Flue structure of low-low-temperature economizer

Abstract

The invention provides a flue structure of a low-low-temperature economizer, which relates to the technical field of boiler fire coal, and comprises a mounting frame, an air preheater, a flow dividing mechanism, a flow converging mechanism, an economizer mechanism and a rectifying mechanism, and the air preheater is fixedly mounted on the left side of the top of the mounting frame; a smoke output port of the air preheater fixedly communicates with a first smoke pipeline in the left-right direction, two sets of coal economizer mechanisms in bilateral symmetry are fixedly installed on the right side of the installation frame, the tops of the coal economizer mechanisms fixedly communicate with a flow dividing mechanism, and the bottoms of the coal economizer mechanisms fixedly communicate with a flow converging mechanism. The shunting mechanism fixedly communicates with the first flue gas pipeline, the output end of the converging mechanism fixedly communicates with the rectifying mechanism, and the output end of the rectifying mechanism fixedly communicates with the dust remover; the heat efficiency is improved, energy consumption is reduced, smoke is evenly distributed through the flow dividing mechanism, the local overheating or supercooling phenomenon is avoided, stability and reliability are improved, and pollution is reduced through the rectifying mechanism and the dust remover.

Description

Technical Field

[0001] The invention relates to the technical field of boiler coal combustion, and in particular to a low-temperature economizer flue structure. Background Art

[0002] Thermal power plants consume 50% of my country's total coal production, and their exhaust heat loss is the largest of all heat losses in power plant boilers, generally 5% to 8%. The exhaust temperature of boilers in my country's current thermal power units is generally maintained at around 125 to 150°C. High exhaust temperature increases the flue gas volume, reduces the dust collection area of ​​the electrostatic precipitator, increases the dust specific resistance, and reduces the efficiency of the electrostatic precipitator; for wet desulfurization systems, high exhaust temperature will lead to increased water consumption in the desulfurization system. Therefore, it is necessary to reduce the flue gas temperature before the electrostatic precipitator, improve the dust removal efficiency, reduce the water consumption of the desulfurization system, and reduce the coal consumption of the unit.

[0003] With the continuous growth of global energy demand and the increasing awareness of environmental protection, improving energy efficiency and reducing pollutant emissions have become important issues in industrial development. In thermal power generation, steel smelting, chemical industry and other industries, boiler flue gas waste heat recovery is one of the important means of energy conservation and emission reduction. As a key equipment for flue gas waste heat recovery, the performance of low-temperature economizer directly affects the energy efficiency and environmental protection effect of the entire system.

[0004] However, there are many problems in the existing low-temperature economizer flue system, such as uneven distribution of the inlet flue gas flow field, which leads to reduced heat exchange efficiency; unreasonable flue structure design, prone to dust accumulation, corrosion and other problems, affecting the stable operation of the equipment. Therefore, the development of a new low-temperature economizer flue structure is of great significance for improving energy utilization efficiency and reducing pollutant emissions. Summary of the invention

[0005] The present invention provides a low-temperature economizer flue structure to solve the technical problems raised by the above-mentioned background technology.

[0006] In order to solve the above technical problems, the present invention provides a low-temperature economizer flue structure, including: a mounting frame, an air preheater, a diverter mechanism, a converging mechanism, an economizer mechanism and a rectifier mechanism, the air preheater is fixedly installed on the left side of the top of the mounting frame, the flue gas outlet of the air preheater is fixedly connected to the first flue gas duct in the left and right directions, two groups of left-right symmetrical economizer mechanisms are fixedly installed on the right side of the mounting frame, the top of the economizer mechanism is fixedly connected to the diverter mechanism, the bottom of the economizer mechanism is fixedly connected to the converging mechanism, the internal structures of the diverter mechanism and the converging mechanism are symmetrical up and down, the diverter mechanism is fixedly connected to the first flue gas duct, the output end of the converging mechanism is fixedly connected to the rectifier mechanism, and the output end of the rectifier mechanism is fixedly connected to the dust collector.

[0007] Preferably, the diversion mechanism includes: the right end of the first smoke duct is fixedly connected to the first smoke bend, a guide plate adjustment mechanism is provided in the first smoke bend, the guide plate adjustment mechanism includes a transmission shaft, two sets of transmission shafts are rotatably connected along the front-to-back direction in the first smoke bend, the transmission shaft is fixedly connected to an arc-shaped guide plate near the center side of the bend, the front end of the transmission shaft is fixedly connected to an adjustment plate, the adjustment plate is located on the front side of the first smoke bend, and a strip groove is provided on the top of the adjustment plate.

[0008] Preferably, a pair of sleeves are fixedly connected to the front side of the first flue gas bend along the cross-sectional direction of the bend, a sliding rod is slidably connected inside the sleeve, a pair of levers are fixedly connected to the front end of the sliding rod, the levers are slidingly hinged in the strip groove, a linear rack is fixedly provided on the top of the left end of the sliding rod, the linear rack is meshingly connected to a spur gear, the spur gear is fixedly connected to the output shaft end of a motor, the motor is fixedly connected to a bracket, and the bracket is fixedly connected to the inner curved wall of the first flue gas bend.

