Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
  • F22B37/00—Component parts or details of steam boilers
  • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
  • F22B37/025—Devices and methods for diminishing corrosion, e.g. by preventing cooling beneath the dew point
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
  • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
  • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F22—STEAM GENERATION
  • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
  • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
  • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
  • F22D1/14—Safety or venting devices
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2303/00—Specific treatment goals
  • C02F2303/08—Corrosion inhibition

Definitions

• the present invention relates to a boiler device capable of suppressing corrosion generated in a boiler or an economizer heat transfer tube due to the influence of moisture.
• Boilers represented by water tube boilers and round boilers are used as heat sources in various industries and supply steam to steam-using equipment such as heating equipment, drying equipment, and production equipment.
• This boiler is equipped with heat transfer tubes such as water tubes and smoke tubes to heat the feed water and generate steam. Since this heat transfer tube is made of non-passivated metal such as carbon steel, the parts that come into contact with the boiler water are damaged due to the corrosion caused by the boiler water, which is fatal to the life of the steam boiler. May have a negative effect. For this reason, in order to stably operate the boiler for a long period of time, it is necessary to effectively suppress the corrosion of the heat transfer tubes.
• Non-Patent Document 1 a configuration in which an economizer (feed water preheater) is installed in a flue is used.
• the boiler with this configuration has an economic advantage that the amount of fuel used can be reduced because the economizer recovers the latent heat of the exhaust gas and uses it for preheating the feed water.
• the economizer is equipped with a heat transfer tube for heat exchange between the feed water and the exhaust gas, but this heat transfer tube is made of a non-passivated metal such as carbon steel, so it comes into contact with the feed water.
• the part may be damaged due to corrosion due to the influence of water supply, and the life of the economizer may be fatally affected. For this reason, in order to use the economizer stably for a long period of time, it is necessary to effectively suppress the corrosion of the heat transfer tube.
• Non-Patent Document 1 “Small-sized once-through boiler” issued by Japan Small-Through once-through Boiler Association, page 28
• the corrosion of the heat transfer tube is likely to occur at a portion where the water supply is continuously in contact with the boiler water.
• the connecting portion between the heat transfer tube and the lower header tends to corrode.
• Corrosion of the heat transfer tube generally has a tendency to corrode when the water contains many corrosion promoting components such as sulfate ions, salt ions, or dissolved oxygen, and there are few corrosion inhibiting components such as silica. Becomes higher.
• this corrosion may cause local corrosion or immediately cause micro-perforation and breakage.
• the local corrosion is a trough-like corrosion from the contact surface side of the heat transfer tube and water to the opposite side in the thickness direction, that is, pitting corrosion that occurs in the thickness direction of the heat transfer tube, The heat transfer tube is damaged in a short period of time.
• the boiler is operated so as to maintain the pH of the boiler in the range of 11 to 12 for the purpose of suppressing corrosion of the heat transfer tube formed of non-passivated metal.
• Supply water using tap water or groundwater as a water source usually contains an alkali component (bicarbonate or carbonate), and this alkali component is thermally decomposed in the boiler to generate a hydroxide.
• This hydroxide is concentrated as steam is generated, and the pH of boiler water rises.
• a blow operation for example, blow from the bottom of the lower header (can bottom blow) or a downcomer of the steam separator connected to the lower header is adjusted so that the pH of the boiler water is in the above range.
• the concentration ratio is controlled by blow (separator blow).
• the temperature of the feed water that rises due to heat exchange with the exhaust gas is at most about 120 ° C, and the alkali components in the feed water are hardly thermally decomposed and do not concentrate.
• the pH of the feed water does not rise in the heat transfer tube, corrosion is more likely to be accelerated than in the boiler.
• the heat transfer tube is in a caloric pressure state, the boiling of feed water does not occur and the concentration of dissolved oxygen does not decrease. , Easy to promote corrosion.
