Biomass circulating fluidized bed hot blast stove capable of burning multiple fuels
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- RONGXUN ENVIRONMENTAL TECH (BEIJING) CO LTD
- Filing Date
- 2025-09-16
- Publication Date
- 2026-08-07
AI Technical Summary
[0003]本申请实施例通过提供一种可掺烧多种燃料的生物质循环流化床热风炉，解决了现有技术中设备可靠性低、以及因工厂生产过程中会产生一些无法循环利用且具有一定热值的工业废气和工业废弃物资，这些废弃物资如果随意排放处理会对环境造成严重危害的问题
通过设置的生物质料仓和工业废料料仓，既可以产生热风产生又可以将工厂生产过程的低热值的废物、废气焚烧处理，具有燃料宽泛适应性、极高的低碳、低氮、低排放、综合物利用、循环经济良好的环境友好性。
Smart Images
Figure CN224607876U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hot blast stove technology, and in particular to a biomass circulating fluidized bed hot blast stove that can be used to burn multiple fuels. Background Technology
[0002] Hot blast furnaces are important thermal power equipment widely used in agriculture, agricultural and food processing, papermaking, metallurgy, chemical industry, building materials, and other industries. They are the main power equipment for providing high-temperature hot air for decomposing, drying, and heating materials in production processes. Hot blast furnaces primarily use coal, oil, gas, and electric boilers as fuel. Existing hot blast furnaces typically lack heating surfaces within the furnace chamber, have high internal temperatures, and are difficult to operate and control, resulting in short lifespans for furnace walls, roofs, and heat exchangers, and low equipment reliability. Factory production processes often generate industrial waste gases and materials with a certain calorific value that cannot be recycled. Improper disposal of these waste materials can cause serious environmental damage, while separate treatment requires significant land use and incurs high costs. Therefore, to address these issues, a biomass circulating fluidized bed hot blast furnace capable of co-firing various industrial waste gases and materials as fuel is proposed. Utility Model Content
[0003] This application provides a biomass circulating fluidized bed hot blast stove that can be used to burn multiple fuels, which solves the problems of low equipment reliability in the prior art, and the fact that some industrial waste gases and industrial waste materials with certain calorific value are generated during the factory production process that cannot be recycled. If these waste materials are discharged and disposed of indiscriminately, they will cause serious harm to the environment.
[0004] This application provides a biomass circulating fluidized bed hot blast stove that can be co-fired with multiple fuels, including a hot blast stove furnace and a flue gas recirculation system, as well as a biomass silo and an industrial waste silo. The top of the biomass silo is equipped with a biomass silo conveyor, which is a belt conveyor. The bottom of the biomass silo is connected to a biomass screw feeder via a pipe. The biomass screw feeder consists of two layers of multiple shaftless screw feeders, with the axes of the upper and lower shaftless screw feeders arranged in a cross shape. The bottom of the biomass screw feeder is connected to a discharge pipe, and the empty end of the discharge pipe extends into the furnace of the hot air furnace. An industrial waste conveyor is installed on the top of the industrial waste silo, and an industrial waste screw feeder is connected to the bottom of the industrial waste silo through a feeding pipe. The bottom of the industrial waste screw feeder is connected to a conveying pipe, and the empty end of the conveying pipe extends into the furnace of the hot air furnace. An industrial waste gas burner is fixed to the side of the hot blast furnace. The industrial waste gas burner is a low-NOx burner, and one end of the industrial waste gas burner extends into the hot blast furnace.
[0005] Furthermore, an industrial waste crusher is installed on the top of the industrial waste silo. The industrial waste crusher is used to crush industrial waste, and the industrial waste conveyor is located at the discharge port of the industrial waste crusher. The industrial waste hopper has two parallel gas soft bags fixed inside. Each gas soft bag is covered with fiberglass cloth, and each gas soft bag has a crushing plate fixed at its empty end. An air pump is fixed to the outside of the industrial waste silo. The air pump's outlet is connected to an air inlet pipe. Two ventilation pipes are connected to the air inlet pipe, and the empty end of one ventilation pipe extends into a gas soft bag.