[0009] Preferably, the bottom of the first flue gas bend is fixedly connected to the first three-way pipe, the intersection center point of the first three-way pipe is threadedly connected to a vertical adjusting screw, the bottom end of the adjusting screw is fixedly connected to a rotating handle, the top end of the adjusting screw is rotatably connected to a vertical partition plate, the middle part of the partition plate is symmetrically hinged to an arc-shaped guide plate 2, and a tensioning spring is fixedly connected between the arc-shaped guide plates 2 at the left and right ends.

[0010] Preferably, the economizer mechanism on the left side includes: an economizer box, two branch pipes at the bottom of the first three-way pipe are fixedly connected to the economizer box, a transverse support rod is fixedly provided on the top left wall of the economizer box, a plurality of heat conduction plates are fixedly installed at intervals on the left and right sides of the bottom of the support rod, a circulating water pipe is fixedly installed on the plurality of heat conduction plates, the circulating water pipe passes through the plurality of heat conduction plates on the left and right sides, a transverse water outlet pipe is fixedly connected to the top of the circulating water pipe, a transverse water inlet pipe is fixedly connected to the bottom of the circulating water pipe, the water outlet pipe and the water inlet pipe respectively pass through the left side wall of the economizer box transversely, a water outlet pump is fixedly installed on the water outlet pipe, and a circulating water pump is fixedly installed on the water inlet pipe.

[0011] Preferably, the combining mechanism includes: a second three-way pipe, two branch pipes of the second three-way pipe are fixedly connected to the bottom of the left and right sides of the coal-saving box respectively, the second three-way pipe is symmetrical with the internal structure of the first three-way pipe, the vertical main pipe at the bottom of the second three-way pipe is fixedly connected to the second flue gas bend pipe, the second smoke gas bend pipe is symmetrical with the first smoke gas bend pipe in structure, and the output end of the second smoke gas bend pipe is fixedly connected to the second smoke duct in the left and right directions.

[0012] Preferably, the rectification mechanism includes: a rectification box, a first drawer, a second drawer, a symmetrical rectification grid 1 and an asymmetrical rectification grid 2. The left output end of the second flue gas duct is fixedly connected to the rectification box. The first drawer and the second drawer are connected by sliding up and down from right to left in sequence inside the rectification box. The symmetrical rectification grid 1 is fixedly installed in the first drawer, and the asymmetrical rectification grid 2 is fixedly installed in the second drawer.

[0013] Preferably, an accelerating fan is fixedly installed on the right outer wall of the bottom of the second smoke bend, the outlet pipe of the accelerating fan extends horizontally through the bottom of the second smoke bend, the accelerating fan is electrically connected to the controller, and a flow sensor is fixedly installed on the second smoke bend.

[0014] Preferably, it also includes: a smoke detection module for detecting the smoke flow rate and smoke kinematic viscosity in the economizer box;

[0015] Temperature sensor 1, used for detecting the temperature of flue gas entering the economizer box from the first three-way pipe, the temperature sensor 1 is installed on the inner wall at the bottom of the first three-way pipe;

[0016] Temperature sensor 2, used to detect the temperature of flue gas entering the second three-way pipe from the outlet of the economizer box, and temperature sensor 1 is installed on the inner wall of the top of the second three-way pipe;

[0017] Temperature sensor three, used to detect the inlet water temperature of the water inlet pipe;

[0018] Temperature sensor 4, used to detect the outlet water temperature of the water outlet pipe;

[0019] Calculation module 1 is used to calculate the average temperature difference of low-temperature economizer heat exchange and the Reynolds number on the flue gas side;

[0020] Calculation module 2, used for calculating the abnormal evaluation value of the heat exchange efficiency of the low-temperature economizer during each detection;

[0021] Alarm, used to give an alarm in abnormal state;

[0022] A control unit is used for centralized control and data processing, and regularly detects the low-temperature economizer at set time intervals. The flue gas detection module, the temperature sensor 1, the temperature sensor 2, the temperature sensor 3, the temperature sensor 4, the calculation module 1, and the calculation module 2 are all electrically connected to the control unit;

[0023] The comparison module is used to compare the abnormal evaluation value of the heat exchange efficiency of the low-temperature economizer with the normal evaluation threshold. When the abnormal evaluation value of the heat exchange efficiency exceeds the normal evaluation threshold, the alarm will sound, the control unit will control the low-temperature economizer to stop working, and the operator will perform maintenance.

