CN219243567U - Alleviate device that economizer deposition corrodes - Google Patents
Alleviate device that economizer deposition corrodes Download PDFInfo
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- CN219243567U CN219243567U CN202320121415.9U CN202320121415U CN219243567U CN 219243567 U CN219243567 U CN 219243567U CN 202320121415 U CN202320121415 U CN 202320121415U CN 219243567 U CN219243567 U CN 219243567U
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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The utility model particularly relates to the technical field of soot blowers, and discloses a device for relieving soot deposition corrosion of an economizer. The boiler comprises a boiler body and a hearth positioned in the boiler, wherein a combustion chamber is arranged at the bottom of the hearth, a fire grate is arranged in the combustion chamber, a fire grate air chamber is arranged on one side of the combustion chamber, air is introduced into the combustion chamber through the fire grate air chamber, oxygen is provided for combustion of fuel, and a primary economizer and a secondary economizer are arranged in a tail flue gas channel of the boiler body. According to the utility model, the water inlet temperature of the secondary economizer is increased, the low-temperature corrosion is slowed down, the tail flue gas temperature is increased, the occurrence of low-temperature dew condensation caused by being in a low-temperature environment is prevented, and the occurrence of corrosion aggravation caused by the low-temperature environment is reduced by additionally arranging the economizer circulating pump and the simple pipeline design.
Description
Technical Field
The utility model relates to the technical field of gas equipment, in particular to a device for relieving dust accumulation corrosion of an economizer.
Background
As known, in the heat loss of the boiler, the smoke exhaust heat loss is the largest heat loss of the boiler and accounts for 60% -70% of the heat loss of the boiler, wherein the main factor influencing the smoke exhaust heat loss is the smoke exhaust temperature, and the boiler economizer can reduce the smoke temperature, recover the smoke heat, improve the heat efficiency of the boiler and save fuel. The economizer is a device which is arranged at the lower part of a tail flue of the boiler and is used for recovering the waste heat of the exhausted smoke.
In recent years, with the improvement of emission standards of nitrogen oxides of coal-fired boilers, for boilers adopting a non-selective catalytic reduction (SNCR) denitration mode, a large amount of urea is sprayed into a hearth in the denitration process, wherein a considerable part of ammonia is volatilized and discharged along with flue gas, the part of ammonia which does not participate in denitration possibly generates ammonium bisulfate with sulfur trioxide in the flue gas, and the ammonium bisulfate adheres to fly ash in the flue gas to cause deposition on downstream equipment and pipelines, so that the blocking, corrosion and resistance increase of a boiler tail system are caused.
In the actual use process, as the boiler using unit reserves 10% -30% of the margin of the output force when the boiler equipment is purchased in design, and the operation load of the heating boiler in winter is greatly influenced by weather temperature, the condition that the boiler cannot reach rated load and continuously operate often occurs, particularly in the early cold and the final cold periods, the boiler is kept to operate under lower load, the flow rate and the temperature of the flue gas at the outlet of the hearth are lower, the dust accumulation, low-temperature corrosion and flue corrosion of the economizer are aggravated, the production accidents such as unsmooth smoke discharge of the boiler, positive pressure combustion, forced furnace shutdown and the like are caused, and the safe and stable operation of the boiler is influenced. Therefore, the dust accumulation and corrosion of the boiler economizer are a great problem which an enterprise needs to face at present, and in order to solve one of the technical problems, the application document provides a device for relieving the dust accumulation corrosion of the economizer.
Disclosure of Invention
Aiming at the technical problems, the utility model aims to provide a device for relieving the ash deposition corrosion of the economizer, which is characterized in that a circulating pump of the economizer and a simple pipeline design are additionally arranged to improve the water inlet temperature of the secondary economizer, slow down the low-temperature corrosion, improve the tail flue gas temperature, prevent the occurrence of low-temperature dewing caused by the low-temperature environment and reduce the occurrence of the corrosion aggravation caused by the low-temperature environment.
