CN113566209A - Method and system for inhibiting low-temperature corrosion of boiler air preheater - Google Patents
Method and system for inhibiting low-temperature corrosion of boiler air preheater Download PDFInfo
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- CN113566209A CN113566209A CN202110696159.1A CN202110696159A CN113566209A CN 113566209 A CN113566209 A CN 113566209A CN 202110696159 A CN202110696159 A CN 202110696159A CN 113566209 A CN113566209 A CN 113566209A
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- 230000007797 corrosion Effects 0.000 title claims abstract description 49
- 238000005260 corrosion Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 33
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 17
- 239000004071 soot Substances 0.000 claims abstract description 94
- 239000003546 flue gas Substances 0.000 claims abstract description 55
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 52
- 238000007664 blowing Methods 0.000 claims abstract description 24
- 239000002699 waste material Substances 0.000 claims abstract description 13
- 238000002485 combustion reaction Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 11
- 239000000779 smoke Substances 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 8
- 239000002253 acid Substances 0.000 abstract description 6
- 230000008021 deposition Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 10
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 8
- 230000008569 process Effects 0.000 description 6
- 238000003303 reheating Methods 0.000 description 5
- 230000002378 acidificating effect Effects 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical class O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 210000003298 dental enamel Anatomy 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/02—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of bagasse, megasse or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B31/00—Modifications of boiler construction, or of tube systems, dependent on installation of combustion apparatus; Arrangements of dispositions of combustion apparatus
- F22B31/08—Installation of heat-exchange apparatus or of means in boilers for heating air supplied for combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/46—Recuperation of heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/48—Preventing corrosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2206/00—Waste heat recuperation
- F23G2206/20—Waste heat recuperation using the heat in association with another installation
-
- 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Environmental & Geological Engineering (AREA)
- Air Supply (AREA)
Abstract
The invention relates to a method and a system for inhibiting low-temperature corrosion of a boiler air preheater, wherein the boiler of the method is used for incinerating papermaking waste residues and detecting the temperatures of a high-temperature superheater, a low-temperature superheater and an air preheater pipe box; different from the prior art, the invention can change the steam soot blowing mode and frequency of the tail flue of the boiler, adopts the mode of staggered soot blowing on the left side and the right side in sequence, controls the temperature of the flue gas to be between 135 and 150 ℃, inhibits SO2 from generating acid corrosion in the low temperature of the flue gas, and simultaneously avoids the influence of the soot deposition of the tail flue on the thermal efficiency of the boiler. The device has simple structure and logic, is directly improved on the prior equipment, and has low cost.
Description
Technical Field
The invention relates to the technical field of boilers, in particular to a method and a system for inhibiting low-temperature corrosion of a boiler air preheater.
Background
The tail heating surface and the air-smoke exchange air preheater of the existing waste incineration boiler are influenced by boiler load and low tail smoke temperature, sulfur dioxide in smoke is reduced to a dewing point and is dewed and applied on a pipe row of the air preheater, and acidic corrosion is generated after a long time, the surface of the air preheater is damaged, and air leakage is caused; the air leakage of the air preheater tube can cause the reduction of the first and second hot air quantities, so as to keep the combustion air quantity, the frequency of the fan needs to be increased, the power consumption of the fan needs to be increased on the same scale, the maintenance or replacement cost of the air preheater is increased, and the safe and economic operation of the boiler is directly influenced.
The temperature of the flue gas (clean flue gas for short) purified by an absorption tower in a wet flue gas desulfurization system is generally 47 +/-5 ℃, and at the temperature, the flue gas contains saturated water vapor and acidic gas, such as SO2、SO3、NOXAnd the water vapor can generate corrosive liquid such as sulfuric acid, sulfurous acid and the like with the acid gas during condensation, and the corrosive liquid is directly discharged and has strong corrosivity on a flue and a chimney behind the absorption tower. In order to solve the problem, the common method at present is that the GGH is set to heat the clean flue gas to about 82 ℃ by using high-temperature raw flue gas, so that the requirements of the electric power industry standard DL/T5196-2004 technical code for flue gas desulfurization design of thermal power plants are met, a large amount of acidic condensate is inhibited, and the corrosion degree of the downstream equipment of the absorption tower is reduced.
