Boiler combustion flue gas recirculation device
By using a boiler combustion flue gas recirculation device, and employing water film dust collectors, electrostatic precipitators, and bag filters to treat the flue gas, the problems of boiler fuel accumulation and excessive flue gas emissions have been solved. This has achieved effective recycling of flue gas and environmentally friendly emissions, thus achieving the goal of energy conservation and emission reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- MENGLA MENGPENG SUGAR IND CO LTD
- Filing Date
- 2025-04-30
- Publication Date
- 2026-05-05
AI Technical Summary
During sugarcane production, fuel buildup in the boiler grate leads to blockage of the holes, frequent decoking, unstable boiler operation, excessive nitrogen oxides in the flue gas, posing environmental hazards, and high oxygen levels in the flue gas, resulting in substandard pollutant emissions.
Design a boiler combustion flue gas recirculation device. The flue gas is treated by a water film dust collector and an electrostatic precipitator. The treated flue gas can be discharged or recycled. The flue gas from boiler No. 2 is treated by a bag filter and then reused in boiler No. 1. Bottom air intake prevents fuel accumulation. Combined with a circulating fan and a blower, the flue gas can be recycled.
It effectively reduced emissions of nitrogen oxides, particulate matter, and sulfur dioxide from boiler flue gas, keeping them below environmental standards, and reduced the total flow of boiler flue gas, thus achieving energy conservation and emission reduction.
Smart Images
Figure CN224201728U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of sugarcane production equipment. Specifically, this utility model relates to a boiler combustion flue gas recirculation device. Background Technology
[0002] Sucrose, the main component of sugar, is a disaccharide (diose) widely found in plants in nature, with the molecular formula C6H2O. 12 H 22 O 11 Sucrose, sweet in taste and providing energy to the human body, is a white, odorless crystalline or powdery solid, readily soluble in water and methanol; slightly soluble in ethanol; and insoluble in ether. It is formed by the dehydration condensation of one molecule of glucose and one molecule of fructose, and undergoes caramelization at temperatures between 150°C and 200°C. In the human digestive system, it is broken down by digestive juices into fructose and glucose, which are absorbed through the small intestine to provide energy. Sucrose is almost universally found in the leaves, flowers, stems, seeds, and fruits of plants; it is particularly abundant in sugarcane, sugar beets, and maple sap. Sucrose is an important food and sweetener, available in various forms such as white granulated sugar, brown sugar, fine white sugar, rock sugar, and raw sugar (yellow sugar). In cooking, it serves to flavor, color, adjust the texture of ingredients, prevent graininess and sugar strands, sterilize and preserve, and regulate fermentation speed. In the pharmaceutical field, it is used as a diluent, flavoring agent, binder, and coating material; sucrose has a wide range of applications.
[0003] The boilers used in sugar production suffer from insufficient pressure in the air preheater before reaching the grate, preventing the fuel from being properly propelled. Fuel accumulates on the grate, causing blockages and eventually coking. This necessitates extensive manual decoking every shift, during which the boiler cannot operate normally, resulting in unstable steam supply. Furthermore, nitrogen oxide levels in the boiler flue gas remain consistently high, ranging from 250 mg / m³ to 350 mg / m³. Even slight operator error can cause hourly average nitrogen oxide levels to exceed the standard (<300 mg / m³), posing a significant environmental hazard. The residual oxygen levels after combustion in the air furnace are also excessive, exceeding the 9% baseline oxygen content required by environmental regulations. This results in abnormally high or even excessive levels of particulate matter, nitrogen oxides, and sulfur dioxide, calculated based on oxygen content. Summary of the Invention
[0004] To overcome the problems existing in the background technology, this utility model discloses a boiler combustion flue gas recirculation device. The flue gas generated in the No. 1 boiler of the boiler combustion flue gas recirculation device is treated by a water film dust collector and an electrostatic precipitator. After the flue gas treatment meets the standards, it is discharged outside through the chimney on the top surface of the first induced draft fan or recovered from the exhaust pipe. The flue gas generated in the No. 2 boiler is discharged from the second flue gas pipe and enters the bag filter for treatment. The treated flue gas is then recycled back to the No. 1 boiler after passing through the second induced draft fan and the flue gas recirculation pipe. Boilers No. 1 and No. 2 have bottom air intakes to lift materials and prevent fuel accumulation. After treatment, the measured hourly average value of nitrogen oxides in the flue gas generated by boilers No. 1 and No. 2 remains below 220 mg / m³. The particulate matter, nitrogen oxides, and sulfur dioxide, after being converted according to the oxygen content, are lower than the measured values. The total flow rate of boiler flue gas in boilers No. 1 and No. 2 is reduced by 30,000 m³ / h, truly achieving the effect of energy saving and emission reduction.