• the problem to be solved by the present invention is to suppress corrosion generated in the heat transfer tube of a boiler or an economizer due to the influence of moisture.
• the present invention has been made to solve the above-mentioned problems, and the invention according to claim 1 includes a boiler water collecting means for collecting boiler water in a boiler, and the boiler water collected in the boiler. And boiler water adding means for adding to the feed water before supply to the water.
• the boiler water collecting means collects boiler water enriched with silica, which is an alkaline and corrosion-inhibiting component, from the boiler during combustion. Then, the collected boiler water is added to the feed water before being supplied to the boiler by the boiler water addition means, and the feed water is adjusted to a water quality capable of suppressing corrosion occurring in the heat transfer pipe of the boiler. .
• the invention described in claim 2 is an economizer that preheats water supplied to the boiler with exhaust gas from the boiler, boiler water collecting means for collecting boiler water in the boiler, and the collected boiler water in the boiler Boiler water addition means to be added to the feed water before being supplied to the economizer.
• the boiler water collecting means collects boiler water enriched with silica, which is an alkaline and corrosion-inhibiting component, from the boiler during combustion. Then, the collected boiler water is added to the feed water before being supplied to the economizer by the boiler water adding means, and the feed water is generated in the heat transfer pipe of the boiler and the heat transfer pipe of the economizer. The water quality is adjusted to suppress corrosion.
• the invention described in claim 3 is characterized in that, in claim 1 or 2, the collected boiler water is added to a water supply tank that stores water supplied to the boiler.
• heated boiler water is mixed with the feed water stored in the feed water tank.
• the dissolved oxygen concentration is reduced, and the water quality is adjusted so as to suppress corrosion that occurs in the heat transfer tubes of the boiler and the economizer. It is adjusted.
• the present invention it is possible to suppress corrosion that occurs in the heat transfer tube of a boiler or an economizer due to the influence of moisture. As a result, the boiler is prevented from being damaged, and steam can be supplied stably for a long period of time.
• the present invention is preferably implemented in a boiler apparatus that generates steam by supplying water to a boiler and heating the boiler water.
• the boiler apparatus according to the first embodiment mainly includes a boiler, boiler water collecting means, and boiler water adding means.
• the boiler generates steam by heating feed water, and has various structures such as a multi-tube water tube boiler, a single tube water tube boiler, and a round boiler.
• a multi-tube water tube boiler is preferably used because it is small in size, requires less installation space, is excellent in boiler efficiency, and is easy to manage and handle.
• the boiler body part is connected to a water supply tank by a water supply path.
• water treatment equipment for performing predetermined water treatment according to the quality of raw water such as tap water, industrial water, and groundwater, such as soft water equipment, ion exchange equipment, reverse osmosis membrane A device, a nanofiltration membrane device, a deoxygenation device, a water treatment chemical injection device, etc. are connected. That is, the water supply tank is configured to store water supplied by the water treatment device, and to store the water supply in the boiler can through the water supply path.
• the upper part of the boiler can body is connected to a steam separator through a steam supply path, and the lower part of the steam separator is connected to the lower part of the boiler can body and a downcomer to collect the separated water. It is connected.
• the boiler water collecting means includes a boiler water collecting path and a boiler water collecting valve in the first embodiment.
• the boiler water collection path is concentrated from the boiler can.
• the boiler water collection valve is provided in this boiler water collection path.
• the boiler water sampling valve is normally controlled to open and close continuously or intermittently during combustion of the boiler.
• the boiler water is normally excessively concentrated, so that a predetermined ratio of boiler water is continuously or intermittently supplied from the boiler can. It is configured to discharge and maintain an appropriate boiler water concentration. That is, since the boiler discharges the concentrated boiler water as blow drainage, for example, a boiler water discharge path is connected to the lower part of the downcomer pipe or the boiler can body, and the boiler water discharge path includes a blow valve Is provided. Therefore, in the boiler having such a configuration, the boiler water discharge path is directly used as the boiler water sampling path without newly providing the boiler water sampling means, and the blow valve is used as the boiler water. It can be used as it is as a water collection valve.
