CN110848729A - Rotary air preheater blockage prevention and control system and working method thereof - Google Patents
Rotary air preheater blockage prevention and control system and working method thereof Download PDFInfo
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- CN110848729A CN110848729A CN201910996398.1A CN201910996398A CN110848729A CN 110848729 A CN110848729 A CN 110848729A CN 201910996398 A CN201910996398 A CN 201910996398A CN 110848729 A CN110848729 A CN 110848729A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
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- 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
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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
- 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
- Y02E20/34—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 invention discloses a rotary air preheater blockage prevention system and a working method thereof, relating to the field of air preheaters and aiming at the problems of poor blockage prevention effect, easy blockage during operation and poor heat exchange effect of the existing air preheaters, the rotary air preheater comprises a boiler, wherein the boiler is fixedly connected and communicated with an SCR (selective catalytic reduction) denitration device through a flue II, the SCR denitration device is fixedly connected and communicated with the upper end of the air preheater through a flue III, the upper end of the air preheater is fixedly installed and communicated with a primary air pipeline of the air preheater and a secondary air pipeline of the air preheater, the upper end of the air preheater is fixedly connected and communicated with the upper end of a circulating fan through a hot end air outlet pipe of a small sub-bin, the circulating fan is fixedly installed and communicated with an electric heater through a connecting air pipe, the electric heater is fixedly installed and communicated with the lower end of the air preheater through a cold end air inlet pipe of the small sub-bin, the rotary air preheater has good, can absorb and utilize the heat in the flue gas, and is suitable for popularization and use.
Description
Technical Field
The invention relates to the field of air preheaters, in particular to a blockage prevention system of a rotary air preheater.
Background
With the increasing strictness of the national environmental protection standard, the coal-fired units of the power plants are successively subjected to ultralow emission reconstruction. On the other hand, for the purpose of renewable energy consumption, the thermal power generating unit participates in deep peak regulation, and the unit operates frequently under variable load. Due to the two factors, the ammonia escape amount of the SCR denitration system is high, and the escaped ammonia and SO generated by burning coal in flue gas3The reaction takes place to form Ammonium Bisulfate (ABS). When flue gas generated by a coal-fired boiler of a power plant passes through the air preheater, the temperature of the flue gas is gradually reduced, ammonium bisulfate in the flue gas is condensed and adhered with fly ash, the fly ash is deposited on the surface of the air preheater to form blockage, the heat exchange effect of the air preheater is influenced, the heat storage element of the air preheater is corroded at low temperature, and the safe operation of a unit is influenced in severe cases. Partial power plants improve the temperature of primary air and secondary air inlet air by arranging an air heater and a hot air recirculation system, but when the average ambient temperature of the power plants is lower, especially when the power plants operate in winter, the temperature of the air inlet air of the air preheater and the comprehensive temperature of the cold end of the air preheater are still lower, and the problem of blockage of the air preheater cannot be avoided. Therefore, the blockage of the air preheater and the corrosion of equipment are difficult problems which are urgently needed to be solved and faced by the coal-fired unit.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a rotary air preheater blockage prevention and control system with reasonable design, and solves the problems of poor blockage prevention effect, easy blockage in the operation process and poor heat exchange effect of an air preheater in a flue system of a coal-fired boiler of a power plant in the prior art.
The technical scheme adopted by the invention for solving the problems is as follows: a rotary air preheater blockage prevention and control system comprises a boiler and is characterized in that the boiler is fixedly connected and communicated with an SCR (selective catalytic reduction) denitration device through a second flue, the SCR denitration device is fixedly connected and communicated with the upper end of an air preheater through a third flue, the upper end of the air preheater is fixedly installed and communicated with an air preheater primary air pipeline and an air preheater secondary air pipeline, the upper end of the air preheater is fixedly connected and communicated with the upper end of a circulating fan through a small bin hot end air outlet pipe, the circulating fan is fixedly installed and communicated with an electric heater through a connecting air pipe, the electric heater is fixedly installed and communicated with the lower end of the air preheater through a small bin cold end air inlet pipe, the lower end of the air preheater is fixedly installed and communicated with a heat pipe heat exchanger through an air preheater primary air inlet pipe, an air preheater secondary air inlet pipe and a fourth flue, a secondary fan and a primary fan are arranged above the heat pipe heat exchanger, and the lower extreme of secondary fan and primary air fan passes through air inlet pipeline and heat pipe heat exchanger fixed connection and intercommunication respectively, heat pipe heat exchanger passes through five and electrostatic precipitator fixed mounting and intercommunication in flue, electrostatic precipitator passes through flue one and desulfurizing tower fixed connection and intercommunication, the desulfurizing tower passes through flue six and chimney fixed mounting and intercommunication.
