CN112161512A - Device that rotation air preheater blockked up comprehensive control - Google Patents
Device that rotation air preheater blockked up comprehensive control Download PDFInfo
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- CN112161512A CN112161512A CN202010832483.7A CN202010832483A CN112161512A CN 112161512 A CN112161512 A CN 112161512A CN 202010832483 A CN202010832483 A CN 202010832483A CN 112161512 A CN112161512 A CN 112161512A
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- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G13/00—Appliances or processes not covered by groups F28G1/00 - F28G11/00; Combinations of appliances or processes covered by groups F28G1/00 - F28G11/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
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Abstract
The invention discloses a device for comprehensively treating blockage of a rotary air preheater, which comprises an air preheater body, wherein a primary air side, a secondary air side and a flue gas side are arranged in the air preheater body and are separated by a fan-shaped plate, so that independent circulation channels of primary air, secondary air and flue gas are respectively formed; a circulating air sub-bin is divided from the cold end and the hot end of the air preheater body, the two ends of the circulating air sub-bin are respectively connected with a circulating flue gas outlet pipeline and a circulating flue gas inlet pipeline, the circulating flue gas outlet pipeline is connected with the inlet end of a high-temperature fan, and the outlet end of the high-temperature fan is connected with the circulating flue gas inlet pipeline. Solid alkaline absorbent grinding materials are added into the high-temperature circulating flue gas, the high-temperature circulating flue gas which is uniformly mixed and has high turbulence degree is used for continuously and circularly heating the cold-end heat storage element of the air preheater, the carried dry solid alkaline absorbent grinding materials are used for periodically washing and cleaning the dust on the heat storage element and are reacted and adsorbed with the substances condensed on the surface of the heat storage element, and the purpose of preventing and treating the blockage of the air preheater is finally achieved.
Description
Technical Field
The invention belongs to the technical field of application of boiler equipment in a thermal power plant, and particularly relates to a device for comprehensively treating blockage of a rotary air preheater.
Background
Part of SO is generated in the combustion process of a coal-fired power plant2，SO2Continuously oxidizing in the high-temperature environment in the furnace and in the SCR denitration system to generate SO3This fraction of SO3The existence of the additive is not only one of main causes of colored smoke and rain (such as blue smoke/yellow smoke) formation of the power plant, but also can be caused by water vapor and NH3Ammonium bisulfate in the flue gas is condensed and adhered with fly ash to deposit on the surface of the air preheater to form blockage, so that the air leakage rate, the exhaust gas temperature and the power consumption rate of an air-smoke system of the air preheater are increased, the load carrying capacity of a unit is limited, and the like.
Aiming at the physical properties of ammonium bisulfate, different physical states are found according to different temperatures, a solid state is shown below 147 ℃, a viscous state is shown in the range of 147-250 ℃, and the ammonium bisulfate is difficult to remove by a conventional soot blowing method. The phase change process of the ammonium bisulfate is reversible, the blockage condition of the air preheater is mainly concentrated at the part below 350mm of the cold-end heat storage element, and the blockage is hard, so the cold-end heat storage element of the air preheater can be heated to reach the temperature of more than 250 ℃ by means of circulating air modification, air heaters and the like.
Circulating air ash blocking prevention modification technology aiming at ash blocking mechanism of air preheaterThe solution comprises two aspects. On one hand, the lowest temperature of the cold end of the air preheater is increased, and low-temperature corrosion is reduced; on the other hand, the ash adhered to the heat storage element is cleaned in time, so that the situation that the ash is blocked due to excessive accumulation of the ash is prevented from being difficult to treat. The patent technology CN 108534172A thoroughly removes the deposit by using a steam soot blower after the deposit becomes loose by reacting NaOH solution with ammonium bisulfate in the deposit and gasifying the residual ammonium bisulfate by combining high-temperature and high-speed secondary air. However, the NaOH solution and the steam content are introduced into the secondary air, which may have a certain influence on the normal operation of the boiler denitration system. Patent technology CN 105605604A adds ash abrasive material on the ash conveying pipe of the coal economizer in the circulating air pipe, utilizes the circulating air to carry the abrasive material to pass through the heat storage element to regularly clean the accumulated ash on the heat storage element, solves the problem of ash accumulation blockage of the air preheater, however, the ash abrasive material has complex components and is used for SO in the flue gas3Or the absorption effect of the ammonium bisulfate is poorer than that of a pure alkaline absorbent, and the circulating flue is shorter, SO that the grinding materials are unevenly distributed in the flue gas flow, and the SO of the grinding materials on the flue gas is reduced3Or the absorption effect of ammonium bisulfate and the scouring effect of the foulants.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a device for comprehensively treating blockage of a rotary air preheater.
