CN212691723U - Power plant boiler water wall anticorrosion is air preheater jam treatment system in coordination - Google Patents
Power plant boiler water wall anticorrosion is air preheater jam treatment system in coordination Download PDFInfo
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- CN212691723U CN212691723U CN202022265346.8U CN202022265346U CN212691723U CN 212691723 U CN212691723 U CN 212691723U CN 202022265346 U CN202022265346 U CN 202022265346U CN 212691723 U CN212691723 U CN 212691723U
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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 discloses a power plant boiler water-cooling wall is anticorrosive in coordination with air preheater blocks up treatment system, including air heater, air heater includes that the flue gas divides the storehouse, the wind divides the storehouse once, the secondary air divides the storehouse, it divides the storehouse to wash the wind, air heater's left end is equipped with the air preheater and prevents stifled system, the air preheater prevents stifled system and includes the wind pipeline once, the secondary air pipeline, wash the wind and divide the storehouse pipeline, the left side of washing the wind and divide the storehouse pipeline is equipped with the washing wind bypass, it has first pipeline to wash the upper end of wind branch storehouse pipeline and the upper end intercommunication of washing the wind bypass, the left end level of first pipeline stretches out the female pipe of intercommunication adherence wind, the lower extreme that washs the wind branch storehouse pipeline has the second pipeline with the lower extreme intercommunication of wasing the wind bypass, and wash the wind pipeline of. The utility model provides high abluent effect, realized that the boiler is energy-conserving and reduce the station service power consumption.
Description
Technical Field
The utility model relates to an environmental protection power generation technical field, more specifically relate to a power plant water-cooling wall is anticorrosive in coordination with air preheater jam treatment system.
Background
In recent years, with the increasing of the national environmental protection requirement, the coal-fired power plants are basically provided with SCR systems for removing NOx generated by coal-fired so as to meet the requirement of the environmental protection standard on the NOx emission concentration. The process of removing NOx by the SCR system needs to inject a large amount of NH according to the amount of NOx generated by a boiler3Part of NH, subject to field conditions3Fails to completely participate in the reaction and causes ammonia escape at a certain concentration; in addition, the catalyst in the SCR system can be used for treating SO in the flue gas2By oxidation to SO3Has a certain catalytic action to cause 0.3-2% of SO in the SCR reactor2Is oxidized into SO3. High-temperature flue gas enters a downstream air preheater after being reacted by an SCR system to perform primary hot air and secondary hot air heat exchange (the temperature of the flue gas at the inlet of the common air preheater is 350-400 ℃), and after the heat exchange of the whole flow of the air preheater, the average temperature of the flue gas at the cold end outlet of the air preheater is generally reduced to 130-160 ℃, and the SO in the flue gas in the period3Condensation occurs to cause the corrosion of the heat storage element at the cold end of the air preheater, and simultaneously, SO in the flue gas3And NH3Reaction to form strongly viscous NH4HSO4，NH4HSO4The fly ash in the flue gas is easy to adhere to the surface of the heat exchange fins of the air preheater due to high viscosity, so that the pressure difference between the inlet and the outlet of the air preheater is gradually increased, the blockage is gradually increased, and the output of a unit is finally influenced.
At present, the coal-fired boilers of power stations all adopt the low-nitrogen combustion technology of coal, but under the condition of low-nitrogen combustion, the main combustion areaThe method belongs to the environment of oxygen-deficient combustion, the combustion area of a water-cooled wall is in a reducing atmosphere, and the phenomenon of blending and burning high-sulfur coal is common in the domestic coal-fired boiler at present in order to reduce the coal-fired cost. Therefore, a large amount of corrosive gas (mainly H in reducing atmosphere) exists at the position close to the water wall2S gas) causing severe high temperature corrosion problems of boiler water walls.
