CN112460627A - Air preheater with cleaning function and cleaning method thereof - Google Patents
Air preheater with cleaning function and cleaning method thereof Download PDFInfo
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- CN112460627A CN112460627A CN202011240346.0A CN202011240346A CN112460627A CN 112460627 A CN112460627 A CN 112460627A CN 202011240346 A CN202011240346 A CN 202011240346A CN 112460627 A CN112460627 A CN 112460627A
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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
- F23L15/02—Arrangements of regenerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D17/00—Regenerative heat-exchange apparatus in which a stationary intermediate heat-transfer medium or body is contacted successively by each heat-exchange medium, e.g. using granular particles
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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
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
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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
- F28G15/003—Control arrangements
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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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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- Thermal Sciences (AREA)
- Air Supply (AREA)
Abstract
The invention discloses an air preheater with a cleaning function and a cleaning method thereof, and belongs to the technical field of air preheaters. Wherein, air heater with clearance function includes: the invention provides an independent cleaning space for a heat storage element on the rotor by arranging a cleaning air duct in the shell, the cleaning air duct introduces hot air from a first air outlet of the shell through the first air duct to clean the heat storage element, and the cleaned hot air enters the first air duct through the second air duct, so that the temperature of the air entering the first air duct is improved, the collection and the reutilization of heat are realized, and the collection and the reutilization of heat are realized. Compared with the prior art, the invention improves the cleaning effect of the air preheater, can realize the collection and the reutilization of heat, and has simple structure and easy realization.
Description
This patent is the divisional application, and the information of former application is as follows, the name: a rotary air preheater with a cleaning function and a cleaning method thereof are disclosed in the application number: 2019107736945, filing date: year 2019, month 08, day 21.
Technical Field
The invention belongs to the technical field of air preheaters, and particularly relates to an air preheater with a cleaning function and a cleaning method thereof.
Background
In a coal-fired power plant, the emission concentration of nitrogen oxides in the flue gas of a coal-fired boiler has strict national standard, at present, the coal-fired power plant mainly adopts the additional flue gas denitration system to treat the flue gas, the denitration process mainly adopts a Selective Catalytic Reduction (SCR) method, and NH is utilized under the action of a catalyst3Reducing agents such as liquid nitrogen and urea and NO in flue gasXReacting to generate nontoxic and pollution-free N2And H2O, because the process is simple, the denitration efficiency is high, the technology is mature, and the like, the method is widely applied to coal-fired power plants. However, in this process, two side reactions, SO, occur2+O2→SO3And NH3+SO3+H2O→NH4HSO4Adversely affecting the operation of the air preheater downstream of the denitration system.
The air preheater is an important component of a coal-fired boiler, and utilizes the heat of boiler flue gas to preheat air required by the combustion of the coal-fired boiler so as to preheat the air to a certain temperature to improve the heat exchange performance of the boiler and reduce the heat loss, and mainly comprises a shell and a rotor arranged in the shell, wherein a flue gas channel and an air channel are divided in the shell, the rotor is divided into a plurality of fan-shaped heat storage areas through a partition plate, a heat storage element is arranged in each heat storage area, in the working process, the rotor rotates at the rotating speed of 1-3 r/min, the heat storage element in the flue gas channel is heated by high-temperature flue gas, in the process of rotor rotation, the heated heat storage element rotates to the air channel to heat the air in the air channel, the heated air is used for being guided into a boiler for the requirement of coal combustion, and the rotor rotates for a circle to complete sequential heat exchange.
SO in flue gas3The sulfuric acid steam is generated by combining with the water vapor, and the higher the concentration is, the higher the acid dew point of the flue gas is, the temperature can reach 140-2SO4The liquid drops not only aggravate the problem of low-temperature corrosion of the air preheater, but also more easily adsorb fly ash; in addition, NH is generated4HSO4The fly ash is liquid in the temperature range of 146-. In the prior art, pressure gas is mainly adopted for soot blowing and cleaning the heat storage element, the cleaning method has poor effect and causes energy waste.
Disclosure of Invention
The invention provides an air preheater with a cleaning function and a cleaning method thereof, which are used for optimizing the performance of the conventional air preheater.