• the boiler water addition means includes a boiler water supply path.
• One end side of this boiler water supply path is connected to the boiler water sampling path from the lower part of the downcomer and the boiler can body.
• the other end side of the boiler water supply path is connected to the upstream side of the boiler can body, for example, the water supply tank or the water supply path. That is, the boiler water collected from the boiler can is supplied to the upstream side of the boiler can through the boiler water collection path and the boiler water supply path.
• the feed water stored in the feed water tank and the boiler water are mixed uniformly.
• the inflow portion of the feed water and the inflow portion of the boiler water are arranged close to each other, and the feed water and the boiler water are uniformly mixed by the feed water flow flowing into the feed water tank.
• a circulation path is connected to the water supply tank, and the water supply in the water supply tank is circulated by a circulation pump, so that the water supply and the boiler water are uniformly mixed.
• a stirrer is provided in the water supply tank, and the water supply in the water supply tank is agitated to uniformly mix the water supply and boiler water.
• a water quality meter such as a pH meter may be provided in the water supply tank or the water supply path. Based on the detection result of the water quality meter, the amount of boiler water added to the water supply can be adjusted more accurately by controlling the opening and closing of the boiler water sampling valve.
• the water supply stored in the water supply tank is supplied to the boiler can body through the water supply path and stored as boiler water.
• This boiler water usually contains alkali components such as bicarbonate and carbonate and silica which is a corrosion inhibiting component.
• the boiler water When the boiler is burned, the boiler water is boiled by heating, and steam is generated. This steam is supplied to steam-using equipment in facilities such as factories.
• the alkali component contained in the boiler water is thermally decomposed by heating to produce hydroxide, and raises the pH of the boiler water.
• silica contained in boiler water is concentrated as steam is generated, and acts to form an anticorrosion film in the boiler can.
• the boiler device maintains the pH of the boiler water at a value capable of suppressing the corrosion of the non-passivated metal forming the boiler can body, specifically in the range of ⁇ 11-12.
• it is operated to maintain electrical conductivity that does not cause carryover (for example, 4000 / z SZcm or less). That is, during the combustion of the boiler, the boiler water sampling valve is controlled to be opened and closed, and a predetermined ratio (for example, an amount corresponding to 10 to 20% of the water supply amount) of alkaline boiler water is supplied to the boiler can. It drains from physical strength.
• the boiler water containing alkaline and concentrated silica discharged from the boiler can body is supplied with water to the boiler through the boiler water collection path and the boiler water supply path by the pressure in the boiler can body. Feed and mix to raise the pH and silica concentration of the feed water.
• the pH of the feed water mixed with boiler water is the corrosion of non-passivated metal in the lower part of the boiler can body (especially, in the case of a once-through boiler, the connection part between the heat transfer pipe and the lower header). It is adjusted so that it can be controlled within the range of pH 9 to ll.
• the silica concentration of feed water mixed with boiler water can form a film on the non-passivated metal in the lower part of the boiler can body (especially, in the case of a once-through boiler, the connection part between the heat transfer pipe and the lower header). It is adjusted so as to be a predetermined value or more.
• the feed water whose pH and silica concentration are adjusted is supplied to the boiler can body through the feed water path. Therefore, this first embodiment In the method, the alkali component and silica in the feed water are concentrated in the boiler can and collected, and then added to the feed water and reused repeatedly.
• the steam boiler apparatus according to the second embodiment mainly includes a boiler, an economizer, boiler water collecting means, and boiler water adding means.
• a boiler mainly includes a boiler, an economizer, boiler water collecting means, and boiler water adding means.
• the economizer is provided in the flue of the boiler, and is configured to preheat the feed water by exchanging heat between the exhaust gas from the boiler and the feed water to the boiler.
• the water inlet of the economizer is connected to the water supply tank through the water supply path.
