CN111886468A - Dust collection system and heat storage system - Google Patents

Dust collection system and heat storage system Download PDF

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Publication number
CN111886468A
CN111886468A CN201980016551.8A CN201980016551A CN111886468A CN 111886468 A CN111886468 A CN 111886468A CN 201980016551 A CN201980016551 A CN 201980016551A CN 111886468 A CN111886468 A CN 111886468A
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CN
China
Prior art keywords
dust
heat storage
heat
wall member
air
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201980016551.8A
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Chinese (zh)
Inventor
木嶋敬昌
山本敬介
三坂浩司
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Nihon Spindle Manufacturing Co Ltd
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Nihon Spindle Manufacturing Co Ltd
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Publication of CN111886468A publication Critical patent/CN111886468A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/002—Details of the installations, e.g. fume conduits or seals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • F27D2017/007—Systems for reclaiming waste heat including regenerators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/14—Thermal energy storage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Abstract

The present invention addresses the problem of providing a dust collection system or a heat storage system that can appropriately heat a portion that requires heat, such as a dust collector or piping, using the heat of combustion exhaust gas from a furnace facility. In order to solve the above problem, a dust collection system or a heat storage system is provided, the dust collection system including: a heat storage device for storing heat of air containing dust from the furnace; and a dust collector, wherein the heat storage system comprises: a heat storage device for storing heat of air containing dust from the furnace; and a dust remover removing dust from the dust-laden air before the dust-laden air flows into the heat storage device. According to the dust collection system or the heat storage system, the heat of the dust-containing air discharged from the furnace can be stored in the heat storage device, and the heat can be appropriately released at a portion requiring heat, such as a dust collector or a pipe.

Description

Dust collection system and heat storage system
Technical Field
The present invention relates to a dust collecting system and a heat accumulating system used in furnace equipment such as a garbage incinerator and a steel making furnace.
Background
There is known a dust collector for removing dust and dirt from exhaust gas of an incinerator. The dust collector described in patent document 1 is a device for cleaning dust-containing air supplied from an incinerator, a crushing facility, or the like by collecting dust and dirt contained in dust-containing air flowing from a dust-containing air introduction chamber side toward a clean air chamber side in a housing with a filter unit. The device is composed as follows: the compressed air is blown from the clean air chamber side to the dust air introducing chamber side through the filter section by the compressed air blowing section to be dusted and removed of dust attached to the filter section.
Prior art documents
Patent document
Patent document 1: japanese laid-open patent publication No. 2007-175622
Disclosure of Invention
Technical problem to be solved by the invention
When municipal refuse or the like is incinerated, the combustion exhaust gas generated at this time contains harmful substances such as hydrogen chloride and sulfur oxide. To neutralize and remove these substances, an alkaline agent such as hydrated lime or sodium hydroxide is added to the combustion exhaust gas. As a result, the neutralization product produced by the neutralization is contained in the combustion exhaust gas. When the combustion exhaust gas in this state is introduced into the dust collector, the neutralized product adheres to the filter surface of the dust collector or the inner surface of the frame. And also to the flow path of the combustion exhaust gas from the furnace to the dust collector.
A portion of the neutralized product is deliquescent. Therefore, when the temperature of the dust collector is lowered, the neutralized product may be deliquesced by the water vapor contained in the combustion exhaust gas. If the neutralization product attached to the surface of the filter is deliquesced, the filter may be clogged and the performance of the dust collector may be degraded. Further, the neutralized product adhering to the flow path may promote corrosion of the piping.
Therefore, when the temperature of the dust collector or the pipe is lowered, the dust collector or the pipe needs to be heated by a heater to be maintained at a high temperature in order to suppress deliquescence of the neutralized product.
The invention aims to provide a dust collecting system or a heat storage system which can properly heat a part requiring heat, such as a dust collector or a pipe, by using the heat of combustion exhaust gas of a furnace facility.
Means for solving the technical problem
As a result of intensive studies on the above problems, the present inventors have found that heat can be appropriately released from a portion requiring heat, such as a dust collector or a pipe, by accumulating heat of dust-containing air discharged from a furnace in a heat storage device, and have completed the present invention.
That is, the present invention is the following dust collection system and heat storage system.
A dust collecting system according to the present invention for solving the above problems is characterized by comprising a dust collector and a heat storage device, the dust collector comprising: a frame body; an introduction section that introduces dust-containing air containing dust from the furnace into the inside of the housing; a filter for trapping the dust; a discharge unit configured to discharge air from inside the housing; and a wall member that partitions the inside and the outside of the housing, wherein the heat storage device stores heat of dust-containing air containing dust from the furnace.
According to this dust collection system, since the heat storage device that stores heat of the dust-containing air containing dust and dirt from the furnace is provided, the dust collector or other equipment can be heated by the stored heat as needed.
In addition, according to an embodiment of the dust collection system of the present invention, the heat storage device is a heat storage portion disposed in the vicinity of the wall member.
According to this feature, since the heat storage device serves as a heat storage portion and becomes a part of the dust collector, the heat released from the heat storage device can be efficiently supplied to the dust collector.
In one embodiment of the dust collecting system according to the present invention, the heat accumulating portion absorbs and accumulates heat flowing out of the wall member to the outside of the housing when the temperature of the wall member is equal to or higher than a predetermined temperature, and releases heat to heat the wall member when the temperature of the wall member is lower than the predetermined temperature.
According to this feature, the heat storage part releases heat when the temperature of the wall member of the dust collector is lower than the predetermined temperature, and therefore, the stored heat can be utilized when it is necessary to heat the dust collector.
In addition, as an embodiment of the dust collecting system of the present invention, the heat storage unit absorbs and stores heat flowing out from the wall member to the outside of the housing when the introduction unit introduces the dust-containing air into the housing, and releases heat to heat the wall member when the introduction unit does not introduce the dust-containing air into the housing.
According to this feature, heat is stored when the furnace facility is operated and the dust-containing air discharged from the furnace is supplied to the dust collector, and the wall member is heated when the furnace facility is stopped, so that it is possible to prevent the temperature of the dust collector from dropping when the furnace facility is stopped, and to suppress the deliquescence of the neutralized product adhering to the surface of the filter or the like.
In addition, as an embodiment of the dust collecting system of the present invention, the housing has a 1 st chamber and a 2 nd chamber, the air can move to the 2 nd chamber after passing through the filter, the introduction portion introduces dust-containing air containing dust into the 1 st chamber, the discharge portion discharges air from the 2 nd chamber, the wall member includes a 1 st wall member that partitions an inside of the 1 st chamber and an outside of the housing and is positioned below the filter in a vertical direction, and the heat storage portion includes a 1 st heat storage portion that heats the 1 st wall member.
According to this feature, since the 1 st wall member located vertically below the filter includes the heat storage portion, the filter can be efficiently heated when the heat storage portion releases heat. Further, the heat storage portion of the 1 st wall member heats the side of the filter where the dust and dirt including the neutralization product are accumulated, and thus deliquescence of the neutralization product can be effectively suppressed.
In addition, as an embodiment of the dust collecting system of the present invention, the housing has a 1 st chamber and a 2 nd chamber, the air can move to the 2 nd chamber after passing through the filter, the introduction portion introduces dust-containing air containing dust into the 1 st chamber, the discharge portion discharges air from the 2 nd chamber, the wall member includes a 2 nd wall member partitioning an inside of the 2 nd chamber and an outside of the housing, and the heat storage portion includes a 2 nd heat storage portion heating the 2 nd wall member.