[0006] Furthermore, two parallel gas soft bags II are fixed inside the industrial waste hopper, and the gas soft bags II are located directly below the gas soft bags I. Each gas soft bag II is covered with fiberglass cloth. Each of the gas soft capsules has a broken plate fixed to its empty end, and two ventilation pipes are fixed on the air inlet pipe. The empty end of one ventilation pipe is connected to one gas soft capsule.
[0007] Furthermore, an air supply pipe is fixed to the side of the industrial waste silo, and two air vents are connected to the air outlet of the air supply pipe, while the air inlet of the air supply pipe is connected to a charging and decharging pump. The gas soft capsule one and the gas soft capsule two expand and contract alternately.
[0008] Furthermore, the flue gas recirculation system includes a slag condensation pipe, a primary cyclone separator, a secondary separator, a hot flue gas thermal power equipment, a multi-tube dust collector A, a bag filter A, an induced draft fan A, and a chimney A; The slag-forming pipe is fixed to one side of the top of the hot blast stove furnace. The hot blast stove furnace and the primary cyclone separator are connected by a primary horizontal flue. The primary cyclone separator and the secondary separator are connected by a secondary horizontal flue. The bottom of the primary cyclone separator is connected to the feeding area inside the hot blast furnace through a primary return feeder, and the bottom of the secondary separator is connected to the feeding area inside the hot blast furnace through a secondary return feeder. The secondary separator is equipped with a hot flue gas outlet pipe at the top, which is connected to the hot flue gas thermal power equipment through a flue. A temperature regulating damper is installed on the flue. The hot flue gas thermal power equipment is connected to the multi-tube dust collector A through a pipeline, the multi-tube dust collector A is connected to the bag filter A through a pipeline, the bag filter A is connected to the induced draft fan A through a pipeline, and the exhaust end of the induced draft fan A is connected to the inside of the chimney A. The duct connecting the bag filter A and the induced draft fan A is provided with a flue gas recirculation duct outlet and a regulating damper in the middle. The bag filter A and the induced draft fan A are connected to the inlet of the recirculation fan A through a recirculation duct. Two branch pipes are connected to the recirculation duct. One branch pipe is connected to the temperature regulating nozzle at the top of the hot blast furnace, and the other branch pipe is connected to the air distribution chamber at the bottom of the hot blast furnace.
[0009] Furthermore, a ventilation pipe is connected to the branch pipe near the temperature regulating nozzle. An on / off valve is fixed on the ventilation pipe. There are two air outlet pipes on the unused end of the ventilation pipe. One air outlet pipe is connected to the inside of the industrial waste screw feeder, and the other air outlet pipe is connected to the inside of the biomass screw feeder.
[0010] Furthermore, a pure air heat exchanger is installed at the bottom of the hot flue gas outlet pipe. The pure air heat exchanger is used to provide high-temperature hot air to the pure air thermal equipment that requires pure hot air. The pure air thermal equipment is fixed on one side of the hot flue gas outlet pipe. The bottom of the hot flue gas outlet pipe is equipped with a secondary air preheater and a primary air fan preheater, and the secondary air preheater and the primary air fan preheater are located below the pure gas heat exchanger. The secondary air preheater is connected to the secondary air duct through a pipe. The jet outlet of the secondary air duct is located inside the furnace of the hot blast stove. The primary air preheater is connected to the air distribution chamber at the bottom of the furnace of the hot blast stove through the primary air duct. The outlet of the secondary air preheater is connected to a secondary air fan, the outlet of the primary air preheater is connected to a primary air fan, and a heater is connected between the primary air fan and the secondary air fan. The bottom of the hot flue gas outlet pipe is connected to a multi-tube dust collector B through a flue. The multi-tube dust collector B is connected to a bag filter B through a pipe. The bag filter B is connected to the inlet of the induced draft fan B through a flue. The outlet of the induced draft fan B is connected to the chimney B through a flue. A flue gas inlet pipe is connected to the pipe between the induced draft fan B and the chimney B. The flue gas inlet pipe is connected to the inlet of the flue gas recirculation fan B. The flue gas recirculation fan B is connected to another branch pipe through a pipe.