The technical aim of the utility model is realized by the following technical scheme: the device for relieving the dust accumulation corrosion of the economizer comprises a boiler body and a hearth positioned in the boiler, wherein a combustion chamber is arranged at the bottom of the hearth, a fire grate is arranged in the combustion chamber, a fire grate air chamber is arranged at one side of the combustion chamber, air is introduced into the combustion chamber through the fire grate air chamber to provide oxygen for the combustion of fuel, a primary economizer and a secondary economizer are arranged in a tail flue gas channel of the boiler body, the primary economizer and the secondary economizer are arranged in parallel and are communicated, and an economizer circulating pump is arranged on a water inlet pipe of the secondary economizer;
the water outlet pipelines at the left side and the right side of the top end surface of the boiler body are respectively communicated with two groups of connecting pipes, the other ends of the connecting pipes are communicated with pipelines, and the other ends of the pipelines are connected with a water inlet of a circulating pump of the economizer.
By adopting the technical scheme, the method for introducing a small amount of boiler effluent into the water inlet of the secondary economizer improves the water inlet temperature of the secondary economizer, improves the tail flue gas temperature and prevents the low-temperature dew formation.
The utility model is further provided with:
the boiler is characterized in that water outlet pipelines at the left side and the right side of the top end face of the boiler body are respectively communicated with two groups of connecting pipes, the two groups of connecting pipes are communicated with the pipeline through two-position three-way electromagnetic control valves (the two-position three-way electromagnetic control valves are two-in and one-out), the connecting pipes and the pipeline are made of stainless steel pipes, and the other end of the pipeline is connected with a water inlet of an economizer circulating pump.
By adopting the technical scheme, the boiler outlet water in the boiler body is introduced into the secondary economizer through the connecting pipe and the pipeline.
The utility model is further provided with:
the economizer circulating pump adopts a circulating pump common in the market, and a control valve is arranged on a pipeline between an outlet of the economizer circulating pump and an inlet of the secondary economizer.
By adopting the technical scheme, the state of water flow is regulated and controlled through the control valve.
The utility model is further provided with:
the tail flue gas channel positioned on the boiler body is provided with an air preheater, an air inlet of the air preheater is connected with an outlet of a blower through an air pipe, the blower adopts a blower with model GY5-51, and an inlet end of the blower is connected with an air inlet pipe of the blower.
By adopting the technical scheme, the external air is conveyed into the air preheater through the air inlet pipe of the blower.
The utility model is further provided with:
the outlet of the air preheater is communicated with a fire grate air chamber through a pipeline, and the fire grate air chamber is communicated with the combustion chamber.
By adopting the technical scheme, the external air is introduced into the air preheater through the blower, and then the air in the air preheater is conveyed into the air furnace exhaust chamber.
The utility model is further provided with:
a cloth bag dust collector is arranged in the tail flue gas channel of the boiler body, the other end of the tail flue gas channel of the boiler body is communicated with a draught fan, and the draught fan adopts a common draught fan in the market.
By adopting the technical scheme, the induced draft fan is used for exhausting the flue gas generated in the hearth, maintaining a certain negative pressure in the hearth and overcoming the pressure loss in the flue gas channel at the tail part of the boiler body, and the induced draft fan is used for dividing the hot air above the flue gas channel at the tail part of the boiler body into one, two and three air to enter the hearth after being heated by the preheater, so that the description of the induced draft fan is the prior art and is not described in detail here.
The utility model is further provided with:
the coal economizer comprises a first-stage coal economizer and a second-stage coal economizer, wherein the first-stage coal economizer and the second-stage coal economizer are internally provided with coal economizer pipelines, the coal economizer pipelines are arranged in a plurality of groups, are arranged up and down in parallel, a shielding plate is arranged between the topmost coal economizer pipeline and the bottommost coal economizer pipeline, and soot blowing holes are formed in the middle of the shielding plate.
By adopting the technical scheme, when the high-temperature dust-containing flue gas passes through the economizer by additionally arranging the shielding plate, dust is not easy to accumulate on the surface of the economizer pipeline.