According to this feature, since the 2 nd wall member of the 2 nd chamber on the discharge portion side of the filter includes the heat accumulation portion, deliquescence of fine neutralization products passing through the filter can be effectively suppressed.
In addition, according to an embodiment of the dust collecting system of the present invention, the dust collecting system further includes a heater for heating the wall member.
According to this feature, even when the amount of heat stored in the heat storage device is insufficient, heat can be supplied by the heater, and a portion requiring heat, such as a dust collector or a pipe, can be reliably heated.
In addition, in an embodiment of the dust collecting system according to the present invention, the heater is configured to heat the dust collector when a temperature of the dust collector is lower than a predetermined temperature.
According to this feature, even when the amount of heat stored in the heat storage device is insufficient, the temperature of the dust collector can be reliably maintained.
In addition, in an embodiment of the dust collecting system according to the present invention, the heater is configured to heat the dust collector when the temperature of the dust collector is lower than a predetermined temperature and the dust collector is restarted after being stopped for a time longer than a predetermined time.
According to this feature, since the heater is operated when the temperature of the dust collector is lowered to the predetermined temperature after being stopped for the predetermined time, the operation of the heater can be restricted to the minimum necessary.
In addition, according to an embodiment of the dust collection system of the present invention, the heat storage device includes a chemical heat storage material.
According to this feature, the thermal storage device stores heat using the chemical thermal storage material, and thus can release heat at a place or for a time when heating is necessary.
In addition, an embodiment of the dust collection system according to the present invention is characterized by further comprising a water supply unit configured to supply water or steam to the heat storage device.
As the chemical heat storage material, a chemical heat storage material that releases heat by supplying water or steam, such as calcium oxide (CaO) and steam, may be used. According to the above feature, since the heat storage device includes the water supply unit that supplies water or steam to the heat storage device, the chemical heat storage material can release heat as needed.
A heat storage system according to the present invention for solving the above problems includes: a heat storage device for storing heat of dust-containing air containing dust from the furnace; and a dust remover removing dust from the dust-laden air before the dust-laden air flows into the heat storage device.
If the passage of the dust-containing air is made fine, the heat exchange rate between the dust-containing air and the heat storage material can be increased. On the other hand, the dust-containing air contains a large amount of dust, and if the passage of the dust-containing air is made fine, the dust may be blocked. According to the above feature, since the dust and dirt are removed from the dust-containing air before the dust-containing air flows into the heat storage device, clogging due to the dust and dirt can be suppressed.
Further, if the dust-containing air is caused to flow into the heat storage device, there arises a problem that the heat storage device is corroded by deliquescent neutralization products and the like contained in the dust. However, according to the above feature, since the dust is removed from the dust-containing air by the dust remover before the dust-containing air flows into the heat storage device, deliquescent neutralization products and the like contained in the dust are reduced, and corrosion and the like of the heat storage device can be suppressed.
In addition, according to an embodiment of the heat storage system of the present invention, the dust remover removes dust in a state where the temperature of the dust-containing air is 500 ℃.
The dust in the dust-containing air reacts with the gas components to generate harmful substances such as dioxin, which are generated when the dust-containing air is cooled to 300-500 ℃. According to the above feature, since the dust and dirt are removed from the dust-containing air in the state of 500 ℃ or higher, even if the temperature of the air after dust removal is lowered in the heat storage device, the effect of suppressing the generation of harmful substances such as dioxin is exhibited.
In addition, an embodiment of the heat storage system according to the present invention is characterized by including a sub-flow path branching from a main flow path through which dust-containing air passes, and the heat storage device is disposed on the sub-flow path.
According to this feature, since the heat storage device is disposed in the secondary flow path, the following effects are exhibited: the furnace facility can be operated using the main flow path, and the heat storage device provided in the sub flow path can be appropriately replaced.
In one embodiment of the thermal storage system of the present invention, the thermal storage device includes a chemical thermal storage material.
According to this feature, heat can be released by a heat generation reaction as necessary, and therefore, the heat storage device can be used for storing thermal energy, or can be used as a heat source other than a furnace facility, such as a heat source for an agricultural greenhouse, a heat source for sterilization of warm water for agriculture, and a heat source for bathing in a disaster.
The heat storage device of the present invention for solving the above problems is a heat storage device having a chemical heat storage material, and is characterized by being detachably attached to the heat storage system.
According to this heat storage device, the heat of the dust-containing air discharged from the furnace is stored in the heat storage device, so that the heat can be appropriately released at a portion requiring heat, such as a dust collector or a pipe, and the heat can be released at a portion requiring a heat source by taking the heat out of the furnace facility.
The furnace facility according to the present invention for solving the above problems is characterized by being provided with the dust collection system or the heat storage system.
According to this furnace facility, the portion requiring heat, such as the dust collector or the piping, can be appropriately heated by the heat of the combustion exhaust gas of the furnace facility, and the energy for heating the dust collector or the piping by the heater can be reduced.
The dust collection system according to the present invention for solving the above-described problems is characterized by including a dust collector to which heat generated from a heat storage device of the heat storage system is supplied.
According to this dust collection system, since the heat storage device that stores heat of the dust-containing air containing dust and dirt from the furnace is provided, the dust collector or other equipment can be heated by the stored heat as needed. Further, since the dust is removed from the dust-containing air by the dust remover before the dust-containing air flows into the heat storage device, deliquescent neutralization products and the like contained in the dust can be reduced, and corrosion and the like of the heat storage device can be suppressed.
Effects of the invention
According to the present invention, it is possible to provide a furnace facility capable of appropriately heating a portion requiring heat, such as a dust collector or a pipe, by using the heat of combustion exhaust gas in the furnace facility.
Drawings
Fig. 1 is a schematic explanatory view showing a structure of a furnace facility according to embodiment 1 of the present invention.
Fig. 2 is a schematic explanatory view showing a structure of a furnace facility according to embodiment 2 of the present invention.
Fig. 3 is a schematic explanatory view showing the structure of a furnace facility according to embodiment 3 of the present invention.
Detailed Description
The furnace facility of the present invention is provided with a furnace for discharging dust-containing air and a heat storage device for storing heat of the dust-containing air. Here, the furnace facility is not particularly limited as long as it is a furnace that discharges air containing dust. Examples of the furnace for discharging the dust-containing air include incinerators such as garbage incinerators and incinerators, calciners such as kilns and rotary kilns, smelting furnaces such as steel making furnaces and blast furnaces, heating furnaces such as floor furnaces, stoves and ovens, and boilers serving as power sources for steam ships and steam locomotives. Since the steel making furnace is frequently repeatedly operated and stopped, the effect of the furnace facility of the present invention can be more effectively exhibited from the viewpoint of easily lowering the temperature of the dust collector, the piping, and the like.
Further, a dust collection system according to the present invention includes: a dust collector for removing dust from dust-laden air containing dust from the oven; and a heat storage device for storing heat of dust-containing air containing dust from the furnace.
Further, a heat storage system according to the present invention includes: a heat storage device that stores heat of dust-containing air containing dust and dirt from the furnace; and a dust remover removing dust from the dust-laden air before the dust-laden air flows into the heat storage device.
Embodiments of a furnace facility, a dust collection system, and a heat storage system according to the present invention will be described below in detail with reference to the accompanying drawings. The description of the embodiments is merely an example for explaining the furnace facility, the dust collecting system, and the heat accumulating system according to the present invention, and the embodiments are not limited thereto.