In order to achieve the purpose, the invention adopts the following technical scheme:
an air preheater with a cleaning function, comprising: the shell, locate rotor and pivot in the casing, the fixed cover of rotor connects in the pivot, the one end of pivot is connected with the actuating mechanism who is fixed in the frame, the casing includes relative hot junction and cold junction that sets up, the hot junction includes flue gas inlet, first air outlet, second air outlet and clearance air outlet in proper order, the cold junction correspondence includes exhanst gas outlet, first air intake, second air intake and clearance air intake, be formed with the flue gas duct between flue gas inlet and the exhanst gas outlet, form first wind channel between first air intake and the first air outlet, form the second wind channel between second air intake and the second air outlet, form the clearance wind channel between clearance air intake and the clearance air outlet, flue gas outlet and first air intake, first air intake and second air intake, second air intake and clearance air intake, clearance air intake and flue gas outlet, Fan-shaped sealing plates are arranged between the flue gas inlet and the first air outlet, between the first air outlet and the second air outlet, between the second air outlet and the cleaning air outlet, and between the cleaning air outlet and the flue gas inlet;
air heater still includes first tuber pipe, second tuber pipe and signal processing system, the one end and the first air outlet of first tuber pipe are connected, the other end and the clearance air intake connection of first tuber pipe, the one end and the clearance air outlet of second tuber pipe are connected, the other end and the first air inlet of second tuber pipe are connected, be equipped with the solenoid valve on the first tuber pipe, the one end that the second tuber pipe is close to the clearance air outlet is equipped with first temperature sensor, solenoid valve and first temperature sensor are connected with the signal processing system communication.
In a further embodiment, the air preheater further comprises a second temperature sensor, the second temperature sensor is arranged at one end, close to the first air outlet, of the inner wall of the shell, the second temperature sensor is in communication connection with the signal processing system, the temperature of hot air at the first air outlet can be detected in real time through the second temperature sensor, when the temperature reaches a set temperature, the electromagnetic valve is opened through the signal processing system to enable the hot air to enter the cleaning air channel to clean heat storage elements on the rotor, the automation degree of the cleaning process of the air preheater is improved, and the problems of heat loss and incomplete cleaning caused by direct cleaning when the temperature of the hot air does not reach the set temperature are solved.
In a further embodiment, the second air duct is further provided with a high pressure fan for introducing hot air exhausted from the cleaning air outlet into the first air duct, the hot air entering the second air duct is pressurized by the high pressure fan, and the pressurized hot air is blown into the first air duct through the first air inlet to be mixed with cold air entering the first air duct from the first air inlet, so that the temperature of the air entering the first air duct is increased, and the collection and the reutilization of heat are realized.
In a further embodiment, a cleaning air inlet plate is arranged at the cleaning air inlet of the shell, a plurality of air holes penetrating through the cleaning air inlet plate are formed in the upper end surface and the lower end surface of the cleaning air inlet plate, the diameter of one end, far away from the first air pipe, of each air hole is smaller than that of one end, close to the first air pipe, of each air hole, and through the arrangement, hot air enters the cleaning air channel through the air holes and is compressed to cause the pressure of air beams to rise, so that the cleaning effect is improved.
In a further embodiment, the inner wall of the air hole is provided with a spiral groove taking the central axis of the air hole as a rotation axis, and hot air enters the cleaning air channel to form a rotating air beam through the arrangement, so that the heat storage element is cleaned from multiple angles, and the cleaning effect is improved.
In a further embodiment, a set inclination angle is formed between the central axis of the air hole and the upper end surface and the lower end surface of the cleaning air inlet plate, so that the hot air enters the cleaning air channel to form an inclined air beam, the heat storage element is cleaned from the bottom surface and the side surface, and the cleaning effect is improved.
In a further embodiment, the number of the air holes on the cleaning air inlet plate close to the shell is larger than that of the air holes on the cleaning air inlet plate far away from the shell, so that the acid liquor condensation and dust deposition phenomena are more serious due to the fact that the temperature of the heat storage element of the rotor close to the shell is lower, and the intensity of the air beams on the cleaning air channel close to the shell is increased by increasing the number of the air holes on the cleaning air inlet plate close to the shell, and therefore the cleaning effect is improved.