[0024] Preferably, the calculation module 1 performs calculation based on the following formula 1:

[0025] Where: ΔT is the average heat exchange temperature difference of the low-temperature economizer during each test; T 1in is the inlet flue gas temperature of the economizer box of the low-temperature economizer detected by temperature sensor 1, T 1out is the outlet flue gas temperature of the economizer box of the low-temperature economizer detected by temperature sensor 2, T2in is the inlet water temperature of the low-temperature economizer water inlet pipe detected by temperature sensor 3, T 2out is the outlet water temperature of the outlet pipe of the low-temperature economizer detected by temperature sensor 4, ln is a logarithmic function; Re is the Reynolds number on the flue gas side of the low-temperature economizer, C y is the flue gas velocity in the economizer detected by the flue gas detection module, V y is the kinematic viscosity of the flue gas in the economizer detected by the flue gas detection module, a c is the width of the heat conducting plate, δ c is the thickness of the heat conducting plate, b c It is the left-right distance between adjacent heat conducting plates;

[0026] The calculation module 2 is calculated based on the following formula 2:

[0027] Where: K is the abnormal evaluation value of the heat exchange efficiency of the low-temperature economizer at each test, S y is the total heat exchange area of ​​the heat transfer plate on the flue gas side, h o is the heat transfer coefficient of the low-temperature economizer heat transfer plate on the water side, S o is the total heat exchange area of ​​the circulating water pipe, π is the value of pi, which is 3.14, γ g is the thermal conductivity of the circulating water pipe, l c is the length of the circulating water pipe, φ g is the outer diameter of the circulating water pipe, δ g is the thickness of the circulating water pipe, φ e is the equivalent diameter of the circulating water pipe, η c is the total surface efficiency of the circulating water pipe.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows: the low-temperature economizer flue structure provided in the embodiment of the present invention is fixedly installed with an air preheater, a diverter mechanism, a converging mechanism, an economizer mechanism and a rectifier mechanism through an installation frame. The flue gas is first preheated by the air preheater, and then enters the diverter mechanism through the first flue gas duct. In the diverter mechanism, the flue gas is evenly distributed to two groups of economizer mechanisms, and is further cooled and heat is recovered by the economizer mechanism. Afterwards, the flue gas is reunited through the converging mechanism, enters the rectifier mechanism for rectification, and finally is purified by the dust collector.

[0029] Beneficial effects:

[0030] 1. Improve thermal efficiency: Recover the heat in the flue gas through the economizer mechanism, which improves the thermal efficiency of the entire system and reduces energy consumption.

[0031] 2. Evenly distribute flue gas: The design of the diversion mechanism ensures that the flue gas can be evenly distributed to the two sets of economizer mechanisms, avoiding local overheating or overcooling and improving the stability and reliability of the system.

[0032] 3. Reduce pollution: The setting of the rectifier mechanism and dust collector effectively reduces the emission of particulate matter and pollutants in the flue gas, meeting environmental protection requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a front cross-sectional schematic diagram of the flue structure of the low-temperature economizer of the present invention;

[0035] Figure 2 yes Figure 1 A schematic diagram of the enlarged local structure at center A;

[0036] Figure 3 It is a front cross-sectional schematic diagram of the economizer mechanism of the present invention;

[0037] Figure 4 It is a front view schematic diagram of the first flue gas elbow guide plate adjustment mechanism of the present invention.

[0038] Reference numerals:

[0039] 1. Installation frame; 2. Air preheater; 3. First flue gas duct; 4. Economizer mechanism; 401. Economizer box; 402. Support rod; 403. Heat conduction plate; 404. Circulating water pipe; 405. Outlet pipe; 406. Inlet pipe; 407. Outlet pump; 408. Circulating water pump; 5. Diversion mechanism; 501. First flue gas elbow; 502. Guide plate adjustment mechanism; 5021. Transmission shaft; 5022. Arc guide plate 1; 5023. Adjustment plate; 5024. Strip groove; 503. Casing 1; 504. Sliding rod; 505. Push rod; 506. Linear rack; 5 07. Spur gear one; 508. Motor one; 509. Bracket one; 510. First three-way pipe; 511. Adjusting screw rod; 512. Turning handle; 513. Partition plate; 514. Arc guide plate two; 515. Tension spring; 6. Converging mechanism; 601. Second three-way pipe; 602. Second flue gas elbow; 603. Second flue gas duct; 7. Rectification mechanism; 701. Rectification box; 702. First drawer; 703. Second drawer; 704. Rectification grille one; 705. Rectification grille two; 8. Acceleration fan; 9. Controller; 10. Flow sensor; 11. Dust collector. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0042] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0043] The present invention provides the following embodiments

[0044] Example 1, the present invention provides a low-temperature economizer flue structure, such as Figure 1 As shown, it includes: a mounting frame 1, an air preheater 2, a diverter mechanism 5, a converging mechanism 6, an economizer mechanism 4 and a rectifying mechanism 7. The air preheater 2 is fixedly installed on the left top of the mounting frame 1, and the flue gas outlet of the air preheater 2 is fixedly connected to the first flue gas duct 3 in the left and right directions. Two groups of left-right symmetrical economizer mechanisms 4 are fixedly installed on the right side of the mounting frame 1. The top of the economizer mechanism 4 is fixedly connected to the diverter mechanism 5, and the bottom of the economizer mechanism 4 is fixedly connected to the converging mechanism 6. The internal structures of the diverter mechanism 5 and the converging mechanism 6 are symmetrical from top to bottom. The diverter mechanism 5 is fixedly connected to the first flue gas duct 3, the output end of the converging mechanism 6 is fixedly connected to the rectifying mechanism 7, and the output end of the rectifying mechanism 7 is fixedly connected to the dust collector 11.