[ 1 st embodiment ]
Fig. 1 is a schematic explanatory view showing a structure of a furnace facility 200 according to embodiment 1 of the present invention. The furnace facility 200 includes a dust collector 206, a heat storage device 203, and a dust collector 202, and in the present invention, a system including the dust collector 206 and the heat storage device 203 is referred to as a "dust collection system", and a system including the heat storage device 203 and the dust collector 202 is referred to as a "heat storage system".
As shown in fig. 1, the furnace facility 200 includes a furnace 201 and a dust collector 206, and dust-containing air G discharged from the furnace 201 is introduced into the dust collector 206 through a main flow path L1, is cleaned by the dust collector 206, and is then discharged to the atmosphere. The temperature of the dust-containing air G discharged from the furnace 201 is about 1000 ℃, and the temperature thereof is reduced to 200 ℃ or lower through a water-cooling pipe, a gas cooler, or the like, and then introduced into the dust collector 206.
The main flow path L1 includes a branched sub-flow path L2, and the dust collector 202, the heat storage device 203, and the suction pump 207 are provided in the sub-flow path L2 from the upstream side to the downstream side. The end point of the sub-flow path L2 merges with the main flow path L1, and the dust-containing air G having passed through the suction pump 207 returns to the main flow path L1.
Further, a valve V1 is provided between the dust collector 202 and the heat storage device 203 on the sub-flow path L2, and a valve V2 is provided between the heat storage device 203 and the suction pump 207, whereby the flow of the dust-containing air G through the sub-flow path L2 can be controlled.
Pressure sensors P1 and P2 are provided in a region where the dust-laden air G flows from the main flow path L1 into the sub flow path L2 and a region where the dust-laden air G returns from the sub flow path L2 to the main flow path L1 in the main flow path L1, respectively, and the pressure of the pressure sensor P1 is set to be higher than the pressure of the pressure sensor P2. This allows the dust-containing air G to naturally flow from the main flow path L1 into the sub flow path L2. In addition, when the pressure of the pressure sensor P1 is higher than the pressure of the pressure sensor P2, the suction pump 207 adjusts the flow rate of the dust-laden air G in the sub-flow path L2, and this is not an essential configuration.
[ dust remover ]
The dust remover 202 is used to remove dust from the dust-laden air G. The dust collector 202 is not particularly limited as long as it is a solid-gas separation device capable of removing dust and dirt from the dust-containing air G, and examples thereof include a filter separation device such as a filter or a particle packing layer, an electric dust collector, a gravity separation device for performing separation by gravity, a centrifugal separation device for performing separation by centrifugal force such as a cyclone, and the like.
Since the dust collector 202 removes the dust from the dust-containing air G, it is possible to suppress a large amount of dust from flowing into the heat storage device 203 of the subsequent stage to cause clogging. Furthermore, the deliquescent substance is also removed, and therefore, the heat storage device 203 can be inhibited from corroding.
The dust remover 202 preferably removes dust when the temperature of the dust-containing air G is 500 deg.c or higher. The dust in the dust-containing air G reacts with the gas components to generate harmful substances such as dioxin, which are generated when the dust-containing air G is cooled to 300-500 ℃. Therefore, by removing dust and dirt from the dust-containing air at a temperature of 500 ℃ or higher, even if the temperature of the air after dust removal is lowered in the heat storage device, the effect of suppressing the generation of harmful substances such as dioxin is exhibited.
The dust remover 202 preferably removes dust when the temperature of the dust-containing air G is 800 ℃. When the temperature of the dust-containing air G is 800 ℃ or lower, the dust remover 202 does not need to have high heat resistance, and thus various dust removers can be used.
From the viewpoint of removing dust at a temperature of 500 ℃ or higher, it is preferable to use the dust remover 202 having excellent heat resistance. Examples of the dust remover having excellent heat resistance include a ceramic filter, an electric dust collector, and a cyclone separator.
[ Heat storage device ]
The thermal storage device 203 is a device having a thermal storage material, and stores heat of the dust-containing air G, which has been dedusted by the deduster 202, in the thermal storage material. The structure of the heat storage device 203 is not particularly limited as long as it is a structure in which the dust-containing air G can supply heat to the heat storage material, and examples thereof include the following: the heat exchanger includes a housing container in which a heat storage material is housed, and a heat exchange tube for passing dust-containing air G therethrough, and the heat exchange tube is arranged inside the housing container in a meandering manner. The dusty air supplies heat to the heat storage material inside the vessel via the tube walls of the heat exchange tubes as it passes through the heat exchange tubes.
Examples of the heat storage material include: a chemical heat storage material that separates into a heat storage product and a production fluid upon heating and performs a reaction opposite thereto upon release of heat; a latent heat storage material that changes phase at a predetermined temperature to absorb or release latent heat; sensible heat storage materials that absorb or release sensible heat, and the like.
Examples of the heat-accumulative product and the generating fluid constituting the chemical heat-accumulative material include calcium oxide (Ca O) and water vapor (H)2O), calcium chloride (CaCl)2) And water vapor (H)2O), calcium bromide (CaBr)2) And water vapor (H)2O), calcium iodide (CaI)2) And water vapor (H)2O), magnesium oxide (MgO) and water vapor (H)2O), magnesium chloride (MgCl)2) And water vapor (H)2O), zinc chloride (ZnCl)2) And water vapor (H)2O), strontium chloride (SrCl)2) And ammonia (NH)3) Strontium bromide (SrBr)2) And ammonia (NH)3) Calcium oxide (CaO) and carbon dioxide (CO)2) Magnesium oxide (MgO)) And carbon dioxide (CO)2) And the like. From the viewpoint of easy handling, the chemical heat storage material preferably uses water vapor as the generating fluid.
Further, since the thermal storage device is configured to exhibit an effect particularly when chemical thermal storage is performed at high temperature, it is preferable to use a thermal storage product capable of chemical thermal storage at high temperature and a generating fluid, for example, a combination of calcium oxide and steam (400 to 500 degrees) or a combination of magnesium oxide and steam (300 to 400 degrees), as the chemical thermal storage material in the present invention.
Examples of the latent heat storage material include mannitol (166.5 ℃), trans-polybutadiene (145 ℃), erythritol (119 ℃), magnesium chloride hexahydrate (117 ℃) (the transition temperature is shown in parentheses).
Further, bricks, gravel, etc. can be mentioned as the sensible heat storage material.
The thermal storage device 203 according to embodiment 1 includes a storage container in which calcium hydroxide is stored and a water recovery tank 204, and the storage container and the water recovery tank 204 are connected by a pipe. A valve V3 is provided in the pipe, and opening and closing operations can be performed.
When the dust-containing air G flows into the heat storage device 203 and the heat of the dust-containing air G is supplied to the calcium hydroxide, the calcium hydroxide is separated into calcium oxide and water vapor by an endothermic reaction. Then, the separated water vapor moves to the water recovery tank 204, and then, the valve V3 is closed, whereby calcium oxide and water vapor can be separated.
On the other hand, when heat is released, the valve V3 is opened to move water vapor to the storage container side of the thermal storage device 203. Thereby, calcium oxide reacts with water vapor to generate calcium hydroxide and generate heat.
The heat storage device 203 according to embodiment 1 includes a heat exchange tube different from the heat exchange tube through which the dust-containing air G flows, and the heat exchange tube forms a circulation flow path L3 between the heat storage device 203 and the dust collector 206. The clean air in the circulation flow path L3 is circulated by the blower 205.