Aiming at the problem of high-temperature corrosion of the water wall, a power plant usually adopts a high-temperature anticorrosive spraying material for anticorrosive spraying and water wall adherent wind protection, but the service life of the anticorrosive spraying material of the boiler is shortened and the maintenance cost is increased along with deviation of the coal type for burning the boiler from a design value and increase of the co-combustion strength of high-sulfur coal; the traditional adherent wind design adopts the secondary hot air as adherent wind for water-cooled wall protection, but the secondary hot air has low wind pressure and even has negative value, so that the water-cooled wall protection effect is poor.
Aiming at the problem of blockage of the air preheater, the power plant usually adopts a mode of increasing steam soot blowing frequency or putting a fan heater in use all the year round and the like to relieve the blockage, and when the blockage is serious, the power plant needs to be stopped and washed by high-pressure water, the method increases coal consumption, influences the economy of a unit, and on the other hand, the blockage problem cannot be fundamentally solved and influences the load rate of the unit.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve provides a power plant boiler water wall is anticorrosive in coordination with air preheater blocks up treatment system to solve the water-cooling wall and be corroded easily, the easy problem of blockking up of air preheater, in order to realize carrying on the air preheater when less hot-blast to prevent blocking up sweep and the subsides of water-cooling wall keep away the wind protection.
In order to solve the technical problem, the utility model adopts the following technical proposal.
An anticorrosion and air preheater blockage treatment system for a boiler water-cooled wall of a power plant comprises an air preheater which is arranged at the tail end of a boiler and used for preheating air before entering the boiler, wherein the air preheater comprises a smoke sub-bin, a primary air sub-bin and a secondary air sub-bin; a third isolating door is arranged at the upper part of the cleaning air distribution pipeline; a cleaning air bypass communicated with the cleaning air branch bin pipeline is arranged on the left side of the cleaning air branch bin pipeline, a first pipeline is communicated between the upper end of the cleaning air branch bin pipeline and the upper end of the cleaning air bypass, and the left end of the first pipeline horizontally extends out to be communicated with a wall-adhering air main pipe attached to the wall of the boiler; the lower end of the cleaning air sub-bin pipeline is communicated with the lower end of the cleaning air bypass; the upper part of the cleaning air bypass is provided with a first isolation door, and the cleaning air bypass is communicated with the primary air pipeline through a third pipeline provided with a second isolation door.
According to the technical scheme, the fan-shaped angle of the fan-shaped air injection port of the smoke sub-bin is 90 degrees, and the fan-shaped angle of the fan-shaped air injection port of the primary air sub-bin is smaller than that of the fan-shaped air injection port of the secondary air sub-bin.
Further optimizing the technical scheme, the fan-shaped angle of the fan-shaped air injection port of the cleaning air sub-bin is 2-4 degrees.
Due to the adoption of the technical scheme, the utility model has the following technical progress.
The utility model discloses in introduce the position in hot-blast washing branch storehouse between secondary wind branch storehouse and primary wind branch storehouse, avoided because the higher problem that leads to washing branch storehouse to flue gas side leakage of primary hot air static pressure has also reduced entire system and has leaked out. The utility model discloses prevent stifled system and water-cooling wall adherence wind system with the air preheater and establish ties, realized that a small amount of once hot-blast carry on simultaneously that the air preheater prevents blocking up sweep and the subsides of water-cooling wall keep away the wind protection, prevent to exert oneself not enough problem because of hot-blast cleaning system and once wind adherence wind transform the primary air fan that leads to, improved abluent effect, realized that the boiler is energy-conserving and reduce the station service power consumption.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of an air preheater according to the present invention;
wherein: 1. boiler, 2, air heater, 21, flue gas branch storehouse, 22, wash wind branch storehouse, 23, wind branch storehouse, 24, overgrate air branch storehouse, 3, the wind pipeline of once, 4, overgrate air pipeline, 5, wash wind branch storehouse pipeline, 6, wash the wind bypass, 7, the female pipe of adherence wind, 8, first dodge gate, 9, second dodge gate, 10, third dodge gate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model provides a power plant boiler water-cooling wall anticorrosion is with air preheater jam treatment system, combines shown in fig. 1 to 2, includes boiler, air heater, primary air pipeline, overgrate air pipeline, washs the branch storehouse pipeline of wind, washs the wind bypass, adheres to the wall wind main pipe.