The technical scheme adopted by the invention for solving the problems is as follows: a device for comprehensively treating blockage of a rotary air preheater comprises an air preheater body and is characterized in that a primary air side, a secondary air side and a flue gas side are arranged in the air preheater body and are separated by a fan-shaped plate to respectively form independent circulation channels of primary air, secondary air and flue gas; the air preheater comprises an air preheater body, and is characterized in that a circulating air sub-bin is divided from a cold end and a hot end of the air preheater body, two ends of the circulating air sub-bin are respectively connected with a circulating flue gas outlet pipeline and a circulating flue gas inlet pipeline, the circulating flue gas outlet pipeline is connected with an inlet end of a high-temperature fan, an outlet end of the high-temperature fan is connected with the circulating flue gas inlet pipeline, and an inlet and an outlet of the high-temperature fan are respectively provided with a fan inlet valve and a fan outlet valve.
Further, when the rotation direction of the three-bin rotary air preheater is flue gas → primary air → secondary air, the circulating air sub-bin is positioned between the flue gas sub-bin with lower temperature and the secondary air sub-bin; when the rotation direction of the three-compartment rotary air preheater is flue gas → secondary air → primary air, the circulating air sub-compartment is positioned between the flue gas sub-compartment and the primary air sub-compartment with lower temperature.
Furthermore, the invention also comprises a crusher, a discharge pipeline, a discharge bin, an air compressor, a material conveying pipeline and a material spraying pipeline; the discharge port of the crusher is connected with a discharge pipeline, a discharge valve is mounted on the discharge pipeline, and the discharge port of the discharge pipeline is connected with a discharge bin; the air compressor machine is connected with the discharge bin, the discharge bin is connected with a material conveying pipeline, a material conveying valve is installed on the material conveying pipeline, the end of the material conveying pipeline is connected with a material spraying pipeline, the material spraying pipeline is arranged in the circulating flue gas inlet pipeline, and a material spraying nozzle is arranged on the material spraying pipeline.
Further, the air compressor conveys a solid alkaline absorbent to a conveying pipeline from a discharge bin, and the solid alkaline absorbent is Ca (OH)2、Mg(OH)2、NaOH、CaO、CaCO3、MgO、Na2CO3、NaHCO3And the like.
Furthermore, the high-temperature fan is a variable-frequency fan, and the hot flue gas circulation amount is adjusted through variable-frequency control of the high-temperature fan.
Furthermore, an air inlet and an air outlet of the circulating air sub-bin are respectively provided with a pressure sensor and a wall temperature sensor.
Further, spout the material pipeline and evenly arranged 3~7 material spraying nozzles that distribute that misplace, and there is certain contained angle between the injection direction of adjacent material spraying nozzle.
Furthermore, be provided with the vortex street blender in the circulation flue gas inlet pipeline, the vortex street blender is located the low reaches that spouts the material pipeline, the vortex street blender includes 2~6 perpendicular to flue gas flow direction evenly distributed's mixing blade, mixing blade and flue gas flow direction have 15~45 degrees contained angles.
Compared with the prior art, the invention has the following advantages and effects: the deposit at the cold end of the air preheater is heated by the heat of the extracted high-temperature flue gas, so that the blockage of the ammonium bisulfate deposit can be effectively prevented, the power consumption of a fan and the smoke discharge temperature are reduced, and the liquefaction of gaseous sulfuric acid can be prevented to a certain extent; circulating air circulates in the circulating sub-bins in a closed manner, and primary air, secondary air and smoke are not influenced; the dry alkaline solid absorbent abrasive carried in the circulating air can not only react with NH4HSO4SO in flue gas3And with liquefied H2SO4The reaction also has the adsorption function on the liquid condensed on the surface of the heat storage element, and has certain scouring and cleaning effects on the scale on the surface of the heat storage element, so that the problem of blockage of the air preheater can be effectively solved. Through arrange the material spraying mouth of a plurality of not equidirectionals on spouting the material pipeline, be favorable to the rapid mixing of circulation flue gas and alkaline absorbent even. Through the vortex street blender that simple structure is reasonable, the torrent of reinforcing flue gas flows, improves mixing efficiency, the reinforcing is to the scouring effect of the scale deposit material of heat accumulation component and to NH4HSO4SO in flue gas3And liquefied H2SO4And (4) reaction effect. The device can regularly adjust the maximum hot air circulation flow according to the actual parameters of the machine set, and the alkaline absorbent abrasive is carried by high-speed hot air to blow and sweep the heat exchange element of the rotary air preheater, so that the surface of the heat storage element is kept clean.