More information about the above solution can also be found in the following documents:
the invention discloses a system and a process method for reducing the temperature of boiler exhaust gas and inhibiting low-temperature corrosion of an air preheater in Chinese invention patent with the patent publication number of CN109945227A, and relates to the field of comprehensive optimization of auxiliary systems of power station boilers, the system comprises a branch air supply system communicated with a main flue gas cooling system, wherein the branch air supply system comprises a branch air feeder, an air blowing port of the branch air feeder is communicated with the other inlet of a heat exchanger through a branch cold secondary air duct, and the other outlet of the heat exchanger is communicated with the main flue gas cooling system through a branch hot secondary air duct; the branch air feeder is communicated with the branch air feeder inlet air box through a branch air feeder inlet air channel. The device comprises a cold secondary reheating air duct communicated between a branch hot secondary air duct and a secondary air system. The branch reheating air duct is communicated between a cold secondary reheating air duct and a branch air feeder inlet air duct of a branch air supply system. The device comprises a primary air reheating air duct communicated between a branch reheating air duct and a primary air system. The invention solves the problems of high exhaust gas temperature of the boiler, low-temperature corrosion of the air preheater and low boiler efficiency.
In the chinese utility model patent with patent publication No. CN202361394U, a composite phase change heat exchanger for boiler flue gas waste heat recovery is disclosed, which comprises the original equipment inside and outside the flue of the boiler, its connecting pipes, and control instrument valves, wherein one or more I-level composite phase change heat exchangers, one or more II-level composite phase change heat exchangers, and a mixing chamber are arranged in the flue; and a matching temperature adjusting system and an automatic control device which are arranged outside the flue. The utility model discloses with the help of the phase transition working medium between heat exchange tube and the cover pipe in the compound phase transition heat exchanger, realized the complex of evaporimeter and condenser in an equipment, realized having practiced thrift a large amount of desulfurization water to the high-efficient recovery of flue gas waste heat, alleviateed the low temperature corrosion of flue gas. Meanwhile, hot air heated by the air preheater is divided into a part to be mixed with desulfurized clean flue gas in the mixing chamber for heating, and the mixture is discharged into the atmosphere after meeting the flue gas emission requirement, so that the low-temperature corrosion of a clean flue gas heater behind a wet desulfurization tower at present is fundamentally avoided, and the harm of the flue gas to the environment is reduced.
In the process of implementing the invention, the inventor finds that the following problems exist in the prior art:
in the prior art, the system and the process method for inhibiting the low-temperature corrosion of the air preheater have the advantages of complex logic, high error probability, need of additionally arranging a plurality of devices and high cost.
Disclosure of Invention
Therefore, a method and a system for inhibiting low-temperature corrosion of an air preheater of a boiler are needed to be provided, and the method and the system are used for the system and the process method for inhibiting low-temperature corrosion of the air preheater in the prior art, and have the technical problems of complex logic, easy error, need to add a plurality of devices and high cost.
In order to achieve the above purpose, the inventor provides a method for inhibiting low-temperature corrosion of an air preheater of a boiler, wherein the boiler is used for incinerating papermaking waste residues, the papermaking waste residues are put into a combustion chamber for combustion, the combusted waste residues enter a material returning device through the upper part of the combustion chamber, the material returning device returns part of the waste residues to the combustion chamber, and the remaining flue gas sequentially passes through a high-temperature superheater, a low-temperature superheater and an air preheater pipe box and is finally discharged into the air;
detecting the temperatures of a high-temperature superheater, a low-temperature superheater and an air preheater channel box, wherein a first left soot blower and a first right soot blower are respectively arranged on two sides of an outlet of the high-temperature superheater, a second left soot blower and a second right soot blower are respectively arranged on two sides of an outlet of the low-temperature superheater, and a third left soot blower and a third right soot blower are respectively arranged on two sides of the middle part of the air preheater channel box;
when the temperature of the high-temperature superheater is detected to be lower than a preset value, starting a first left soot blower and a first right soot blower, and sequentially blowing soot on the flue gas at the outlet of the high-temperature superheater in a staggered manner from left to right;
when the temperature of the low-temperature superheater is detected to be lower than a preset value, a second left soot blower and a second right soot blower are started, and soot blowing is performed on flue gas at an outlet of the low-temperature superheater in a staggered mode left and right;
when the temperature of the air preheater pipe box is detected to be lower than a preset value, a third left soot blower and a third right soot blower are started, and soot blowing is performed on smoke in the middle of the air preheater pipe box in a staggered mode left and right;
thereby controlling the flue gas temperature of the air preheater channel within a preset range.