The air preheater is arranged at the tail end of the boiler and preheats air entering the boiler, so that the heat exchange performance of the boiler is improved, and the energy consumption is reduced. The air preheater comprises a smoke sub-bin, a primary air sub-bin and a secondary air sub-bin, and a cleaning air sub-bin is arranged between the primary air sub-bin and the secondary air sub-bin. The fan-shaped angle of the fan-shaped air injection port of the smoke sub-bin is 90 degrees; the fan-shaped angle of the fan-shaped air injection port of the primary air sub-bin is smaller than that of the fan-shaped air injection port of the secondary air sub-bin, the primary air pressure is higher than the secondary air inlet pressure, the pressure difference is used as a power source, and a booster fan is not needed; the fan-shaped angle of the fan-shaped air injection port of the cleaning air sub-bin is 2-4 degrees.
The left end of the air preheater is provided with an air preheater anti-blocking system, and the air preheater anti-blocking system comprises a primary air pipeline, a secondary air pipeline and a cleaning air warehouse-dividing pipeline. The primary air pipeline is communicated with the primary air sub-bin, the secondary air pipeline is communicated with the secondary air sub-bin, the cleaning air sub-bin pipeline is communicated with the cleaning air sub-bin, and the cleaning air sub-bin pipeline is arranged between the primary air pipeline and the secondary air pipeline. The upper portion of washing wind branch storehouse pipeline is equipped with the third insulated door, and the left side of washing wind branch storehouse pipeline is equipped with the washing wind bypass, and the washing wind bypass is divided the storehouse pipeline with the washing wind and is communicate. The upper end of the cleaning air branch pipeline is communicated with the upper end of the cleaning air bypass, and the left end of the first pipeline horizontally extends out to be communicated with an adherence air main pipe attached to the wall of the boiler; and the lower end of the cleaning air sub-bin pipeline is communicated with the lower end of the cleaning air bypass. The upper portion of washing wind bypass is equipped with first insulated door, and washs wind bypass intercommunication primary air pipeline, washs wind bypass and primary air pipeline and communicates through the third pipeline that is equipped with the second insulated door.
The utility model discloses when the boiler stage of igniteing, if denitration entry flue gas temperature value TSCR inletIf the temperature is less than 320 ℃, closing the second isolation door and the third isolation door, and opening the first isolation door; the SCR denitration system is not put into, the air preheater anti-blocking system does not need to be put into, and primary hot air required by the system enters the wall-attached air main pipe through a bypass to protect the heating surface of the water-cooled wall. Monitoring flue gas inlet temperature value T of SCR denitration system after unit is started and operated in a grid-connected modeSCR inlet(ii) a And controlling the air quantity of the primary air pipeline to be 5-10 t/h. When the temperature value T of the flue gas inletSCR inlet>When the temperature is 320 ℃, closing the first isolation door and opening the third isolation door; and (4) putting the SCR denitration system into operation, putting the hot air cleaning system into operation, and exiting the bypass.
The utility model discloses it is hot-blast to extract on the primary air pipeline of air heater export, gets into the washing wind branch storehouse of cold junction heating overgrate air side low temperature zone, improves the fluidic temperature of washing branch storehouse to ammonium bisulfate dewfall temperature (according to 207 ℃) more than, makes ammonium bisulfate turn into the gaseous state by the liquid rapidly in this region, utilizes fluidic high-velocity of flow simultaneously, can make the flying dust not have the adhesion basis and take away along with hot-blast. Because the pressure of the hot primary air at the outlet of the air preheater is higher than the pressure of the cold secondary air inlet, the pressure difference is used as a power source, and a booster fan is not needed. After cleaning hot air finishes purging of the air preheater, the end pipeline extending out of the left end of the first pipeline enters the wall-attached air main pipe to serve as wall-attached air to form an air film near the water-cooled wall, and high-temperature corrosion of the water-cooled wall is prevented.