The air flowing through the circulation flow path L3 is heated by the heat generated by the exothermic reaction between the calcium oxide and the steam, and the heated air can heat the dust collector 206. This maintains the temperature of the dust collector 206 at a high temperature, and suppresses deliquescence of the neutralized product. The heated air can be supplied not only to the dust collector 206 but also to a portion that needs to be heated.
In addition, in the thermal storage device 203 of embodiment 1, the housing container that houses the chemical thermal storage material is a cassette type container, which can be removed and replaced. When the furnace apparatus 200 is removed, the valves V1 and V2 are closed, and the furnace apparatus can be replaced without stopping the operation. The detached heat storage device 203 can then be transported to a location where heating is required and used.
[ dust collector ]
The dust collector 206 is a device for removing dust from the dust-containing air G containing dust from the furnace 201, and is connected to the main flow path L1. The exhaust gases from the furnace equipment are released to the atmosphere outside the equipment after dust and dirt removal in the dust collector 206.
The dust collector 206 is not particularly limited as long as it is a solid-gas separator capable of removing dust from the dust-containing air G, and examples thereof include a filter separator such as a filter or a particle packing layer, an electric dust collector, a gravity separator for separating by gravity, and a centrifugal separator for separating by centrifugal force such as a cyclone. From the viewpoint of more reliably collecting the dust, a filter separation device using a filter is generally used.
The temperature of the dust-containing air G discharged from the furnace 201 of the furnace facility 200 is 1000 ℃ or higher, and the dust collector 206 is disposed at a position where the temperature of the dust-containing air G is reduced to about 200 ℃. The manner of reducing the temperature of the dust-containing air G discharged from the furnace 201 is not particularly limited, and examples thereof include cooling by steam or the like, natural heat release, and the like, in addition to heat recovery by the heat storage device 203. By adjusting the temperature of the dust-containing air G supplied to the dust collector 206 to about 200 ℃ or lower (preferably 100 ℃ or lower), the dust collector 206 is not required to have heat resistance, and therefore a general-purpose dust collector can be used.
From the viewpoint of preventing dew condensation, the temperature of the dust collector 206 is preferably maintained at 50 ℃.
[ 2 nd embodiment ]
The furnace facility 300 according to embodiment 2 is configured to include a dust collector 202 and a heat storage device 203 in a main flow path L1 connecting the furnace 201 and the dust collector 206. The functions of the water recovery tank 204 and the valve V3 are the same as those in embodiment 1, and therefore, the description thereof is omitted.
In the furnace facility 300 according to embodiment 2, when the temperature of the dust-containing air G is lowered, the heat storage device 203 heats the dust-containing air G to maintain the temperature of the dust collector 206 at a high temperature. According to this furnace facility 300, since the dust-containing air G is directly heated by the heat storage device 203 and the dust collector 206 is heated, there is an effect that the heat exchange is small and the stored heat can be effectively used.
[ 3 rd embodiment ]
Embodiment 3 is shown in fig. 3. In embodiment 3, a dust collection system in which a heat storage device functions as a heat storage portion provided in a dust collector is shown. By providing the heat storage device as the heat storage portion in the dust collector, the heat released from the heat storage portion can be efficiently supplied to the dust collector.
Next, the detailed description will be given with reference to the drawings. In embodiment 3, a dust collector (dust collecting system) 100 shown in fig. 3 will be described. In the following description, the left-right direction in fig. 3 is the left-right direction 99 of the dust collector 100. The vertical direction in fig. 3 is a vertical direction 97 of the dust collector 100. The direction perpendicular to the paper surface in fig. 3 is the front-rear direction of the dust collector 100, the front side of the paper surface is the front, and the back side of the paper surface is the back. The vertical direction 97 is an example of a vertical direction.
The dust collector 100 includes: a frame 1, the interior of which is divided into a dust collecting chamber (1 st chamber) 2 and a cleaning chamber (2 nd chamber) 3 by a dividing wall 4; a filter mechanism F provided on the partition wall 4 and collecting dust contained in the dust-containing air G flowing from the dust collection chamber 2 side to the cleaning chamber 3 side in the housing 1; an air compressor 6; a header 13; a diaphragm valve 14; an injection pipe 11; an injection mechanism J; a heater 25; and heat storage materials 41, 42a, 42b, 43a, 43b, 45, 46. The dust collector 100 of embodiment 3 is characterized in that the dust collector 100 includes a heat storage portion. For example, the lower right heat storage portion 45 absorbs and stores heat flowing out from the lower right wall member 35 toward the outside of the housing 1 when the temperature of the lower right wall member 35 is equal to or higher than a predetermined temperature, and releases heat to heat the lower right wall member 35 when the temperature of the lower right wall member 35 is lower than the predetermined temperature.
In embodiment 3, the filter mechanism F is configured to include a plurality of bottomed tubular filters 5, and the plurality of filters 5 are supported by the partition wall 4 in a posture in which the filter opening portions 5w at the base ends of the respective filters 5 face the clean room 3 and are arranged in a matrix when viewed in the vertical direction 97. Specifically, the filter mechanism F is configured such that a plurality of filter rows Fr in which a plurality of filters 5 are linearly arranged in a line in the left-right direction 99 are arranged in a plurality of rows in a direction (front-rear direction) orthogonal to the arrangement direction of the plurality of filters 5 in the filter rows Fr.
The injection mechanism J is a mechanism for ejecting the compressed air H ejected through the injection holes 12 provided in the injection pipe 11 from the cleaning chamber 3 side to the filter mechanism F in a pulse shape to thereby scrape off the dust collected in the filter mechanism F. The plurality of injection pipes 11 are arranged in the clean room 3 such that the injection holes 12 provided in one injection pipe 11 face each of the plurality of filter openings 5w arranged in a row, and correspond to the filter openings 5w arranged in a matrix.
The injection mechanism J includes a header 13 for storing compressed air H from the air compressor 6 and a diaphragm valve 14. The injection mechanism J is configured to inject the compressed air H accumulated in the header 13 into the injection pipe 11 by switching the diaphragm valve 14 to the open state. In the injection pipe 11, the base end side is an open end 11w, and the distal end side is a closed end 11 s. The header 13 is provided with a reservoir pressure detector 15 for detecting the pressure of the compressed air H in the header 13. Alternatively, for example, a detector for detecting the pressure of the supply air may be provided between the air compressor 6 and the compressed air intermittent valve 17 instead of the accumulated pressure detector 15.
The dust collector 100 further includes a control unit 21 for controlling the operation of the dust collector 100, such as the operation of the injection mechanism J.
Hereinafter, each part of the dust collector 100 will be described in further detail.
[ frame 1]
The inside of the housing 1 is partitioned by a partition wall 4 in the vertical direction 97, a dust collecting chamber 2 for supplying dust-containing air G is formed below, and a clean chamber 3 through which clean air C purified by a filter 5 provided on the partition wall 4 flows is formed above. Dust collecting chamber 2 is an example of the 1 st chamber. The clean room 3 is an example of the 2 nd room.
In the housing 1, when viewed from the vertical direction 97, the outer shape of the portion of the dust collecting chamber 2 where the filter 5 is disposed and the portion forming the cleaning chamber 3 are substantially rectangular, and the outer shape of the lower side of the portion of the dust collecting chamber 2 where the filter 5 is disposed is funnel-shaped.