In a further embodiment, the outer wall of first tuber pipe and second tuber pipe goes up the cladding and has the insulation cover, and the insulation cover can reduce the heat radiation when hot-air passes through first tuber pipe and second tuber pipe, can avoid the cold and hot deformation that the inside and outside temperature difference of first tuber pipe and second tuber pipe caused simultaneously, improves the life of first tuber pipe and second tuber pipe.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method of cleaning an air preheater having a cleaning function, the method comprising the steps of:
firstly, hot flue gas combusted by a boiler enters a flue gas channel from a flue gas inlet to heat a heat storage element on a rotor, air is blown in from a first air inlet and a second air inlet simultaneously, a driving mechanism drives the rotor to rotate, the heated energy storage element sequentially enters a first air channel and a second air channel and heats the air in the first air channel and the second air channel, the heated air enters the boiler from a first air outlet and a second air outlet through a pipeline, and meanwhile, the temperature of the heat storage element is reduced;
secondly, the second temperature sensor detects the temperature of the air at the first air outlet and transmits a first temperature signal to the information processing system in real time, when the detected temperature is higher than a set temperature, the information processing system controls the electromagnetic valve to be opened, hot air enters the cleaning air channel through the cleaning air inlet through the first air pipe, and the cooled heat storage element of the rotor rotating to the cleaning air channel is heated and washed, so that the heat storage element is cleaned;
then, hot air cleaned by the heat storage element enters the second air pipe from the cleaning air outlet, and the hot air entering the second air pipe is pressurized by the high-pressure fan and blown into the first air channel through the first air inlet so as to be mixed with cold air entering from the first air inlet, so that the temperature of the air entering the first air channel is increased, and heat collection and utilization are realized;
and finally, the first temperature sensor detects the temperature of the air at the cleaning air outlet and transmits a second temperature signal to the information processing system in real time, when the detected temperature is higher than the set temperature, the information processing system controls the electromagnetic valve to gradually reduce the flow of the hot air passing through the first air pipe, and when the detected temperature lasts for 3 minutes and keeps the set temperature, the information processing system controls the electromagnetic valve to stabilize the air flow of the first air pipe.
Has the advantages that: according to the air preheater with the cleaning function, the cleaning air duct is arranged to provide an independent space for cleaning the heat storage element, the cleaning air inlet of the cleaning air duct is connected to the first air outlet through the first air duct, the cleaning air outlet of the cleaning air duct is connected to the first air inlet through the second air duct, high-temperature air is introduced from the first air duct by the first air duct to clean the heat storage element in the cleaning air duct, acid liquor on the surface of the heat storage element is cleaned through high-temperature pyrolysis and blowing, accumulated ash condensation is reduced, the cleaned hot air enters the first air duct through the second air duct, the temperature of the air entering the first air duct is increased, and heat collection and recycling are achieved. Compared with the prior art, the invention improves the cleaning effect of the air preheater, can realize the collection and the reutilization of heat, and has simple structure and easy realization.
Drawings
FIG. 1 is a half sectional view of the structure of the present invention.
Fig. 2 is a schematic structural view of the housing of the present invention as viewed from top to bottom.
Fig. 3 is a structural schematic view of the housing of the present invention as viewed from below.
Fig. 4 is a schematic structural diagram of the present invention.
Fig. 5 is a schematic view of the structure of the cleaning air inlet plate of the present invention.
Fig. 6 is a cross-sectional view of a clean air inlet panel of the present invention.