[0045] The working principle and beneficial effects of the above technical solution are as follows: the low-temperature economizer flue structure provided by the embodiment of the present invention is fixedly installed with the air preheater 2, the diverter mechanism 5, the converging mechanism 6, the economizer mechanism 4 and the rectifying mechanism 7 through the mounting frame 1. The flue gas is first preheated by the air preheater 2, and then enters the diverter mechanism 5 through the first flue gas duct 3. In the diverter mechanism 5, the flue gas is evenly distributed to the two groups of economizer mechanisms 4, and is further cooled and heat is recovered by the economizer mechanism 4. Afterwards, the flue gas is reunited through the converging mechanism 6, enters the rectifying mechanism 7 for rectification, and finally is purified by the dust collector 11.

[0046] Beneficial effects:

[0047] 1. Improve thermal efficiency: The heat in the flue gas is recovered through the economizer mechanism 4, which improves the thermal efficiency of the entire system and reduces energy consumption.

[0048] 2. Evenly distribute the flue gas: The design of the diversion mechanism 5 ensures that the flue gas can be evenly distributed to the two sets of economizer mechanisms 4, avoiding local overheating or overcooling, and improving the stability and reliability of the system.

[0049] 3. Reduce pollution: The arrangement of the rectifier mechanism 7 and the dust collector 11 effectively reduces the emission of particulate matter and pollutants in the flue gas, meeting environmental protection requirements.

[0050] Embodiment 2, on the basis of embodiment 1, as Figure 1-Figure 4 As shown, the diversion mechanism 5 includes: the right end of the first flue gas duct 3 is fixedly connected to the first flue gas bend 501, a guide plate adjustment mechanism 502 is provided in the first flue gas bend 501, the guide plate adjustment mechanism 502 includes a transmission shaft 5021, two sets of transmission shafts 5021 are rotatably connected along the front-to-back direction in the first flue gas bend 501, the transmission shaft 5021 is fixedly connected to an arc-shaped guide plate 5022 near the center side of the bend, the front end of the transmission shaft 5021 is fixedly connected to an adjustment plate 5023, the adjustment plate 5023 is located on the front side of the first flue gas bend 501, and a strip groove 5024 is provided on the top of the adjustment plate 5023.

[0051] A pair of sleeves 503 are fixedly connected to the front side of the first flue gas bend 501 along the cross-sectional direction of the bend, a sliding rod 504 is slidably connected inside the sleeve 503, a pair of levers 505 are fixedly connected to the front end of the sliding rod 504, the levers 505 are slidably hinged in the strip groove 5024, a linear rack 506 is fixedly provided on the top of the left end of the sliding rod 504, the linear rack 506 is meshedly connected to a spur gear 507, the spur gear 507 is fixedly connected to the output shaft end of a motor 508, the motor 508 is fixedly connected to a bracket 509, and the bracket 509 is fixedly connected to the inner curved wall of the first flue gas bend 501.

[0052] The bottom of the first flue gas bend 501 is fixedly connected to the first three-way pipe 510, and the first three-way pipe 510 is threadedly connected to a vertical adjusting screw 511 at the intersection center point. The bottom end of the adjusting screw 511 is fixedly connected to a rotating handle 512, and the top end of the adjusting screw 511 is rotatably connected to a vertical partition plate 513. The middle part of the partition plate 513 is symmetrically hinged to an arc guide plate 2 514, and a tensioning spring 515 is fixedly connected between the arc guide plates 514 at the left and right ends.

[0053] The working principle and beneficial effects of the above technical solution are as follows: on the basis of Example 1, the diversion mechanism 5 is increased with a guide plate adjustment mechanism 502. When the guide plate adjustment mechanism 502 is working, the motor 508 runs to drive the spur gear 507 to rotate in the forward direction. The spur gear 507 rotates and engages the transmission to make the linear rack 506 slide along the direction of the sleeve 503 with the sliding rod 504. The lever 505 on the sliding rod 504 drives the strip groove 5024 and the adjustment plate 5023 to rotate clockwise. The adjustment plate 5023 drives the transmission shaft 5021 and the arc-shaped guide plate 5022 to rotate clockwise synchronously to adjust the angle of the arc-shaped guide plate 5022, and vice versa. The arc-shaped guide plate 5022 and the adjustment plate 5023 are finally driven to move by the motor drive to adjust the flue gas flow direction. At the same time, a first three-way pipe 510 and an adjusting screw rod 511 are also provided at the bottom of the first flue gas elbow 501. The positions of the partition plate 513 and the second arc guide plate 514 are adjusted by rotating the handle 512 to further adjust the distribution and flow direction of the flue gas.

[0054] Beneficial effects:

[0055] 1. Flexible adjustment: The design of the guide plate adjustment mechanism 502 and the adjustment screw 511 allows the distribution and flow direction of the smoke to be flexibly adjusted according to actual needs, thereby improving the adaptability and flexibility of the system.

[0056] 2. Optimizing the flow field: By adjusting the positions of the guide plate and the partition plate 513, the flue gas flow field can be optimized, eddy currents and resistance can be reduced, and the overall performance of the system can be improved.

