CN108413439B - Device and method for adjusting temperature of flue gas at outlet of air preheater with four bins - Google Patents
Device and method for adjusting temperature of flue gas at outlet of air preheater with four bins Download PDFInfo
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- CN108413439B CN108413439B CN201810367509.8A CN201810367509A CN108413439B CN 108413439 B CN108413439 B CN 108413439B CN 201810367509 A CN201810367509 A CN 201810367509A CN 108413439 B CN108413439 B CN 108413439B
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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
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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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 provides a device and a method for adjusting the temperature of flue gas at an outlet of a four-compartment air preheater, wherein the four-compartment air preheater is provided with a flue gas pipeline, the flue gas pipeline is provided with a flue gas channel and a cold air channel which are arranged at intervals, the cold air channel is provided with a left secondary air channel, a primary air channel and a right secondary air channel which are arranged at intervals in sequence, and the device for adjusting the temperature of flue gas at the outlet of the four-compartment air preheater is arranged on the flue gas pipeline and comprises the following components: the first temperature adjusting mechanism is provided with a first pipeline and a first air heater connected to the first pipeline, and the first air heater is connected with the left secondary air channel through the first pipeline; the second temperature adjusting mechanism is provided with a second pipeline and a second air heater connected to the second pipeline, and the second air heater is connected with the right secondary air channel through the second pipeline; and the smoke exhaust channel is connected with the smoke exhaust channel. The invention achieves the purpose of reducing the temperature difference at two sides of the smoke exhaust channel by adjusting the temperature of cold air which is introduced into the left secondary air channel and the right secondary air channel, and has simple structure and convenient operation and adjustment.
Description
Technical Field
The invention relates to the technical field of coal-fired boilers, in particular to a device and a method for adjusting the temperature of flue gas at an outlet of a quarter-bin air preheater.
Background
Along with the improvement of the electric power technology and the manufacturing level of auxiliary machines, the reliability and the availability of the auxiliary machines are higher and higher, and the unit adopts the single-row arrangement of the auxiliary machines, so that the unit becomes a new development trend due to the advantages of small occupied area, low engineering cost, convenient overhaul and maintenance, high equipment efficiency and the like.
In recent years, the single-row arrangement of auxiliary machines is researched and explored, and at present, the number of units adopting the single-row arrangement of the auxiliary machines in China is gradually increased, and the units adopting the single-row arrangement of the auxiliary machines are adopted in air cooling, water cooling or pure condensing or heat supply units. The unit adopting auxiliary machine single-row arrangement comprises an air preheater, a quarter-bin arrangement mode is adopted, the size of the unit is larger than that of the air preheater adopting double-row arrangement of the same level, and some units are even independently customized.
The heat transfer of the air preheater is realized through a heat storage element in the air preheater, the heat in the hot flue gas is transferred to the heat storage element in the air preheater, and cold air (comprising cold primary air and cold secondary air) entering the air preheater is transferred to the air preheater along with the rotation of the heat storage element, the cold air absorbs the heat and becomes hot air, and the hot flue gas releases the heat and becomes cold flue gas. Due to the heat transfer characteristics of the heat storage element of the air preheater, the exhaust gas temperature of the section of the flue gas channel of the air preheater has certain deviation, and the deviation is more obvious along with the increase of the size of the air preheater. For example, a 660MW ultra-supercritical unit adopts an auxiliary unit single-row arrangement mode, and the exhaust temperature deviation of the outlet of the air preheater of the four-component bin reaches 30 ℃ when the unit is at full load. The deviation of the exhaust gas temperature at the outlet of the air preheater can influence the temperature distribution of a rear flue, so that the temperature distribution of a dust remover is influenced, and the uneven temperature distribution of the dust remover can lead to uneven temperatures of equipment elements such as filter bags, polar plates and the like, so that the service life of the equipment elements is damaged or destroyed, and the operation safety of the equipment is seriously influenced.
Disclosure of Invention
The invention aims to provide a device and a method for adjusting the temperature of flue gas at the outlet of a quaternary bin air preheater, which achieve the purpose of reducing the temperature difference at two sides of a smoke discharging channel of the flue gas channel of the air preheater by adjusting the temperature of cold air of a left secondary air channel and a right secondary air channel of a flue gas channel of the quaternary bin air preheater.