Different from the prior art, the technical scheme is that the temperatures of a high-temperature superheater, a low-temperature superheater and an air preheater tube box are detected, a first left soot blower and a second right soot blower are respectively arranged on two sides of an outlet of the high-temperature superheater, a second left soot blower and a second right soot blower are respectively arranged on two sides of an outlet of the low-temperature superheater, and a third left soot blower and a third right soot blower are respectively arranged on two sides of the middle part of the air preheater tube box; the method can change the steam soot blowing mode and frequency of the tail flue of the boiler, adopt the mode of staggered soot blowing on the left side and the right side in sequence, control the temperature of the flue gas to be between 135 ℃ and 150 ℃, and inhibit SO in the low temperature of the flue gas2Acid corrosion is generated, and meanwhile, the influence of dust deposition of a tail flue on the thermal efficiency of the boiler is avoided. The device has simple structure and logic, is directly improved on the prior equipment, and has low cost.
As an embodiment of the invention, the temperature of the steam in the high-temperature superheater is detected, when the temperature of the flue gas is higher than the temperature of the steam in the high-temperature superheater, the flue gas transfers heat to the steam in the high-temperature superheater, and when the temperature of the steam in the high-temperature superheater is lower than a preset value, the temperature of the steam is increased.
So, in order to guarantee the temperature of flue gas in the high temperature over heater, when the temperature of the steam in the high temperature over heater is less than the default, improve the temperature of steam, increase high temperature heater extraction steam pressure and temperature to improve the feedwater temperature and adjust boiler exhaust gas temperature in higher control range.
As an embodiment of the invention, the temperature of the steam in the low-temperature superheater is detected, when the temperature of the flue gas is higher than the temperature of the steam in the low-temperature superheater, the flue gas transfers heat to the steam in the low-temperature superheater, and when the temperature of the steam in the low-temperature superheater is lower than a preset value, the temperature of the steam is increased.
So, in order to guarantee the temperature of flue gas in the low temperature over heater, when the temperature of the steam in the low temperature over heater is less than the default, improve the temperature of steam, increase low temperature heater extraction steam pressure and temperature to improve the feedwater temperature and adjust boiler exhaust gas temperature in higher control range.
According to one embodiment of the invention, the corrosion resistance of the material of the air preheater tube box is improved.
Therefore, the material of the air preheater is changed from original Cowden steel to an enamel sleeve, and the corrosion resistance is improved in the quality of the pipe.
As an implementation mode of the invention, after each shutdown, the air preheater channel is checked, the local corrosion of the air preheater channel is penetrated, plugging is adopted, the cold air is prevented from scouring the peripheral pipelines, and the low-temperature corrosion caused by the temperature of the surface of the pipe wall is reduced.
So, the air heater is because of the local corrosion poling, arranges to take the leaking stoppage after plan blowing out, prevents that cold air from scouring peripheral pipeline, reduces the pipe wall surface temperature and brings low temperature corrosion, improves air heater's life.
To achieve the above object, the inventors also provide a system for suppressing low-temperature corrosion of a boiler air pre-heater, which is used for implementing the method for suppressing low-temperature corrosion of the boiler air pre-heater as described in any one of the above-mentioned inventors.
Different from the prior art, the technical scheme is that the temperatures of a high-temperature superheater, a low-temperature superheater and an air preheater tube box are detected, a first left soot blower and a second right soot blower are respectively arranged on two sides of an outlet of the high-temperature superheater, a second left soot blower and a second right soot blower are respectively arranged on two sides of an outlet of the low-temperature superheater, and a third left soot blower and a third right soot blower are respectively arranged on two sides of the middle part of the air preheater tube box; the method can change the steam soot blowing mode and frequency of the tail flue of the boiler, adopt the mode of staggered soot blowing on the left side and the right side in sequence, control the exhaust gas temperature to be between 135 ℃ and 150 ℃, inhibit SO2 from generating acid corrosion in the low temperature of the exhaust gas, and simultaneously avoid the influence of the soot deposition of the tail flue on the thermal efficiency of the boiler. The device has simple structure and logic, is directly improved on the prior equipment, and has low cost.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for a person skilled in the art to obtain other drawings based on the drawings without any creative effort.
FIG. 1 is a system for suppressing low-temperature corrosion of a boiler air preheater according to one embodiment.