[0057] 3. Enhanced stability: The setting of the tension spring 515 ensures the stability of the arc-shaped guide plate 2 514, and prevents damage or failure caused by vibration or airflow impact.

[0058] Embodiment 3, on the basis of embodiment 1, as Figure 1 , Figure 3As shown, preferably, the economizer mechanism 4 on the left side includes: an economizer box 401, two branch pipes at the bottom of the first three-way pipe 510 are fixedly connected to the economizer box 401, a transverse support rod 402 is fixedly provided on the top left wall of the economizer box 401, a plurality of heat conducting plates 403 are fixedly installed at intervals on the left and right sides of the bottom of the support rod 402, a circulating water pipe is fixedly installed on the plurality of heat conducting plates 403, the circulating water pipe passes through the plurality of heat conducting plates 403 on the left and right sides, a transverse water outlet pipe 405 is fixedly connected to the top of the circulating water pipe, a transverse water inlet pipe 406 is fixedly connected to the bottom of the circulating water pipe, the water outlet pipe 405 and the water inlet pipe 406 respectively pass through the left side wall of the economizer box 401 transversely, a water outlet pump 407 is fixedly installed on the water outlet pipe 405, and a circulating water pump 408 is fixedly installed on the water inlet pipe 406.

[0059] The combining mechanism 6 includes: a second three-way pipe 601, two branch pipes of the second three-way pipe 601 are fixedly connected to the bottom of the coal-saving box 401 on the left and right sides respectively, the second three-way pipe 601 and the first three-way pipe 510 have an internal structure symmetrical up and down, the vertical main pipe at the bottom of the second three-way pipe 601 is fixedly connected to the second flue gas bend 602, the second flue gas bend 602 and the first flue gas bend 501 have a structure symmetrical up and down, and the output end of the second flue gas bend 602 is fixedly connected to the second flue gas duct 603 in the left and right directions.

[0060] The working principle and beneficial effects of the above technical solution are as follows: Based on Example 1, the specific structures of the economizer mechanism 4 and the converging mechanism 6 are described in detail. The economizer mechanism 4 realizes heat recovery and transfer through components such as the economizer box 401, the heat conduction plate 403, and the circulating water pipe 404. The converging mechanism 6 re-converges the flue gas discharged from the economizer mechanisms 4 on both sides through the second three-way pipe 601, and outputs it through the second flue gas elbow 602.

[0061] Beneficial effects:

[0062] 1. High-efficiency heat exchange: The economizer mechanism 4 adopts the design of heat conduction plate 403 and circulating water pipe 404, which realizes high-efficiency heat recovery and transfer, and improves the thermal efficiency of the system.

[0063] 2. Compact structure: The economizer mechanism 4 and the converging mechanism 6 are compactly and reasonably designed, which reduces the floor space and space requirements.

[0064] 3. Stable output: The confluence mechanism 6 ensures that the flue gas discharged from the economizer mechanisms 4 on both sides can be stably and evenly merged, providing favorable conditions for subsequent rectification and dust removal. This structure improves the uniformity of the flue gas flow field at the inlet of the low-temperature economizer by optimizing the flue layout and the design of the guide device, enhances the heat exchange effect, reduces the occurrence of ash accumulation, corrosion and other problems, and improves the overall operation stability and service life of the equipment.

[0065] Embodiment 4, on the basis of embodiment 1, as Figure 1 As shown, the rectifying mechanism 7 includes: a rectifying box 701, a first drawer 702, a second drawer 703, a symmetrical rectifying grid 1 704 and an asymmetrical rectifying grid 2 705. The left output end of the second flue gas duct 603 is fixedly connected to the rectifying box 701. The rectifying box 701 slides up and down from right to left in sequence to connect the first drawer 702 and the second drawer 703. The symmetrical rectifying grid 1 704 is fixedly installed in the first drawer 702, and the asymmetrical rectifying grid 2 705 is fixedly installed in the second drawer 703.

[0066] An accelerating fan 8 is fixedly installed on the right outer wall at the bottom of the second flue gas bend 602 . An air outlet pipe of the accelerating fan 8 extends transversely through the bottom of the second flue gas bend 602 . The accelerating fan 8 is electrically connected to the controller 9 . A flow sensor 10 is fixedly installed on the second flue gas bend 602 .

[0067] The working principle and beneficial effects of the above technical solution are as follows: Working principle: Based on Example 1, the rectifier mechanism 7 adopts a drawer-type design, and the first drawer 702 and the second drawer 703 connected by sliding are respectively installed with a symmetrical rectifier grid 1 704 and an asymmetrical rectifier grid 2 705. At the same time, an accelerating fan 8 and a flow sensor 10 are installed at the bottom of the second flue gas elbow 602, and the intelligent control of the fan is realized through the controller 9.

[0068] Beneficial effects:

[0069] 1. Flexible rectification: The drawer-type design and rectification grids of different shapes enable the rectification mechanism 7 to be flexibly adjusted and the rectification effect to be optimized according to the actual situation of the flue gas.

[0070] 2. Improving purification efficiency: The provision of the accelerating fan 8 increases the flow velocity and turbulence of the flue gas in the rectifying box 701 , which helps to improve the purification efficiency of the dust collector 11 .