Drawings
FIG. 1 is a schematic view of the overall structure of the apparatus of the present invention.
Fig. 2 is a view A-A in fig. 1, and a structural schematic diagram of the transformation of the circulating air sub-bin.
Fig. 3 is a schematic view of the distribution of the spray nozzles on the spray pipe.
Fig. 4 is a schematic view of the distribution of the positions between the adjacent material nozzles on the material spraying pipeline.
FIG. 5 is a schematic view showing the distribution of mixing blades in the vortex street mixer.
In the figure: the device comprises an air preheater body 1, a circulating flue gas outlet pipeline 2, a fan inlet valve 3, a high-temperature fan 4, a fan outlet valve 5, a material spraying nozzle 6, a vortex street mixer 7, a circulating flue gas inlet pipeline 8, a crusher 9, a discharging valve 10, a discharging pipeline 11, a discharging bin 12, an air compressor 13, a material conveying pipeline 14, a material conveying valve 15, a material spraying pipeline 16 and a circulating air sub-bin 1101.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
As shown in fig. 1 to 5, a device for comprehensive treatment of blockage of a rotary air preheater comprises an air preheater body 1, wherein a primary air side, a secondary air side and a flue gas side are arranged in the air preheater body 1, and are separated by a fan-shaped plate to respectively form independent circulation channels of primary air, secondary air and flue gas; a circulating air sub-bin 1101 is divided from a cold end and a hot end of the air preheater body 1, two ends of the circulating air sub-bin 1101 are respectively connected with a circulating flue gas outlet pipeline 2 and a circulating flue gas inlet pipeline 8, the circulating flue gas outlet pipeline 2 is connected with an inlet end of a high-temperature fan 4, an outlet end of the high-temperature fan 4 is connected with the circulating flue gas inlet pipeline 8, and an inlet and an outlet of the high-temperature fan 4 are respectively provided with a fan inlet valve 3 and a fan outlet valve 5. The high temperature fan 4 extracts part of hot flue gas with the temperature of about 320 ℃ to continuously and circularly heat the cold end heat storage element of the air preheater between the circulating flue gas outlet pipeline 2 and the circulating flue gas inlet pipeline 8, so that the temperature of the cold end heat storage element is increased, and the aims of preventing the condensation of sulfuric acid vapor and the blockage of ammonium bisulfate are finally fulfilled.
When the rotation direction of the three-compartment rotary air preheater is smoke → primary air → secondary air, the circulating air compartment 1101 is located between the smoke compartment and the secondary air compartment with lower temperature; when the rotation direction of the three-compartment rotary air preheater is flue gas → secondary air → primary air, the circulating air compartment 1101 is located between the flue gas compartment and the primary air compartment with lower temperature.
The device also comprises a crusher 9, a discharge pipeline 11, a discharge bin 12, an air compressor 13, a material conveying pipeline 14 and a material spraying pipeline 16; a discharge port of the crusher 9 is connected with a discharge pipeline 11, a discharge valve 10 is installed on the discharge pipeline 11, and a discharge port of the discharge pipeline 11 is connected with a discharge bin 12; the air compressor 13 is connected with the discharge bin 12, the discharge bin 12 is connected with the material conveying pipeline 14, the material conveying pipeline 14 is provided with a material conveying valve 15, the end part of the material conveying pipeline 14 is connected with a material spraying pipeline 16, the material spraying pipeline 16 is arranged in the circulating flue gas inlet pipeline 8, and the material spraying pipeline 16 is provided with a material spraying nozzle 6.
Specifically, an air compressor 13 conveys a solid alkaline absorbent from a discharge bin 12 to a conveying pipeline 14, wherein the solid alkaline absorbent is Ca (OH)2、Mg(OH)2、NaOH、CaO、CaCO3、MgO、Na2CO3、NaHCO3And the like.
Specifically, the high-temperature fan 4 is a variable-frequency fan, the hot flue gas circulation amount is adjusted through variable-frequency control of the high-temperature fan 4, and the adjustment degree takes the pressure difference of the air preheater as guidance feedback.