[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:
[0006] The boiler combustion flue gas recirculation device is characterized by comprising: a No. 1 boiler, a first flue gas outlet pipe, a water film dust collector, a first connecting pipe, an electrostatic precipitator, a second connecting pipe, a first induced draft fan, a No. 2 boiler, a second flue gas outlet pipe, a bag filter, a third connecting pipe, a second induced draft fan, and a flue gas recirculation pipe; the No. 1 boiler is connected to the water film dust collector through the first flue gas outlet pipe, the water film dust collector is connected to the electrostatic precipitator through the first connecting pipe, the electrostatic precipitator is connected to the first induced draft fan through the second connecting pipe, and a bottom of the No. 1 boiler is equipped with... An air inlet pipe is provided, and a blower is installed on the pipe body of the air inlet pipe; the No. 2 boiler is connected to the bag filter through the second flue gas outlet pipe, the bag filter is connected to the second induced draft fan through the third connecting pipe, the second induced draft fan is connected to the flue gas circulation pipe, one end of the flue gas circulation pipe is connected to the second induced draft fan, and the other end of the flue gas circulation pipe is connected to the air inlet pipe at the bottom of the No. 1 boiler, and a first circulation fan and a second circulation fan are installed on the pipe body of the flue gas circulation pipe. An air inlet pipe is provided at the bottom of the No. 2 boiler, and a blower is installed on the pipe body of the air inlet pipe.
[0007] As a preferred embodiment, the system includes an air inlet pipe and a blower; the air inlet pipe is installed on the bottom surface of boiler No. 1 and boiler No. 2, and the blower is installed on the pipe body of the air inlet pipe.
[0008] As a preferred embodiment, the device includes: an inlet pipe, an overflow pipe, and a drain pipe; the inlet pipe is located on the top surface of the water film dust collector, the overflow pipe is located on the side surface of the water film dust collector, and the drain pipe is located on the bottom surface of the water film dust collector.
[0009] As a preferred embodiment, the device includes a horizontal pipe and a spray head; the horizontal pipe is disposed inside the water film dust collector and is connected to the water inlet pipe, and the spray head is disposed on the bottom surface of the horizontal pipe.
[0010] As a preferred embodiment, the device includes: an electrode plate, a power supply, and a dust discharge pipe; the electrode plate is disposed inside the electrostatic precipitator, the dust discharge pipe is disposed on the bottom surface of the electrostatic precipitator, the power supply is disposed on the top surface of the electrostatic precipitator, and the power supply is connected to the electrode plate.
[0011] As a preferred embodiment, the dust collector includes: a blowpipe, a blow nozzle, a filter bag, and an ash discharge pipe; the filter bag is disposed inside the baghouse dust collector, the blowpipe is disposed inside the baghouse dust collector, the blowpipe is located above the filter bag, the blow nozzle is disposed on the bottom surface of the blowpipe, and the ash discharge pipe is disposed on the bottom surface of the baghouse dust collector.
[0012] As a preferred embodiment, the fan includes: a base, a shock-absorbing spring, an exhaust pipe, and a chimney; the base is located at the bottom of the first induced draft fan, the shock-absorbing spring is located between the base and the first induced draft fan, the exhaust pipe is located on the side of the first induced draft fan, and the chimney is located on the top surface of the first induced draft fan.
