameter than piping can be used. Also, each of the steam heat exchangers 52A and 52B is smaller than a heat exchanger for exchanging heat between the exhaust gas and the dust collector (or circulating heat medium) to be kept warm as in the past. Things can be used. Further, when the temperature of the exhaust gas decreases due to heat exchange between the exhaust gas and the dust collector, the corrosiveness of the exhaust gas may increase. However, the steam heat exchangers 52A and 52B are discharged from water or moisture. It is steam and its corrosivity is very low compared to low temperature exhaust gas.

  Further, in this embodiment, the first bag filter internal thermometer 60A detects the temperature inside the first bag filter 16A, and the first supply switching is performed so that the detected temperature approaches a preset target temperature. By adjusting the flow rate of the low-pressure steam supplied to the first steam heat exchanger 52A by changing the opening degree of the valve 54A, the temperature inside the first bag filter 16A is controlled within an appropriate range.

  Contrary to the above, even when the first processing system 10A is in operation and the operation of the second processing system 10B is stopped, the heat retention of the second bag filter 16B which is the heat collecting target dust collector in this case is It is possible to do exactly the same way.

In the embodiment of the previous reporting, to convert the energy of steam with a steam or high pressure generated in the boiler 14A or 14B first in the power turbine 24, thereby the pressure drops, i.e. close to the saturated vapor pressure By condensing the steam, it is possible to efficiently recover both power (kinetic energy) and heat energy for keeping the dust collector warm from the steam. For example, when the pressure of high-pressure steam introduced into the inlet of the turbine 24 is 2 to 4 MPa in terms of gauge pressure, and the pressure of steam (wet steam) discharged from the outlet is a pressure near atmospheric pressure, the turbine If steam having a pressure of, for example, about 0.2 MPa is extracted from the middle stage of 24 as low-pressure steam, the energy recovery efficiency can be significantly increased as compared with the case where the high-pressure steam is condensed as it is.

However , the bag filters 16A and 16B can be kept warm by condensing the high-pressure steam generated by the boiler 14A or 14B as it is (without reducing the pressure by the turbine 24). An example thereof is shown in FIG. 3 as a reference form.

  In the apparatus shown in FIG. 3, in place of the low-pressure steam reservoir 30 shown in FIG. 1, a water circulation system 20 bypasses the turbine 24 and has a high-pressure steam reservoir 22 on the upstream side and a condenser 26 on the downstream side. The first and second bypass pipes 23A and 23B that directly communicate with each other, and the first and second bypass flow rate control valves 25A and 25B provided in the middle thereof.

  The first and second bypass pipes 23 </ b> A and 23 </ b> B are respectively connected to the condenser 26. The first and second bypass flow rate adjustment valves 25A and 25B are operated so as to adjust the flow rate of the high-pressure steam in each of the bypass pipes 23A and 23B. Specifically, the opening degree of each bypass flow rate control valve 25A, 25B is the total amount of steam supplied from the boiler 14A or 14B to the high-pressure steam reservoir 22 when the turbine 24 is stopped due to a failure or the like (the turbine 24 is turned on). During normal operation when the turbine 24 is operating normally, the condenser 26 is damaged due to the sudden introduction of steam in the emergency, or a steam hammer. In order to avoid the occurrence of the above, it is operated so that a small amount of high-pressure steam flows constantly to the condenser 26.

In this reference embodiment, the first and second steam supply pipes 51A and 51B of the heat exchange unit 50 are connected to the first and second bypass pipes 23A and 23B in place of the low-pressure steam reservoir 30 shown in FIG. ing. That is, the high-pressure steam flowing through the first and second bypass pipes 23A and 23B is piped so as to be divided into the first and second steam supply pipes 51A and 51B. Further, the outlets of the respective steam heat exchangers 51A and 51B are connected to the condenser 26 as in the first embodiment.

According to this apparatus, the high-pressure steam stored in the high-pressure steam reservoir 22 does not pass through the turbine 24, but passes through the bypass flow rate adjustment valve 25A (or 25B) and the steam supply pipe 51A (or 51B) to exchange steam heat. Is supplied to the condenser 52A (or 52B), condensed in the steam heat exchanger, and then supplied to the condenser 26. Therefore, in this reference embodiment, the high-pressure steam before Symbol accepted the high pressure steam reservoir 22 is directly subject to heat exchange. Moreover, in this reference form, there exists an advantage which can heat-retain the bag filter equivalent to a heat retention object dust collector using the excess high pressure steam which was originally escaped by the condenser 26. FIG.

