Anti-corrosion low-low-temperature economizer

Abstract

The invention relates to the technical field of coal economizers, and discloses an anti-corrosion low-low-temperature coal economizer which comprises a coal economizer body, an air inlet is fixedly formed in the top end of the coal economizer body, an air outlet is formed in the bottom end of the coal economizer body, and a heat exchange tube bundle is installed in the coal economizer body. A flue gas collecting pipe is fixedly mounted in the coal device main body, a NaOH powder injection pipe is mounted in the coal device main body, the right side of the flue gas collecting pipe is communicated with a filter, a filtering assembly is arranged in the filter, the right side of the filter is communicated with a protection box, and a flue gas analyzer is fixedly mounted in the protection box. And an adjusting assembly is arranged in the protection box. According to the technical scheme of the NaOH powder discharging box, the motor is used for stirring to prevent caking, the electric discharging valve is used for accurate control, and the electronic balance is used for weighing and feeding back in real time, so that the accuracy and stability of the discharging amount of NaOH powder are ensured, and the situation that the anti-corrosion effect is affected due to too much or too little discharging is effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of economizers, in particular to a corrosion-resistant low-temperature economizer. Background Art

[0002] In recent years, the total energy consumption in China is 5.41 billion tons of standard coal, accounting for 56.2% of the total energy consumption. This is 0.3 percentage points higher than the previous year. Coal is the main source of energy in my country. Boilers are equipment that burns coal. Low-temperature economizers are heat exchangers at the tail of power plant boilers. They are mainly composed of pipes. Hot water is passed through the pipes. The waste heat of flue gas heats the hot water into a heating surface of saturated water under drum pressure, which effectively utilizes the heat energy generated by coal combustion and improves energy efficiency.

[0003] Coal contains a large amount of sulfur. The SO2 and SO3 produced by combustion will enter the tail of the boiler with the flue gas. When it is lower than the acid dew point, the SO3 in the flue gas will easily condense into a sulfuric acid solution, causing corrosion to the tube bundle. Researchers suggest that the outlet temperature should be above 135°C to reduce the amount of SO3 condensation. The design outlet temperature of the low-temperature economizer is 90°C, and it is often lower than this temperature during actual operation. Low-temperature corrosion often occurs. The high moisture content in the flue gas will also cause the acid dew point to rise, making the economizer tube bundle more susceptible to corrosion.

[0004] The temperature at the front side of the low-temperature economizer is higher, and it is less likely to be below the acid dew point. The front side is not easily damaged by the acid solution, while the temperature at the back half is lower, and the acid solution can easily damage the tube wall. In addition, the flue gas flow rate is slower here, and dust is easily accumulated. The filtration system is simple, and mostly uses a single layer or a simple filter combination, which makes it difficult to effectively remove various impurities in the flue gas, including large particles of dust, tiny particles, and harmful gas components. Furthermore, in the implementation of anti-corrosion measures, the traditional economizer has extremely rough control over the feeding of anti-corrosion agents such as NaOH powder, lacks effective anti-caking measures and precise feeding amount control means, resulting in the NaOH powder feeding amount being difficult to match with actual needs. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a corrosion-resistant low-temperature economizer, which solves the problems that the temperature in the second half of the low-temperature economizer is low, the acidic solution is easy to damage the tube wall, the flue gas flow speed is slow here, and dust is easy to accumulate, and its filtration system is difficult to effectively remove various impurities in the flue gas. In the implementation of anti-corrosion measures, anti-corrosion agents such as NaOH powder lack effective anti-caking measures and precise feeding amount control means, resulting in the problem that the feeding amount of NaOH powder is difficult to match the actual demand.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: an anti-corrosion low-temperature economizer, comprising a coal burner body, an air inlet is fixedly opened at the top of the coal burner body, an air outlet is opened at the bottom of the coal burner body, a heat exchange tube bundle is installed inside the coal burner body, a flue gas collection pipe is fixedly installed inside the coal burner body, a NaOH powder injection pipe is installed inside the coal burner body, a filter is connected to the right side of the flue gas collection pipe, a filter assembly is arranged inside the filter, a protection box is connected to the right side of the filter, and a filter assembly is fixedly installed inside the protection box. A flue gas analyzer is installed, an adjustment component is arranged inside the protection box, a control terminal is installed on the right side of the protection box, an air compressor is connected to the front side of the protection box, an air intake pipe is connected to the left end of the air compressor, an electromagnetic reversing valve is installed on the air intake pipe, a NaOH powder feed box is fixedly installed at one end of the air intake pipe away from the air compressor, an anti-blocking component is arranged inside the NaOH powder feed box, an outlet pipe is fixedly connected to the left end of the NaOH powder feed box, the outlet pipe is connected to the coal burner body, and a high-pressure gas nozzle is installed inside the coal burner body; The filter assembly includes a box body, a purification assembly is arranged inside the box body, a motor 1 is installed on the box body, a rotating rod is fixedly connected to the output end of the motor 1, a dust cleaning assembly is arranged outside the rotating rod, and a drawer is slidably connected to the inside of the box body.