Description of reference numerals:
21. a first left soot blower is arranged at the front end of the main shaft,
22. the first right soot blower is arranged on the front side of the main body,
23. a second left soot blower is arranged on the front side of the main body,
24. a second right soot blower is arranged on the front side of the second soot blower,
25. a third left soot blower is arranged on the left side of the ash-blowing device,
26. a third right soot blower is arranged on the front side of the rear ash-blowing device,
3. the direction of the flow of the flue gas,
4. a high-temperature superheater is arranged on the upper portion of the furnace,
5. a low-temperature superheater is arranged on the lower portion of the furnace,
6. an air preheater channel box is arranged on the air preheater,
7. a combustion chamber.
Detailed Description
To explain technical contents, structural features, and objects and effects of the technical solutions in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described with reference to the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
The tail heating surface and the air-smoke exchange air preheater of the existing waste incineration boiler are influenced by boiler load and low tail smoke temperature, sulfur dioxide in smoke is reduced to a dewing point and is dewed and applied on a pipe row of the air preheater, and acidic corrosion is generated after a long time, the surface of the air preheater is damaged, and air leakage is caused; the air leakage of the air preheater tube can cause the reduction of the first and second hot air quantities, so as to keep the combustion air quantity, the frequency of the fan needs to be increased, the power consumption of the fan needs to be increased on the same scale, the maintenance or replacement cost of the air preheater is increased, and the safe and economic operation of the boiler is directly influenced.
In the prior art, the system and the process method for inhibiting the low-temperature corrosion of the air preheater have the advantages of complex logic, high error probability, need of additionally arranging a plurality of devices and high cost.
Referring to fig. 1, the embodiment relates to a method for inhibiting low-temperature corrosion of an air preheater of a boiler, the boiler is used for incinerating papermaking waste residues, the papermaking waste residues are put into a combustion chamber 7 for combustion, the combusted waste residues enter a return feeder through the upper part of the combustion chamber 7, the return feeder returns part of the waste residues to the combustion chamber 7, and the remaining flue gas passes through a high-temperature superheater 4, a low-temperature superheater 5 and an air preheater pipe box 6 in sequence and is finally discharged into the air;
the method comprises the steps of detecting the temperatures of a high-temperature superheater 4, a low-temperature superheater 5 and an air preheater channel 6, respectively arranging a first left soot blower 21 and a first right soot blower 22 on two sides of an outlet of the high-temperature superheater 4, respectively arranging a second left soot blower 23 and a second right soot blower 24 on two sides of an outlet of the low-temperature superheater 5, and respectively arranging a third left soot blower 25 and a third right soot blower 26 on two sides of the middle part of the air preheater channel 6;
when the temperature of the high-temperature superheater 4 is detected to be lower than a preset value, starting a first left soot blower 21 and a first right soot blower 22, and performing soot blowing on the flue gas at the outlet of the high-temperature superheater 4 in a staggered manner;
when the temperature of the low-temperature superheater 5 is detected to be lower than a preset value, a second left soot blower 23 and a second right soot blower 24 are started, and soot blowing is performed on flue gas at an outlet of the low-temperature superheater 5 in a staggered mode;
when the temperature of the air preheater pipe box 6 is detected to be lower than a preset value, a third left soot blower 25 and a third right soot blower 26 are started, and soot blowing is sequentially performed on the flue gas in the middle of the air preheater pipe box 6 in a staggered mode from left to right;
thereby controlling the temperature of the flue gas of the air preheater channel 6 within a preset range. In the embodiment, the temperature of the discharged smoke is mainly controlled to be 135-150 ℃, the discharged smoke is easily condensed when the temperature is too low, and energy is wasted when the temperature is too high.
Different from the prior art, the technical scheme is that the temperatures of the high-temperature superheater 4, the low-temperature superheater 5 and the air preheater channel 6 are detected, a first left soot blower 21 and a second right soot blower 24 are respectively arranged on two sides of an outlet of the high-temperature superheater 4, a second left soot blower 23 and a second right soot blower 24 are respectively arranged on two sides of an outlet of the low-temperature superheater 5, and a third left soot blower 25 and a third right soot blower 26 are respectively arranged on two sides of the middle part of the air preheater channel 6; the method can change the steam soot blowing mode and frequency of the tail flue of the boiler, adopt the mode of staggered soot blowing on the left side and the right side in sequence, control the temperature of the flue gas to be between 135 ℃ and 150 ℃, and inhibit SO in the low temperature of the flue gas2Acid corrosion is generated, and meanwhile, the influence of dust deposition of a tail flue on the thermal efficiency of the boiler is avoided. The device has simple structure and logic, is directly improved on the prior equipment, and has low cost.
