CN218645581U - System for preventing special waste fluidized bed incinerator economizer low temperature corrodes - Google Patents

Abstract

The utility model relates to a system for preventing special waste fluidized bed incinerator economizer low temperature corrosion, including incinerator body, setting up quench ash removal section and economizer section behind the waste heat recovery section, distribute several exhaust caps on the grid plate of incinerator body, there are water-cooled tubes in the middle of every exhaust cap on the grid plate, one end of the water-cooled tube is connected with the input tube of deoxygenated water, another end is connected with the delivery tube of deoxygenated water; the quenching ash removal section comprises an ash bucket with an open top, and a spraying component for spraying water mist downwards is arranged right above the ash bucket; the economizer section comprises an economizer tube bundle, and a water inlet of the economizer tube bundle is connected with a deoxygenated water output pipe. Reasonable in design sets up the water-cooled tube on the grid plate that burns burning furnace for the heating deoxidization water, protects the grid plate on the one hand, and on the other hand improves the temperature of intaking of economizer, avoids making the flue gas dewfall because of the temperature is too low, corrodes the economizer pipe, ensures that special waste fluidized bed burns supporting economizer of burning furnace can long-term stable use.

Description

System for preventing special waste fluidized bed incinerator economizer low temperature corrosion

The technical field is as follows:

the utility model relates to a prevent system that special waste fluidized bed burns burning furnace economizer low temperature corrosion.

Background art:

the incinerator is generally provided with a coal economizer at the rear section of a boiler, the boiler feed water is heated by fully utilizing the heat of the flue gas at the tail part of the boiler, the temperature of the flue gas is reduced while the temperature of the feed water is increased, the heat loss of the flue gas is reduced, and the boiler efficiency is improved. Meanwhile, after the feed water temperature of the boiler is increased, the temperature difference of the steam drum wall is reduced, the thermal stress is correspondingly reduced, and the service life of the steam drum is prolonged.

When special waste fluidized bed incinerator burns industrial waste, because after the quench section, the temperature has fallen to below 200 degrees, and because the gas composition is complicated, contains corrosive gas, and the economizer metal wall has been close to the acid dew point, causes equipment corrosion easily, corrodes and can cause the equipment poling, leaks to make equipment efficiency reduce if there is the oxygen-eliminating water, and the humidity can aggravate the deposition for the economizer inefficacy.

The utility model has the following contents:

the utility model discloses make the improvement to the problem that above-mentioned prior art exists, promptly the utility model aims to solve the technical problem that a prevent that special waste material fluidized bed from burning furnace economizer low temperature corrosion's system is provided, reasonable in design ensures that special waste material fluidized bed burns burning furnace supporting economizer can long-term stable the use.

In order to realize the purpose, the utility model discloses a technical scheme is: a system for preventing low-temperature corrosion of a coal economizer of a special waste fluidized bed incinerator comprises an incinerator body, a quenching ash removal section and a coal economizer section, wherein the quenching ash removal section and the coal economizer section are arranged on the rear side of a waste heat recovery section of the incinerator body and are sequentially arranged along the flow direction of flue gas; the quenching ash removal section comprises an ash bucket with an open top, and a spraying component for spraying water mist downwards is arranged right above the ash bucket; the economizer section comprises an economizer tube bundle, and a water inlet of the economizer tube bundle is connected with a deoxygenated water output pipe.

Furthermore, the water-cooling pipe is embedded into the air distribution plate.

Furthermore, the spraying assembly comprises a plurality of double-fluid spray guns, the double-fluid spray guns are connected with the water tank through water pipes, and water pumps are installed on the water pipes.

Furthermore, the bottom of ash bucket is connected with ash storage tank through arranging the material pipe, ash storage tank's bottom is connected with the unloading pipe.

Further, a first gate valve is mounted at the upper end of the discharge pipe, and a gravity valve is arranged below the first gate valve; and a second gate valve is installed at the upper end of the discharging pipe, and a star-shaped discharging valve is arranged below the second gate valve.

Furthermore, a bag-type dust collector and a pressure release valve are installed at the top of the ash storage tank.

Furthermore, a ceramic sleeve is arranged at a water inlet of the economizer tube bundle.

Furthermore, a water outlet of the economizer pipe bundle is connected with an upper boiler of the waste heat recovery section through a deaerated water discharge pipe.

Compared with the prior art, the utility model discloses following effect has: (1) The water-cooled tube is arranged on the air distribution plate of the incinerator and used for heating the deaerated water, so that the air distribution plate is protected, the water inlet temperature of the economizer is increased, the phenomenon that smoke is condensed due to too low temperature and the economizer tube is corroded is avoided, and the economizer matched with the special waste fluidized bed incinerator can be stably used for a long time; (2) Through setting up the rapid cooling ash removal section, when the rapid cooling flue gas, get rid of partial smoke and dust, reduce smoke and dust concentration in the flue gas, reduce the dew point of flue gas, reduce the adhesion of smoke and dust on the economizer tube bank simultaneously.