Preferably, the heat pipe heat exchanger comprises a shell, a heat insulation plate is fixedly installed on the inner wall of the shell, a flue four is fixedly installed and communicated with the left end of the shell, a flue five is fixedly installed and communicated with the right end of the shell, the flue four and the flue five are both located below the heat insulation plate, a heat exchange tube is fixedly installed on the left side of the bottom end of the inner wall of the shell along the vertical direction, the upper end of the heat exchange tube penetrates through the heat insulation plate, two condenser tubes are fixedly connected to the right side of the top of the heat exchange tube and above the heat insulation plate, partition plates are respectively fixedly connected to the inner wall of the shell on the left sides of the two condenser tubes, the two condenser tubes are respectively arranged in independently sealed spaces, the top ends of the two independently sealed spaces are respectively communicated with an air inlet pipeline, and the bottom ends of the two independently sealed spaces are respectively fixedly connected with an air preheater secondary air inlet, the bottom of air preheater overgrate air-supply line and air preheater primary air-supply line runs through the bottom of heat insulating board and shell to with the bottom fixed connection of air preheater, air preheater overgrate air-supply line and air preheater primary air-supply line are corresponding with air preheater overgrate air pipeline and air preheater primary air pipeline respectively, two the bottom of condenser pipe is respectively with back flow fixed connection, the one end that the condenser pipe was kept away from to the back flow runs through baffle and shell and with the bottom right side fixed connection of heat exchange tube.
Preferably, the lower end of the outer wall of the heat exchange tube is uniformly and fixedly connected with a plurality of lower fins, and the lower fins are all located below the heat insulation plate.
Preferably, a plurality of upper fins are uniformly and fixedly connected to the outer walls of the two condensation pipes respectively.
Preferably, heat exchange water is injected into the heat exchange pipe below the heat insulation plate, and a water injection valve is fixedly connected to the upper portion of the right side of the return pipe.
The working method of the blockage prevention and control system of the rotary air preheater is characterized by comprising the following steps of: flue gas in a boiler enters an SCR denitration device through a second flue to be subjected to denitration treatment, the denitrated flue gas enters an air preheater through a third flue and passes through the air preheater and enters a fourth flue, hot air at the upper end of the air preheater is blown to an electric heater by starting a circulating fan and the electric heater, the electric heater works to heat the hot air, the hot air enters the air preheater, the area is set to be a small sub-bin, a rotor in the air preheater before entering the flue gas side can be heated, the electric heater adjusts the temperature of the circulating air, the electric heater is started according to the coal quality condition when needed, when the temperature of the circulating air is enough to enable the air preheater to be not blocked, the electric heater is not started, but when the coal quality is not good, the amount of the hot air needed in the boiler is large, and when higher temperature is needed in the small sub-bin, in order to ensure the heating effect of the small sub-bin, the high-temperature smoke in the air preheater enters the inside of the shell through the fourth flue, the high temperature in the high-temperature smoke is absorbed by the heat exchange tubes, so that the heat exchange water in the heat exchange tubes is heated, the heat exchange water is heated and vaporized to form water vapor, the water vapor rises and respectively enters the condensation tubes, at the moment, the primary fan and the secondary fan work, cold air is respectively blown into the sealed spaces where the two condensation tubes are located through the air inlet pipeline, the cold air absorbs the heat emitted by the condensation tubes and the upper fins and becomes hot air, after the cold air absorbs the heat, the vaporized water vapor in the condensation tubes is liquefied to form water when meeting cold, the water flows back into the heat exchange tubes along the return pipes, circulation is realized, the cold air enters the sealed spaces where the two condensation tubes are located from the primary fan and the secondary fan, and becomes hot air after the heat is absorbed, and the flue gas which is absorbed with part of heat enters the electric dust remover through the fifth flue, the electric dust remover realizes electrostatic dust removal on the flue gas, the flue gas after dust removal enters the desulfurizing tower through the first flue, the desulfurizing tower realizes desulfurization treatment on the flue gas, and the flue gas after desulfurization enters the chimney through the sixth flue and is discharged.