[0011] Furthermore, a slag cooler is installed below the furnace of the hot blast stove. The slag cooler is used to cool the waste slag discharged from the furnace of the hot blast stove and send it to the inlet of the heater through a pipeline.
[0012] Furthermore, a natural gas burner is fixed on the side of the hot blast furnace near the industrial waste gas burner. The natural gas burner is a low-NOx burner, which provides auxiliary combustion for the hot blast furnace.
[0013] Furthermore, an SNCR denitrification device is installed on the side of the hot blast stove furnace. The SNCR denitrification device is a flue gas denitrification device that sprays diluted urea solution into the flue gas at 750℃-900℃ in the hot blast stove furnace after atomizing it with compressed air, so as to remove the nitrogen oxides in the flue gas by reducing them.
[0014] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: By setting up biomass silos and industrial waste silos, it can generate hot air and incinerate low-calorific-value waste and exhaust gas from the factory production process. It has wide fuel adaptability, extremely high low carbon, low nitrogen, low emissions, comprehensive material utilization, and good environmental friendliness of circular economy. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the biomass circulating fluidized bed hot blast stove that can be co-fired with multiple fuels according to this utility model. Figure 2 This is a schematic diagram showing the positional relationship between the industrial waste silo and the industrial waste screw feeder in the biomass circulating fluidized bed hot air furnace that can be used to burn multiple fuels, according to this utility model. Figure 3 This is a schematic cross-sectional view of the industrial waste silo structure of the biomass circulating fluidized bed hot air furnace that can be co-fired with multiple fuels according to this utility model. Figure 4 This is a top-view cross-sectional structural diagram of the industrial waste silo of the biomass circulating fluidized bed hot air furnace that can be co-fired with multiple fuels according to this utility model. Figure 5 This is a schematic diagram of the simultaneous expansion and contraction of gas soft bladder one and gas soft bladder two in the biomass circulating fluidized bed hot blast stove that can be co-fired with multiple fuels according to this utility model. Figure 6 This is a schematic diagram of the alternating expansion and contraction of gas soft bladder one and gas soft bladder two in the biomass circulating fluidized bed hot blast stove that can be used to burn multiple fuels according to this utility model.
[0016] In the diagram: 1. Hot blast stove furnace; 2. Slag collection pipe; 3. Primary horizontal flue; 4. Primary cyclone separator; 5. Primary return feeder; 6. Secondary horizontal flue; 7. Secondary separator; 8. Secondary return feeder; 9. Hot flue gas outlet pipe; 10. Hot flue gas thermal power equipment; 11. Multi-tube dust collector A; 12. Bag filter A; 13. Exhaust fan A; 14. Chimney A; 16. Pure air heat exchanger; 17. Pure air thermal power equipment; 19. 20. Secondary air duct; 21. Secondary air preheater; 22. Secondary air fan; 23. Primary air duct; 24. Primary air fan preheater; 25. Primary air fan; 26. Warm air heater; 27. Multi-tube dust collector B; 28. Bag dust collector B; 29. Exhaust fan B; 30. Chimney B; 31. Flue gas recirculation fan B; 32. Recirculation fan A; 33. Slag condensation pipe circulation pump; 34. Temperature regulating nozzle; 35. Slag cooler circulation pump; 36. Slag cooler; 36. Biomass silo conveyor; 37. Biomass silo; 38. Biomass screw feeder; 39. Industrial waste conveyor; 391. Industrial waste crusher; 40. Industrial waste silo; 401. Air inlet pipe; 402. Ventilation pipe one; 403. Gas soft bag one; 4031. Crushing plate one; 404. Gas soft bag two; 4041. Crushing plate two; 405. Feeding pipe; 406. Ventilation pipe two; 407. Air supply pipe; 41. Industrial waste screw feeder; 411. Conveying pipe; 42. Natural gas burner; 43. Industrial waste gas burner; 44. SNCR denitrification device; 45. Temperature regulating damper; 46. Ventilation duct. Detailed Implementation
[0017] To facilitate understanding of this utility model, a more comprehensive description of this application will be given below with reference to the accompanying drawings, which show preferred embodiments of the utility model. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to enable a more thorough and complete understanding of the disclosure of this utility model.