[0013] Preferably, the system includes a first circulating fan and a second circulating fan; the first circulating fan and the second circulating fan are installed on the pipe body of the flue gas circulation pipe.
[0014] The beneficial effects of this utility model are as follows: The flue gas generated in the No. 1 boiler of the boiler combustion flue gas recirculation device is treated by a water film dust collector and an electrostatic precipitator. After the flue gas treatment meets the standards, it is discharged through the chimney on the top surface of the first induced draft fan or recovered from the outlet pipe. The flue gas generated in the No. 2 boiler is discharged from the second flue gas pipe and enters the bag filter for treatment. The treated flue gas is then recycled back to the No. 1 boiler after passing through the second induced draft fan and the flue gas recirculation pipe. The bottom air intake of the No. 1 and No. 2 boilers lifts the material and avoids fuel accumulation. After treatment, the measured hourly average value of nitrogen oxides in the flue gas generated by the No. 1 and No. 2 boilers remains below 220 mg / m³. The particulate matter, nitrogen oxides, and sulfur dioxide, after being converted according to the oxygen content, are lower than the measured values. The total flow rate of the boiler flue gas of the No. 1 and No. 2 boilers is reduced by 30,000 m³ / h, truly achieving the effect of energy saving and emission reduction. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of this utility model;
[0016] Figure 2 This is a schematic diagram of a water film dust collector.
[0017] Figure 3 This is a schematic diagram of the structure of an electrostatic precipitator;
[0018] Figure 4 This is a schematic diagram of a bag filter dust collector.
[0019] In the diagram, 1 is Boiler No. 1, 2 is First Flue Gas Outlet Pipe, 3 is Water Film Dust Collector, 4 is First Connecting Pipe, 5 is Electrostatic Precipitator, 6 is Second Connecting Pipe, 7 is First Exhaust Fan, 8 is Boiler No. 2, 9 is Second Flue Gas Outlet Pipe, 10 is Bag Filter, 11 is Third Connecting Pipe, 12 is Second Exhaust Fan, 13 is Flue Gas Circulation Pipe, 14 is Circulating Fan, 15 is Air Inlet Pipe, 16 is Blower, 17 is Water Inlet Pipe, 18 is Overflow Pipe, 19 is Sewage Discharge Pipe, 20 is Power Supply, 21 is Dust Discharge Pipe, 22 is Base, 23 is Shock Absorbing Spring, 24 is Air Outlet Pipe, 25 is Chimney, 26 is Ash Discharge Pipe, 27 is Pulse Jet Pipe, 28 is Horizontal Pipe Body, 29 is Spray Head, 30 is Electrode Plate, 31 is Pulse Jet Nozzle, and 32 is Filter Bag. Detailed Implementation
[0020] To make the above objectives, technical solutions and beneficial effects clearer and more explicit, the present invention will be described in detail below with reference to the accompanying drawings.
[0021] like Figure 1-4 As shown, the boiler combustion flue gas recirculation device includes: No. 1 boiler 1, first flue gas outlet pipe 2, water film dust collector 3, first connecting pipe 4, electrostatic precipitator 5, second connecting pipe 6, first induced draft fan 7, No. 2 boiler 8, second flue gas outlet pipe 9, bag filter dust collector 10, third connecting pipe 11, second induced draft fan 12, and flue gas recirculation pipe 13;
[0022] The No. 1 boiler 1 is connected to the water film dust collector 3 through the first flue gas outlet pipe 2. The water film dust collector 3 is connected to the electrostatic precipitator 5 through the first connecting pipe 4. The electrostatic precipitator 5 is connected to the first induced draft fan 7 through the second connecting pipe 6. An air inlet pipe 15 is provided at the bottom of the No. 1 boiler 1, and a blower 16 is provided on the pipe body of the air inlet pipe 15.