Each of fig. 1 to 6 is labeled as: the air conditioner comprises a shell 10, a hot end 11, a flue gas inlet 111, a first air outlet 112, a second air outlet 113, a cleaning air outlet 114, a cold end 12, a flue gas outlet 121, a first air inlet 122, a second air inlet 123, a cleaning air inlet 124, a fan-shaped sealing plate 13, a cleaning air inlet plate 14, an air hole 141, a spiral groove 1411, a rotor 20, a rotating shaft 30, a first air pipe 40, a second air pipe 50, a high-pressure fan 501, a signal processing system 60, an electromagnetic valve 70, a first temperature sensor 80 and a second temperature sensor 90.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Through research and analysis of the applicant, in order to reduce the emission of NOx in coal-fired flue gas in the working process of an air preheater, a Selective Catalytic Reduction (SCR) method is mostly adopted by a coal-fired power plant to carry out denitration treatment on the flue gas, and SO is generated in the treatment process3And NH4HSO4，SO3Combined with water vapor to form sulfuric acid (H)2SO4) Steam, large amount of H2SO4The liquid drops can cause the corrosion of the air preheater and are easy to adsorb fly ash; furthermore, NH4HSO4The fly ash adhered to the surface of the heat storage element can be agglomerated into a hard block and forms ash blockage if the fly ash is not cleaned in time, the ash blockage of the air preheater threatens the safe operation of a unit, meanwhile, the heat storage and heating performances of the heat storage element are greatly reduced, the heat conversion efficiency of the air preheater is seriously reduced, and the waste of heat resources is caused.
As shown in fig. 1, the air preheater with cleaning function provided by the present invention comprises: a housing 10, a rotor 20 provided in the housing 10, and a rotating shaft 30.
Specifically, rotor 20 in this embodiment cup joints in pivot 30 and fixes, the one end and the actuating mechanism of pivot 30 are connected, actuating mechanism fixed mounting is in the frame, actuating mechanism rotates and drives pivot 30 and rotate, pivot 30 rotates and drives rotor 20 and rotate, it has a plurality of heat accumulation districts to divide through the baffle on the circumferential surface of rotor 20, set up in the heat accumulation component in every heat accumulation district, the rotational speed 2r/min of rotor 20 in this embodiment, in the in-service use, the rotational speed scope of rotor 20 is generally in 1~3r/min, the operator determines reasonable rotational speed according to air heater size and thermal conversion efficiency.
With reference to fig. 2 and 3, the housing 10 in this embodiment includes a hot end 11 and a cold end 12, where the hot end 11 and the cold end 12 are disposed opposite to each other, the hot end 11 includes a smoke inlet 111, a first air outlet 112, a second air outlet 113, and a cleaning air outlet, the smoke inlet 111 is adjacent to the first air outlet 112 and the cleaning air outlet, the second air outlet 113 is adjacent to the first air outlet 112 and the cleaning air outlet, and the shapes of the smoke inlet 111, the first air outlet 112, the second air outlet 113, and the cleaning air outlet are fan-shaped; the cold end 12 correspondingly comprises a flue gas outlet 121, a first air inlet 122, a second air inlet 123 and a cleaning air inlet, the flue gas outlet 121 is adjacent to the first air inlet 122 and the cleaning air inlet respectively, and the second air inlet 123 is adjacent to the first air inlet 122 and the cleaning air inlet respectively; a flue gas channel is formed between the flue gas inlet 111 and the flue gas outlet 121, a first air channel is formed between the first air inlet 122 and the first air outlet 112, a second air channel is formed between the second air inlet 123 and the second air outlet 113, and a cleaning air channel is formed between the cleaning air inlet and the cleaning air outlet; and fan-shaped sealing plates 13 are arranged between the smoke outlet 121 and the first air inlet 122, between the first air inlet 122 and the second air inlet 123, between the second air inlet 123 and the cleaning air inlet, between the cleaning air inlet and the smoke outlet 121, between the smoke inlet 111 and the first air outlet 112, between the first air outlet 112 and the second air outlet 113, between the second air outlet 113 and the cleaning air outlet, and between the cleaning air outlet and the smoke inlet 111.
Referring to fig. 4, the air preheater in this embodiment further includes a first air duct 40, a second air duct 50 and a signal processing system 60, wherein one end of the first air duct 40 is connected to the first air outlet 112, the other end of the first air duct 40 is connected to the cleaning air inlet 124, the first air duct 40 introduces high-temperature air from the first air outlet 112, and then introduces the high-temperature air into the cleaning air duct to clean the heat storage element in the cleaning air duct by rotating the rotor 20, so that the condensed H is condensed2SO4And NH4HSO4The liquid drops are gasified and simultaneously blow off the dust adsorbed on the heat storage element, one end of the second air pipe 50 is connected with the cleaning air outlet 114, the other end of the second air pipe 50 is connected with the first air inlet 122, and the heat storage element is cleaned and then contains evaporated H2SO4And NH4HSO4And the hot dust air is guided into the first air duct through the second air duct 50, so that the temperature of the cold air entering the first air duct from the first air inlet 122 is increased, and the collection and the reutilization of heat are realized; the first air pipe 40 is provided with an electromagnetic valve 70, the electromagnetic valve 70 controls the flow of hot air in the first air pipe 40, one end, close to the cleaning air outlet, of the second air pipe 50 is provided with a first temperature sensor 80, the first temperature sensor 80 is used for detecting the temperature of the hot air after cleaning the heat storage elements, the electromagnetic valve 70 and the first temperature sensor 80 are in communication connection with the signal processing system 60, and the signal processing system 60 can control the on-off state of the electromagnetic valve 70.