Specifically, the air inlet and the air outlet of the circulating air sub-chamber 1101 are respectively provided with a pressure sensor and a wall temperature sensor to judge the blocking degree of the air preheater.
Specifically, 3-7 staggered spray nozzles 6 are uniformly arranged on the spray pipeline 16, and 120-degree included angles exist between the spraying directions of the adjacent spray nozzles 6.
Specifically, be provided with vortex street blender 7 in the circulation flue gas inlet pipeline 8, vortex street blender 7 is located the low reaches that spouts material pipeline 16, and vortex street blender 7 includes 2~6 perpendicular to flue gas flow direction evenly distributed's disc-shaped mixing blade, and mixing blade and flue gas flow direction have 30 degrees contained angles.
The device for comprehensively treating blockage of the rotary air preheater utilizes high-temperature circulating flue gas to heat the cold end temperature of the air preheater to prevent ash deposition blockage on one hand, and utilizes airflow (dry solid alkaline absorbent abrasive carried by high-temperature circulating flue gas) which is uniformly mixed and has high turbulence degree to regularly scour and clean the ash deposition on a heat storage element on the other hand, and the alkaline abrasive can also be mixed with NH4HSO4SO in flue gas3And with liquefied H2SO4The reaction and the adsorption of the liquid condensed on the surface of the heat storage element can further prevent the ash accumulation and the blockage of the air preheater.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (7)
1. A rotary type air preheater blockage comprehensive treatment device comprises an air preheater body (1), and is characterized by further comprising a crusher (9), a discharging pipeline (11), a discharging bin (12), an air compressor (13), a conveying pipeline (14) and a spraying pipeline (16); the air preheater body (1) is internally provided with a primary air side, a secondary air side and a flue gas side which are separated by a fan-shaped plate to respectively form independent circulation channels of primary air, secondary air and flue gas; a circulating air sub-bin (1101) is divided from the cold end and the hot end of the air preheater body (1), two ends of the circulating air sub-bin (1101) are respectively connected with a circulating flue gas outlet pipeline (2) and a circulating flue gas inlet pipeline (8), the circulating flue gas outlet pipeline (2) is connected with the inlet end of a high-temperature fan (4), the outlet end of the high-temperature fan (4) is connected with the circulating flue gas inlet pipeline (8), and a fan inlet valve (3) and a fan outlet valve (5) are respectively arranged at the inlet and the outlet of the high-temperature fan (4); a discharge port of the crusher (9) is connected with a discharge pipeline (11), a discharge valve (10) is mounted on the discharge pipeline (11), and a discharge port of the discharge pipeline (11) is connected with a discharge bin (12); air compressor machine (13) are connected with play feed bin (12), it connects conveying pipeline (14) to go out feed bin (12), install defeated material valve (15) on conveying pipeline (14), the end connection of conveying pipeline (14) spouts material pipeline (16), spout material pipeline (16) and set up in circulation flue gas inlet pipeline (8), it spouts material mouth (6) to be provided with on material pipeline (16).
2. The device for the comprehensive treatment of the blockage of the rotary air preheater according to claim 1, wherein when the rotary direction of the three-compartment rotary air preheater is flue gas → primary air → secondary air, the circulating air sub-compartment (1101) is located between the flue gas sub-compartment with lower temperature and the secondary air sub-compartment; when the rotation direction of the three-compartment rotary air preheater is flue gas → secondary air → primary air, the circulating air compartment (1101) is positioned between the flue gas compartment with lower temperature and the primary air compartment.
3. The rotary type air preheater blockage comprehensive treatment device according to claim 1, wherein the air compressor (13) conveys a solid alkaline absorbent from a discharge bin (12) to a conveying pipeline (14), and the solid alkaline absorbent is Ca (OH)2、Mg(OH)2、NaOH、CaO、CaCO3、MgO、Na2CO3And NaHCO3One or more of them.
4. The rotary type air preheater blockage comprehensive treatment device as claimed in claim 1, wherein the high-temperature fan (4) is a variable-frequency fan.
5. The rotary type air preheater blockage comprehensive treatment device as claimed in claim 1 or 2, wherein an air inlet and an air outlet of the circulating air sub-bin (1101) are respectively provided with a pressure sensor and a wall temperature sensor.
6. The rotary type air preheater blockage comprehensive treatment device as claimed in claim 1, wherein 3-7 staggered material spraying nozzles (6) are uniformly arranged on the material spraying pipeline (16), and a certain included angle is formed between the spraying directions of the adjacent material spraying nozzles (6).