The utility model is further provided with:
the economizer pipeline is provided with an inlet end of the economizer, a baffle is fixedly arranged in the inlet end of the economizer, the baffle is obliquely arranged, a blocking piece is arranged below the baffle, the blocking piece is closely attached to the inner wall of the inlet end of the coal economizer, the end face of the top of the blocking piece is fixedly provided with a leakage-proof piece, the leakage-proof piece is arranged in an umbrella shape, and the leakage-proof piece is positioned on the baffle and the coal economizer pipeline on one side of the leakage-proof piece and is communicated with the discharge pipe.
By adopting the technical scheme, when the flue gas water vapor is condensed into water in use, at the moment, the condensed water flows into the economizer pipeline through the inlet end of the economizer, the flowing condensed water flows to the position of the baffle plate through the economizer pipeline, at the moment, the water is introduced into the discharge pipe through the obliquely arranged baffle plate, if a small amount of water exists, the water continuously flows downwards through the baffle plate, at the moment, the lower leakage prevention piece can prevent the water flow from flowing downwards, the water flows into the discharge pipe through the outlet positioned at one side of the leakage prevention piece, and the water can be thoroughly prevented from entering the inside of the economizer through the blocking piece, so that the machine is damaged and stopped.
In summary, the beneficial technical effects of the utility model are as follows:
according to the utility model, the water inlet temperature of the secondary economizer is increased, the low-temperature corrosion is slowed down, the tail flue gas temperature is increased, the occurrence of low-temperature dew condensation caused by being in a low-temperature environment is prevented, and the occurrence of corrosion aggravation caused by the low-temperature environment is reduced by additionally arranging the economizer circulating pump and the simple pipeline design.
Drawings
FIG. 1 is a schematic overall construction of an embodiment of the present utility model;
fig. 2 is an internal structural view of an economizer according to an embodiment of the present utility model.
Reference numerals: 1. a furnace; 2. a grate plenum; 3. a primary economizer; 4. a combustion chamber; 5. a slag removal box; 6. a secondary economizer; 7. a connecting pipe; 8. a pipe; 9. an air preheater; 10. an air inlet pipe of the blower; 11. a bag-type dust collector; 12. a blower; 13. an induced draft fan; 15. an inlet end of the economizer; 16. a shielding plate; 17. an economizer line; 18. a discharge pipe; 19. a baffle; 20. a leak-proof stopper; 21. a blocking member; 22. soot blowing holes; 23. a control valve; 24. a economizer circulation pump; 25. a boiler body.
Detailed Description
The present utility model will be described more fully hereinafter with reference to the accompanying examples.
Referring to fig. 1-2, a device for relieving the accumulated ash corrosion of an economizer comprises a boiler body 25 and a hearth 1 positioned in the boiler, wherein a combustion chamber 4 is arranged at the bottom of the hearth 1, a fire grate is arranged in the combustion chamber 4, a fire grate air chamber 2 is arranged at one side of the combustion chamber 4, air is introduced into the combustion chamber 4 through the fire grate air chamber 2 to provide oxygen for the combustion of fuel, a primary economizer 3 and a secondary economizer 6 are arranged in a tail flue gas channel of the boiler body 25, the primary economizer 3 and the secondary economizer 6 are arranged in parallel and are communicated, and an economizer circulating pump 24 is arranged on a water inlet pipe of the secondary economizer 6;
the water outlet pipelines at the left side and the right side of the top end surface of the boiler body 25 are respectively communicated with two groups of connecting pipes 7, the two groups of connecting pipes 7 are communicated with a pipeline 8 through a two-position three-way electromagnetic control valve (the two-position three-way electromagnetic control valve is two-in and one-out), the connecting pipes 7 and the pipeline 8 are both made of stainless steel pipes, the other end of the pipeline 8 is connected with a water inlet of an economizer circulating pump 24, and boiler outlet water in the boiler body is introduced into a secondary economizer through the connecting pipes and the pipeline; the economizer circulating pump adopts a circulating pump common in the market, a control valve 23 is arranged on a pipeline between an outlet of the economizer circulating pump and an inlet of the secondary economizer 6, and the state of water flow is regulated and controlled through the control valve;
the tail flue gas channel that is located boiler body 25 is provided with air heater 9, air heater 9's air inlet passes through the export that the air-blower 12 is connected to the trachea, the air-blower adopts the air-blower that the model is GY5-51, air-blower 12's inlet end is connected air-blower air-supply line 10, in carrying air heater 9 with external air through the air-blower air-supply line, air heater 9 export passes through pipeline intercommunication grate plenum 2, the grate plenum is linked together with the combustion chamber, and inside introducing air heater with external air through the air-blower, then in carrying to the blast furnace exhaust chamber through the air in the air heater.