[0018] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.
[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0020] like Figure 1 As shown, this application provides a biomass circulating fluidized bed hot blast stove that can be co-fired with multiple fuels, including a hot blast stove furnace chamber 1 and a flue gas recirculation system. The hot blast stove furnace chamber 1 is arranged in a Π shape and is built on a steel structure platform and supported by a steel frame. The hot blast stove furnace chamber 1 is enclosed by walls to form an empty tower structure. The furnace walls are constructed with a layer of high-temperature refractory material on the inner side and the outer side, with one to two layers of insulating bricks and expansion filler in the middle, and red bricks on the outer side. The flue gas recirculation system is used to recycle and recover the flue gas to achieve a recycling effect. It also includes a biomass silo 37 and an industrial waste silo 40. The top of the biomass silo 37 is equipped with a biomass silo conveyor 36, which is a belt conveyor. The biomass bulk material from the external material yard is sent into the biomass silo 37 through the biomass silo conveyor 36. The bottom of the biomass silo 37 is connected to a biomass screw feeder 38 via a pipe. The biomass screw feeder 38 consists of two layers of multiple shaftless screw feeders. The axes of the upper and lower shaftless screw feeders are arranged in a cross shape, and each screw feeder rotates in opposite directions, which can effectively prevent material entanglement, jamming, and smoke from rising. The biomass screw feeder 38 is equipped with an electronic scale, which has a weighing and measurement function. The bottom of the biomass screw feeder 38 is connected to a feeding pipe, and the empty end of the feeding pipe extends into the furnace chamber 1 of the hot blast stove. The biomass screw feeder 38 feeds the bulk biomass into the feeding area of the furnace chamber 1 of the hot blast stove. The industrial waste silo 40 is equipped with an industrial waste conveyor 39 on its top. The industrial waste is fed into the industrial waste silo 40 by the industrial waste conveyor 39. The bottom of the industrial waste silo 40 is connected to an industrial waste screw feeder 41 through a feeding pipe 405. The industrial waste screw feeder 41 is equipped with an electronic scale and has weighing and measurement functions. The bottom of the industrial waste screw feeder 41 is connected to a conveying pipe 411, and the empty end of the conveying pipe 411 extends into the furnace chamber 1 of the hot blast furnace. The industrial waste is fed from the conveying pipe 411 into the feeding area of the furnace chamber 1 of the hot blast furnace through the industrial waste screw feeder 41. An industrial waste gas burner 43 is fixed on the side of the hot air furnace chamber 1. The industrial waste gas burner 43 is a low-NOx burner. One end of the industrial waste gas burner 43 extends into the hot air furnace chamber 1. The industrial waste gas is burned at high temperature by the industrial waste gas burner 43, which decomposes the contained materials into harmless substances and recovers heat and discharges along with the flue gas.
[0021] In the above embodiments, the fuel is mainly biomass bulk material, supplemented by natural gas, industrial fuel gas, low-calorific-value industrial waste, and low-calorific-value industrial exhaust gas. The fuel is mixed and burned in the furnace 1 of the hot air furnace. This process can generate hot air and incinerate low-calorific-value waste and exhaust gas from the factory production process. It has wide fuel adaptability, extremely high low carbon, low nitrogen, low emissions, comprehensive material utilization, and good environmental friendliness of circular economy.