Compared with the prior art, the invention has the following advantages and effects: the small sub-bin is arranged before the rotor of the air preheater enters the flue gas side, and high-temperature hot air is driven by the circulating fan, so that the heat storage elements at the cold end in the small sub-bin can be heated, the temperature of the rotor before entering the flue gas side is increased, and fogging or ammonium bisulfate condensation caused by over-low temperature of the heat storage elements at the flue gas side is avoided; the electric heater is arranged in the circulating air duct, so that the temperature adjusting range in the small sub-bin is enlarged, the influence on the combustion of the boiler is reduced, and the coal quality change range of the coal as fired can be enlarged; the heat pipe heat exchanger, the heat exchange pipe, the lower fin, the upper fin, the return pipe, the heat insulation plate, the condensing pipe and the like are arranged to be matched with each other, so that the heat in the hot flue gas discharged by the air preheater can be fully absorbed and reused, and the utilization effect of the waste heat of the flue gas is improved; the heat pipe heat exchanger is used for adjusting the temperature of the flue gas entering the electric dust collector, and the flue gas temperature is adjusted to the optimal temperature based on the influence mechanism of the temperature on the dust specific resistance, so that the dust removal efficiency of the electric dust collector is improved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a structural sectional view of a heat pipe heat exchanger according to an embodiment of the present invention.
In the figure: boiler 1, air preheater primary air pipeline 2, primary air fan 3, flue I4, desulfurizing tower 5, air preheater secondary air pipeline 6, SCR denitrification device 7, chimney 8, flue II 9, flue III 10, small compartment hot end air outlet pipe 11, air preheater 12, circulating fan 13, connecting air pipe 14, electric heater 15, small compartment cold end air inlet pipe 16, air preheater secondary air inlet pipe 17, flue IV 18, heat pipe heat exchanger 19, flue V20, electric dust remover 21, air inlet pipeline 22, flue VI 23, secondary air fan 24, air preheater primary air inlet pipe 25, heat exchange pipe 1901, lower fin 1902, backflow pipe 1903, temperature insulating plate 1904, upper fin 1905, shell 1906, condensing pipe 1907, partition 1908 and water injection valve 1909.
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.
Examples are given.
Referring to fig. 1 to 2, the system for preventing and treating blockage of a rotary air preheater in the embodiment includes a boiler 1, a right end of the boiler 1 is fixedly connected and communicated with a left end of an SCR denitration device 7 through a second flue 9, a right end of the SCR denitration device 7 is fixedly connected and communicated with an upper end of an air preheater 12 through a third flue 10, the upper end of the air preheater 12 is fixedly installed and communicated with an air preheater primary air pipeline 2 and an air preheater secondary air pipeline 6, the air preheater primary air pipeline 2 and the air preheater secondary air pipeline 6 are convenient for outputting and utilizing hot air, the upper end of the air preheater 12 is fixedly connected and communicated with an upper end of a circulating fan 13 through a small sub-bin hot end air outlet pipe 11, a right side of the circulating fan 13 is fixedly installed and communicated with an electric heater 15 through a connecting air pipe 14, the electric heater 15 is convenient for adjusting flue gas temperature, the right end of the electric heater 15 is fixedly installed and communicated with a lower end of the air preheater 12 through a small sub-bin cold, the lower extreme of air preheater 12 is through air preheater primary air inlet pipe 25, air preheater overgrate air inlet pipe 17 and four 18 and flue 19 fixed mounting and intercommunication of heat pipe exchanger, heat pipe exchanger 19's top is provided with secondary air fan 24 and primary air fan 3, two fans are convenient for blow toward heat pipe exchanger 19 is interior, and secondary air fan 24 and primary air fan 3's lower extreme respectively through air inlet pipe 22 and heat pipe exchanger 19 fixed connection and intercommunication, heat pipe exchanger 19's right-hand member passes through five 20 and electrostatic precipitator 21 fixed mounting and intercommunication of flue, electrostatic precipitator 21's right-hand member passes through flue one 4 and desulfurizing tower 5 fixed connection and intercommunication, desulfurizing tower 5's right-hand member passes through six 23 and chimney 8 fixed mounting and intercommunication of flue.