Referring to fig. 1-2, further, a bag dust collector 11 is disposed in a tail flue gas channel of the boiler body 25, the other end of the tail flue gas channel of the boiler body 25 is communicated with a draught fan 13, the draught fan adopts a common draught fan in the market, the draught fan is used for exhausting flue gas generated in a furnace chamber, a certain negative pressure is maintained in the furnace chamber, the pressure loss in the tail flue gas channel of the boiler body is overcome, the draught fan divides hot air above the tail flue gas channel of the boiler body into one, two and three air flows into the furnace chamber after being heated by a preheater, and the description about the draught fan is the prior art and is not described in detail herein.
Referring to fig. 1-2, further, the primary economizer 3 and the secondary economizer 6 are both internally provided with economizer pipes 17, the economizer pipes 17 are arranged in multiple groups and are arranged in parallel up and down, a shielding plate 16 is arranged between the topmost economizer pipe and the bottommost economizer pipe, and a soot blowing hole 22 is formed in the middle of the shielding plate 16.
In the present embodiment, by adding the shielding plate 16, dust is less likely to accumulate on the surface of the economizer pipe 17 when high-temperature dust-laden flue gas passes through the economizer.
The utility model is further provided with:
the economizer pipeline 17 is provided with an economizer inlet end 15, a baffle 19 is fixedly arranged inside the position of the economizer inlet end, the baffle 19 is obliquely arranged, a blocking piece 21 is arranged at the position below the baffle 19, the blocking piece 21 is closely attached to the inner wall of the economizer inlet end, a leakage-proof stop piece 20 is fixedly arranged on the end face of the top of the blocking piece 21, the leakage-proof stop piece 20 is arranged in an umbrella shape, and the economizer pipeline 17 on one side of the baffle 19 and the leakage-proof piece 20 is communicated with a discharge pipe 18.
By adopting the technical scheme, when the flue gas water vapor is condensed into water during use, at the moment, the condensed water flows into the economizer pipeline 17 through the inlet end of the economizer, the condensed water flows into the position of the baffle 19 through the economizer pipeline, at the moment, the water is introduced into the discharge pipe 18 through the obliquely arranged baffle, if a small amount of water flows downwards through the baffle, the lower leakage prevention piece can prevent the water flow from flowing downwards, the water flows into the discharge pipe through the outlet positioned at one side of the leakage prevention piece, and the water can be thoroughly prevented from entering the inside of the economizer through the blocking piece 21, so that the machine is damaged and stopped.
Referring to fig. 1-2, further,
the application flow and the working principle of the utility model are as follows:
the utility model aims to solve the problems that when a boiler runs under low load, water temperature of a boiler economizer and smoke temperature of a tail flue are too low, two groups of connecting pipes 7 are respectively led to left and right water outlet pipelines at the top of a boiler body, after the pipelines 8 are converged, the other end of the pipeline 8 is connected with an inlet of a newly arranged economizer circulating pump 24 positioned at a position of 7m, an outlet of the economizer circulating pump 24 is connected to a water inlet pipeline of a secondary economizer 6 and a control valve 23 is arranged, and the water inlet temperature of the secondary economizer is improved and the smoke temperature of the tail flue of the boiler body is improved by a method of leading a small amount of water from the boiler body to the water inlet of the secondary economizer of the boiler body, so that low-temperature condensation is prevented; when the boiler body runs under high load, a control valve of the secondary economizer is opened, and a circulating pump of the economizer is closed; therefore, ash deposition and low-temperature corrosion are easy to occur during the low-load operation period of the boiler, and the stable operation time of the boiler is improved.