In some embodiments, the temperature of the steam in the high-temperature superheater 4 is detected, when the temperature of the flue gas is higher than the temperature of the steam in the high-temperature superheater 4, the flue gas transfers heat to the steam in the high-temperature superheater 4, and when the temperature of the steam in the high-temperature superheater 4 is lower than a preset value, the temperature of the steam is increased.
The preset value at this time was 135 ℃.
So, in order to guarantee the temperature of flue gas in the high temperature over heater 4, when the temperature of the steam in the high temperature over heater 4 is less than the default, improve the temperature of steam, increase high temperature heater extraction steam pressure and temperature to improve the feedwater temperature and adjust boiler exhaust gas temperature in higher control range.
In some embodiments, the temperature of the steam in the low-temperature superheater 5 is detected, when the temperature of the flue gas is higher than the temperature of the steam in the low-temperature superheater 5, the flue gas transfers heat to the steam in the low-temperature superheater 5, and when the temperature of the steam in the low-temperature superheater 5 is lower than a preset value, the temperature of the steam is increased.
The preset value at this time was 135 ℃.
So, in order to guarantee the temperature of flue gas in the low temperature over heater 5, when the temperature of the steam in the low temperature over heater 5 is less than the default, improve the temperature of steam, increase low temperature heater extraction steam pressure and temperature to improve the feedwater temperature and adjust boiler exhaust gas temperature in higher control range.
In some embodiments, the air preheater tube box 6 is made of a material that is resistant to corrosion. Therefore, the material of the air preheater is changed from original Cowden steel to an enamel sleeve, and the corrosion resistance is improved in the quality of the pipe.
In some embodiments, after each shutdown, the air preheater tube box 6 is inspected, and the air preheater tube box 6 is partially corroded and penetrated, so that leakage stoppage is adopted, cold air is prevented from washing peripheral pipelines, and low-temperature corrosion caused by reducing the temperature of the surface of the tube wall is avoided. So, the air heater is because of the local corrosion poling, arranges to take the leaking stoppage after plan blowing out, prevents that cold air from scouring peripheral pipeline, reduces the pipe wall surface temperature and brings low temperature corrosion, improves air heater's life.
The embodiment also relates to a system for inhibiting the low-temperature corrosion of the boiler air preheater, which is used for executing the method for inhibiting the low-temperature corrosion of the boiler air preheater.
Specifically, referring to fig. 1, the flue gas flows in the direction 3 from the combustion chamber 7 into the material returning device, and then flows into the high temperature superheater 4, the low temperature superheater 5, and the air preheater pipe box 6 from the top of the material returning device, and finally flows out. A first left soot blower 21 and a first right soot blower 22 are respectively arranged on two sides of an outlet of the high-temperature superheater 4, a second left soot blower 23 and a second right soot blower 24 are respectively arranged on two sides of an outlet of the low-temperature superheater 5, and a third left soot blower 25 and a third right soot blower 26 are respectively arranged on two sides of the middle part of the air preheater tube box 6. The problem of low temperature corrosion of the air preheater channel box 6 is mainly solved in this embodiment, and the temperature of the flue gas needs to be increased.
In the embodiment, by detecting the temperatures of the high-temperature superheater 4, the low-temperature superheater 5 and the air preheater channel 6, a first left soot blower 21 and a second right soot blower 24 are respectively arranged on two sides of an outlet of the high-temperature superheater 4, a second left soot blower 23 and a second right soot blower 24 are respectively arranged on two sides of an outlet of the low-temperature superheater 5, and a third left soot blower 25 and a third right soot blower 26 are respectively arranged on two sides of the middle part of the air preheater channel 6; the method can change the steam soot blowing mode and frequency of the tail flue of the boiler, adopt the mode of staggered soot blowing on the left side and the right side in sequence, control the temperature of the flue gas to be between 135 ℃ and 150 ℃, and inhibit SO in the low temperature of the flue gas2Acid corrosion is generated, and meanwhile, the influence of dust deposition of a tail flue on the thermal efficiency of the boiler is avoided. The device has simple structure and logic, is directly improved on the prior equipment, and has low cost.
It should be noted that, although the above embodiments have been described herein, the invention is not limited thereto. Therefore, based on the innovative concepts of the present invention, the technical solutions of the present invention can be directly or indirectly applied to other related technical fields by making changes and modifications to the embodiments described herein, or by using equivalent structures or equivalent processes performed in the content of the present specification and the attached drawings, which are included in the scope of the present invention.