[0007] Preferably, the purification component includes a coarse filter, a fine filter is installed inside the box, and a fine filter is installed inside the box. The coarse filter, fine filter and fine filter are installed inside the box in order from left to right.

[0008] Preferably, the dust cleaning assembly includes a cleaning plate, the cleaning plate is installed on the outside of the rotating rod, bristles are installed on the cleaning plate, two groups of cleaning plates are provided, and the cleaning plates are rotatably connected to the inside of the box.

[0009] Preferably, the adjustment component includes a vent, which is installed on a protective box, a dust net is installed on the protective box, a fan is installed on the inner top of the protective box, a sliding component is provided inside the vent, an electric push rod is installed on the protective box, a baffle is fixedly connected to the telescopic end of the electric push rod, a humidity sensor is installed on the inner wall of the protective box, heating boxes are provided on both sides of the interior of the protective box, heating wires are installed on the inner wall of the heating boxes, and a temperature sensor is installed on the inner wall of the protective box.

[0010] Preferably, the anti-blocking component includes a partition, which is installed inside the NaOH powder discharge box, a stirring component is provided on the upper side of the partition, an electric discharge valve is installed on the partition, an electronic balance is installed on the inner bottom of the NaOH powder discharge box, and a supply component is provided on the NaOH powder discharge box.

[0011] Preferably, the stirring assembly includes a second motor, and the second motor is installed on the NaOH powder feed box, and the output end of the second motor is fixedly connected to a stirring rod.

[0012] Preferably, the supply assembly comprises a storage tank, the storage tank is fixedly mounted on the NaOH powder discharge box, and a solenoid valve is fixedly mounted on the lower side of the storage tank.

[0013] Preferably, the flue gas collection pipe comprises a meandering pipe on which a flue gas collection port is mounted, and the NaOH powder injection pipe comprises a meandering pipe fitting on which a NaOH powder injection port is mounted.

[0014] Preferably, the air compressor, flue gas analyzer, NaOH powder discharge box, electromagnetic reversing valve, solenoid valve, temperature sensor and humidity sensor are all electrically connected to the control terminal.

[0015] Preferably, two groups of heat exchange tube bundles are provided, and the two groups of heat exchange tube bundles are respectively close to the air inlet and the air outlet of the economizer body.

[0016] The present invention provides a corrosion-resistant low-temperature economizer. It has the following beneficial effects: 1. The present invention adopts a flue gas collection tube with a circular tube structure, a multi-layer filter assembly including coarse, fine and precise filters, and a filter technical solution with an automatic dust cleaning structure to collect representative flue gas samples in all directions and deeply purify them. At the same time, the adjustment assembly in the protective box creates a stable environment for the flue gas analyzer. It achieves the technical effect of providing pure and accurate samples for the flue gas analyzer and ensuring its high-precision analysis of flue gas components and contents. Compared with the existing technology with limited collection position, incomplete filtration, and analyzer susceptible to environmental interference, it solves the problem of large deviation in analysis data and inability to provide a reliable basis for anti-corrosion control, so that the present invention can accurately grasp the flue gas conditions and lay a solid foundation for subsequent anti-corrosion operations.

[0017] 2. The present invention adopts a technical solution of a NaOH powder feeding box with motor stirring to prevent caking, electric feeding valve for precise control, and electronic balance for real-time weighing feedback, which ensures the accuracy and stability of the amount of NaOH powder fed. It achieves the technical effect of accurately feeding NaOH powder according to actual needs and effectively avoiding the impact of excessive or insufficient feeding on the anti-corrosion effect. Compared with the prior art method of rough feeding amount control that is easily affected by the powder state, it solves the problem of unstable anti-corrosion effect, which may lead to waste of resources or aggravated equipment corrosion, ensures the anti-corrosion effect of the economizer, extends the service life of the equipment and reduces maintenance costs.