The above object of the present invention can be achieved by the following technical solutions:
the invention provides a device for adjusting the temperature of flue gas at the outlet of a four-compartment air preheater, which is provided with a flue gas pipeline, wherein the flue gas pipeline is provided with a flue gas channel and a cold air channel which are arranged at intervals, the cold air channel is provided with a left secondary air channel, a primary air channel and a right secondary air channel which are arranged at intervals in sequence, and the device for adjusting the temperature of flue gas at the outlet of the four-compartment air preheater is arranged on the flue gas pipeline and comprises the following components:
the first temperature adjusting mechanism is provided with a first pipeline and a first air heater connected to the first pipeline, and the first air heater is connected with the left secondary air channel through the first pipeline;
the second temperature adjusting mechanism is provided with a second pipeline and a second air heater connected to the second pipeline, and the second air heater is connected with the right secondary air channel through the second pipeline;
and the smoke exhaust channel is connected with the smoke exhaust channel.
In an embodiment of the invention, a first valve is connected to the first pipeline, and the first valve is located between the first heater and the left secondary air channel.
In an embodiment of the invention, a second valve is connected to the second pipeline, and the second valve is located between the second heater and the right secondary air channel.
In an embodiment of the present invention, the temperature change amount of the first cold air flowing into the first pipeline after passing through the first air heater is Δt1, the temperature change amount of the second cold air flowing into the second pipeline after passing through the second air heater is Δt2, the flow rate of the flue gas discharged from the flue gas channel is Q3, the temperature change amount of the flue gas in the flue gas channel near the first pipeline is Δt3, and the temperature change amount of the flue gas in the flue gas channel near the second pipeline is Δt4; in a state where the air volume Q1 of the first cold air introduced into the left secondary air duct is the same as the air volume Q2 of the second cold air introduced into the right secondary air duct, there are: (Δt1+Δt2) ×q1= (Δt3+Δt4) ×q3/2.
In an embodiment of the present invention, when the amount of change in the air volume of the first cold air flowing into the first duct after passing through the first damper is Δq4, the amount of change in the air volume of the second cold air flowing into the second duct after passing through the second damper is Δq5, the flow rate of flue gas discharged from the flue gas duct is Q3, the amount of change in the flue gas temperature of the flue gas duct on the side close to the first duct is Δt3, the amount of change in the flue gas temperature of the flue gas duct on the side close to the second duct is Δt4, and the temperature T1 of the first cold air flowing into the left secondary duct is the same as the temperature T2 of the second cold air flowing into the right secondary duct, and the amount of change in the flue gas flow rate Δq4 is the same as the amount of change in the flue gas flow rate Δq5, there is: (t1+t2) ×Δq4= (Δt3+Δt4) ×q3/2.
The invention also provides a method for adjusting the temperature of the flue gas at the outlet of the air preheater with the adoption of the device for adjusting the temperature of the flue gas at the outlet of the air preheater with the four bins, which comprises the following steps:
step S1: adjusting the air quantity of the first cold air flowing into the left secondary air channel and the air quantity of the second cold air flowing into the right secondary air channel to enable the air quantity of the first cold air flowing into the left secondary air channel to be the same as the air quantity of the second cold air flowing into the right secondary air channel;
step S2: and respectively adjusting the temperature of the first cold air introduced into the left secondary air channel and the temperature of the second cold air introduced into the right secondary air channel according to the temperature difference of the two sides of the smoke discharging channel.
In the embodiment of the present invention, in the step S2, when the temperature difference between the two sides of the smoke exhaust channel is greater than or equal to 5 ℃, the temperature of the first cold air introduced into the left secondary air channel and the temperature of the second cold air introduced into the right secondary air channel are respectively adjusted.
In an embodiment of the present invention, in a state where the temperature of the flue gas channel near the first pipe is higher than the temperature of the flue gas channel near the second pipe, the temperature of the first cool air introduced into the left secondary air channel is decreased, and the temperature of the second cool air introduced into the right secondary air channel is increased.