[0023] The No. 2 boiler 8 is connected to the bag filter 10 through the second flue gas outlet pipe 9. The bag filter 10 is connected to the second induced draft fan 12 through the third connecting pipe 11. The second induced draft fan 12 is connected to the flue gas circulation pipe 13. One end of the flue gas circulation pipe 13 is connected to the second induced draft fan 12, and the other end of the flue gas circulation pipe 13 is connected to the air inlet pipe 15 at the bottom of the No. 1 boiler 1. A circulating fan 14 and a second circulating fan 15 are installed on the pipe body of the flue gas circulation pipe 13. An air inlet pipe 15 is installed at the bottom of the No. 2 boiler 8, and a blower 16 is installed on the pipe body of the air inlet pipe 15.
[0024] The first induced draft fan 7 is provided with a base 22 at its bottom. A shock-absorbing spring 23 is provided between the base 22 and the induced draft fan body. A chimney 25 is provided on the top surface of the first induced draft fan 7. An exhaust pipe 24 is connected to the side of the first induced draft fan 7. The first induced draft fan 7 and the second induced draft fan 12 have the same structure. A flue gas circulation pipe 13 is connected to the side of the second induced draft fan 12.
[0025] The water film dust collector 3 is provided with a water inlet pipe 17 on the top surface. The water inlet pipe 17 is connected to a horizontal pipe body 28 at the pipe opening inside the water film dust collector 3. A spray head 29 is provided on the bottom surface of the horizontal pipe body 28. An overflow pipe 18 is provided on the side of the water film dust collector 3. A sewage pipe 19 is provided on the bottom surface of the water film dust collector 3. The water film dust collector 3 uses the water sprayed from the spray head 29 to create a water film. The dust in the flue gas is captured by the water film, and the flue gas is purified.
[0026] The flue gas purified by the water film dust collector 3 enters the electrostatic precipitator 5 for treatment. The electrostatic precipitator 5 is equipped with an electrode plate 30, and the top surface of the electrode plate 30 is connected to a power supply 20. The bottom of the electrostatic precipitator 5 is equipped with a dust outlet pipe 21. The electrostatic precipitator 5 uses electrostatic force to remove dust from the flue gas. The flue gas generated by the No. 1 boiler 1 is treated by the water film dust collector and the electrostatic precipitator 5. After the treatment meets the standards, it is discharged through the chimney 25 on the top surface of the first induced draft fan 7 or recovered from the exhaust pipe 24.
[0027] The flue gas generated in Boiler 2 (8) is discharged from the second flue gas pipe and enters the bag filter 10 for treatment. A blowpipe 27 is installed on the side of the bag filter 10. The blowpipe 27 is located inside the bag filter 10 and connected to the blow nozzle 31 on the bottom surface of the pipe body. The filter bag 32 is installed inside the bag filter 10 and is located below the blow nozzle 31. The blow nozzle 31 can blow down the floating dust. The dust is recovered from the ash discharge pipe 26. The treated flue gas is recycled back to Boiler 1 (1) after passing through the second induced draft fan 12 and the flue gas circulation pipe 13. Boiler 1 (1) and Boiler 2 (8) have bottom air intakes to lift the material and prevent fuel accumulation.
[0028] The boiler flue gas is treated using a boiler combustion flue gas recirculation device. The flue gas generated in Boiler 1 is treated by a water film dust collector 3 and an electrostatic precipitator 5. After the flue gas meets the standards, it is discharged through the chimney 25 on the top surface of the first induced draft fan 7 or recovered from the outlet pipe 24. The flue gas generated in Boiler 2 is discharged from the second flue gas pipe and enters the bag filter 10 for further treatment. The treated flue gas is then recycled back to Boiler 1 after passing through the second induced draft fan 12 and the flue gas recirculation pipe 13. After treatment, Boiler 1... 1. The measured hourly average nitrogen oxide content of the flue gas generated by Boiler 8 of No. 1 remained below 220 mg / m³. After combustion with oxygen in the furnace, the average oxygen content was 5%. After online monitoring at the chimney, the oxygen content was still lower than the environmental management requirement of 9% baseline oxygen content. The final average oxygen content of the flue gas was 8%. The particulate matter, nitrogen oxides, and sulfur dioxide were lower than the measured values after conversion based on the oxygen content. The total flue gas flow of Boiler 1 and Boiler 8 of No. 2 was reduced by 30,000 m³ / h, truly achieving the effect of energy conservation and emission reduction.