[0018] 3. The present invention adopts a NaOH powder spraying pipe with a round pipe fitting to uniformly spray powder to promote neutralization reaction, and a solenoid reversing valve to control the regular cleaning of the high-pressure gas nozzle. The technical effect of making NaOH powder fully react with sulfuric acid to remove the corrosion source, and at the same time, forcibly removing the neutralization reaction product and ash accumulation. Compared with the economizer in the prior art with insufficient reaction and difficult ash cleaning, the problem of the equipment being susceptible to corrosion and the heat exchange efficiency being reduced due to ash accumulation is solved, the economizer is maintained in good working condition, the energy utilization efficiency is improved, the equipment failure and downtime are reduced, and the stable and efficient operation of the system is guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic diagram of the internal structure of the main body of the coal burner of the present invention; Figure 3 It is a schematic diagram of the structure of the filter assembly of the present invention; Figure 4 It is a schematic diagram of the interior of the protection box of the present invention; Figure 5 It is a schematic diagram of a heating box of the present invention; Figure 6 It is a schematic diagram of the structure of the regulating component of the present invention; Figure 7 This is a schematic diagram of the NaOH powder feeding box structure of the present invention; Figure 8 It is a schematic diagram of the storage tank structure of the present invention.

[0020] Among them, 1. coal burner body; 2. heat exchange tube bundle; 3. flue gas collection tube; 31. flue gas collection port; 32. round tube; 4. NaOH powder injection tube; 41. round tube fitting; 42. NaOH powder injection port; 5. filter; 6. filter assembly; 61. coarse filter; 62. fine filter; 63. fine filter; 64. motor 1; 65. rotating rod; 66. cleaning plate; 67. brush; 68. box; 69. drawer; 7. protective box; 8. flue gas analyzer; 9. adjustment assembly; 91. temperature sensor; 92. humidity sensor; 93 , heating wire; 94, fan; 95, vent; 96, dust screen; 97, electric push rod; 98, baffle; 99, heating box; 10, control terminal; 11, air compressor; 12, solenoid reversing valve; 13, air inlet pipe; 14, air outlet pipe; 15, anti-blocking component; 151, motor 2; 152, stirring rod; 153, electronic balance; 154, storage tank; 155, solenoid valve; 156, partition; 157, electric discharge valve; 16, high-pressure gas nozzle; 17, NaOH powder discharge box; 18, air outlet; 19, air inlet. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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.

[0022] Please refer to the attached Figure 1 -Attached Figure 3The embodiment of the present invention provides a corrosion-resistant low-temperature economizer, including a coal burner body 1, an air inlet 19 is fixedly opened at the top of the coal burner body 1, an air outlet 18 is opened at the bottom of the coal burner body 1, a heat exchange tube bundle 2 is installed inside the coal burner body 1, two groups of heat exchange tube bundles 2 are provided, and the two groups of heat exchange tube bundles 2 are respectively close to the air inlet 19 and the air outlet 18 of the coal burner body 1, a flue gas collection pipe 3 is fixedly installed inside the coal burner body 1, a NaOH powder injection pipe 4 is installed inside the coal burner body 1, the flue gas collection pipe 3 includes a round pipe 32, a flue gas collection port 31 is installed on the round pipe 32, the NaOH powder injection pipe 4 includes a round pipe fitting 41, a NaOH powder injection port 42 is installed on the round pipe fitting 41, and the right side of the flue gas collection pipe 3 is connected to a filter 5, a filter assembly 6 is arranged inside the filter 5, a protection box 7 is connected to the right side of the filter 5, a flue gas analyzer 8 is fixedly installed inside the protection box 7, a regulating assembly 9 is arranged inside the protection box 7, a control terminal 10 is installed on the right side of the protection box 7, an air compressor 11 is connected to the front side of the protection box 7, an air intake pipe 13 is connected to the left end of the air compressor 11, an electromagnetic reversing valve 12 is installed on the air intake pipe 13, a NaOH powder discharge box 17 is fixedly installed at one end of the air intake pipe 13 away from the air compressor 11, an anti-blocking assembly 15 is arranged inside the NaOH powder discharge box 17, an outlet pipe 14 is fixedly connected to the left end of the NaOH powder discharge box 17, the outlet pipe 14 is connected to the coal burner body 1, and a high-pressure gas nozzle 16 is installed inside the coal burner body 1; High-temperature flue gas enters from the air inlet 19 at the top of the main body 1 of the coal burner. The two groups of heat exchange tube bundles 2 are cleverly arranged, close to the air inlet 19 and the air outlet 18, respectively, to fully utilize the significant temperature difference between the flue gas and the medium in the tube bundle, and to fully recover the waste heat carried by the flue gas with an efficient heat conduction mechanism. This process not only greatly reduces the flue gas temperature, but also realizes the deep recovery and reuse of energy, significantly improving the energy utilization efficiency of the entire system. At the same time, the flue gas collection tube 3's round tube 32 is like a sensitive feeler, and the carefully distributed flue gas collection ports 31 on it are like precise detection points, which collect flue gas samples from every corner and different positions in the economizer in an all-round and non-dead angle manner, providing comprehensive and detailed information for subsequent precise analysis.