  In the present invention, when the first and second air circulation devices and the heat exchange unit are provided, the heat exchange unit performs heat exchange between the circulation air and the steam formed by the first and second air circulation devices. Not limited to what For example, the heat exchanging unit exchanges heat between the circulating air heat exchanger that causes heat exchange between the circulating air and another heat medium fluid, and the heat medium fluid and the steam. And a steam heat exchanger that performs the above-described operation, that is, a plurality of stages. Moreover, although it is a form different from embodiment of this invention, the channel | path of the heat medium (for example, air) is formed around the exhaust gas piping in the processing system in operation, and the exhaust gas flowing through the exhaust gas piping and the heat medium It is also possible to heat the heat medium by heat exchange between the two, and to keep the dust collector in the processing system stopped in operation with the heat held by the heat medium.

  This invention is not restricted to what condenses the said vapor | steam by heat exchange with the circulating air and vapor | steam which pass the inside of a 1st and 2nd dust collector. For example, the first and second dust collectors include a condenser that condenses the vapor, and the dust collector that incorporates the condenser directly by the condensation heat generated by the condensation of the vapor in the condenser directly It may be warmed. Also in this case, for example, compared with the case where a part of the exhaust gas flowing through the operating processing system is flowed to the heating passage formed inside the heat collecting target dust collector in the processing system in which the operation is stopped ( Including an increase in the size of the dust collector having a built-in heat exchanging portion).

  Further, the waste treatment facility according to the present invention does not exclude those having three or more treatment systems, that is, those having third, fourth, etc. treatment systems in addition to the first and second treatment systems. In this case as well, it is possible to effectively perform the heat insulation of the dust collector belonging to the processing system that is not operating by using the condensation heat of the steam generated in the boiler belonging to the operating processing system. .

10A 1st processing system 10B 2nd processing system 12A 1st combustion furnace 12B 2nd combustion furnace 14A 1st boiler 14B 2nd boiler 16A 1st bag filter (1st dust collector)
16B Second bag filter (second dust collector)
20 Water circulation system 22 High-pressure steam reservoir (steam receiving part)
24 Turbine 30 Low pressure steam reservoir (steam receiving part)
40A 1st air circulation device 40B 2nd air circulation device 50 Heat exchange part 52A 1st steam heat exchanger 52B 2nd steam heat exchanger 54A 1st supply switching valve 54B 2nd supply switching valve 60A 1st bag filter internal thermometer (Temperature controller)
60B 2nd bag filter internal thermometer (temperature controller)

Claims (4)

A waste treatment facility,
In a first combustion furnace for burning waste, a first boiler for generating steam by boiling water with heat of exhaust gas generated by combustion in the first combustion furnace, and exhaust gas cooled by the first boiler A first processing system including a first dust collector for removing the dust of
In a second combustion furnace for burning waste, a second boiler for generating steam by boiling water with heat of exhaust gas generated by combustion in the second combustion furnace, and in exhaust gas cooled by the second boiler A second processing system including a second dust collector for removing the dust of
A steam receiving section for receiving steam generated by the first boiler and the second boiler,
The steam receiving unit condenses the steam received, and by the condensation heat, a heat retaining unit that retains the temperature of the dust collector in the stopped processing system among the first and second processing systems ,
A turbine that converts the energy of the steam into motive power while lowering the pressure of the steam generated in the first or second boiler, and the steam receiving section is a steam whose pressure is reduced by the turbine. A waste treatment facility that accepts steam with a pressure higher than atmospheric pressure . The waste treatment facility according to claim 1, wherein the steam is extracted from a middle stage between an inlet and an outlet of the turbine. In a first combustion furnace for burning waste, a first boiler for generating steam by boiling water with heat of exhaust gas generated by combustion in the first combustion furnace, and exhaust gas cooled by the first boiler A first treatment system including a first dust collecting device for removing dust, a second combustion furnace for burning waste, and steam obtained by boiling water by heat of exhaust gas generated by combustion in the second combustion furnace And a second treatment system including a second dust collecting device for removing dust in the exhaust gas cooled by the second boiler, and the first and second in a waste treatment facility. A method for keeping a dust collector belonging to a processing system of which operation is stopped among the processing systems as a heat retention target,
The steam generated in the boiler belonging to the operating processing system of the first boiler and the second boiler is condensed, and by the heat of condensation, in the processing system that is stopped among the first and second processing systems. Keeping the dust collector warm ,
Converting steam energy into motive power while lowering the pressure of the steam by introducing steam generated by the first or second boiler into the turbine, and steam whose pressure has dropped by the turbine A method of keeping warm in a dust collector of a waste treatment facility, wherein steam having a pressure higher than atmospheric pressure is extracted from a middle stage between an inlet and an outlet of the turbine and the extracted steam is condensed . The method for keeping warm in a dust collector of a waste treatment facility according to claim 3, wherein steam having a pressure of 0.1 MPa to 4 MPa is extracted from the middle stage of the turbine as a gauge pressure. How to keep the dust device warm.

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