[0071] 3. Intelligent control: The combination of the flow sensor 10 and the controller 9 realizes the intelligent control of the acceleration fan 8, and can automatically adjust the speed and power of the fan according to the flow rate and flow velocity of the flue gas to achieve the purpose of energy saving and consumption reduction.

[0072] Embodiment 5, based on Embodiment 1, is further provided with: a flue gas detection module for detecting the flue gas flow rate and flue gas kinematic viscosity in the economizer box 401;

[0073] Temperature sensor 1, used to detect the temperature of flue gas entering the economizer box 401 through the first three-way pipe 510, the temperature sensor 1 is installed on the bottom inner wall of the first three-way pipe 510;

[0074] Temperature sensor 2, used to detect the temperature of flue gas entering the second three-way pipe 601 from the outlet of the economizer box 401, and the temperature sensor 1 is installed on the inner wall of the top of the second three-way pipe 601;

[0075] Temperature sensor three, used to detect the inlet water temperature of the water inlet pipe 406;

[0076] Temperature sensor 4, used to detect the outlet water temperature of the water outlet pipe 405;

[0077] Calculation module 1 is used to calculate the average temperature difference of low-temperature economizer heat exchange and the Reynolds number on the flue gas side;

[0078] Calculation module 2, used for calculating the abnormal evaluation value of the heat exchange efficiency of the low-temperature economizer during each detection;

[0079] Alarm, used to give an alarm in abnormal state;

[0080] A control unit is used for centralized control and data processing, and regularly detects the low-temperature economizer at set time intervals. The flue gas detection module, the temperature sensor 1, the temperature sensor 2, the temperature sensor 3, the temperature sensor 4, the calculation module 1, and the calculation module 2 are all electrically connected to the control unit;

[0081] The comparison module is used to compare the abnormal evaluation value of the heat exchange efficiency of the low-temperature economizer with the normal evaluation threshold. When the abnormal evaluation value of the heat exchange efficiency exceeds the normal evaluation threshold, the alarm will sound, the control unit will control the low-temperature economizer to stop working, and the operator will perform maintenance.

[0082] The calculation module 1 performs calculation based on the following formula 1;

[0083] Where: ΔT is the average heat exchange temperature difference of the low-temperature economizer during each test; T 1in is the inlet flue gas temperature of the economizer box 401 of the low-temperature economizer detected by temperature sensor 1, T 1out is the outlet flue gas temperature of the economizer box 401 of the low-temperature economizer detected by the temperature sensor 2, T 2in is the inlet water temperature of the low-temperature economizer water inlet pipe 406 detected by temperature sensor 3, T 2out is the outlet water temperature of the outlet pipe 405 of the low-temperature economizer detected by the temperature sensor 4, ln is a logarithmic function; Re is the flue gas side Reynolds number of the low-temperature economizer, C y is the flue gas flow rate in the economizer box 401 detected by the flue gas detection module, V y is the kinematic viscosity of the flue gas in the economizer box 401 detected by the flue gas detection module, a c is the width of the heat conducting plate 403, δ c is the thickness of the heat conducting plate 403, b cis the left-right spacing between adjacent heat conducting plates 403;

[0084] The calculation module 2 is calculated based on the following formula 2:

[0085] Where: K is the abnormal evaluation value of the heat exchange efficiency of the low-temperature economizer at each test, S y is the total heat exchange area of ​​the heat transfer plate 403 on the flue gas side, h o is the heat transfer coefficient of the low-temperature economizer heat transfer plate 403 on the water side, S o is the total heat exchange area of ​​the circulating water pipe 404, π is the value of pi, which is 3.14, and γ g is the thermal conductivity of the circulating water pipe 404, l c is the length of the circulating water pipe 404, φ g is the outer diameter of the circulating water pipe 404, δ g is the thickness of the circulating water pipe 404, φ e is the equivalent diameter of the circulating water pipe 404, η c is the total surface efficiency of the circulating water pipe 404.