7. The rotary type air preheater blockage comprehensive treatment device according to claim 1, wherein a vortex street mixer (7) is arranged in the circulating flue gas inlet pipeline (8), the vortex street mixer (7) is positioned at the downstream of the material spraying pipeline (16), the vortex street mixer (7) comprises 2-6 mixing blades which are uniformly distributed perpendicular to the flow direction of flue gas, and an included angle of 15-45 degrees is formed between each mixing blade and the flow direction of the flue gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010832483.7A CN112161512A (en) | 2020-08-18 | 2020-08-18 | Device that rotation air preheater blockked up comprehensive control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010832483.7A CN112161512A (en) | 2020-08-18 | 2020-08-18 | Device that rotation air preheater blockked up comprehensive control |
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| CN202010832483.7A Pending CN112161512A (en) | 2020-08-18 | 2020-08-18 | Device that rotation air preheater blockked up comprehensive control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923392A (en) * | 2021-03-19 | 2021-06-08 | 苏州西热节能环保技术有限公司 | Method for removing hardened ash scale of boiler air preheater |
| CN113686195A (en) * | 2021-07-07 | 2021-11-23 | 华能伊春热电有限公司 | Clear stifled equipment of sack dust remover unit air preheater intelligent monitoring |
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| CN105605604A (en) * | 2016-03-10 | 2016-05-25 | 大唐贵州发耳发电有限公司 | Anticorrosion/anti-blocking system with air preheaters |
| CN106345244A (en) * | 2016-10-17 | 2017-01-25 | 浙江大学 | Device and method for removing sulfur trioxide from coal-fired flue gas |
| CN206504355U (en) * | 2017-02-28 | 2017-09-19 | 南京博沃科技发展有限公司 | It is a kind of to utilize the anti-blocking grey air preheater of alkaline tempering system |
| CN206989804U (en) * | 2017-09-25 | 2018-02-09 | 湖南大唐先一能源管理有限公司 | A kind of block clearing anti-block apparatus of rotary regenerative air preheater |
| CN109340811A (en) * | 2018-09-26 | 2019-02-15 | 大唐东北电力试验研究院有限公司 | A kind of rotary regenerative air preheater counterflow heat exchange anti-block apparatus |
| CN209302533U (en) * | 2017-12-15 | 2019-08-27 | 沈阳洛卡环保工程有限公司 | A kind of process system for flue gas two stage removing sulfur trioxide |
| CN111306567A (en) * | 2020-02-20 | 2020-06-19 | 华电电力科学研究院有限公司 | Hot air positive pressure blowing system for inhibiting blockage of air preheater and working method thereof |
| CN213362538U (en) * | 2020-08-18 | 2021-06-04 | 华电电力科学研究院有限公司 | Device for comprehensively treating blockage of rotary air preheater |
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5044424A (en) * | 1980-12-19 | 1991-09-03 | Monro Richard J | Heat generator |
| CN105605604A (en) * | 2016-03-10 | 2016-05-25 | 大唐贵州发耳发电有限公司 | Anticorrosion/anti-blocking system with air preheaters |
| CN106345244A (en) * | 2016-10-17 | 2017-01-25 | 浙江大学 | Device and method for removing sulfur trioxide from coal-fired flue gas |
| CN206504355U (en) * | 2017-02-28 | 2017-09-19 | 南京博沃科技发展有限公司 | It is a kind of to utilize the anti-blocking grey air preheater of alkaline tempering system |
| CN206989804U (en) * | 2017-09-25 | 2018-02-09 | 湖南大唐先一能源管理有限公司 | A kind of block clearing anti-block apparatus of rotary regenerative air preheater |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923392A (en) * | 2021-03-19 | 2021-06-08 | 苏州西热节能环保技术有限公司 | Method for removing hardened ash scale of boiler air preheater |
| CN112923392B (en) * | 2021-03-19 | 2022-05-17 | 苏州西热节能环保技术有限公司 | A method for removing fouling scale on boiler air preheater plate |
| CN113686195A (en) * | 2021-07-07 | 2021-11-23 | 华能伊春热电有限公司 | Clear stifled equipment of sack dust remover unit air preheater intelligent monitoring |
| CN113686195B (en) * | 2021-07-07 | 2023-10-27 | 华能伊春热电有限公司 | Intelligent monitoring and blocking removing equipment for air pre-heater of bag-type dust collector unit |
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Application publication date: 20210101 |