In an embodiment of the present invention, in a state where the temperature of the flue gas channel near the first pipe is lower than the temperature of the flue gas channel near the second pipe, the temperature of the first cool air introduced into the left secondary air channel is increased, and the temperature of the second cool air introduced into the right secondary air channel is decreased.
The invention also provides a method for adjusting the temperature of the flue gas at the outlet of the air preheater with the adoption of the device for adjusting the temperature of the flue gas at the outlet of the air preheater with the four bins, which comprises the following steps:
step S3: adjusting the temperature of the first cold air introduced into the left secondary air channel and the temperature of the second cold air introduced into the right secondary air channel to enable the temperature of the first cold air introduced into the left secondary air channel to be the same as the temperature of the second cold air introduced into the right secondary air channel;
step S4: and respectively adjusting the air quantity change quantity of the first cold air introduced into the left secondary air channel and the air quantity change quantity of the second cold air introduced into the right secondary air channel according to the temperature difference of the two sides of the smoke discharging channel.
In the embodiment of the present invention, in the step S4, when the temperature difference between the two sides of the smoke exhaust passage is greater than or equal to 5 ℃, the air volume change amount of the first cold air introduced into the left secondary air passage and the air volume change amount of the second cold air introduced into the right secondary air passage are respectively adjusted.
In an embodiment of the present invention, in a state where the temperature of the flue gas channel near the first pipe is higher than the temperature of the flue gas channel near the second pipe, the air volume of the first cool air introduced into the left secondary air channel is increased, and the air volume of the second cool air introduced into the right secondary air channel is decreased.
In an embodiment of the present invention, in a state where the temperature of the flue gas channel near the first pipe is lower than the temperature of the flue gas channel near the second pipe, the air volume of the first cool air introduced into the left secondary air channel is reduced, and the air volume of the second cool air introduced into the right secondary air channel is increased.
The device and the method for adjusting the temperature of the flue gas at the outlet of the air preheater with the four bins have the characteristics and advantages that: the invention can reduce the temperature deviation at two sides of the smoke exhaust channel of the smoke air pipeline of the four-compartment air preheater, further ensure that the temperature distribution of smoke in the smoke channel and equipment behind the air preheater is more uniform, reduce the influence of larger temperature deviation on the service life of the equipment, and improve the safety and economy of the system operation.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the device for adjusting the temperature of the flue gas at the outlet of the air preheater with four bins.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one
As shown in fig. 1, the present invention provides a device for adjusting the temperature of flue gas at the outlet of a quarter-bin air preheater, the quarter-bin air preheater has a flue gas duct 1, the flue gas duct 1 has a flue gas duct 11 and a cold air duct 12 which are arranged at intervals, the cold air duct 12 has a left secondary air duct 121, a primary air duct 122 and a right secondary air duct 123 which are arranged at intervals in sequence, and the device for adjusting the temperature of flue gas at the outlet of the quarter-bin air preheater is mounted on the flue gas duct 1, and comprises:
a first temperature adjusting mechanism 2 having a first pipe 21 and a first heater 22 connected to the first pipe 21, the first heater 22 being connected to the left secondary air duct 121 through the first pipe 21;
a second temperature adjusting mechanism 3 having a second pipe 31 and a second heater 32 connected to the second pipe 31, the second heater 32 being connected to the right secondary air duct 123 through the second pipe 31;
and a smoke exhaust passage 4 connected to the smoke exhaust passage 11.
Specifically, in the present invention, the temperature variation of the first cold air flowing into the first pipeline 21 after passing through the first air heater 22 is Δt1, the temperature variation of the second cold air flowing into the second pipeline 31 after passing through the second air heater 32 is Δt2, the flow rate of the flue gas discharged from the flue gas channel 4 is Q3, the temperature variation of the flue gas in the flue gas channel 4 near the first pipeline 21 is Δt3, and the temperature variation of the flue gas in the flue gas channel 4 near the second pipeline 31 is Δt4; in a state where the air volume Q1 of the first cool air introduced into the left secondary air duct 121 is the same as the air volume Q2 of the second cool air introduced into the right secondary air duct 123, there are: (Δt1+Δt2) ×q1= (Δt3+Δt4) ×q3/2.