[0086] The working principle and beneficial effects of the above technical solution are as follows: the control unit performs multiple detections on the low-temperature economizer at set time intervals, and the flue gas detection module detects the flue gas flow rate and flue gas kinematic viscosity in the economizer box 401; the temperature sensor starts to detect the flue gas temperature entering the economizer box 401 from the first three-way pipe 510; the temperature sensor 2 starts to detect the flue gas temperature entering the second three-way pipe 601 at the outlet of the economizer box 401; the temperature sensor 3 detects the inlet water temperature of the water inlet pipe 406; the temperature sensor 4 starts to detect the outlet water temperature of the water outlet pipe 405; at the same time, the flue gas detection module, the temperature sensor 1, the temperature sensor 2, the temperature sensor 3, and the temperature sensor 4 respectively detect the flue gas temperature entering the second three-way pipe 601 at the outlet of the economizer box 401. The data is transmitted to the control unit; the control unit controls calculation module 1 and calculation module 2 to perform calculations; calculation module 1 calculates the average temperature difference of the low and low temperature economizer heat exchange and the Reynolds number on the flue gas side; calculation module 2 calculates the abnormal evaluation value of the low and low temperature economizer heat exchange efficiency at each detection based on calculation module 1; the comparison module compares the abnormal evaluation value of the low and low temperature economizer heat exchange efficiency with the normal evaluation threshold. When the abnormal evaluation value of the heat exchange efficiency exceeds the normal evaluation threshold, the alarm sounds, the control unit controls the low and low temperature economizer to stop working, and the operator performs maintenance, which is conducive to timely detection of abnormal conditions of the low and low temperature economizer, timely maintenance effectively avoids safety accidents, and improves the service life of the equipment.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low-temperature economizer flue structure, characterized in that: include: An installation frame (1), an air preheater (2), a flow splitter (5), a flow converging mechanism (6), an economizer mechanism (4) and a rectifier mechanism (7); the air preheater (2) is fixedly installed on the left side of the top of the installation frame (1); the flue gas outlet of the air preheater (2) is fixedly connected to a first flue gas duct (3) in the left and right directions; two groups of economizer mechanisms (4) are fixedly installed on the right side of the installation frame (1); the top of the economizer mechanism (4) is fixedly connected to the flow splitter (5); the bottom of the economizer mechanism (4) is fixedly connected to the flow converging mechanism (6); the internal structures of the flow splitter (5) and the flow converging mechanism (6) are symmetrical in the upper and lower directions; the flow splitter (5) is fixedly connected to the first flue gas duct (3); the output end of the flow converging mechanism (6) is fixedly connected to the rectifier mechanism (7); and the output end of the rectifier mechanism (7) is fixedly connected to a dust collector (11).

2. A low-temperature economizer flue structure according to claim 1, characterized in that: The flow dividing mechanism (5) comprises: the right end of the first smoke duct (3) is fixedly connected to the first smoke bend (501); a guide plate adjustment mechanism (502) is arranged inside the first smoke bend (501); the guide plate adjustment mechanism (502) comprises a transmission shaft (5021); two sets of transmission shafts (5021) are rotatably connected in the first smoke bend (501) along the front-to-back direction; the transmission shaft (5021) is fixedly connected to an arc-shaped guide plate 1 (5022) near the center of the bend; the front end of the transmission shaft (5021) is fixedly connected to an adjustment plate (5023); the adjustment plate (5023) is located at the front side of the first smoke bend (501); and a strip groove (5024) is arranged on the top of the adjustment plate (5023).

3. A low-temperature economizer flue structure according to claim 2, characterized in that: include: The front side of the first flue gas bend (501) is fixedly connected to a pair of sleeves (503) along the cross-sectional direction of the bend; a sliding rod (504) is slidably connected inside the sleeve (503); a pair of shifting rods (505) are fixedly connected to the front end of the sliding rod (504); the shifting rod (505) is slidably hinged in the strip groove (5024); a linear rack (506) is fixedly provided on the top of the left end of the sliding rod (504); the linear rack (506) is meshedly connected to a spur gear (507); the spur gear (507) is fixedly connected to the output shaft end of a motor (508); the motor (508) is fixedly connected to a bracket (509); and the bracket (509) is fixedly connected to the inner curved wall of the first flue gas bend (501).

4. A low-temperature economizer flue structure according to claim 3, characterized in that: include: The bottom of the first flue gas bend (501) is fixedly connected to the first three-way pipe (510), and the first three-way pipe (510) is threadedly connected to a vertical adjustment screw rod (511) at the intersection center point. The bottom end of the adjustment screw rod (511) is fixedly connected to a rotating handle (512), and the top end of the adjustment screw rod (511) is rotatably connected to a vertical partition plate (513). The middle part of the partition plate (513) is symmetrically hinged to the second arc guide plate (514), and a tension spring (515) is fixedly connected between the second arc guide plates (514) at the left and right ends.

5. A low-temperature economizer flue structure according to claim 4, characterized in that: The economizer mechanism (4) on the left side comprises: an economizer box (401), two branch pipes at the bottom of the first three-way pipe (510) are fixedly connected to the economizer box (401), a horizontal support rod (402) is fixedly provided on the left side wall of the top of the economizer box (401), a plurality of heat conduction plates (403) are fixedly installed at intervals on the left and right sides of the bottom of the support rod (402), and a circulating water pipe (404) is fixedly installed on the plurality of heat conduction plates (403), and the circulating water pipe (404) is fixedly installed on the left and right sides of the circulating water pipe (404). The circulating water pipe (404) penetrates through a plurality of heat conducting plates (403), the top of the circulating water pipe (404) is fixedly connected to a transverse water outlet pipe (405), and the bottom of the circulating water pipe (404) is fixedly connected to a transverse water inlet pipe (406). The water outlet pipe (405) and the water inlet pipe (406) respectively penetrate through the left side wall of the economizer box (401) transversely. A water outlet pump (407) is fixedly installed on the water outlet pipe (405), and a circulating water pump (408) is fixedly installed on the water inlet pipe (406).