Description of the drawings:

fig. 1 is a schematic configuration diagram of an embodiment of the present invention.

The specific implementation mode is as follows:

the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.

As shown in fig. 1, the utility model relates to a system for preventing special waste fluidized bed incinerator economizer low temperature corrosion, including incinerator body 1, set up in the waste heat recovery section 2 rear side of incinerator body 1 and along the rapid cooling ash removal section 3 and the economizer section 4 that the flue gas flow direction arranged in proper order, incinerator body, rapid cooling ash removal section and economizer section communicate through the pipeline in proper order, incinerator body 1 includes plenum 5, air distribution plate 6, dense phase district 7 and dilute phase district 8 that set gradually from bottom to top, air distribution plate 6 is last to distribute and has a plurality of hood 9, makes the primary air that comes from the plenum evenly distributed in dense phase district; a water-cooled tube 10 is arranged in the middle of each exhaust cap 9 on the air distribution plate 6, one end of the water-cooled tube 10 is connected with a deoxygenated water input tube 11, the other end of the water-cooled tube 10 is connected with a deoxygenated water output tube 12, and deoxygenated water enters the water-cooled tube through the deoxygenated water input tube and is output from the deoxygenated water output tube; the quenching ash removal section 3 comprises an ash bucket 13 with an open top, and a spraying assembly 14 for spraying water mist downwards is arranged right above the ash bucket 13; the economizer section 4 comprises an economizer tube bundle 15, a water inlet of the economizer tube bundle 15 is connected with a deoxygenated water output pipe 12, and deoxygenated water output by the deoxygenated water output pipe enters the economizer tube bundle. Set up the water-cooled tube on the grid plate that burns burning furnace for heating the oxygen-removed water, on the one hand protection grid plate, on the other hand improve the temperature of intaking of economizer, avoid making the flue gas dewfall because of the temperature is too low, corrode the economizer pipe.

In this embodiment, the water cooling pipe 10 is embedded in the air distribution plate 6. In the production process, deoxygenated water from the deoxygenated water input pipe enters the water cooling pipe to absorb the heat of part of the air distribution pipe, and the deoxygenated water is heated and then flows to the economizer pipe bundle.

In this embodiment, the spraying assembly 14 includes a plurality of two-fluid spray guns 16, the two-fluid spray guns 16 are connected to a water tank 18 through water pipes 17, a water pump 19 is installed on the water pipes, and fresh water is disposed in the water tank. When the double-fluid spray gun works, the water pump conveys water in the water tank to the double-fluid spray gun, and the double-fluid spray gun atomizes fresh water in the water tank and then sprays the atomized fresh water into flue gas so as to reduce the temperature of the flue gas from about 680 ℃ to about 190 ℃ within 1 second. And part of smoke dust in the humidified smoke falls into an ash bucket.

In this embodiment, the bottom of the ash bucket 13 is connected with an ash storage tank 21 through a discharge pipe 20, a first gate valve 22 is installed at the upper end of the discharge pipe 20, and a gravity valve 23 is arranged below the first gate valve 22. The bottom of the ash storage tank 21 is connected with a blanking pipe 24, the upper end of the blanking pipe 24 is provided with a second gate valve 25, and a star-shaped discharge valve 26 is arranged below the second gate valve 25; the top of the ash storage tank 21 is provided with a bag-type dust collector 27 and a pressure release valve 28. In the production process, first push-pull valve is in normally open state, and after the smoke and dust that collects in the ash bucket reachd certain weight, the gravity valve was opened, and during the smoke and dust got into the storage ash can, the sack cleaner and the pressure release valve at storage ash can top were used for guaranteeing storage ash can safety, and second push-pull valve and star type blowoff valve are used for controlling the smoke and dust in the discharge storage ash can, and storage ash can discharge's smoke and dust bagging-off carries out innoxious the processing follow-up.

In this embodiment, the ceramic sleeve 29 is disposed at the water inlet of the economizer tube bundle 15, so as to protect the economizer tube bundle and prevent the economizer tube bundle from being corroded due to moisture condensation of flue gas, and the ceramic sleeve is convenient to replace.

In this embodiment, the water outlet of the economizer tube bundle 15 is connected to the upper drum of the waste heat recovery section 2 through a deaerated water discharge pipe. Deoxygenated water from the water cooling pipe enters from a water inlet of the economizer pipe bundle, reversely exchanges heat with flue gas, then exits from the economizer pipe bundle and enters an upper drum of the waste heat recovery section. It should be noted that the waste heat recovery structure of the waste heat recovery section is the prior art, and the waste heat recovery structure on the existing incinerator is directly adopted, which is not repeated herein.