Assuming that the temperature of the first cold air flowing into the first pipeline 21 is T1', and the temperature of the first cold air after passing through the first air heater 22 is T1, Δt1= |t1-T1' |; meanwhile, assuming that the temperature of the second cold air introduced into the second pipeline 31 is T2', and the temperature of the second cold air after passing through the second heater 32 is T2, Δt2= |t2-T2' |. In the present invention, the smoke temperature of the smoke evacuation path 4 on the side close to the first duct 21 is T3, and the smoke temperature of the smoke evacuation path 4 on the side close to the second duct 31 is T4.
In the embodiment of the present invention, when the temperature difference of the flue gas at both sides of the flue gas discharging passage 4 is less than 5 ℃, that is, |t3-t4| < 5 ℃, the deviation between the opening degree of the inlet throttle 221 of the first air heater 22 and the opening degree of the inlet throttle 321 of the second air heater 32 should be made to be less than 5% to ensure that the temperature T1 of the first cool air entering the left secondary air passage 121 and the temperature T2 of the second cool air entering the right secondary air passage 123 through the first air heater 22 and the second air heater 32, respectively, are substantially identical.
In the embodiment of the present invention, when the temperature difference of the flue gas at both sides of the flue gas discharging channel 4 is greater than or equal to 5 ℃, that is, |t3-t4|gtoreq 5 ℃, the temperature T1 of the first cool air entering the left secondary air channel 121 and the temperature T2 of the second cool air entering the right secondary air channel 123 through the first warm air device 22 and the second warm air device 32 are changed by controlling the opening of the inlet throttle 221 of the first warm air device 22 and the opening of the inlet throttle 321 of the second warm air device 32, respectively, thereby affecting the temperature of the flue gas at both sides of the flue gas discharging channel 4.
Specifically, in a possible embodiment, when the flue gas temperature T3 is greater than the flue gas temperature T4, the inlet throttle 221 of the first air heater 22 is turned off, and the inlet throttle 321 of the second air heater 32 is turned on, so that the temperature T1 of the first cold air entering the left secondary air duct 121 is smaller than the temperature T2 of the second cold air entering the right secondary air duct 123, and at this time, the flue gas cooling effect of the flue gas channel 4 near the side of the first duct 21 is better, thereby achieving the purpose of reducing the flue gas temperature T3.
In another possible embodiment, when the flue gas temperature T3 is less than the flue gas temperature T4, the inlet throttle 221 of the first air heater 22 is opened, the inlet throttle 321 of the second air heater 32 is closed, so that the temperature T1 of the first cold air entering the left secondary air channel 121 is greater than the temperature T2 of the second cold air entering the right secondary air channel 123, and at this time, the flue gas cooling effect of the flue gas channel 4 near the side of the second pipeline 31 is better, thereby achieving the purpose of reducing the flue gas temperature T4.
According to one embodiment of the present invention, a first damper 23 is further connected to the first pipeline 21, the first damper 23 is located between the first air heater 22 and the left secondary air duct 121, and the first damper 23 is used for adjusting the air intake of cold air introduced into the left secondary air duct 121 from the first pipeline 21. Further, a second damper 33 is further connected to the second pipe 31, the second damper 33 is located between the second air heater 32 and the right secondary air duct 123, and the second damper 33 is used for adjusting the air intake of the cold air introduced into the right secondary air duct 123 from the second pipe 31.
Specifically, the first pipe 21 and the second pipe 31 are connected to the blower 5, respectively, and the purpose of feeding cool air is achieved by the blower 5. In the present invention, when the amount of change in the air volume of the first cold air flowing into the first duct 21 after passing through the first damper 23 is Δq4, the amount of change in the air volume of the second cold air flowing into the second duct 31 after passing through the second damper 33 is Δq5, the flow rate of the flue gas discharged from the flue gas duct 4 is Q3, the amount of change in the flue gas temperature of the flue gas duct 4 on the side close to the first duct 21 is Δt3, the amount of change in the flue gas temperature of the flue gas duct 4 on the side close to the second duct 31 is Δt4, the temperature T1 of the first cold air flowing into the left secondary duct 121 is the same as the temperature T2 of the second cold air flowing into the right secondary duct 123, and the amount of change in the flue gas flow rate Δq4 is the same as the amount of change in the flue gas flow rate Δq5: (t1+t2) ×Δq4= (Δt3+Δt4) ×q3/2.