[0022] In some embodiments of this application, such as Figures 1 to 6 As shown, an industrial waste crusher 391 is installed on the top of the industrial waste silo 40. The industrial waste crusher 391 is used to crush industrial waste to make the industrial waste reach the qualified particle size. The industrial waste conveyor 39 is located at the discharge port of the industrial waste crusher 391. The industrial waste hopper 40 has two parallel gas soft bags 403 fixed inside. Each gas soft bag 403 is covered with fiberglass cloth. The fiberglass cloth is strong and not easily damaged. It can also expand and contract with the expansion and contraction of the gas soft bag 403. Each gas soft bag 403 has a crushing plate 4031 fixed at its empty end. An air pump is fixed to the outside of the industrial waste silo 40. The air pump's outlet is connected to an air inlet pipe 401. Two ventilation pipes 402 are connected to the air inlet pipe 401. The empty end of one ventilation pipe 402 extends into a gas soft bag 403.
[0023] It is worth noting that, in order to further improve the crushing strength and avoid the occurrence of industrial waste with excessively large particle size, after the industrial waste is crushed by the industrial waste crusher 391 and enters the industrial waste bin 40, the air pump is used to repeatedly fill and pump air into the air pipe 402, thereby repeatedly filling and pumping air into the gas soft bag 403. This causes the gas soft bag 403 to repeatedly expand and contract, and drives the crushing plate 4031 to repeatedly strike the industrial waste that is continuously falling into the industrial waste bin 40.
[0024] Specifically, such as Figures 2 to 6 As shown, two parallel gas soft bags 404 are fixed inside the industrial waste hopper 40, and the gas soft bags 404 are located directly below the gas soft bags 403. Each gas soft bag 404 is covered with fiberglass cloth. Each of the gas soft capsules 404 has a broken plate 4041 fixed to its empty end. Two ventilation pipes 406 are fixed on the air inlet pipe 401. The empty end of one ventilation pipe 406 is connected to one gas soft capsule 404.
[0025] It is easy to understand that the crushing efficiency can be further increased by setting the crushing plate 4041.
[0026] Specifically, such as Figures 2 to 6 As shown, an air supply pipe 407 is fixed on the side of the industrial waste silo 40. Two air vents 406 are connected to the air outlet of the air supply pipe 407. The air inlet of the air supply pipe 407 is connected to a filling and emptying pump. The filling and emptying pump is fixed on the industrial waste silo 40. The gas soft capsule 403 and the gas soft capsule 404 expand and contract alternately, that is, the crushing plate 4031 and the crushing plate 4041 break continuously to avoid omission.
[0027] In the above embodiment, the industrial waste crusher 391 initially crushes the industrial waste. The crushed industrial waste enters the industrial waste silo 40. The air pump charges and releases air into the air inlet pipe 401, allowing the gas to enter the ventilation pipe 402. Air is then introduced into the gas soft bag 403 through the ventilation pipe 402, causing the gas soft bag 403 to repeatedly expand and contract, driving the crushing plate 4031 to repeatedly collide, further crushing the industrial waste in the industrial waste silo 40. Similarly, when the air pump repeatedly charges and releases air into the air supply pipe 407, the gas soft bag 404 can drive the crushing plate 4041 to repeatedly crush the industrial waste, so that the particle size of the industrial waste reaches the qualified particle size, thereby improving the working efficiency of the equipment.