• the water supply outlet of the economizer is connected to the lower part of the boiler can body.
• the boiler water collecting means includes the boiler water collecting path and the boiler water collecting valve, as in the first embodiment.
• the boiler water collection path is connected to, for example, the downcomer pipe or the lower part of the boiler can body in order to collect concentrated boiler water from the boiler can body, and the boiler water collection path includes the boiler water collection path.
• a sampling valve is provided. The boiler water sampling valve is normally controlled to open and close continuously or intermittently during combustion of the boiler.
• the boiler water addition means includes a storage tank, a boiler water supply path, and an addition pump.
• the storage tank stores boiler water collected from the boiler can body via the boiler water collection path, and one end side of the boiler water supply path is connected to the storage tank.
• the The other end side of the boiler water supply path is connected to the upstream side of the economizer, for example, the water supply tank or the water supply path.
• the boiler water supply path is provided with the addition pump. That is, the boiler water that is continuously or intermittently discharged from the boiler can is stored in the storage tank and then upstream of the economizer via the boiler water supply path. It is comprised so that it may be supplied to.
• the addition pump is controlled to operate continuously or intermittently during combustion of the boiler, that is, when feed water is supplied to the boiler can body.
• a heat exchanger may be provided in the water supply tank or the water supply path for the purpose of recovering the heat of the boiler water.
• the boiler water supply path is connected so that boiler water is supplied from the storage tank to the heat exchanger and the cooled boiler water is supplied to the feed water before being supplied to the economizer.
• the heat exchanger is provided in the feed water tank, the feed water is heated by the heat of the boiler water, and deoxygenation of the feed water is promoted. Therefore, when configured in this manner, corrosion due to dissolved oxygen in the heat transfer tube of the economizer can be effectively suppressed.
• the boiler water in the storage tank is directly supplied into the feed water stored in the water supply tank.
• the feed water is heated by the heat of the boiler water, and deoxygenation of the feed water is promoted. Therefore, if comprised in this way, the corrosion by the dissolved oxygen of the heat exchanger tube of the said economizer can be suppressed effectively.
• a water quality meter for example, a pH meter, may be provided in the water supply path, as in the first embodiment. Based on the detection result of the water quality meter, the amount of boiler water added to the feed water can be adjusted with higher accuracy by operating the addition pump.
• the steam boiler apparatus continuously or intermittently maintains a predetermined ratio (for example, 10 to 20 of the water supply amount) so as to maintain the pH of the boiler water in the range of 11 to 12. % Of alkaline boiler water is discharged while the boiler can is discharged. That is, during the combustion of the boiler, the boiler water sampling valve is controlled to open and close to discharge alkaline boiler water to the boiler can, and the boiler water is supplied to the storage tank via the boiler water sampling path. Then, the boiler water containing alkaline and concentrated silica in the storage tank is mixed with the feed water flowing upstream of the economizer, and the pH of the feed water is And increase the silica concentration.
• a predetermined ratio for example, 10 to 20 of the water supply amount
• the pH of the feed water mixed with the boiler water is adjusted to a value capable of suppressing the corrosion of the non-passivated metal in the economizer, specifically in the range of pH 9 to l l. It is done.
• the silica concentration of the feed water mixed with boiler water is adjusted to be equal to or higher than a predetermined value capable of forming a film on the non-passivated metal in the economizer.
• the feed water whose pH and silica concentration are adjusted is supplied to the economizer through the water supply path, and then supplied to the boiler can body. Therefore, in this second embodiment, the alkali component and silica in the feed water are collected while being concentrated in the boiler can, and then added to the feed water and repeatedly reused.
• the second embodiment it is possible to suppress the corrosion generated in the heat transfer tubes of the boiler and the economizer due to the influence of moisture. As a result, the boiler is prevented from being damaged and the steam can be supplied stably for a long period of time.
• FIG. 1 shows a schematic configuration diagram of the boiler apparatus according to the first embodiment.