A dust-containing air introduction passage 7 for introducing dust-containing air G from an incinerator, a steelmaking furnace, or the like (not shown) into the dust collecting chamber 2 is connected to an upper portion of the funnel-shaped portion of the housing 1. In addition, the dust-containing air introduction passage 7 may be provided in the housing 1. A purified air discharge passage 8 for discharging the purified air C purified by the filter 5 from the clean room 3 is connected to an upper portion of the rectangular portion of the housing 1. Specifically, the clean air discharge duct 8 is connected to the frame 1 above the partition wall 4 and the filter 5. A suction device (not shown) is provided downstream of the clean air discharge duct 8, and the clean air C in the clean room 3 can be sucked into the external space. The dust-containing air introduction passage 7 is an example of an introduction portion. The purified air discharge passage 8 is an example of a discharge portion.
A discharge port 9 is formed at the lower end of the funnel-shaped portion of the housing 1, and a rotary valve 10 is provided at the discharge port 9, so that dust and the like in the dust collecting chamber 2 generated at the time of regeneration of the filter 5 (at the time of dusting and collecting the dust and the like in the filter 5) can be discharged.
According to the above configuration, the dust-containing air G generated in the incinerator, the steel making furnace, or the like is introduced into the dust collecting chamber 2 through the dust-containing air introducing passage 7 by the suction force of the suction device (not shown), and when passing through the filter 5, the dust is captured and collected to become the purified air C, and then discharged from the cleaning chamber 3 to the outside space connected to the downstream side of the dust collector 100 through the purified air discharging passage 8.
[ Filter 5]
The filter 5 is a bag filter formed by covering a bag-shaped (bottomed cylindrical) bag (not shown) capable of circulating dust-containing air G with the outside of a support body (not shown) formed in a bottomed basket shape (for example, a bottomed cylindrical basket shape formed by attaching a plurality of linear rod-shaped bodies to a plurality of annular frames formed in an annular shape).
The bag is made of a filter cloth capable of collecting dust in the dust-containing air G well, and is made of, for example, a cloth on the inside and a nonwoven fabric attached to the outside of the cloth.
The material of the filter cloth is made of synthetic fibers, glass fibers, or the like.
The lower part of the bag is formed into a bag shape, the opening of the upper part thereof is a filter opening 5w, and the upper end part of the bag is sandwiched and fixed between the support body and the partition wall 4.
The filter 5 may be configured by providing a bottom portion made of a non-air-permeable material other than filter cloth in a bottomless cylindrical bag (not shown), for example.
Each filter 5 is attached to the partition wall 4 in a suspended state with a filter opening 5w formed at an upper end thereof.
In embodiment 3, 14 filters 5 are arranged in a filter row Fr formed by arranging 1 line at equal intervals in a linear filter arrangement direction (left-right direction 99), and 210 filters 5 are arranged in a filter row Fr of a plurality of lines (for example, 15 lines (odd lines)) arranged at equal intervals in a direction (front-rear direction) orthogonal to the filter arrangement direction.
The number (column number) of the filters 5 constituting the filter row Fr, the number of rows of the filter rows Fr, the shape of the bag, and the like may be changed as appropriate depending on the relationship with the amount of dust and dirt to be treated, and the like.
[ injection mechanism J ]
The injection pipe 11 is configured as follows: the filter unit is disposed in a horizontal posture in which an end portion on the open end 11w side protrudes outward from the side wall of the frame body 1 and the remaining portion extends along the arrangement direction of the 14 filter openings 5w, and is disposed in correspondence with each of the 15 filter rows Fr in a state of facing the 14 filter openings 5w arranged in 1 row and being positioned in the clean room 3.
In addition, the injection hole 12 is formed by a circular punched hole formed in the injection pipe 11. Further, 14 injection holes 12 are provided at equal intervals in each injection pipe 11 so as to correspond one-to-one to the filter openings 5w of the filter 5.
Further, each injection hole 12 is provided in the injection pipe 11 such that the center thereof is positioned substantially at the center of each filter opening 5w when viewed in the direction along the axial center of each filter 5.
An annular rising portion that protrudes outward in the radial direction of the injection pipe 11 is formed at the opening edge of each injection hole 12 by burring. Since the diffusion of the compressed air H injected from the injection holes 12 is suppressed by the annular rising portion of the opening edge portion of the injection holes 12, the compressed air H is sufficiently suppressed from leaking to the outside when the compressed air H is injected from the injection holes 12 toward the filter opening portions 5w of the filters 5. The opening edge of the injection hole 12 is not necessarily subjected to burring.
The diaphragm valve 14 includes a pressure chamber for applying back pressure to the diaphragm and an electromagnetic valve for opening and closing an exhaust passage for exhausting the pressure chamber. In a state where the solenoid valve is closed, the diaphragm valve 14 is closed by the pressure of the pressure chamber being applied to the diaphragm by the primary pressure (pressure in the header 13) introduced into the pressure chamber through the communication hole, and the valve body attached to the diaphragm being pressed against the valve seat. On the other hand, in a state where the solenoid valve is open, the pressure in the pressure chamber is released and reduced, the diaphragm is pressed by the primary pressure (the pressure in the header 13), the valve body attached to the diaphragm is separated from the valve seat, and the diaphragm valve 14 is opened. That is, the diaphragm valve 14 is switched between an open state and a closed state by the opening and closing operation of the solenoid valve.
The air compressor 6 and the header 13 are connected together by a compressed air supply passage 16, and compressed air H discharged from the air compressor 6 is supplied to the header 13.
A compressed air intermittent valve 17 that supplies or shuts off the supply of the compressed air H to the header 13 is provided in the compressed air supply passage 16.
The control unit 21 is configured as follows: when a predetermined regeneration timing at which the regeneration of the filter 5 is required is reached, the compressed air intermittent valve 17 is opened, and when the pressure of the compressed air H in the header pipe 13 detected by the accumulated pressure detector 15 reaches a predetermined target accumulated pressure, the compressed air intermittent valve 17 is closed. It is not necessary to close the compressed air intermittent valve 17 in accordance with the detected pressure of the compressed air H. For example, the time when the pressure of the compressed air H reaches the target accumulated pressure may be estimated in advance, and the timing of closing the compressed air intermittent valve 17 may be determined in accordance with the estimated time.
That is, the compressed air H from the air compressor 6 is accumulated in the header 13 at the target accumulation pressure.
The control unit 21 is configured as follows: when the compressed air intermittent valve 17 is closed as the pressure in the header pipe 13 detected by the reservoir pressure detector 15 reaches a predetermined target reservoir pressure, a predetermined 1 diaphragm valve 14 of the 7 diaphragm valves 14 is opened for a predetermined set regeneration time. The regeneration time is set to be slightly shorter than the time required to inject the substantially total amount of the compressed air H accumulated in the header 13 from the injection holes 12 of the injection pipes 11.
That is, when the diaphragm valve 14 is opened, the compressed air intermittent valve 17 is closed, and therefore, in a state where the supply of the compressed air H from the air compressor 6 to the header 13 is cut off, the high-pressure compressed air H accumulated in the header 13 passes through the two (or one) injection pipes 11 and is then injected in a pulse form from the 14 injection holes 12 provided in the injection pipes 11. Thereby, the dirt trapped in the filter 5 is scraped off.
In addition, although the above control of the injection mechanism J has been described as an example in which the opening and closing of the compressed air intermittent valve 16 or the diaphragm valve 14 are controlled based on the accumulated pressure detected by the accumulated pressure detector 15, in the case where a detector that detects the pressure of the supplied air is provided, the opening and closing of the compressed air intermittent valve 16 or the diaphragm valve 14 may be controlled based on the supplied air.