The heat pipe exchanger 19 comprises a housing 1906, a heat insulation plate 1904 is fixedly installed on the inner wall of the housing 1906, a flue four 18 is fixedly installed and communicated with the left end of the housing 1906, a flue five 20 is fixedly installed and communicated with the right end of the housing 1906, the flue four 18 and the flue five 20 are both located below the heat insulation plate 1904, a heat exchange pipe 1901 is fixedly installed on the left side of the bottom end of the inner wall of the housing 1906 along the vertical direction, the upper end of the heat exchange pipe 1901 penetrates through the heat insulation plate 1904, two condensation pipes 1907 are fixedly connected to the right side of the top of the heat exchange pipe 1901 and located above the heat insulation plate 1904, partition plates 1908 are respectively and fixedly connected to the inner wall of the housing 1906 on the left side of the two condensation pipes 1907, the two condensation pipes 1907 are respectively in independently sealed spaces, the top ends of the two independently sealed spaces are respectively communicated with an air inlet pipe 22, the bottom ends of the two independently sealed spaces are respectively, the bottom ends of an air preheater secondary air inlet pipe 17 and an air preheater primary air inlet pipe 25 penetrate through the bottom ends of a heat insulation plate 1904 and a shell 1906 and are fixedly connected with the bottom end of an air preheater 12, the bottom ends of two condensing pipes 1907 are fixedly connected with a return pipe 1903 respectively, one end, far away from the condensing pipes 1907, of the return pipe 1903 penetrates through a partition plate 1908 and the shell 1906 and is fixedly connected with the right side of the bottom end of a heat exchange pipe 1901, the design achieves absorption and utilization of the temperature in flue gas, the lower end of the outer wall of the heat exchange pipe 1901 is uniformly and fixedly connected with a plurality of lower fins 1902, the lower fins 1902 are located below the heat insulation plate 1904, and the absorption effect of heat in the flue gas can be improved by the arrangement of the lower fins 1902; evenly fixedly connected with a plurality of upper fins 1905 respectively on the outer wall of two condenser pipes 1907, upper fins 1905 can improve the effect that gives off the heat, and the below injection that just is located insulation board 1904 in heat exchange tube 1901 has the heat transfer water, and the heat can be realized absorbing the recycle to heat in the flue gas to the heat transfer water, and the right side top fixedly connected with water injection valve 1909 of back flow 1903 is convenient for toward water injection in the back flow 1903.
The working method comprises the following steps: the flue gas in the boiler 1 enters the SCR denitration device 7 through the second flue 9 for denitration treatment, the denitrated flue gas enters the air preheater 12 through the third flue 10, passes through the air preheater 12 and enters the fourth flue 18, the circulating fan 13 and the electric heater 15 are started, the circulating fan 13 works to blow hot air at the upper end of the air preheater 12 to the electric heater 15, the electric heater 15 works to heat the hot air, the hot air enters the air preheater 12, the area is set into a small sub-bin, a rotor in the air preheater 12 before the flue gas enters the flue gas side can be heated, the electric heater 15 can adjust the temperature of the circulating air, the electric heater 15 can be started according to the coal quality condition when needed, for example, if the circulating air temperature is enough to enable the air preheater 12 not to be blocked, the electric heater 15 can not be started, but if the coal quality is not good, the amount of hot air needed in the boiler is large, when the temperature in the small sub-warehouse is required to be higher, in order to ensure the heating effect of the small sub-warehouse and reduce the influence on the combustion in the furnace, the electric heater 15 is started to improve the temperature of the circulating air, the high-temperature flue gas in the air preheater 12 enters the shell 1906 through the flue four 18, the high temperature in the high-temperature flue gas can be absorbed by the heat exchange tube 1901, so as to heat the heat exchange water in the heat exchange tube 1901, the heat exchange water is heated and vaporized to become water vapor, the water vapor rises to enter the condenser tubes 1907 respectively, at the moment, the primary fan 3 and the secondary fan 24 work, cold air is blown into the sealed space where the two condenser tubes 1907 are respectively through the air inlet pipe 22, the cold air absorbs the heat emitted by the condenser tubes 1907 and the upper fins 1905 to become hot air, after the heat absorption, the vaporized water in the condenser tubes 1907 is liquefied to become water vapor when meeting the cold air, the water vapor flows back into the heat exchange tube, circulation is realized, cold air entering a sealed space where two condensing pipes 1907 are located from a primary air fan 3 and a secondary air fan 24 is changed into hot air after absorbing heat, the cold air returns to an air preheater 12 through an air preheater primary