The air preheater in this embodiment further includes a second temperature sensor 90, the second temperature sensor 90 is disposed at an end of the first air duct of the casing 10 close to the first air outlet 112, and the second temperature sensor 90 is in communication connection with the signal processing system 60, air enters the first air duct from the first air inlet 122, a heat storage element at a high temperature on the rotor 20 in the flue enters the first air duct under the rotation of the rotor 20, the heat storage element and the air raise the temperature of the air through heat exchange, the temperature of the heat storage element lowers, the second temperature sensor 90 detects the temperature of the hot air at the first air outlet 112 of the first air duct and transmits a temperature signal to the signal processing system 60, and the signal processing system 60 compares the temperature signal with a set temperature to control the on-off state of the solenoid valve 70.
Because the pressure of the cold air entering the first air duct from the first air inlet 122 is greater than the pressure of the hot air in the second air duct 50, in order to prevent a large amount of cold air from entering the second air duct 50 and causing backflow of the hot air exhausted from the cleaning air outlet 114, in this embodiment, the second air duct 50 is further provided with a high pressure fan 501, the high temperature air cleaned by the heat storage element enters the second air duct 50 from the cleaning air outlet 114, the high pressure fan 501 pressurizes the hot air entering the second air duct 50, and blows the pressurized hot air into the first air duct through the first air inlet 122 to mix with the cold air entering the first air duct from the first air inlet 122, so as to increase the temperature of the air entering the first air duct, reduce the difficulty of the rotor in heating the air in the first air duct, and achieve collection and recycling of heat.
Referring to fig. 5, in a further embodiment, a cleaning air inlet of the casing 10 is provided with a cleaning air inlet plate 14, the cleaning air inlet plate 14 is shaped as a fan, and the cleaning air inlet plate 14 is connected with the inner wall of the casing 10; a plurality of air holes 141 penetrating through the cleaning air inlet plate 14 are formed between the upper end surface and the lower end surface of the cleaning air inlet plate 14, in addition, the diameter of one end, far away from the first air pipe 40, of each air hole 141 is smaller than that of one end, close to the first air pipe 40, of each air hole 141, hot air guided into the cleaning air channel from the first air pipe 40 enters the cleaning air channel from the air holes 141, and due to the fact that the diameter of one end, far away from the first air pipe 40, of each air hole is smaller than that of one.
In a further embodiment, with reference to fig. 6, the inner wall of the air hole 141 is provided with a spiral groove 1411 taking the central axis of the air hole 141 as the rotation axis 30, when the hot air passes through the air hole 141, the hot air is guided by the spiral groove 1411 to rotate, so as to form a rotating wind beam, the rotating wind beam has both vertical and oblique impact forces, the heat storage element is cleaned from multiple angles, and the cleaning effect of the air preheater is further improved.
In another embodiment of this embodiment, the central axis of the air holes 141 and the upper and lower end surfaces of the cleaning air inlet plate 14 have a predetermined inclination angle, so that the hot air is guided into an oblique wind bundle when passing through the air holes 141, and the oblique wind velocity can clean the heat storage element from the bottom and the side.
Since the heat storage element on the side of the rotor 20 close to the casing 10 is more easily cooled, H is most easily caused2SO4And NH4HSO4In a further embodiment, the number of the air holes 141 on the cleaning air inlet plate 14 close to the side of the casing 10 is greater than that of the air holes on the side far from the casing 10, so that the air beams in the cleaning air duct close to the side of the casing 10 are more concentrated, and the cleaning effect is correspondingly improved.