The utility model provides a power plant boiler water-cooling wall is anticorrosive in coordination with air preheater blocks up treatment system, adopt the water-cooling wall is anticorrosive in coordination with air preheater and prevent stifled method of going on simultaneously, can solve because of the low adherent wind rigidity that leads to of overgrate air wind pressure is not enough, the water-cooling wall that further leads to is anticorrosive not good problem of effect, can solve simultaneously because of adherent wind transformation and air preheater prevent stifled transformation and go on simultaneously the not enough problem of once fan that leads to of exerting oneself, the abluent effect has been improved, boiler energy saving and service power consumption reduction have been realized.
Claims (3)
1. Anticorrosive air preheater in coordination of power plant boiler water-cooling wall blocks up treatment system, including setting up at the tail end of boiler, being used for the air heater who preheats the air before the boiler that will get into, air heater includes that the flue gas divides storehouse, primary air branch storehouse, overgrate air branch storehouse, its characterized in that: a cleaning air sub-bin is arranged between the primary air sub-bin and the secondary air sub-bin, an air preheater anti-blocking system is arranged at the left end of the air preheater, the air preheater anti-blocking system comprises a primary air pipeline communicated with the primary air sub-bin and a secondary air pipeline communicated with the secondary air sub-bin, and a cleaning air sub-bin pipeline communicated with the cleaning air sub-bin is arranged between the primary air pipeline and the secondary air pipeline; a third isolating door is arranged at the upper part of the cleaning air distribution pipeline; a cleaning air bypass communicated with the cleaning air branch bin pipeline is arranged on the left side of the cleaning air branch bin pipeline, a first pipeline is communicated between the upper end of the cleaning air branch bin pipeline and the upper end of the cleaning air bypass, and the left end of the first pipeline horizontally extends out to be communicated with a wall-adhering air main pipe attached to the wall of the boiler; the lower end of the cleaning air sub-bin pipeline is communicated with the lower end of the cleaning air bypass; the upper part of the cleaning air bypass is provided with a first isolation door, and the cleaning air bypass is communicated with the primary air pipeline through a third pipeline provided with a second isolation door.
2. The power plant boiler water wall corrosion prevention and air preheater blockage management system as recited in claim 1, wherein: the fan-shaped angle of the fan-shaped air injection port of the smoke sub-bin is 90 degrees, and the fan-shaped angle of the fan-shaped air injection port of the primary air sub-bin is smaller than that of the fan-shaped air injection port of the secondary air sub-bin.
3. The power plant boiler water wall corrosion prevention and air preheater blockage management system as recited in claim 1, wherein: the fan-shaped angle of the fan-shaped air injection port of the cleaning air distribution bin is 2-4 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022265346.8U CN212691723U (en) | 2020-10-13 | 2020-10-13 | Power plant boiler water wall anticorrosion is air preheater jam treatment system in coordination |
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| CN202022265346.8U CN212691723U (en) | 2020-10-13 | 2020-10-13 | Power plant boiler water wall anticorrosion is air preheater jam treatment system in coordination |
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| CN212691723U true CN212691723U (en) | 2021-03-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066357A (en) * | 2020-10-13 | 2020-12-11 | 河北冀研能源科学技术研究院有限公司 | Power plant boiler water wall anticorrosion collaborative air preheater blockage treatment system and method |
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- 2020-10-13 CN CN202022265346.8U patent/CN212691723U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112066357A (en) * | 2020-10-13 | 2020-12-11 | 河北冀研能源科学技术研究院有限公司 | Power plant boiler water wall anticorrosion collaborative air preheater blockage treatment system and method |
| CN112066357B (en) * | 2020-10-13 | 2024-07-26 | 河北建投能源科学技术研究院有限公司 | System and method for controlling blockage of water-cooled wall anticorrosion cooperative air preheater of power plant boiler |
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Address after: 050000 2nd floor, Yingpan commercial and residential building, 129 Nanxiao street, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee after: Hebei Jiantou energy science and Technology Research Institute Co.,Ltd. Address before: 050000 2nd floor, Yingpan commercial and residential building, 129 Nanxiao street, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee before: HEBEI JI-YAN ENERGY SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |
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