air inlet pipe 25 and an air preheater secondary air inlet pipe 17 to be reused, a part of heat-absorbed flue gas enters a flue gas deduster 21 through a flue five 20, an electric dust precipitator 21 can realize electrostatic dust removal on the flue gas, the dedusted flue gas enters a desulfurizing tower 5 through a flue one 4, the desulfurizing tower 5 can realize desulfurization on the flue gas, and the desulfurized flue gas enters a chimney 8 through a flue six 23 to be discharged, in the invention, an SCR denitration device 7, the air preheater 12, the electric dust precipitator 21 and the desulfurizing tower 5 are all existing structures in the flue system of the coal-fired boiler of the existing power plant, the invention has good anti-blockage effect and good heat exchange effect, and can absorb and utilize the heat in the flue gas, is suitable for popularization and application.
Those not described in detail in this specification are well within the skill of the art.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first," "second," "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, features defined as "first," "second," "first," "second," etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
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 (6)
1. A rotary air preheater blockage prevention and control system comprises a boiler (1) and is characterized in that the boiler (1) is fixedly connected and communicated with an SCR (selective catalytic reduction) denitration device (7) through a second flue (9), the SCR denitration device (7) is fixedly connected and communicated with the upper end of an air preheater (12) through a third flue (10), the upper end of the air preheater (12) is fixedly installed and communicated with an air preheater primary air pipeline (2) and an air preheater secondary air pipeline (6), the upper end of the air preheater (12) is fixedly connected and communicated with the upper end of a circulating fan (13) through a small bin hot end air outlet pipe (11), the circulating fan (13) is fixedly installed and communicated with an electric heater (15) through a connecting air pipe (14), the electric heater (15) is fixedly installed and communicated with the lower end of the air preheater (12) through a small bin cold end air inlet pipe (16), the lower extreme of air preheater (12) is through air preheater primary air-supply line (25), air preheater overgrate air-supply line (17) and four (18) of flue and heat pipe exchanger (19) fixed mounting and intercommunication, the top of heat pipe exchanger (19) is provided with secondary fan (24) and primary air fan (3), and the lower extreme of secondary fan (24) and primary air fan (3) is respectively through air-supply line (22) and heat pipe exchanger (19) fixed connection and intercommunication, heat pipe exchanger (19) are through five (20) of flue and electrostatic precipitator (21) fixed mounting and intercommunication, electrostatic precipitator (21) are through flue (4) and desulfurizing tower (5) fixed connection and intercommunication, desulfurizing tower (5) are through six (23) of flue and chimney (8) fixed mounting and intercommunication.
2. The rotary air preheater blockage prevention and control system according to claim 1, wherein the heat pipe heat exchanger (19) comprises an outer shell (1906), a heat insulation plate (1904) is fixedly installed on the inner wall of the outer shell (1906), a flue four (18) is fixedly installed and communicated with the left end of the outer shell (1906), a flue five (20) is fixedly installed and communicated with the right end of the outer shell (1906), the flue four (18) and the flue five (20) are both located below the heat insulation plate (1904), a heat exchange pipe (1901) is fixedly installed on the left side of the bottom end of the inner wall of the outer shell (1906) along the vertical direction, the upper end of the heat exchange pipe (1901) penetrates through the heat insulation plate (1904), two condensation pipes (1907) are fixedly connected to the right side of the top of the heat exchange pipe (1901) and above the heat insulation plate (1904), partition plates (1908) are respectively and fixedly connected to the inner wall of the outer shell (1906) on the left side of the two, the two condensation pipes (1907) are respectively arranged in independent sealed spaces, the top ends of the two independent sealed spaces are respectively communicated with an air inlet pipeline (22), the bottom ends of the two independent sealed spaces are respectively and fixedly connected with an air preheater secondary air inlet pipe (17) and an air preheater primary air inlet pipe (25), the bottom ends of the air preheater secondary air inlet pipe (17) and the air preheater primary air inlet pipe (25) penetrate through the bottom ends of the heat insulation plate (1904) and the shell (1906) and are fixedly connected with the bottom end of the air preheater (12), the bottom ends of the two condensation pipes (1907) are respectively and fixedly connected with a return pipe (1903), one end, far away from the condensation pipe (1907), of the return pipe (1903) penetrates through a partition plate (1908) and the shell (1906) and is connected with a right heat exchange pipe (1901) of the heat exchange pipe (1901) The side is fixedly connected.