[0023] The filter assembly 6 includes a box body 68, a purification assembly is arranged inside the box body 68, a motor 64 is installed on the box body 68, a rotating rod 65 is fixedly connected to the output end of the motor 64, a dust cleaning assembly is arranged outside the rotating rod 65, a drawer 69 is slidably connected inside the box body 68, the purification assembly includes a coarse filter 61, a fine filter 62 is installed inside the box body 68, a fine filter 63 is installed inside the box body 68, the coarse filter 61, the fine filter 62 and the fine filter 63 are arranged inside the box body 68 in order from left to right, the dust cleaning assembly includes a cleaning plate 66, the cleaning plate 66 is installed outside the rotating rod 65, a brush 67 is installed on the cleaning plate 66, two groups of cleaning plates 66 are arranged, and the cleaning plate 66 is rotatably connected inside the box body 68; The collected flue gas flows into the filter 5, and the flue gas first enters the coarse filter 61. With its larger mesh size, it intercepts the coarser particle impurities in the flue gas, effectively preventing them from impacting and clogging the subsequent fine filtering process. Then, the fine filter 62 further plays a role in accurately filtering out the medium-sized particle impurities in the flue gas, and the fine filter 63, with its extremely fine mesh, does not miss any tiny particles and some harmful gas components. Through this progressive and interlocking filtering process, the purity of the flue gas has been greatly improved. The motor 64 is started and stably driven. The rotating rod 65 rotates at a constant speed, and the two groups of cleaning plates 66 carefully arranged on the outside of the rotating rod 65 rotate lightly in the box 68. The soft and tough bristles 67 on the cleaning plate 66 fit tightly with the surface of the filter, and the dust attached to the surface of the filter is swept off one by one during the rotation. The dust falls into the inside of the box 68, and the drawer 69 can be easily pulled out for cleaning. This automatic cleaning mechanism greatly reduces the workload and tediousness of manual maintenance, allowing the filter 5 to maintain efficient and stable filtering performance for a long time, ensuring that there will be no problems with poor flue gas treatment due to filter blockage during the operation of the entire system.

[0024] Please refer to the attached Figure 4 -Attached Figure 6 The regulating component 9 includes a vent 95, which is mounted on the protection box 7, a dust screen 96 is mounted on the protection box 7, a fan 94 is mounted on the inner top of the protection box 7, a sliding component is arranged inside the vent 95, an electric push rod 97 is mounted on the protection box 7, a baffle 98 is fixedly connected to the telescopic end of the electric push rod 97, a humidity sensor 92 is mounted on the inner wall of the protection box 7, heating boxes 99 are arranged on both sides of the protection box 7, a heating wire 93 is mounted on the inner wall of the heating box 99, and a temperature sensor 91 is mounted on the inner wall of the protection box 7; The filtered flue gas smoothly enters the flue gas analyzer 8 in the protection box 7, and the humidity sensor 92 monitors the slight changes in the humidity in the box at all times. Once the humidity exceeds the preset appropriate range, the electric push rod 97 responds quickly, and drives the baffle 98 to smoothly and accurately adjust the opening with the help of the precisely designed sliding component inside the vent 95. At the same time, the fan 94 installed on the top of the protection box 7 is also quickly started to quickly discharge the humid air out of the box, and the heating wire 93 installed on the inner wall of the heating box 99 starts working in time according to the information fed back by the temperature sensor 91 like an "intelligence officer", and heats the air in the box just right. Through this series of precise and coordinated control actions, the temperature in the protection box 7 is stabilized in the ideal range of 20-25℃, and the humidity is strictly controlled in the appropriate range of 40%-60%, ensuring that its internal electronic components are always in the best state of stable performance.