[ wall Member ]
As shown in fig. 3, the housing 1 includes an upper wall member 31, a right wall member 32, a left wall member 33, a rear wall member 34, a front wall member (not shown), a lower right wall member 35, and a lower left wall member 36. The inside and the outside of the housing 1 are partitioned by these wall members. For example, stainless steel plate-like members, rolled steel plate-like members of ordinary structure, and sulfuric acid dew point corrosion resistant steel plates can be used as the wall members.
Hereinafter, for convenience of explanation, an upper portion of the partition wall 4 of the right wall member 32 may be referred to as a right upper wall member 32a, and a lower portion of the partition wall 4 of the right wall member 32 may be referred to as a right lower wall member 32 b.
An upper portion of the partition wall 4 of the left wall member 33 may be referred to as an upper left wall member 33a, and a lower portion of the partition wall 4 of the left wall member 33 may be referred to as a lower left wall member 33 b.
An upper portion of the partition wall 4 of the rear wall member 34 may be referred to as a rear upper wall member 34a, and a lower portion of the partition wall 4 of the rear wall member 34 may be referred to as a rear lower wall member 34 b.
An upper portion of the partition wall 4 of the front wall member may be referred to as a front upper wall member, and a lower portion of the partition wall 4 of the front wall member may be referred to as a front lower wall member.
The right upper wall member 32a and the right lower wall member 32b, the left upper wall member 33a and the left lower wall member 33b, the rear upper wall member 34a and the rear lower wall member 34b, and the front upper wall member and the front lower wall member may be integrated members as in embodiment 3, or may be separate members independent of each other.
The cleaning chamber 3 of the housing 1 is partitioned from the outside of the housing 1 by the upper wall member 31, the right upper wall member 32a, the left upper wall member 33a, the rear upper wall member 34a, and the front upper wall member. The upper wall member 31, the right upper wall member 32a, the left upper wall member 33a, the rear upper wall member 34a, and the front upper wall member are examples of the wall member and the 2 nd wall member.
The dust collecting chamber 2 of the housing 1 is defined from the outside of the housing 1 by a right lower wall member 32b, a left lower wall member 33b, a rear lower wall member 34b, a front lower wall member, a lower right wall member 35, and a lower left wall member 36. The right lower wall member 32b, the left lower wall member 33b, the rear lower wall member 34b, the front lower wall member, the lower right wall member 35, and the lower left wall member 36 are examples of wall members.
As shown in fig. 3, the lower right wall member 35 and the lower left wall member 36 are located below the filter 5. The lower right wall member 35 and the lower left wall member 36 constitute the funnel shape. The lower right wall member 35 and the lower left wall member 36 are examples of the wall member and the 1 st wall member.
[ Heater 25]
As shown in fig. 3, the heater 25 is disposed in contact with the outer surfaces of the lower right wall member 35 and the lower left wall member 36. The heater 25 generates heat by energization, and heats the lower right wall member 35, the lower left wall member 36, the lower right heat storage portion 45, and a lower left heat storage portion 46 (described later) that are in contact with each other. The energization or non-energization of the heater 25 is controlled by the control unit 21.
Specifically, the control unit 21 detects the temperature by the temperature sensor 23 provided in the lower right wall member 35 of the housing 1, and turns OFF the heater 25 when the detected temperature is higher than a predetermined threshold temperature, and turns ON the heater when the detected temperature is lower than the predetermined threshold temperature. The inside of the housing 1 of the dust collector can be maintained at a high temperature to some extent by energization of the heater 25 and heat release from a heat storage unit described later.
[ Heat-accumulative materials ]
In embodiment 3, a plurality of heat storage portions (the upper heat storage portion 41, the upper right heat storage portion 42a, and the like) are disposed in contact with the outer surfaces of the wall members 31 to 36 of the housing 1. In embodiment 3, the heat storage unit is configured to include a latent heat storage material. For example, the heat storage portion is configured by filling a latent heat storage material into the hollow container. The latent heat storage material is a material that undergoes a phase change at a predetermined phase change temperature to absorb or release latent heat. As the heat storage material of embodiment 3, for example, mannitol (166.5 ℃), trans polybutadiene (145 ℃), erythritol (119 ℃), magnesium chloride hexahydrate (117 ℃) and the like (the phase transition temperature is shown in parentheses) can be used. By providing the heat storage portion in contact with the outer surface of the wall member, when the temperature of the wall member is equal to or higher than the phase transition temperature, the latent heat storage material of the heat storage portion absorbs and stores heat flowing out from the wall member toward the outside of the housing 1 by the phase transition. When the temperature of the wall member is lower than the phase transition temperature, the latent heat storage material of the heat storage portion releases heat by the phase transition to heat the wall member.
Here, an example in which the dust collector 100 is used in the combustion exhaust gas treatment of a garbage incinerator will be considered. Erythritol (phase transition temperature 119 ℃) was used as a latent heat storage material of the heat storage portion. The temperature of the combustion waste gas is about 160-200 ℃. When the combustion exhaust gas is introduced into the housing 1 from the dust-containing air introduction duct 7, the wall members become at a temperature equal to or higher than the phase transition temperature (119 ℃), and therefore the latent heat storage material of the heat storage portion absorbs heat from the wall members by the phase transition and stores the heat as latent heat. When the introduction of the combustion exhaust gas from the dust-laden air introduction passage 7 is stopped, the temperature of the wall member and the heat storage portion gradually decreases. When the temperatures of the wall member and the heat storage portion become lower than the phase transition temperature (119 ℃) of the latent heat storage material, the latent heat storage material in the heat storage portion changes phase to release latent heat, and thus the wall member is heated. This suppresses a temperature drop in the wall members of the dust collector 100.
In particular, it is preferable to use a material having a phase transition temperature higher than the deliquescence temperature of the neutralization product in the combustion exhaust gas as the latent heat storage material of the heat storage portion, because the temperature of the wall member can be suppressed from decreasing to the deliquescence temperature of the neutralization product. Further, it is preferable to use a material having a phase transition temperature lower than the temperature of the gas introduced into the dust collector 100 as the latent heat storage material of the heat storage unit, because heat is stored when the gas is introduced into the housing 1, and heat is released when the introduction of the gas is stopped, and therefore, a decrease in the temperature of the wall member when the gas is not introduced into the housing 1 can be suppressed.
In embodiment 3, as shown in fig. 3, the upper heat storage portion 41 is disposed in contact with the outer surface of the upper wall member 31. The right upper heat storage portion 42a is disposed in contact with the outer surface of the right upper wall member 32 a. The left upper heat storage portion 43a is disposed in contact with the outer surface of the left upper wall member 33 a. The rear upper heat storage portion (not shown) is disposed in contact with the outer surface of the rear upper wall member 34 a. The front upper heat storage portion (not shown) is disposed in contact with an outer surface of the front upper wall member. These heat accumulating portions suppress a decrease in temperature of the wall members partitioning the interior of the clean room 3 and the exterior of the housing 1. The upper heat storage portion 41, the upper right heat storage portion 42a, the upper left heat storage portion 43a, the upper rear heat storage portion, and the upper front heat storage portion are examples of the heat storage portion and the 2 nd heat storage portion.