In the embodiment of the present invention, when the deviation between the flue gas temperature T3 and the flue gas temperature T4 at both sides of the flue gas channel 4 is less than 5 ℃, that is, |t3-t4| < 5 ℃, the opening degrees of the first and second dampers 23 and 33 should be kept unchanged at present, and at this time, the air quantity Q1 of the first cool air introduced into the first pipeline 21 and the air quantity Q2 of the second cool air introduced into the second pipeline 31 are kept unchanged.
In the embodiment of the present invention, when the deviation of the smoke temperature T3 and the smoke temperature T4 at both sides of the smoke discharging passage 4 is greater than or equal to 5 ℃, i.e., |t3-t4|gtoreq 5 ℃, the air quantity Q1 of the first cool air passing through the left secondary air passage 121 and the air quantity Q2 of the second cool air passing through the right secondary air passage 123 are changed by controlling the opening of the first damper 23 and the opening of the second damper 33, thereby affecting the smoke temperature T3 and the smoke temperature T4 at both sides of the smoke discharging passage 4.
Specifically, in a possible embodiment, when the flue gas temperature T3 is greater than the flue gas temperature T4, the first damper 23 is opened to increase the air volume Q1 of the first cold air flowing into the left secondary air duct 121, and the second damper 33 is closed to decrease the air volume Q2 of the second cold air flowing into the right secondary air duct 123, so that the flue gas cooling effect of the flue gas channel 4 near the side of the first duct 21 is better, and the purpose of reducing the flue gas temperature T3 is achieved.
In another possible embodiment, when the flue gas temperature T3 is less than the flue gas temperature T4, the first damper 23 is turned off to reduce the air volume Q1 of the first cold air flowing into the left secondary air channel 121, and the second damper 33 is turned on to increase the air volume Q2 of the second cold air flowing into the right secondary air channel 123, at this time, the flue gas cooling effect of the flue gas channel 4 near the side of the second pipeline 31 is better, so as to achieve the purpose of reducing the flue gas temperature T4.
The device for adjusting the temperature of the flue gas at the outlet of the air preheater with the four bins can reduce the temperature deviation at two sides of the flue gas channel 4 of the flue gas pipeline 1 of the air preheater with the four bins, so that the flue gas temperature distribution in the flue and the equipment behind the air preheater is more uniform, the influence of the larger temperature deviation on the service life of the equipment is reduced, and the safety and the economical efficiency of the system operation are improved.
Second embodiment
As shown in fig. 1, the present invention further provides a method for adjusting the temperature of the flue gas at the outlet of the air preheater in the fourth compartment, which adopts the device for adjusting the temperature of the flue gas at the outlet of the air preheater in the first embodiment, and the structure, the working principle and the beneficial effects of the device are the same as those of the first embodiment, and are not described in detail herein, and the method includes the following steps:
step S1: adjusting the air quantity Q1 of the first cold air flowing into the left secondary air channel 121 and the air quantity Q2 of the second cold air flowing into the right secondary air channel 123;
step S2: according to the temperature difference between the two sides of the smoke exhaust channel 4, the temperature T1 of the first cold air flowing into the left secondary air channel 121 and the temperature T2 of the second cold air flowing into the right secondary air channel 123 are respectively adjusted.
In the present invention, step S2 is performed in a state that the air volume Q1 of the first cold air introduced into the left secondary air duct 121 is the same as the air volume Q2 of the second cold air introduced into the right secondary air duct 123, and in step S2, when the temperature difference between both sides of the smoke discharging duct 4 is greater than or equal to 5 ℃, that is, when |t3-t4|is greater than or equal to 5 ℃, the temperature T1 of the first cold air introduced into the left secondary air duct 121 and the temperature T2 of the second cold air introduced into the right secondary air duct 123 are respectively adjusted.