In a further embodiment, the outer walls of the first air duct 40 and the second air duct 50 are wrapped with insulation sleeves, the insulation sleeves are mainly made of insulation cotton, and the insulation cotton is a non-toxic, harmless and pollution-free insulation material, has certain environmental protection performance and is friendly to people; through setting up the heat insulating sleeve can reduce the heat radiation when hot-air passes through first tuber pipe 40 and second tuber pipe 50, reduce calorific loss, simultaneously, utilize the heat insulating sleeve can avoid the cold and hot deformation that the inside and outside temperature difference of first tuber pipe 40 and second tuber pipe 50 caused, ensure the life of first tuber pipe 40 and second tuber pipe 50.
The invention provides a cleaning method of an air preheater with a cleaning function, which mainly comprises the following steps:
firstly, hot flue gas combusted by a boiler enters a flue gas channel from a flue gas inlet 111 to heat a heat storage element on a rotor 20, air is blown in from a first air inlet 122 and a second air inlet 123, a driving mechanism drives the rotor 20 to rotate, the heated energy storage element sequentially enters a first air channel and a second air channel, the temperature of the air in the first air channel and the temperature of the air in the second air channel are increased through heat exchange between the heat storage element and the air, meanwhile, the temperature of the heat storage element is reduced, the heated hot air is discharged from the first air outlet and the second air outlet and then enters the boiler through a pipeline, and the coal in the boiler is preheated and dried;
secondly, the second temperature sensor 90 detects the temperature of the air at the first air outlet 112, and transmits a first temperature signal to the information processing system in real time, when the detected temperature is higher than a set temperature, the information processing system controls the solenoid valve 70 to be opened, hot air enters the cleaning air duct from the cleaning air inlet through the guidance of the first air pipe 40, and the cooled heat storage element in the cleaning air duct after the rotor 20 rotates is heated and washed, so that the heat storage element is cleaned;
then, the hot air cleaned by the heat storage element enters the second air duct 50 from the cleaning air outlet 114, and the high-pressure fan 501 pressurizes the hot air entering the second air duct 50 and blows the hot air into the first air duct through the first air inlet 122, so that the hot air is mixed with the cold air entering from the first air inlet 122, and the temperature of the air entering the first air duct is increased;
finally, the first temperature sensor 80 detects the temperature of the air at the cleaning air outlet and transmits a second temperature signal to the information processing system in real time, when the detected temperature is greater than the set temperature, the information processing system controls the electromagnetic valve 70 to gradually reduce the flow of the hot air passing through the first air duct 40, and when the detected temperature lasts for 3 minutes and maintains the set temperature, the information processing system controls the electromagnetic valve 70 to be constant, so that the air flow of the first air duct 40 is stable.
According to the air preheater with the cleaning function, the cleaning air duct is arranged to provide an independent space for cleaning the heat storage element, wherein the cleaning air inlet of the cleaning air duct is connected with the first air outlet 112 through the first air duct 40, the cleaning air outlet of the cleaning air duct is connected with the first air inlet through the second air duct 50, high-temperature air is introduced from the first air duct by the first air duct 40 to clean the heat storage element in the cleaning air duct, acid liquor on the surface of the heat storage element is cleaned through high-temperature pyrolysis and blowing, ash deposition and condensation are reduced, the cleaned hot air enters the first air duct through the second air duct 50, the temperature of cold air entering the first air duct from the first air inlet 122 is increased, the difficulty of heating the air in the first air duct by the rotor is reduced, and heat collection and recycling are achieved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. An air preheater with a cleaning function, comprising: the shell, locate rotor and pivot in the casing, the fixed cover of rotor connects in the pivot, the one end of pivot is connected with the actuating mechanism who is fixed in the frame, its characterized in that, the casing includes relative hot junction and cold junction that sets up, the hot junction includes flue gas inlet, first air outlet, second air outlet and clearance air outlet in proper order, the cold junction correspondence includes exhanst gas outlet, first air intake, second air intake and clearance air intake, be formed with the flue gas duct between flue gas inlet and the exhanst gas outlet, form first wind channel between first air intake and the first air outlet, form the second wind channel between second air intake and the second air outlet, form the clearance wind channel between clearance air intake and the clearance air outlet, flue gas outlet and first air intake, first air intake and second air intake, second air intake and clearance air intake, Fan-shaped sealing plates are arranged between the cleaning air inlet and the flue gas outlet, between the flue gas inlet and the first air outlet, between the first air outlet and the second air outlet, between the second air outlet and the cleaning air outlet, and between the cleaning air outlet and the flue gas inlet;