• the boiler device 1 mainly includes a boiler 2, boiler water collecting means 3, and boiler water adding means 4.
• the boiler 2 is a so-called multi-tube water tube boiler, which is formed by standing a large number of water tubes (heat transfer tubes) 7, 7, ... between an upper header 5 and a lower header 6.
• Boiler can body 8 is provided.
• the upper header 5 is connected to a steam separator 9 through a steam supply path 10, and the upper portion of the steam separator 9 is connected to a load device (not shown) through a steam pipe 11.
• the lower part of the air / water separator 9 is connected by the lower header 6 and the downcomer 12 to collect the separated water.
• an exhaust pipe 14 is connected to the flue 13 of the boiler 2 in order to discharge exhaust gas generated by combustion.
• the lower header 6 is connected to a water supply tank 15 through a water supply path 16, and a water supply pump 17 is provided in the water supply path 16.
• a makeup water supply path 18 is connected to the upstream side of the water supply tank 15, and the upstream force is also softened to the makeup water supply path 18 in order.
• a water device 19 and a deoxygenation device 20 are provided.
• the water softener 19 removes hardness components (calcium ions and magnesium ions) from raw water such as tap water, industrial water, and groundwater, and prevents water from being generated in each water pipe 7. It is.
• the deoxygenation device 20 is a water treatment device that removes dissolved oxygen from raw water and suppresses corrosion in the lower header 6, the water tubes 7, the water supply path 16, and the like.
• a circulation path 21 is connected to the side surface of the water supply tank 15 in order to circulate the stored water supply, and a circulation pump 22 is provided in the circulation path 21.
• the water supply inlet 23 of the circulation path 21 is connected to the lower part of the water supply tank 15, and the water supply outlet 24 of the circulation path 21 is connected to the upper part of the water supply tank 15. That is, the water supply in the water supply tank 15 is extracted from the lower part of the water supply tank 15 and then returned to the upper part of the water supply tank 15.
• the boiler water collecting means 3 includes a boiler water collecting path 25 and a boiler water collecting valve 26.
• One end side of the boiler water collection path 25 is connected to the downcomer 12, and the boiler water collection path 25 is provided with the boiler water collection valve 26.
• the other end of the boiler water sampling path 25 is connected to a filter unit 27 that cleans the collected boiler water.
• the boiler water collecting valve 26 discharges a predetermined proportion of boiler water from the boiler can body 8 continuously or intermittently so as to maintain an appropriate boiler water concentration during combustion of the boiler 2.
• the controller (not shown) is controlled to open and close.
• the boiler water addition unit 4 includes a boiler water supply path 28.
• One end side of the boiler water supply path 28 is connected to the filter unit 27.
• the other end side of the boiler water supply path 28 is connected to a portion adjacent to the water supply inlet 23 in the lower part of the water supply tank 15.
• the raw water flowing through the makeup water supply path 18 is softened by ion exchange in the soft water device 19 and then deoxygenated in the deoxygenator 20.
• the deoxygenated soft water is supplied to the water supply tank 15 as water supply and stored.
• the water supply in the water supply tank 15 is supplied to the water supply path 16 by operating the water supply pump 17. And is stored in the boiler can body 8 as boiler water.
• the boiler water 8 boils by heating the boiler can body 8, and steam is generated.
• This steam is sent to the steam separator 9 through the steam supply path 10, and after the moisture in the steam is separated and the dryness is increased, the steam is supplied to the load device through the steam pipe 11. Supplied.
• the water separated by the steam separator 9, that is, the separated water is returned to the boiler can body 8 through the downcomer 12.
• Alkaline components that is, hydrogen carbonate and carbonate contained in the feed water are thermally decomposed by heating in the boiler can body 8 to produce hydroxides, and are concentrated to form boilers. Increase the pH of the water. At the same time, silica, which is a corrosion inhibitor contained in the water supply, is also concentrated.