Claims (6)
1. A method for inhibiting low-temperature corrosion of a boiler air preheater is characterized in that a boiler is used for incinerating papermaking waste residues, the papermaking waste residues are placed into a combustion chamber for combustion, the combusted waste residues enter a material returning device through the upper part of the combustion chamber, the material returning device returns part of the waste residues to the combustion chamber, and the remaining smoke passes through a high-temperature superheater, a low-temperature superheater and an air preheater pipe box in sequence and is finally discharged into the air;
detecting the temperatures of a high-temperature superheater, a low-temperature superheater and an air preheater channel box, wherein a first left soot blower and a first right soot blower are respectively arranged on two sides of an outlet of the high-temperature superheater, a second left soot blower and a second right soot blower are respectively arranged on two sides of an outlet of the low-temperature superheater, and a third left soot blower and a third right soot blower are respectively arranged on two sides of the middle part of the air preheater channel box;
when the temperature of the high-temperature superheater is detected to be lower than a preset value, starting a first left soot blower and a first right soot blower, and sequentially blowing soot on the flue gas at the outlet of the high-temperature superheater in a staggered manner from left to right;
when the temperature of the low-temperature superheater is detected to be lower than a preset value, a second left soot blower and a second right soot blower are started, and soot blowing is performed on flue gas at an outlet of the low-temperature superheater in a staggered mode left and right;
when the temperature of the air preheater pipe box is detected to be lower than a preset value, a third left soot blower and a third right soot blower are started, and soot blowing is performed on smoke in the middle of the air preheater pipe box in a staggered mode left and right;
thereby controlling the flue gas temperature of the air preheater channel within a preset range.
2. The method for inhibiting the low-temperature corrosion of the boiler air preheater as recited in claim 1, wherein the temperature of the steam in the high-temperature superheater is detected, when the temperature of the flue gas is higher than the temperature of the steam in the high-temperature superheater, the flue gas transfers heat to the steam in the high-temperature superheater, and when the temperature of the steam in the high-temperature superheater is lower than a preset value, the temperature of the steam is increased.
3. The method for inhibiting the low-temperature corrosion of the boiler air preheater as recited in claim 1, wherein the temperature of the steam in the low-temperature superheater is detected, the flue gas transfers heat to the steam in the low-temperature superheater when the temperature of the flue gas is higher than the temperature of the steam in the low-temperature superheater, and the temperature of the steam is increased when the temperature of the steam in the low-temperature superheater is lower than a preset value.
4. The method for suppressing the low-temperature corrosion of the air preheater of the boiler as recited in claim 1, wherein the corrosion resistance of the material of the tube box of the air preheater is improved.
5. The method for inhibiting the low-temperature corrosion of the air preheater of the boiler as recited in claim 1, wherein after each shutdown, the air preheater tube box is inspected, and the tube penetrates through the air preheater tube box due to local corrosion, so as to block leakage, prevent cold air from washing peripheral pipelines and reduce the low-temperature corrosion caused by the temperature of the surface of the tube wall.
6. A system for suppressing low-temperature corrosion of a boiler air pre-heater, which is used for implementing the method for suppressing low-temperature corrosion of the boiler air pre-heater according to any one of claims 1 to 5.
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| CN109556129A (en) * | 2019-02-12 | 2019-04-02 | 北控清洁热力有限公司 | A kind of heating pulverized-coal fired boiler soot blower system |
| CN109631030A (en) * | 2019-02-22 | 2019-04-16 | 北控清洁热力有限公司 | A kind of soot blower system of heating pulverized-coal fired boiler |
| CN112664953A (en) * | 2019-12-23 | 2021-04-16 | 无锡华光锅炉股份有限公司 | Circulating fluidized bed incineration boiler for burning solid waste |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101852438A (en) * | 2010-06-23 | 2010-10-06 | 伟明环保设备有限公司 | Waste incineration boiler |
| CN205227269U (en) * | 2015-11-20 | 2016-05-11 | 西安华江环保科技股份有限公司 | Take dry coke quenching boiler of soot blower |
| CN106996577A (en) * | 2017-05-09 | 2017-08-01 | 西安热工研究院有限公司 | A kind of block-resistant type air preheater step-by-step arrangement system |
| CN109556129A (en) * | 2019-02-12 | 2019-04-02 | 北控清洁热力有限公司 | A kind of heating pulverized-coal fired boiler soot blower system |
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Application publication date: 20211029 |