a cleaning air inlet plate is arranged at a cleaning air inlet of the shell, a plurality of air holes penetrating through the cleaning air inlet plate are formed in the upper end surface and the lower end surface of the cleaning air inlet plate, and the diameter of one end, far away from the first air pipe, of each air hole is smaller than that of one end, close to the first air pipe, of each air hole;
the air preheater further comprises a first air pipe, a second air pipe and a signal processing system, wherein one end of the first air pipe is connected with a first air outlet, the other end of the first air pipe is connected with a cleaning air inlet, one end of the second air pipe is connected with the cleaning air outlet, the other end of the second air pipe is connected with the first air inlet, the first air pipe is provided with an electromagnetic valve, one end of the second air pipe, which is close to the cleaning air outlet, is provided with a first temperature sensor, and the electromagnetic valve and the first temperature sensor are in communication connection with the signal processing system; the outer walls of the first air pipe and the second air pipe are wrapped with heat insulation sleeves;
the air preheater also comprises a second temperature sensor, the second temperature sensor is arranged at one end, close to the first air outlet, of the inner wall of the shell, and the second temperature sensor is in communication connection with the signal processing system;
and the second air pipe is also provided with a high-pressure fan for introducing hot air exhausted from the cleaning air outlet into the first air channel.
2. An air preheater as recited in claim 1, wherein said air holes have spiral grooves formed in an inner wall thereof with a center axis of the air holes being a rotational axis.
3. An air preheater as recited in claim 1, wherein said air holes have a predetermined angle of inclination between a central axis thereof and upper and lower end surfaces of said clean air inlet plate.
4. An air preheater as recited in claim 1, wherein the number of air holes in said clean air inlet panel is greater on the side closer to the housing than on the side farther from the housing.
5. A method of cleaning an air preheater having a cleaning function, the method comprising the steps of:
step 1: hot flue gas combusted by the boiler enters the flue gas channel from the flue gas inlet to heat the heat storage element on the rotor, air is blown in from the first air inlet and the second air inlet at the same time, the driving mechanism drives the rotor to rotate, the heated energy storage element sequentially enters the first air channel and the second air channel and heats the air in the first air channel and the second air channel, the heated air enters the boiler from the first air outlet and the second air outlet through the pipelines, and meanwhile, the temperature of the heat storage element is reduced;
step 2: the second temperature sensor detects the temperature of air at the first air outlet and transmits a first temperature signal to the information processing system in real time, when the detected temperature is higher than a set temperature, the information processing system controls the electromagnetic valve to be opened, hot air enters the cleaning air channel through the cleaning air inlet through the first air pipe, and the cooled heat storage element in the cleaning air channel after the rotor rotates is heated and washed, so that the heat storage element is cleaned;
and step 3: hot air cleaned by the heat storage element enters the second air pipe from the cleaning air outlet, and the hot air entering the second air pipe is pressurized by the high-pressure fan and blown into the first air channel through the first air inlet so as to be mixed with cold air entering from the first air inlet, so that the temperature of the air entering the first air channel is increased, and heat collection and utilization are realized;
and 4, step 4: the first temperature sensor detects the temperature of the air at the cleaning air outlet and transmits a second temperature signal to the information processing system in real time, when the detected temperature is higher than a set temperature, the information processing system controls the electromagnetic valve to gradually reduce the flow of the hot air passing through the first air pipe, and when the detected temperature lasts for 3 minutes and keeps the set temperature, the information processing system controls the electromagnetic valve to stabilize the air flow of the first air pipe.
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| CN201910773694.5A CN110513713B (en) | 2019-08-21 | 2019-08-21 | Rotary air preheater with cleaning function and cleaning method thereof |
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| CN110513713A (en) | 2019-11-29 |
| CN112460627B (en) | 2023-03-17 |
| CN110513713B (en) | 2020-12-04 |
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