• alkaline boiler water corresponding to 10 to 20% of the water supply amount is periodically collected so as to maintain the pH of the boiler water in the range of 11 to 12.
• the boiler can 8 is discharged. That is, a part of the alkaline boiler water is supplied to the filter unit 27 through the boiler water collection path 25.
• sludge and the like contained in boiler water is filtered and purified.
• the filtered boiler water is supplied to the water supply tank 15 via the boiler water supply path 28 by the steam pressure in the boiler can body 8.
• the water supply and boiler water are circulated through the circulation path 21 and mixed uniformly by operating the circulation pump 22.
• the feedwater to which boiler water is added increases its pH and silica concentration.
• the amount of boiler water added to the feed water is adjusted to a range of pH 9 to 11.5 so that corrosion occurring at the connecting portion between the lower header 6 and each water pipe 7 can be suppressed.
• the opening time and interval of sampling valve 26 are adjusted.
• FIG. 2 shows a schematic configuration diagram of the boiler apparatus according to the second embodiment.
• the same reference numerals as those in the first embodiment denote the same members, and a detailed description thereof will be omitted.
• the water supply path 18 extends toward the bottom of the water supply tank 15 by force. That is, the water supply processed by the soft water device 19 and the deoxygenation device 20 is configured to flow into the bottom of the water supply tank 15.
• the other end side of the boiler water supply path 28 is connected to a portion near the end of the water supply path 18 in the lower part of the water supply tank 15. That is, the feed water stream flowing into the bottom of the feed water tank 15 collides with the boiler water stream flowing in via the boiler water supply path 28.
• the raw water flowing through the makeup water supply path 18 is softened by ion exchange in the soft water device 19 and then deoxygenated in the deoxygenator 20.
• the deoxygenated soft water is supplied to the water supply tank 15 as water supply and stored.
• the water supply in the water supply tank 15 is supplied via the water supply path 16 by operating the water supply pump 17 and stored as boiler water in the boiler can body 8.
• the boiler water 8 is boiled by heating the boiler can body 8, and steam is generated.
• This steam is sent to the steam separator 9 through the steam supply path 10, and after the moisture in the steam is separated and the dryness is increased, the steam is supplied to the load device through the steam pipe 11. Supplied.
• the water separated by the steam separator 9, that is, the separated water is returned to the boiler can body 8 through the downcomer 12.
• Alkaline components that is, hydrogen carbonate and carbonate contained in the feed water are thermally decomposed by heating in the boiler can body 8 to produce hydroxides and are concentrated. Increase the pH of the water. At the same time, silica, which is a corrosion inhibitor contained in the water supply, is also concentrated.
• alkaline boiler water corresponding to 10 to 20% of the water supply amount is periodically collected so that the pH of the boiler water is maintained in the range of 11 to 12.
• the boiler can 8 is discharged. That is, a part of the alkaline boiler water is supplied to the filter unit 27 via the boiler water sampling path 25.
• sludge and the like contained in the boiler water is filtered and purified.
• the filtered boiler water is supplied to the boiler water supply by the steam pressure in the boiler can body 8.
• the water is supplied to the water supply tank 15 through the supply path 28.
• the water supply and the boiler water are uniformly mixed by the collision of the respective water streams.
• the feedwater to which boiler water is added increases its pH and silica concentration.
• the amount of boiler water added to the water supply is adjusted to a range of pH 9 to l l. 5 that can suppress corrosion occurring at the connecting portion between the lower header 6 and each water pipe 7.
• the opening time and interval of the water sampling valve 26 are adjusted.
• FIG. 3 shows a schematic configuration diagram of the boiler apparatus according to the third embodiment.
• the boiler device 29 in the third embodiment mainly includes an economizer 30 in addition to the boiler 2, the boiler water collecting means 3, and the boiler water adding means 4.
• an exhaust gas inlet 31 of the economizer 30 is connected to the flue 13, and an exhaust cylinder 14 is connected to the exhaust gas outlet 32 of the economizer 30.