The specific implementation process comprises the following steps: the deoxidized water from the deoxidized water input pipe 11 enters the water cooling pipe 10 to absorb the heat of part of the air distribution plate 6, and the deoxidized water is heated and then flows to the economizer pipe bundle 15 through the deoxidized water output pipe 12; the waste enters a dense phase zone 7 of the incinerator and is incinerated under the action of primary air, and the generated flue gas enters a subsequent dilute phase zone 8 for temperature rise and then enters a boiler section for waste heat utilization. The quenching ash removal section 3 is arranged at the rear side of the waste heat recovery section 2, and the double-fluid spray gun 16 atomizes the fresh water from the water tank 18 and sprays the atomized fresh water into the flue gas so as to reduce the temperature of the flue gas from about 680 ℃ to about 190 ℃ within 1 second. Part of smoke dust in the humidified smoke gas falls into the ash bucket 13, the first gate valve 22 is in a normally open state, when the smoke dust collected in the ash bucket 13 reaches a certain weight, the gravity valve 23 is opened, the smoke dust enters the ash storage tank 21, and the top of the ash storage tank 21 is provided with a bag-type dust collector and a pressure release valve for ensuring the safety of the storage tank. Deoxygenated water from the water cooling pipe 10 enters from a water inlet of the economizer pipe bundle 15, reversely exchanges heat with flue gas, then exits the economizer and enters an upper boiler barrel of the waste heat recovery section. The flue gas exchanges heat with the economizer, is treated by a subsequent flue gas treatment device 30 to reach the standard, and is discharged through a chimney 31.

The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.

The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the technical solution of the present invention, the present invention should be covered by the technical solution of the present invention.

Claims (8)

1. The utility model provides a prevent system that special waste fluidized bed burns burning furnace economizer low temperature corrosion, includes burns burning furnace body, sets up at the waste heat recovery section rear side that burns burning furnace body and along quench ash removal section and the economizer section that flue gas flow direction arranged in proper order, its characterized in that: the incinerator body comprises an air chamber, an air distribution plate, a dense-phase area and a dilute-phase area which are sequentially arranged from bottom to top, a plurality of exhaust caps are distributed on the air distribution plate, a water-cooling pipe is arranged in the middle of each exhaust cap on the air distribution plate, one end of each water-cooling pipe is connected with a deoxygenated water input pipe, and the other end of each water-cooling pipe is connected with a deoxygenated water output pipe; the quenching ash removal section comprises an ash bucket with an open top, and a spraying component for spraying water mist downwards is arranged right above the ash bucket; the economizer section comprises an economizer tube bundle, and a water inlet of the economizer tube bundle is connected with a deoxygenated water output pipe.

2. The system for preventing low-temperature corrosion of an economizer of a special waste fluidized bed incinerator according to claim 1, characterized in that: the water-cooling pipe is embedded in the air distribution plate.

3. The system for preventing low-temperature corrosion of an economizer of a special waste fluidized bed incinerator according to claim 1, characterized in that: the spraying assembly comprises a plurality of double-fluid spray guns, the double-fluid spray guns are connected with the water tank through water pipes, and water pumps are installed on the water pipes.

4. The system for preventing low-temperature corrosion of an economizer of a special waste fluidized bed incinerator according to claim 1, characterized in that: the bottom of ash bucket is connected with ash storage tank through arranging the material pipe, ash storage tank's bottom is connected with the unloading pipe.

5. The system for preventing low-temperature corrosion of an economizer of a special waste fluidized bed incinerator according to claim 4, characterized in that: a first gate valve is installed at the upper end of the discharging pipe, and a gravity valve is arranged below the first gate valve; and a second gate valve is installed at the upper end of the discharging pipe, and a star-shaped discharging valve is arranged below the second gate valve.

6. The system for preventing low-temperature corrosion of an economizer of a special waste fluidized bed incinerator according to claim 4, characterized in that: and a bag-type dust collector and a pressure release valve are arranged at the top of the ash storage tank.

7. The system for preventing low-temperature corrosion of an economizer of a special waste fluidized bed incinerator according to claim 1, characterized in that: and a ceramic sleeve is arranged at a water inlet of the economizer tube bundle.

8. The system for preventing low-temperature corrosion of an economizer of a special waste fluidized bed incinerator according to claim 1, characterized in that: and the water outlet of the economizer pipe bundle is connected with the upper boiler of the waste heat recovery section through a deaerated water discharge pipe.

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