Specifically, in a possible embodiment, in a state where the smoke temperature T3 of the smoke evacuation channel 4 near the first duct 21 side is greater than the smoke temperature T4 of the smoke evacuation channel 4 near the second duct 31 side, the temperature T1 of the first cool air introduced into the left secondary air duct 121 is decreased, and the temperature T2 of the second cool air introduced into the right secondary air duct 123 is increased.
That is, when T3 > T4, the inlet throttle 221 of the first air heater 22 is turned off, and the inlet throttle 321 of the second air heater 32 is turned on to make the temperature T1 of the first cold air entering the left secondary air duct 121 smaller than the temperature T2 of the second cold air entering the right secondary air duct 123, and at this time, the flue gas cooling effect of the flue gas channel 4 near the first duct 21 is better, so as to achieve the purpose of reducing the flue gas temperature T3.
In another possible embodiment, in a state where the temperature T3 of the smoke evacuation channel 4 near the first duct 21 side is smaller than the temperature T4 of the smoke evacuation channel 4 near the second duct 31 side, the temperature T1 of the first cool air introduced into the left secondary duct 121 is increased, and the temperature T2 of the second cool air introduced into the right secondary duct 123 is decreased.
That is, when T3 < T4, the inlet throttle 221 of the first air heater 22 is opened, the inlet throttle 321 of the second air heater 32 is closed, so that the temperature T1 of the first cold air entering the left secondary air duct 121 is greater than the temperature T2 of the second cold air entering the right secondary air duct 123, and at this time, the flue gas cooling effect of the flue gas channel 4 near the second pipe 31 is better, thereby achieving the purpose of reducing the flue gas temperature T4.
In the present invention, when the temperature difference of the flue gas at both sides of the flue gas discharging passage 4 is less than 5 ℃, i.e., |t3-t4| < 5 ℃, the deviation of the opening degrees of the inlet throttle 221 of the first air heater 22 and the inlet throttle 321 of the second air heater 32 should be less than 5% to ensure that the temperature T1 of the first cool air entering the left secondary air passage 121 and the temperature T2 of the second cool air entering the right secondary air passage 123 through the first air heater 22 and the second air heater 32 are substantially identical, respectively.
The method for adjusting the temperature of the flue gas at the outlet of the air preheater with the four bins can reduce the temperature deviation at two sides of the flue gas channel 4 of the flue gas pipeline 1 of the air preheater with the four bins, so that the flue gas temperature distribution in the flue and the equipment behind the air preheater is more uniform, the influence of the larger temperature deviation on the service life of the equipment is reduced, and the safety and the economical efficiency of the system operation are improved.
Embodiment III
As shown in fig. 1, the present invention further provides a method for adjusting the temperature of the flue gas at the outlet of the air preheater in the fourth compartment, which adopts the device for adjusting the temperature of the flue gas at the outlet of the air preheater in the first embodiment, and the structure, the working principle and the beneficial effects of the device are the same as those of the first embodiment, and are not described in detail herein, and the method includes the following steps:
step S3: adjusting the temperature T1 of the first cold air flowing into the left secondary air channel 121 and the temperature T2 of the second cold air flowing into the right secondary air channel 123 to enable the temperature T1 of the first cold air flowing into the left secondary air channel 121 to be the same as the temperature T2 of the second cold air flowing into the right secondary air channel 123;
step S4: according to the temperature difference at two sides of the smoke discharging channel 4, the air quantity change quantity delta Q4 of the first cold air flowing into the left secondary air channel 121 and the air quantity change quantity delta Q5 of the second cold air flowing into the right secondary air channel 123 are respectively adjusted.
In the present invention, in step S4, when the temperature difference between both sides of the smoke exhaust duct 4 is equal to or greater than 5 ℃, the air volume change Δq4 of the first cool air introduced into the left secondary air duct 121 and the air volume change Δq5 of the second cool air introduced into the right secondary air duct 123 are respectively adjusted.
Specifically, in a possible embodiment, in a state where the smoke temperature T3 of the smoke evacuation channel 4 near the first pipe 21 side is greater than the smoke temperature T4 of the smoke evacuation channel 4 near the second pipe 31 side, the air volume of the first cool air introduced into the left secondary air channel 121 is increased, and the air volume of the second cool air introduced into the right secondary air channel 123 is decreased.