The above description is only a preferred embodiment of the present utility model, and is not intended to limit the scope of the present utility model. All equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.
Claims (6)
1. The utility model provides a alleviate device that economizer deposition corrodes, includes the boiler body to and be located the inside furnace of boiler, furnace bottom is provided with combustion chamber, its characterized in that: the air is introduced into the combustion chamber through the air chamber, oxygen is provided for combustion of fuel, a primary economizer and a secondary economizer are arranged in a tail flue gas channel of the boiler body, the primary economizer and the secondary economizer are arranged in parallel and are communicated, and an economizer circulating pump is arranged on a water inlet pipe of the secondary economizer; the water outlet pipelines at the left side and the right side of the top end surface of the boiler body are respectively communicated with two groups of connecting pipes, the other ends of the connecting pipes are communicated with pipelines, and the other ends of the pipelines are connected with a water inlet of a circulating pump of the economizer.
2. The device for relieving soot corrosion of an economizer of claim 1, wherein: the connecting pipe and the pipeline are both made of stainless steel pipes, the other end of the pipeline is connected with a water inlet of the economizer circulating pump, and a control valve is arranged on the pipeline between the outlet of the economizer circulating pump and the inlet of the secondary economizer.
3. The device for relieving soot corrosion of an economizer of claim 1, wherein: the tail flue gas channel positioned at the boiler body is provided with an air preheater, an air inlet of the air preheater is connected with an outlet of a blower through an air pipe, an inlet end of the blower is connected with an air inlet pipe of the blower, the outlet of the air preheater is communicated with a fire grate air chamber through a pipeline, and the fire grate air chamber is communicated with a combustion chamber.
4. The device for relieving soot corrosion of an economizer of claim 1, wherein: a cloth bag dust collector is arranged in the tail flue gas channel of the boiler body, and the other end of the tail flue gas channel of the boiler body is communicated with a draught fan.
5. The device for relieving soot corrosion of an economizer of claim 1, wherein: the coal economizer pipelines are arranged in the primary coal economizer and the secondary coal economizer, a plurality of groups of coal economizer pipelines are arranged, the coal economizer pipelines are arranged in parallel up and down, and a shielding plate is arranged between the topmost coal economizer pipeline and the bottommost coal economizer pipeline.
6. The device for relieving soot corrosion of an economizer of claim 5, wherein: the economizer pipeline is provided with an inlet end of the economizer, a baffle is fixedly arranged in the inlet end of the economizer, the baffle is obliquely arranged, a blocking piece is arranged below the baffle, the blocking piece is closely attached to the inner wall of the inlet end of the coal economizer, the end face of the top of the blocking piece is fixedly provided with a leakage-proof piece, the leakage-proof piece is arranged in an umbrella shape, and the leakage-proof piece is positioned on the baffle and the coal economizer pipeline on one side of the leakage-proof piece and is communicated with the discharge pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320121415.9U CN219243567U (en) | 2023-01-29 | 2023-01-29 | Alleviate device that economizer deposition corrodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320121415.9U CN219243567U (en) | 2023-01-29 | 2023-01-29 | Alleviate device that economizer deposition corrodes |
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| Publication Number | Publication Date |
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| CN219243567U true CN219243567U (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320121415.9U Active CN219243567U (en) | 2023-01-29 | 2023-01-29 | Alleviate device that economizer deposition corrodes |
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| CN (1) | CN219243567U (en) |
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2023
- 2023-01-29 CN CN202320121415.9U patent/CN219243567U/en active Active
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