3. The rotary air preheater blockage prevention and control system as claimed in claim 2, wherein a plurality of lower fins (1902) are uniformly and fixedly connected to the lower end of the outer wall of the heat exchange tube (1901), and the lower fins (1902) are all located below the temperature insulation plate (1904).
4. The rotary air preheater blockage control system according to claim 2, wherein a plurality of upper fins (1905) are uniformly and fixedly connected to the outer walls of the two condensation pipes (1907), respectively.
5. The rotary air preheater blockage prevention and control system as claimed in claim 2, wherein heat exchange water is injected into the heat exchange pipe (1901) below the heat insulation plate (1904), and a water injection valve (1909) is fixedly connected to the upper right side of the return pipe (1903).
6. The working method of the rotary air preheater blockage control system as recited in any one of claims 1 to 5, is characterized by comprising the following steps: flue gas in a boiler (1) enters an SCR denitration device (7) through a flue II (9) for denitration treatment, the denitrated flue gas enters an air preheater (12) through a flue III (10), passes through the air preheater (12) and enters a flue IV (18), by starting a circulating fan (13) and an electric heater (15), the circulating fan (13) blows hot air at the upper end of the air preheater (12) to the electric heater (15), the electric heater (15) heats the hot air by working, the hot air enters the air preheater (12), the area is set into a small sub-bin, a rotor in the air preheater (12) before entering the flue gas side can be heated, the electric heater (15) adjusts the temperature of the circulating air, the electric heater (15) is started as required according to the coal quality condition, and when the temperature of the circulating air is enough to enable the air preheater not to be blocked, the electric heater (15) is not started, but when the coal quality is poor, the amount of hot air needed in the furnace is large, and when the temperature in the small sub-bin is also higher, in order to ensure the heating effect on the small sub-bin and reduce the influence on the combustion in the furnace, the electric heater (15) is started to improve the temperature of circulating air, high-temperature flue gas in the air preheater (12) enters the inside of the shell (1906) through the flue four (18), the high temperature in the high-temperature flue gas is absorbed by the heat exchange tube (1901), so that the heat exchange water in the heat exchange tube (1901) is heated, the heat exchange water is heated and vaporized into water vapor, the water vapor rises and respectively enters the condensing tubes (1907), at the moment, the primary fan (3) and the secondary fan (24) work, cold air is respectively blown into the sealed spaces where the two condensing tubes (1907) are located through the air inlet pipeline (22), and the heat emitted by the condensing tubes (1907) and the upper fins (1905) is absorbed, the cold air absorbs heat, the vaporized vapor in the condensing pipe (1907) is liquefied into water when meeting the cold, the water flows back to the heat exchange pipe (1901) along the return pipe (1903) to realize circulation, the cold air entering the sealed space where the two condensing pipes (1907) from the primary fan (3) and the secondary fan (24) changes into hot air after absorbing heat, and get back to air preheater (12) through air preheater primary air inlet pipe (25) and air preheater secondary air inlet pipe (17) and recycle, the flue gas that is absorbed a part of heat enters into electrostatic precipitator (21) through flue five (20), electrostatic precipitator (21) realize carrying out electrostatic precipitator to the flue gas, flue gas after the dust removal enters into desulfurizing tower (5) through flue one (4), desulfurizing tower (5) realize carrying out desulfurization treatment to the flue gas, flue gas after the desulfurization enters into chimney (8) through flue six (23) and discharges.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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