That is, when T3 > T4, the first damper 23 is opened to increase the air volume Q1 of the first cool air flowing into the left secondary air duct 121, and the second damper 33 is closed to decrease the air volume Q2 of the second cool air flowing into the right secondary air duct 123, and at this time, the smoke exhaust cooling effect of the smoke exhaust duct 4 near the first duct 21 side is better, thereby achieving the purpose of reducing the smoke temperature T3.
In another possible embodiment, in a state where the smoke temperature T3 of the smoke evacuation channel 4 near the first duct 21 side is smaller than the smoke temperature T4 of the smoke evacuation channel 4 near the second duct 31 side, the air volume of the first cool air introduced into the left secondary air duct 121 is reduced, and the air volume of the second cool air introduced into the right secondary air duct 123 is increased.
That is, when T3 < T4, the first damper 23 is turned off to reduce the air volume Q1 of the first cold air flowing into the left secondary air duct 121, and the second damper 33 is turned on to increase the air volume Q2 of the second cold air flowing into the right secondary air duct 123, and at this time, the smoke exhaust cooling effect of the smoke exhaust duct 4 near the second duct 31 is better, so as to achieve the purpose of reducing the smoke temperature T4.
In the present invention, when the deviation between the flue gas temperature T3 and the flue gas temperature T4 at both sides of the flue gas channel 4 is less than 5 ℃, that is, |t3-t4| < 5 ℃, the opening degrees of the first and second dampers 23 and 33 should be kept unchanged at present, and at this time, the air volume Q1 of the first cold air introduced into the first pipeline 21 and the air volume Q2 of the second cold air introduced into the second pipeline 31 are kept unchanged.
The method for adjusting the temperature of the flue gas at the outlet of the air preheater with the four bins can reduce the temperature deviation at two sides of the flue gas channel 4 of the flue gas pipeline 1 of the air preheater with the four bins, so that the flue gas temperature distribution in the flue and the equipment behind the air preheater is more uniform, the influence of the larger temperature deviation on the service life of the equipment is reduced, and the safety and the economical efficiency of the system operation are improved.
The foregoing is merely a few embodiments of the present invention and those skilled in the art may make various modifications or alterations to the embodiments of the present invention in light of the disclosure herein without departing from the spirit and scope of the invention.
Claims (3)
1. The utility model provides a device of adjustment quartering storehouse air heater export flue gas temperature, the quartering storehouse air heater has the flue gas pipeline, flue gas pipeline has flue gas passageway and the cold wind passageway that the interval set up, the cold wind passageway has left secondary air way, primary air way and the right secondary air way that the interval set up in proper order, its characterized in that, the device of adjustment quartering storehouse air heater export flue gas temperature is installed on the flue gas pipeline, it includes:
the first temperature adjusting mechanism is provided with a first pipeline and a first air heater connected to the first pipeline, and the first air heater is connected with the left secondary air channel through the first pipeline;
the second temperature adjusting mechanism is provided with a second pipeline and a second air heater connected to the second pipeline, and the second air heater is connected with the right secondary air channel through the second pipeline;
a smoke exhaust passage connected to the smoke passage;
the first pipeline is connected with a first regulating valve, and the first regulating valve is positioned between the first air heater and the left secondary air channel;
the second pipeline is connected with a second regulating valve, and the second regulating valve is positioned between the second air heater and the right secondary air channel;
the temperature change amount of the first cold air which is introduced into the first pipeline after passing through the first air heater is equal to T1, the temperature change amount of the second cold air which is introduced into the second pipeline after passing through the second air heater is equal to T2, the smoke flow discharged from the smoke discharging channel is Q3, the smoke temperature change amount of the smoke discharging channel near one side of the first pipeline is equal to T3, and the smoke temperature change amount of the smoke discharging channel near one side of the second pipeline is equal to T4; in a state where the air volume Q1 of the first cold air introduced into the left secondary air duct is the same as the air volume Q2 of the second cold air introduced into the right secondary air duct, there are: (+t1+ +t2) ×q1= (+t4) ×q3/2;
the air volume change amount of the first cold air flowing into the first pipeline after passing through the first regulating gate is equal to Q4, the air volume change amount of the second cold air flowing into the second pipeline after passing through the second regulating gate is equal to Q5, the flue gas flow discharged from the flue gas channel is equal to Q3, the flue gas temperature change amount of the flue gas channel near one side of the first pipeline is equal to T3, the flue gas temperature change amount of the flue gas channel near one side of the second pipeline is equal to T4, and when the temperature T1 of the first cold air flowing into the left secondary air channel is equal to the temperature T2 of the second cold air flowing into the right secondary air channel and the flue gas flow change amount equal to Q4 and the flue gas flow change amount equal to Q5, the following steps are provided: (t1+t2) fatter q4= (+t3+t4) ×q3/2.