In embodiment 3, as shown in fig. 3, the right lower heat reservoir portion 42b is disposed in contact with the outer surface of the right lower wall member 32 b. The left lower thermal storage portion 43b is disposed in contact with the outer surface of the left lower wall member 33 b. The rear lower heat accumulating portion (not shown) is disposed in contact with the outer surface of the rear lower wall member 34 b. The front lower heat accumulating portion (not shown) is disposed in contact with the outer surface of the front lower wall member. The lower right heat storage portion 45 is disposed in contact with the outer surface of the lower right wall member 35. The lower left heat accumulating portion 46 is arranged in contact with the outer surface of the lower left wall member 36. These heat accumulating portions suppress a decrease in temperature of the wall member that partitions the inside of dust collecting chamber 2 and the outside of housing 1. The right lower heat storage portion 42b, the left lower heat storage portion 43b, the rear lower heat storage portion, the front lower heat storage portion, the lower right heat storage portion 45, and the lower left heat storage portion 46 are examples of the heat storage portion.
In particular, it is advantageous to dispose the lower right heat accumulating portion 45 and the lower left heat accumulating portion 46 in contact with the outer surfaces of the lower right wall member 35 and the lower left wall member 36. Dirt that is dusted off from the filter 5 will come into contact with the lower right wall part 35 and the lower left wall part 36 located below the filter 5. If the temperature of the lower right wall member 35 and the lower left wall member 36 decreases, the deliquescence of the neutralization product may cause accumulation of dust and dirt scraped off from the filter 5. The accumulation of dust and dirt can be suppressed by the lower right heat storage portion 45 and the lower left heat storage portion 46. Further, if the temperature of the lower right wall member 35 and the lower left wall member 36 is kept high by suppressing the temperature drop thereof by the lower right heat storage portion 45 and the lower left heat storage portion 46, the temperature of the filter 5 located above the lower right wall member 35 and the lower left wall member 36 is also kept high by convection, which is preferable. The lower right heat storage portion 45 and the lower left heat storage portion 46 are examples of the 1 st heat storage portion.
In embodiment 3, as shown in fig. 3, the heater 25 is disposed in contact with the outer surfaces of the lower right wall member 35 and the lower left wall member 36. The heater 25 is preferably configured to heat the lower right wall member 35, the lower left wall member 36, the lower right heat storage portion 45, and the lower left heat storage portion 46, because the heater can exhibit the same effect as that of the lower right heat storage portion 45 and the lower left heat storage portion 46, and can store heat in the lower right heat storage portion 45 and the lower left heat storage portion 46.
[ modified examples ]
In embodiment 3, an example in which the heat storage unit includes a latent heat storage material is described. However, a sensible heat storage material may be used instead of the latent heat storage material, or a latent heat storage material and a sensible heat storage material may be used together. For example, the heat storage unit is configured by filling a sensible heat storage material into the hollow container. For example, the sensible heat storage material may be disposed in contact with the outer surfaces of the wall members 31 to 36. The sensible heat storage material is a heat storage material that stores heat by utilizing the heat capacity of the heat storage material. As the heat storage material of this modification, for example, bricks, gravel, or the like can be used.
Consider an example in which bagger 100 is used in the treatment of combustion exhaust gas of a garbage incinerator. Bricks are used as the sensible heat storage material of the heat storage portion. The temperature of the combustion waste gas is about 160-200 ℃. When the combustion exhaust gas is introduced into the housing 1 from the dust-containing air introduction passage 7, the temperature of the wall member is also about 160 to 200 ℃. The heat storage portion in contact with the wall member receives heat from the wall member and has the same temperature as the wall member. If the introduction of the combustion exhaust gas from the dust-laden air introduction passage 7 is stopped, the temperature of the wall member gradually decreases. At this time, the heat storage portion releases heat and applies heat to the wall member, thereby suppressing a temperature drop of the wall member. This suppresses a temperature drop in the wall members of the dust collector 100.
Further, as the heat storage portion, a chemical heat storage material may be used. As an example of the chemical heat storage material, calcium oxide or magnesium oxide is available. Hereinafter, the case of using calcium oxide will be described. Calcium oxide has a property of generating calcium hydroxide by causing an exothermic reaction by absorbing water. Therefore, by using the heat storage material containing calcium oxide as the heat storage portion of embodiment 3, it is possible to introduce water or water vapor into the heat storage portion to release heat when releasing heat such as when operating the dust collector. Further, calcium hydroxide has a property of decomposing at a high temperature to return to calcium oxide. Therefore, when the dust collector is operated to achieve a high temperature environment to some extent, the calcium hydroxide is returned to the calcium oxide again by an endothermic reaction. Therefore, if water or water vapor is introduced, heat can be released again. In this way, by using the chemical heat storage material and introducing water or steam when releasing heat, it is possible to suppress a decrease in performance due to a decrease in temperature of the dust collector. In the case where the chemical heat storage material is used as the heat storage portion in this manner, the dust collector 1 is provided with a water supply portion into which water or steam can be introduced into the heat storage portion, and the operation of the water supply portion is controlled by the control portion 21.
In embodiment 3, an example in which the heat storage portions 41 to 46 are disposed in contact with the outer surfaces of the wall members 31 to 36 of the housing 1 is described. However, another member or the like may be provided between the heat accumulating portions 41 to 46 and the wall members 31 to 36. For example, a waterproof sheet or the like may be disposed between the heat storage units 41 to 46 and the wall members 31 to 36. In this way, even if a structure is adopted in which other members are present therebetween, heat exchange can be performed between the heat storage portion and the wall member. For example, the heat accumulating portion and the wall member may be thermally connected by a heat pipe or the like.
In embodiment 3, an example in which the heat storage units 41 to 46 cover the entire housing 1 is described. However, the heat storage portion may cover only a part of the housing 1. Further, a structure may be adopted in which a heat storage portion is provided only in the vicinity of a part of the wall members of the casing without covering the casing 1 or a part of the casing 1, and only the part is heated.
For example, it is preferable that the heat accumulation portion be provided in the vicinity of the lower right wall member 35 or the lower left wall member 36. Since the lower right wall member 35 and the lower left wall member 36 positioned at the lower portion of the filter 5 are portions to which the neutralized product is easily attached, if heat accumulating portions are provided at these portions, deliquescence of the attached neutralized product can be suppressed satisfactorily.
For example, the heat storage portion is preferably provided near the upper wall member 31, the right upper wall member 32a, or the left upper wall member 33 a. Since the cleaning chamber 3 is away from the dust-containing air introduction passage 7 into which the high-temperature dust-containing air G is introduced, the temperature is liable to drop compared with the dust collecting chamber 2. Therefore, by providing the heat accumulation portion on the member facing the cleaning chamber 3, a temperature drop in the cleaning chamber 3 can be suppressed.
Further, for example, it is preferable to provide a heat accumulation portion in the vicinity of the purified air discharge passage 8 or the discharge port 9. These regions serve as openings, and thus it is structurally difficult to provide the heater 25. By providing the heat storage portions in these regions instead of the heater 25, it is possible to suppress a temperature drop without the heater 25. Further, it is also difficult to provide the heater 25 in the vicinity of the dust-containing air introduction duct 7, and therefore it is preferable to provide the heat storage portion, but since the high-temperature dust-containing air G is introduced in the vicinity of the dust-containing air introduction duct 7, the possibility of temperature drop is low even if the heat storage portion is not provided. Therefore, the heat accumulating portion does not necessarily need to be provided.