[0029] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of this utility model.
Claims
1. A boiler combustion flue gas recirculation device, characterized in that, include: No. 1 boiler, first flue gas outlet pipe, water film dust collector, first connecting pipe, electrostatic precipitator, second connecting pipe, first induced draft fan, No. 2 boiler, second flue gas outlet pipe, bag filter, third connecting pipe, second induced draft fan, flue gas circulation pipe; The No. 1 boiler is connected to the water film dust collector through the first flue gas outlet pipe, the water film dust collector is connected to the electrostatic precipitator through the first connecting pipe, the electrostatic precipitator is connected to the first induced draft fan through the second connecting pipe, and an air inlet pipe is provided at the bottom of the No. 1 boiler, with a blower installed on the pipe body of the air inlet pipe. The No. 2 boiler is connected to the bag filter through the second flue gas outlet pipe. The bag filter is connected to the second induced draft fan through the third connecting pipe. The second induced draft fan is connected to the flue gas circulation pipe. One end of the flue gas circulation pipe is connected to the second induced draft fan, and the other end of the flue gas circulation pipe is connected to the air inlet pipe at the bottom of the No. 1 boiler. The flue gas circulation pipe is equipped with a first circulation fan and a second circulation fan. The No. 2 boiler is equipped with an air inlet pipe, and a blower is equipped with the air inlet pipe.
2. The boiler combustion flue gas recirculation device according to claim 1, characterized in that, include: Air inlet pipe and blower; the air inlet pipe is installed on the bottom surface of boiler No. 1 and boiler No. 2, and the blower is installed on the pipe body of the air inlet pipe.
3. The boiler combustion flue gas recirculation device according to claim 1, characterized in that, include: The water inlet pipe, overflow pipe, and sewage discharge pipe are provided. The water inlet pipe is located on the top surface of the water film dust collector, the overflow pipe is located on the side surface of the water film dust collector, and the sewage discharge pipe is located on the bottom surface of the water film dust collector.
4. A boiler combustion flue gas recirculation device according to claim 3, characterized in that, include: The horizontal pipe body and the spray head are arranged inside the water film dust collector and are connected to the water inlet pipe. The spray head is arranged on the bottom surface of the horizontal pipe body.
5. A boiler combustion flue gas recirculation device according to claim 1, characterized in that, include: Electrode plate, power supply, and dust discharge pipe; the electrode plate is installed inside the electrostatic precipitator, the dust discharge pipe is installed on the bottom surface of the electrostatic precipitator, the power supply is installed on the top surface of the electrostatic precipitator, and the power supply is connected to the electrode plate.
6. A boiler combustion flue gas recirculation device according to claim 1, characterized in that, include: The dust collector includes a blowpipe, a blow nozzle, a filter bag, and an ash discharge pipe. The filter bag is installed inside the baghouse dust collector, the blowpipe is installed inside the baghouse dust collector with the blowpipe located above the filter bag, the blow nozzle is located on the bottom surface of the blowpipe, and the ash discharge pipe is located on the bottom surface of the baghouse dust collector.
7. A boiler combustion flue gas recirculation device according to claim 1, characterized in that, include: The components include a base, a shock-absorbing spring, an exhaust pipe, and a chimney. The base is located at the bottom of the first induced draft fan, the shock-absorbing spring is located between the base and the first induced draft fan, the exhaust pipe is located on the side of the first induced draft fan, and the chimney is located on the top surface of the first induced draft fan.
8. A boiler combustion flue gas recirculation device according to claim 1, characterized in that, include: First circulating fan, second circulating fan; The first circulating fan and the second circulating fan are installed on the pipe body of the flue gas circulation pipe.