[0025] Please see attached Figure 7 -Attached Figure 8 The anti-blocking component 15 includes a partition 156, which is installed inside the NaOH powder unloading box 17. A stirring component is arranged on the upper side of the partition 156, and an electric unloading valve 157 is installed on the partition 156. An electronic balance 153 is installed at the inner bottom of the NaOH powder unloading box 17. A supply component is arranged on the NaOH powder unloading box 17. The stirring component includes a motor 151, which is installed on the NaOH powder unloading box 17. A stirring rod 152 is fixedly connected to the output end of the motor 151. The supply component includes a storage tank 154, which is fixedly installed on the NaOH powder unloading box 17. A solenoid valve 155 is fixedly installed on the lower side of the storage tank 154. The air compressor 11, the flue gas analyzer 8, the NaOH powder unloading box 17, the solenoid reversing valve 12, the solenoid valve 155, the temperature sensor 91 and the humidity sensor 92 are all electrically connected to the control terminal 10; The flue gas analyzer 8 and the temperature sensor 91 transmit the collected key data to the control terminal 10. The control terminal 10 performs complex and precise calculations based on these data. After accurately obtaining the required amount of NaOH powder, it decisively issues instructions to the NaOH powder discharge box 17. The anti-blocking component 15 inside the NaOH powder discharge box 17 quickly takes action. The motor 151 drives the stirring rod 152 to vigorously stir the NaOH powder stored on the upper side of the partition 156, effectively preventing it from agglomerating due to moisture. The electric discharge valve 157 installed on the partition 156 receives the control terminal. 10, and then the powder is accurately opened and orderly dropped onto the electronic balance 153 installed at the bottom of the box. The electronic balance 153 accurately weighs the weight of the falling powder in real time. When the weight reaches the required amount calculated by the control terminal 10, the electric discharge valve 157 is quickly closed. This process effectively avoids the adverse effects on the anti-corrosion effect caused by too much or too little NaOH powder discharge, prevents insufficient discharge, and also avoids the waste of resources caused by excessive discharge and possible secondary pollution. After the discharge is completed, the air compressor 11 is quickly started and the air is discharged through the air intake pipe. The electromagnetic reversing valve 12 installed on the 13 accurately switches the gas path, and continuously delivers air to the NaOH powder unloading box 17, and then the NaOH powder on the electronic balance 153 is forcefully blown into the NaOH powder injection pipe 4 through the outlet pipe 14. The NaOH powder injection port 42 on the round pipe 41 of the NaOH powder injection pipe 4 uniformly sprays the powder into the economizer body 1. With the flow of flue gas, the powder fully contacts with the sulfuric acid solution on the surface of the rear economizer and the tube bundle, and quickly undergoes a fierce neutralization reaction, which effectively removes sulfuric acid and significantly prolongs the equipment life. The service life of the equipment is extended, and the maintenance cost and replacement frequency of the equipment are reduced. After the preset time, the control terminal 10 controls the electromagnetic reversing valve 12 to switch quickly, so that the air compressor 11 is closely connected with the high-pressure gas nozzle 16 installed inside the economizer body 1. The powerful compressed gas generated by the air compressor 11 is forcefully ejected through the high-pressure gas nozzle 16, and the products after the neutralization reaction and the accumulated ash formed inside the economizer over time are completely flushed away. This process effectively avoids the accumulation of ash on the surface of the heat exchange tube bundle 2 and affects the heat exchange efficiency, and maintains the economizer in good working condition at all times.