Also, different heat storage materials may be used depending on the region. For example, when the dust collector 100 is operated, the dust collecting chamber 2 is at a high temperature (for example, about 400 ℃), but the cleaning chamber 3 is at a lower temperature (for example, about 200 ℃) than the dust collecting chamber 2 because it is away from the dust-containing air introduction passage 7. Therefore, the heat storage material having a high phase change temperature can be provided in the vicinity of dust collecting chamber 2 (right lower wall member 32b, left lower wall member 33b, lower right wall member 35, lower left wall member 36, etc.), and the heat storage material having a low phase change temperature can be provided in the vicinity of cleaning chamber 3 (upper wall member 31, right upper wall member 32a, left upper wall member 33a, etc.). According to the above configuration, by providing an appropriate heat storage material in each of dust collecting chamber 2 and cleaning chamber 3, heat can be efficiently stored, and the range of selection of the heat storage material is increased, so that the cost can be reduced.
In addition to the heat storage unit, a heat insulating material may be used in combination.
In embodiment 3, an example in which the switch of the heater 25 is switched according to the temperature detected by the temperature sensor 23 is described, but other embodiments may be adopted. When sufficient heat is accumulated in the heat storage portion, the temperature of the dust collector 100 may return to a desired temperature by heat release from the heat storage portion even if the temperature temporarily becomes low. This phenomenon is highly likely to occur, for example, when the dust collector 100 is stopped and then immediately restarted. In view of this, for example, a time sensor (timer) may be provided, and even if the detected temperature of the temperature sensor 23 is lower than the threshold temperature, the heater 25 may be turned off when the detected time of the time sensor is shorter than a preset threshold time. In other words, the heater may be turned on only when the detected temperature of the temperature sensor 23 is lower than the threshold temperature and the detected time of the time sensor is longer than the preset threshold time. For example, when the temperature detected by the temperature sensor 23 is lower than the threshold temperature and the operation of the dust collector is started after the dust collector is stopped for a time longer than a predetermined time, the control unit 21 operates the heater 25. The dust collector stop means stopping the introduction of air from the dust-containing air introduction passage 7, and the dust collector operation means introducing air from the dust-containing air introduction passage 7.
Industrial applicability
The furnace facility of the present invention can be used for a facility including a furnace for discharging dust-containing air. Examples of the furnace for discharging the dust-containing air include an incinerator such as a garbage incinerator or a cremator, a calciner such as a kiln or a rotary kiln, a smelting furnace such as a steel making furnace or a melting furnace, a heating furnace such as a floor furnace or a stove or an oven, and a boiler serving as a power source of a steam boat or a steam locomotive.
The heat storage device of the present invention can be used to store heat of dust-laden air discharged from a furnace. The heat storage device may be used for storing heat energy, or may be used as a heat source other than furnace facilities, such as a heat source for an agricultural greenhouse, a heat source for sterilization of warm water for agricultural use, and a heat source for bathing in a disaster.
The thermal storage system of the present invention may be used to store heat from dust laden air exhausted from a furnace. Also, the heat storage system can be used to suppress corrosion and the like of the heat storage device.
Description of the symbols
200. 300-furnace equipment, 201-furnace, 202-dust remover, 203-heat storage device, 204-water recovery tank, 205-blower, 206-dust collector, 207-suction pump, L1-main flow path, L2-auxiliary flow path, L3-circulation flow path, V1, V2, V3-valve, P1, P2-pressure sensor, 1-frame, 2-dust collection chamber, 3-clean chamber, 4-partition wall, 5-filter, 7-dust-containing air introduction path, 8-purified air discharge path, 21-control section, 23-temperature sensor, 25-heater, 31-upper wall member, 32-right wall member, 32 a-right upper wall member, 32 b-right lower wall member, 33-left wall member, 33 a-left upper wall member, 33 b-left lower wall member, 34-rear wall member, 34 a-rear upper wall member, 34 b-rear lower wall member, 35-lower right wall member, 36-lower left wall member, 41-upper heat storage portion, 42 a-right upper heat storage portion, 42 b-right lower heat storage portion, 43 a-left upper heat storage portion, 43 b-left lower heat storage portion, 45-lower right heat storage portion, 46-lower left heat storage portion, C-purified air, G-dust-containing air.

Claims (13)

1. A dust collecting system is characterized in that,
comprises a dust collector and a heat storage device,
the dust collector comprises:
a frame body;
an introduction section that introduces dust-containing air containing dust from the furnace into the inside of the housing;
a filter for trapping the dust;
a discharge unit configured to discharge air from inside the housing; and
a wall member that partitions the inside and the outside of the housing,
the heat storage device accumulates heat from dust-laden air containing dust and dirt from the furnace.
2. A dust collecting system is characterized in that,
the heat storage device is a heat storage portion disposed in the vicinity of the wall member.
3. The dust collection system of claim 2,
the heat accumulation portion absorbs and accumulates heat flowing out of the wall member to the outside of the housing when the temperature of the wall member is equal to or higher than a predetermined temperature, and releases heat to heat the wall member when the temperature of the wall member is lower than the predetermined temperature.
4. The dust collection system of claim 2,
the heat storage unit absorbs and stores heat that flows out from the wall member to the outside of the housing when the introduction unit introduces dust-containing air into the housing, and releases heat to heat the wall member when the introduction unit does not introduce dust-containing air into the housing.
5. A dust collecting system according to claim 2 or 3,
the frame body has a 1 st chamber and a 2 nd chamber, air can move to the 2 nd chamber after passing through the filter, the introduction portion introduces dust-containing air containing dust into the 1 st chamber, the discharge portion discharges air from the 2 nd chamber, the wall member includes a 1 st wall member that partitions an inside of the 1 st chamber and an outside of the frame body and is positioned below the filter in a vertical direction, and the heat storage portion includes a 1 st heat storage portion that heats the 1 st wall member.
6. A dust collecting system according to any one of claims 2 to 5,
the housing has a 1 st chamber and a 2 nd chamber, air can move to the 2 nd chamber after passing through the filter, the introduction portion introduces dust-containing air containing dust into the 1 st chamber, the discharge portion discharges air from the 2 nd chamber, the wall member includes a 2 nd wall member that partitions an inside of the 2 nd chamber and an outside of the housing, and the heat storage portion includes a 2 nd heat storage portion that heats the 2 nd wall member.
7. The dust collecting system according to any one of claims 1 to 6,
the heat storage device is provided with a chemical heat storage material.
8. A heat storage system is characterized by comprising:
a heat storage device for storing heat of dust-containing air containing dust from the furnace; and
a dust remover for removing dust from the dust-laden air before the dust-laden air flows into the heat storage device.
9. The thermal storage system according to claim 8,
the dust remover removes dust and dirt under the condition that the temperature of dust-containing air is more than 500 ℃.
10. The thermal storage system according to claim 8 or 9,
the heat storage device is provided with a secondary flow path branched from a main flow path through which dust-containing air passes, and the heat storage device is disposed on the secondary flow path.
11. The thermal storage system according to any one of claims 8 to 10,
the thermal storage device has a chemical thermal storage material.
12. A thermal storage device, characterized in that,
a thermal storage system according to claim 11 which is attachable to and detachable from the thermal storage system.
13. A dust collecting system is characterized in that,
a dust collector to which heat generated from the heat storage device of the heat storage system according to any one of claims 8 to 11 is supplied.
CN201980016551.8A 2018-03-29 2019-03-29 Dust collection system and heat storage system Pending CN111886468A (en)

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