• a heat transfer pipe 34 for circulating feed water is disposed for heat exchange with the exhaust gas, and the outlet side of the heat transfer pipe 34 is connected to the lower header 6. ing.
• the inlet side of the heat transfer tube 34 is connected to the water supply path 16.
• a soft water device 19 is provided in the makeup water supply path 18.
• the water supply tank 15 is provided with heat exchange ⁇ 35 for exchanging heat between the boiler water discharged from the boiler can body 8 and the feed water.
• the other end of the boiler water sampling path 25 is connected to the boiler water inlet 36 of the boiler.
• the boiler water addition means 4 includes the boiler water supply path 28, a storage tank 37, and an addition pump 38 as in the third embodiment.
• the storage tank 37 stores the boiler water discharged from the boiler can body 8 and cooled by the heat exchanger 35, so that the boiler water outlet 39 and the boiler water recovery path 40 of the heat exchanger 35 are stored. Connected with.
• the storage tank 37 is a part of the lower part of the water supply tank 15 that is close to the water supply inlet 23.
• the boiler water supply path 28, and the boiler water supply path 28 is provided with the addition pump 38.
• the addition pump 38 is controlled by a control unit (not shown) so as to operate in conjunction with the feed water pump 24 during combustion of the boiler 2.
• the raw water flowing through the makeup water supply path 18 is softened by ion exchange in the water softener 19.
• This soft water is supplied to the water supply tank 15 as water supply and stored.
• the water supply in the water supply tank 15 is supplied to the economizer 30 through the water supply path 16 by operating the water supply pump 17.
• This feed water is heat-exchanged with the exhaust gas in the heat transfer pipe 34 and preheated to a predetermined temperature.
• the preheated water supply is stored as boiler water in the boiler can body 8.
• the boiler water 8 boils by heating the boiler can body 8, and steam is generated.
• This steam is sent to the steam separator 9 through the steam supply path 10, and after the moisture in the steam is separated and the dryness is increased, the steam is supplied to the load device through the steam pipe 11. Supplied.
• the water separated by the steam separator 9, that is, the separated water is returned to the boiler can body 8 through the downcomer 12.
• Alkaline components that is, hydrogen carbonate and carbonate contained in the feed water are thermally decomposed by heating in the boiler can body 8 to produce hydroxides, and are concentrated to form boilers. Increase the pH of the water. At the same time, silica, which is a corrosion inhibitor contained in the water supply, is also concentrated.
• alkaline boiler water corresponding to 10 to 20% of the water supply amount is periodically collected so as to maintain the pH of the boiler water in the range of 11 to 12.
• the boiler can 8 is discharged. That is, a part of the alkaline boiler water is supplied to the heat exchange via the boiler water sampling route 25.
• the boiler water and the feed water in the feed water tank 15 are subjected to heat exchange, whereby the feed water is heated and dissolved oxygen in the feed water is reduced. Then, the boiler water cooled by the heat exchanger 35 is supplied to the storage tank 37 via the boiler water recovery path 40 and stored.
• FIG. 4 shows a schematic configuration diagram of the boiler apparatus according to the fourth embodiment.
• the same reference numerals as those in the first embodiment, the second embodiment, and the third embodiment denote the same members, and detailed descriptions thereof are omitted.
• a boiler water discharge path 41 is connected to the downcomer pipe 12, and a blow valve 42 is provided in the boiler water discharge path 41.
• one end side of the boiler water sampling path 25 is connected to the bottom of the lower pipe stopper 6, and the boiler water sampling valve 26 is provided in the boiler water sampling path 25.
• the blow valve 42 and the boiler water sampling valve 26 continuously or intermittently supply a predetermined ratio of boiler water to the boiler can so as to maintain an appropriate boiler water concentration during combustion of the boiler 2. Opening and closing is controlled by a controller (not shown) so that the body 8 is discharged.