[0026] Working principle: When using this device, high-temperature flue gas flows in from the air inlet 19 at the top of the coal burner body 1, and then contacts with two groups of heat exchange tube bundles 2. The heat exchange tube bundles 2 near the air inlet 19 and the air outlet 18 make full use of the temperature difference between the flue gas and the internal medium, and efficiently recover the flue gas waste heat by heat conduction to cool the flue gas. At the same time, the flue gas collection pipe 3's round pipe 32 uses the distributed flue gas collection ports 31 to collect flue gas samples at different positions in the economizer in all directions. The collected flue gas flows into the filter 5, and the purification component of the internal filter component 6 is started. The coarse filter 61 relies on the larger mesh to intercept large particles of impurities, the fine filter 62 further filters the medium-sized impurities, and the fine filter 63 has a fine mesh to capture tiny particles and some harmful gas components. In this way, large particles are filtered layer by layer. The flue gas purity is greatly improved, which effectively protects the downstream flue gas analyzer 8, prolongs its service life and ensures the accuracy of analysis. The motor 64 drives the rotating rod 65 to rotate, driving the two sets of cleaning plates 66 on the outside to rotate in the box body 68. The bristles 67 on the cleaning plate 66 are in close contact with the filter screen to sweep the attached dust into the drawer 69. The drawer 69 can be easily drawn out for cleaning. The filtered flue gas enters the flue gas analyzer 8 in the protective box 7. The adjustment component 9 of the protective box 7 maintains a suitable environment. The humidity sensor 92 monitors the humidity. When the humidity exceeds the range, the electric push rod 97 drives the baffle 98 to adjust the opening through the sliding component inside the vent 95. The fan 94 discharges the humid air. The heating wire 93 in the heating box 99 heats and controls the temperature according to the feedback of the temperature sensor 91, which provides accurate anti-corrosion control. To provide reliable data basis, the flue gas analyzer 8 and the temperature sensor 91 transmit the data to the control terminal 10. The control terminal 10 calculates the required amount of NaOH powder and then issues a command to the NaOH powder unloading box 17. In the internal anti-blocking component 15, the motor 2 151 drives the stirring rod 152 to stir the NaOH powder on the upper side of the partition 156 to prevent moisture and agglomeration. The electric unloading valve 157 opens according to the command, and the powder falls onto the electronic balance 153. The electronic balance 153 weighs in real time. When the required amount is reached, the electric unloading valve 157 is closed to achieve accurate unloading, avoid affecting the anti-corrosion effect due to the deviation of the unloading amount, and prevent waste of resources and secondary pollution. After the unloading is completed, the air compressor 11 is started, and the electromagnetic reversing valve 12 of the air intake pipe 13 switches the gas path to the NaOH powder. The final discharge box 17 delivers air, and then the powder is blown into the NaOH powder injection pipe 4 through the air outlet pipe 14. The NaOH powder injection port 42 on the round pipe 41 sprays the powder into the economizer body 1. The powder flows with the flue gas and fully neutralizes with the sulfuric acid solution on the surface of the rear economizer and the tube bundle, effectively removing sulfuric acid, extending the service life of the heat exchange tube bundle 2 and the economizer body 1, reducing maintenance and replacement costs, and ensuring heat exchange performance and stable operation. After a preset time, the control terminal 10 controls the electromagnetic reversing valve 12 to switch, so that the air compressor 11 is connected to the high-pressure gas nozzle 16, and the compressed gas is ejected through the high-pressure gas nozzle 16. The strong injection force removes the neutralization reaction products and ash accumulation, avoids ash accumulation affecting the heat exchange efficiency, keeps the inside of the equipment clean, and improves energy utilization efficiency.Reduce failures and downtime caused by ash accumulation and reaction product accumulation, and ensure stable and efficient operation of the entire economizer system.