6. A low-temperature economizer flue structure according to claim 5, characterized in that: The confluence mechanism (6) comprises: a second three-way pipe (601); the bottoms of the economizer boxes (401) on the left and right sides are respectively fixedly connected to two branch pipes of the second three-way pipe (601); the internal structures of the second three-way pipe (601) and the first three-way pipe (510) are symmetrical in vertical direction; the vertical main pipe at the bottom of the second three-way pipe (601) is fixedly connected to a second flue gas bend pipe (602); the second flue gas bend pipe (602) and the first flue gas bend pipe (501) are symmetrical in vertical direction; and the output end of the second flue gas bend pipe (602) is fixedly connected to a second flue gas duct (603) in the left and right directions.

7. A low-temperature economizer flue structure according to claim 6, characterized in that: The rectifying mechanism (7) comprises: a rectifying box (701), a first drawer (702), a second drawer (703), a symmetrical rectifying grid one (704) and an asymmetrical rectifying grid two (705); the left output end of the second smoke duct (603) is fixedly connected to the rectifying box (701); the rectifying box (701) is connected to the first drawer (702) and the second drawer (703) by sliding up and down from right to left in sequence; the symmetrical rectifying grid one (704) is fixedly installed in the first drawer (702), and the asymmetrical rectifying grid two (705) is fixedly installed in the second drawer (703).

8. A low-temperature economizer flue structure according to claim 6, characterized in that: include: An accelerating fan (8) is fixedly installed on the right outer wall at the bottom of the second smoke bend (602); an air outlet pipe of the accelerating fan (8) extends transversely through the bottom of the second smoke bend (602); the accelerating fan (8) is electrically connected to the controller (9); and a flow sensor (10) is fixedly installed on the second smoke bend (602).

9. A low-temperature economizer flue structure according to claim 6, characterized in that: Also includes: A flue gas detection module, used for detecting the flue gas flow rate and flue gas kinematic viscosity in the economizer box (401); Temperature sensor 1, used for detecting the temperature of flue gas entering the economizer box (401) through the first three-way pipe (510), the temperature sensor 1 being installed on the inner wall at the bottom of the first three-way pipe (510); Temperature sensor 2, used for detecting the temperature of flue gas entering the second three-way pipe (601) from the outlet of the economizer box (401), the temperature sensor 1 being installed on the inner wall of the top of the second three-way pipe (601); Temperature sensor three, used to detect the inlet water temperature of the water inlet pipe (406); Temperature sensor 4, used to detect the outlet water temperature of the water outlet pipe (405); Calculation module 1 is used to calculate the average temperature difference of low-temperature economizer heat exchange and the Reynolds number on the flue gas side; Calculation module 2, used for calculating the abnormal evaluation value of the heat exchange efficiency of the low-temperature economizer during each detection; Alarm, used to give an alarm in abnormal state; A control unit is used for centralized control and data processing, and regularly detects the low-temperature economizer at set time intervals. The flue gas detection module, the temperature sensor 1, the temperature sensor 2, the temperature sensor 3, the temperature sensor 4, the calculation module 1, and the calculation module 2 are all electrically connected to the control unit; The comparison module is used to compare the abnormal evaluation value of the heat exchange efficiency of the low-temperature economizer with the normal evaluation threshold. When the abnormal evaluation value of the heat exchange efficiency exceeds the normal evaluation threshold, the alarm will sound, the control unit will control the low-temperature economizer to stop working, and the operator will perform maintenance.

10. A low-temperature economizer flue structure according to claim 9, characterized in that: include: The calculation module 1 performs calculation based on the following formula 1; Where: ΔT is the average heat exchange temperature difference of the low-temperature economizer during each test; T 1in is the inlet flue gas temperature of the economizer box (401) of the low-temperature economizer detected by the temperature sensor 1, T 1out is the outlet flue gas temperature of the economizer box (401) of the low-temperature economizer detected by the temperature sensor 2, T 2in is the inlet water temperature of the water inlet pipe (406) of the low-temperature economizer detected by the temperature sensor 3, T 2out is the outlet water temperature of the outlet pipe (405) of the low-temperature economizer detected by the temperature sensor 4, ln is a logarithmic function; Re is the flue gas side Reynolds number of the low-temperature economizer, C y is the flue gas flow rate in the economizer box (401) detected by the flue gas detection module, V y is the kinematic viscosity of the flue gas in the economizer box (401) detected by the flue gas detection module, a c is the width of the heat conducting plate (403), δ c is the thickness of the heat conducting plate (403), b c is the left-right spacing between adjacent heat conducting plates (403); The calculation module 2 is calculated based on the following formula 2: Where: K is the abnormal evaluation value of the heat exchange efficiency of the low-temperature economizer at each test, S y is the total heat exchange area of ​​the flue gas side heat transfer plate (403), h o is the heat transfer coefficient of the low-temperature economizer heat transfer plate (403) on the water side, S o is the total heat exchange area of ​​the circulating water pipe (404), π is the value of pi, which is 3.14, and γ g is the thermal conductivity of the circulating water pipe (404), l c is the length of the circulating water pipe (404), φ g is the outer diameter of the circulating water pipe (404), δ g is the thickness of the circulating water pipe (404), φ e is the equivalent diameter of the circulating water pipe (404), η c is the total surface efficiency of the circulating water pipe (404).

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