• the water supply path 18 extends toward the bottom of the water supply tank 15 by force. That is, the water supply processed by the water softener 19 is configured to flow into the bottom of the water supply tank 15. Further, the other end side of the boiler water supply path 28 is connected to a portion near the end of the water supply path 18 in the lower part of the water supply tank 15. That is, the feed water stream flowing into the bottom of the feed water tank 15 collides with the boiler water stream flowing in via the boiler water supply path 28!
• the raw water flowing through the water supply path 18 is softened by ion exchange in the soft water device 19.
• This soft water is supplied to the water supply tank 15 as water supply and stored.
• the water supply in the water supply tank 15 is supplied to the economizer 30 through the water supply path 16 by operating the water supply pump 17.
• This feed water is heat-exchanged with the exhaust gas in the heat transfer pipe 34 and preheated to a predetermined temperature.
• the preheated water supply is stored as boiler water in the boiler can body 8.
• the boiler water 8 boils by heating the boiler can body 8, and steam is generated.
• This steam is sent to the steam separator 9 through the steam supply path 10, and after the moisture in the steam is separated and the dryness is increased, the steam is supplied to the load device through the steam pipe 11. Supplied.
• the water separated by the steam separator 9, that is, the separated water is returned to the boiler can body 8 through the downcomer 12.
• Alkaline components that is, hydrogen carbonate and carbonate contained in the feed water are thermally decomposed by heating in the boiler can body 8 to produce hydroxides, and are concentrated to form boilers. Increase the pH of the water. At the same time, silica, which is a corrosion inhibitor contained in the water supply, is also concentrated.
• alkaline boiler water in an amount corresponding to 10 to 20% of the water supply amount is periodically supplied so as to maintain the pH of the boiler water in the range of 11 to 12. Further, the boiler water collection valve 26 is controlled to open and close to discharge from the boiler can body 8. That is, a part of the alkaline boiler water is discharged out of the system through the boiler water discharge path 41.
• a part of the alkaline boiler water is supplied to the heat exchanger 35 through the boiler water collection path 25.
• the boiler water and the feed water in the feed water tank 15 are subjected to heat exchange, whereby the feed water is heated and dissolved oxygen in the feed water is reduced.
• the boiler water cooled by the heat exchange is supplied to the storage tank 37 through the boiler water recovery path 40 and stored.
• the addition pump 38 is operated while the water supply pump 17 is in operation (that is, during supply of water).
• the boiler water in the storage tank 37 is supplied to the water supply tank 15 through the boiler water supply path 28 by the discharge pressure of the addition pump 38.
• the water supply and the boiler water are mixed uniformly by the collision of the respective water streams.
• the feed water to which boiler water is added has its pH and Rica concentration increases.
• the amount of boiler water added to the water supply is the heat transfer tube
• FIG. 1 is a schematic configuration diagram of a boiler apparatus according to a first embodiment of the present invention.
• FIG. 2 is a schematic configuration diagram of a boiler apparatus according to a second embodiment of the present invention.
• FIG. 3 is a schematic configuration diagram of a boiler device according to a third embodiment of the present invention.
• FIG. 4 is a schematic configuration diagram of a boiler apparatus according to a fourth embodiment of the present invention.

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• Mechanical Engineering (AREA)
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• Chemical & Material Sciences (AREA)
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• Water Supply & Treatment (AREA)
• Organic Chemistry (AREA)
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• 2005
  • 2005-03-29 JP JP2005094952A patent/JP2006275410A/ja active Pending
• 2006
  • 2006-03-29 KR KR1020077022062A patent/KR20070114780A/ko not_active Application Discontinuation
  • 2006-03-29 CN CNA200680010329XA patent/CN101184955A/zh active Pending
  • 2006-03-29 WO PCT/JP2006/306404 patent/WO2006104181A1/ja active Application Filing
  • 2006-03-29 CA CA002603431A patent/CA2603431A1/en not_active Abandoned

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