[0027] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant low-temperature economizer, comprising a coal economizer body (1), characterized in that: An air inlet (19) is fixedly provided at the top of the coal burner body (1), an air outlet (18) is provided at the bottom of the coal burner body (1), a heat exchange tube bundle (2) is installed inside the coal burner body (1), a flue gas collection pipe (3) is fixedly installed inside the coal burner body (1), a NaOH powder injection pipe (4) is installed inside the coal burner body (1), a filter (5) is connected to the right side of the flue gas collection pipe (3), a filter assembly (6) is arranged inside the filter (5), a protection box (7) is connected to the right side of the filter (5), a flue gas analyzer (8) is fixedly installed inside the protection box (7), an adjustment assembly (9) is arranged inside the protection box (7), and the protection box (7) is provided with a filter assembly (6). A control terminal (10) is installed on the right side of the protection box (7); an air compressor (11) is connected to the front side of the protection box (7); an air intake pipe (13) is connected to the left end of the air compressor (11); an electromagnetic reversing valve (12) is installed on the air intake pipe (13); a NaOH powder discharge box (17) is fixedly installed at one end of the air intake pipe (13) away from the air compressor (11); an anti-blocking component (15) is arranged inside the NaOH powder discharge box (17); an air outlet pipe (14) is fixedly connected to the left end of the NaOH powder discharge box (17); the air outlet pipe (14) is connected to the coal burner body (1); and a high-pressure gas nozzle (16) is installed inside the coal burner body (1); The filter assembly (6) comprises a box (68), a purification assembly is arranged inside the box (68), a motor 1 (64) is mounted on the box (68), a rotating rod (65) is fixedly connected to the output end of the motor 1 (64), a dust cleaning assembly is arranged outside the rotating rod (65), and a drawer (69) is slidably connected to the inside of the box (68).

2. The corrosion-resistant low-temperature economizer according to claim 1, characterized in that: The purification component comprises a coarse filter (61), a fine filter (62) is installed inside the box (68), and a fine filter (63) is installed inside the box (68), wherein the coarse filter (61), the fine filter (62) and the fine filter (63) are installed inside the box (68) in order from left to right.

3. The corrosion-resistant low-temperature economizer according to claim 1, characterized in that: The dust cleaning assembly comprises a cleaning plate (66), the cleaning plate (66) being mounted on the outside of a rotating rod (65), bristles (67) being mounted on the cleaning plate (66), two groups of cleaning plates (66) being provided, and the cleaning plates (66) being rotatably connected to the inside of a box body (68).

4. The corrosion-resistant low-temperature economizer according to claim 1, characterized in that: The regulating component (9) comprises a vent (95), the vent (95) being mounted on a protective box (7), a dust screen (96) being mounted on the protective box (7), a fan (94) being mounted on the inner top of the protective box (7), a sliding component being arranged inside the vent (95), an electric push rod (97) being mounted on the protective box (7), a baffle (98) being fixedly connected to the telescopic end of the electric push rod (97), a humidity sensor (92) being mounted on the inner wall of the protective box (7), heating boxes (99) being mounted on both sides of the interior of the protective box (7), heating wires (93) being mounted on the inner wall of the heating boxes (99), and a temperature sensor (91) being mounted on the inner wall of the protective box (7).

5. The corrosion-resistant low-temperature economizer according to claim 1, characterized in that: The anti-blocking component (15) comprises a partition (156), the partition (156) is installed inside a NaOH powder discharge box (17), a stirring component is arranged on the upper side of the partition (156), an electric discharge valve (157) is installed on the partition (156), an electronic balance (153) is installed on the inner bottom of the NaOH powder discharge box (17), and a supply component is arranged on the NaOH powder discharge box (17).

6. The corrosion-resistant low-temperature economizer according to claim 5, characterized in that: The stirring assembly comprises a second motor (151), the second motor (151) being mounted on a NaOH powder feed box (17), and a stirring rod (152) being fixedly connected to an output end of the second motor (151).

7. The corrosion-resistant low-temperature economizer according to claim 5, characterized in that: The supply assembly comprises a storage tank (154), wherein the storage tank (154) is fixedly mounted on a NaOH powder discharge box (17), and a solenoid valve (155) is fixedly mounted on the lower side of the storage tank (154).

8. The corrosion-resistant low-temperature economizer according to claim 1, characterized in that: The flue gas collection pipe (3) comprises a meandering pipe (32) on which a flue gas collection port (31) is mounted, and the NaOH powder injection pipe (4) comprises a meandering pipe member (41) on which a NaOH powder injection port (42) is mounted.

9. The corrosion-resistant low-temperature economizer according to claim 1, characterized in that: The air compressor (11), the flue gas analyzer (8), the NaOH powder discharge box (17), the electromagnetic reversing valve (12), the electromagnetic valve (155), the temperature sensor (91) and the humidity sensor (92) are all electrically connected to the control terminal (10).

10. The corrosion-resistant low-temperature economizer according to claim 1, characterized in that: The heat exchange tube bundle (2) is provided in two groups, and the two groups of heat exchange tube bundles (2) are respectively close to the air inlet (19) and the air outlet (18) of the economizer body (1).

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