2. A method for adjusting the temperature of flue gas at the outlet of a four-compartment air preheater, characterized in that a device for adjusting the temperature of flue gas at the outlet of a four-compartment air preheater as set forth in claim 1 is used, said method comprising the steps of:
step S1: adjusting the air quantity of the first cold air flowing into the left secondary air channel and the air quantity of the second cold air flowing into the right secondary air channel to enable the air quantity of the first cold air flowing into the left secondary air channel to be the same as the air quantity of the second cold air flowing into the right secondary air channel;
step S2: according to the temperature difference of the two sides of the smoke discharging channel, the temperature of the first cold air introduced into the left secondary air channel and the temperature of the second cold air introduced into the right secondary air channel are respectively adjusted;
in the step S2, when the temperature difference between two sides of the smoke exhaust channel is greater than or equal to 5 ℃, respectively adjusting the temperature of the first cold air introduced into the left secondary air channel and the temperature of the second cold air introduced into the right secondary air channel;
in a state that the temperature of the smoke exhaust channel near one side of the first pipeline is higher than that of the smoke exhaust channel near one side of the second pipeline, reducing the temperature of first cold air introduced into the left secondary air channel and increasing the temperature of second cold air introduced into the right secondary air channel;
and in a state that the temperature of the smoke exhaust channel near one side of the first pipeline is lower than that of the smoke exhaust channel near one side of the second pipeline, increasing the temperature of the first cold air introduced into the left secondary air channel and reducing the temperature of the second cold air introduced into the right secondary air channel.
3. A method for adjusting the temperature of flue gas at the outlet of a four-compartment air preheater, characterized in that a device for adjusting the temperature of flue gas at the outlet of a four-compartment air preheater as set forth in claim 1 is used, said method comprising the steps of:
step S3: adjusting the temperature of the first cold air introduced into the left secondary air channel and the temperature of the second cold air introduced into the right secondary air channel to enable the temperature of the first cold air introduced into the left secondary air channel to be the same as the temperature of the second cold air introduced into the right secondary air channel;
step S4: according to the temperature difference of the two sides of the smoke discharging channel, respectively adjusting the air quantity change of the first cold air flowing into the left secondary air channel and the air quantity change of the second cold air flowing into the right secondary air channel;
in the step S4, when the temperature difference between two sides of the smoke exhaust channel is greater than or equal to 5 ℃, respectively adjusting the air quantity variation of the first cold air introduced into the left secondary air channel and the air quantity variation of the second cold air introduced into the right secondary air channel;
increasing the air quantity of the first cold air introduced into the left secondary air channel and reducing the air quantity of the second cold air introduced into the right secondary air channel in a state that the temperature of the smoke discharging channel close to one side of the first pipeline is higher than that of the smoke discharging channel close to one side of the second pipeline;
and in a state that the smoke temperature of the smoke discharging channel close to one side of the first pipeline is smaller than that of the smoke discharging channel close to one side of the second pipeline, reducing the air quantity of the first cold air introduced into the left secondary air channel and increasing the air quantity of the second cold air introduced into the right secondary air channel.
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| CN201810367509.8A CN108413439B (en) | 2018-04-23 | 2018-04-23 | Device and method for adjusting temperature of flue gas at outlet of air preheater with four bins |
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| CN201810367509.8A CN108413439B (en) | 2018-04-23 | 2018-04-23 | Device and method for adjusting temperature of flue gas at outlet of air preheater with four bins |
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| CN108413439A (en) | 2018-08-17 |
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