[0028] Specifically, such as Figure 1 As shown, the flue gas recirculation system includes a slag condensation pipe 2, a primary cyclone separator 4, a secondary separator 7, a hot flue gas thermal power equipment 10, a multi-tube dust collector A11, a bag filter A12, an induced draft fan A13, and a chimney A14. The slag-condensing pipe 2 is fixed to one side of the top of the hot blast stove furnace 1. The slag-condensing pipe 2 is used to condense the alkali metals in the biomass fuel in the flue gas into gaseous substances at high temperature. The hot blast stove furnace 1 and the first-stage cyclone separator 4 are connected by the first-stage horizontal flue 3. The first-stage cyclone separator 4 and the second-stage separator 7 are connected by the second-stage horizontal flue 6. The inside of the slag-condensing pipe 2 is filled with demineralized water. After being heated by the flue gas, it is sent to the inlet of the air heater 25 through a pipeline. After the air is heated in the air heater 25, the hot air is transported to the inlet of the slag-condensing pipe 2 through the pipeline connected to the slag-condensing pipe circulation pump 32 for continued circulation and heating. The bottom of the primary cyclone separator 4 is connected to the feeding area inside the hot blast furnace 1 through the primary return feeder 5, and the bottom of the secondary separator 7 is connected to the feeding area inside the hot blast furnace 1 through the secondary return feeder 8. The top of the secondary separator 7 is provided with a hot flue gas outlet pipe 9, which is connected to the hot flue gas thermal power equipment 10 through a flue. The hot flue gas outlet pipe 9 is used to provide high-temperature hot flue gas to the hot flue gas thermal power equipment 10. A temperature regulating damper 45 is installed on the flue. The opening and closing degree of the temperature regulating damper 45 is controlled by the control system to adjust the amount of air drawn into the flue, thereby adjusting the temperature of the flue gas in real time and accurately. The hot flue gas thermal power equipment 10 is connected to the multi-tube dust collector A11 through a pipe, the multi-tube dust collector A11 is connected to the bag dust collector A12 through a pipe, the bag dust collector A12 is connected to the induced draft fan A13 through a pipe, and the exhaust end of the induced draft fan A13 is connected to the inside of the chimney A14. The duct connecting the bag filter A12 and the induced draft fan A13 is provided with a flue gas recirculation duct outlet and a regulating damper in the middle. The bag filter A12 and the induced draft fan A13 are connected to the inlet of the recirculation fan A31 through a recirculation duct. Two branch pipes are connected to the recirculation duct. One branch pipe is connected to the temperature regulating nozzle 33 at the top of the hot blast furnace 1, and the other branch pipe is connected to the air distribution chamber at the bottom of the hot blast furnace 1.
[0029] It should be noted that on the condensation heating surface at around 500℃-600℃, the material viscosity is relatively high and it is very easy to stick to the flue and heating surface, blocking the flue gas passage. The slag condensation pipe 2 can capture it, preventing it from sticking and blocking the flue gas passage in the downstream equipment, reducing equipment failure. Temperature regulating nozzles 33 are set in the combustion zone of the hot blast stove furnace 1 to inject the low-temperature recirculated flue gas into the high-temperature flue gas in the hot blast stove furnace 1. Working together with the slag condensation pipe 2, it controls and regulates the flue gas temperature in the hot blast stove furnace 1, protecting the furnace wall and furnace top from overheating. At the same time, the flue gas temperature at the outlet of the hot blast stove furnace 1 does not exceed 600℃, protecting the safety of the downstream pure air thermal equipment 17 and the metal materials of the heat exchanger.
[0030] In some embodiments of this application, considering that the temperature of industrial waste is low before entering the furnace wall, it will reduce a small portion of the heat inside the furnace wall after entering. This results in a large cumulative heat consumption during multiple additions, thus affecting the equipment's performance. Therefore, further improvements are made to address the above problems, such as... Figure 1 As shown, a ventilation pipe 46 is connected to the branch pipe near the temperature regulating nozzle 33. An opening and closing valve is fixed on the ventilation pipe 46. The opening and closing valve is used to control the inlet and outlet of the gas in the ventilation pipe 46. There are two outlet pipes on the empty end of the ventilation pipe 46. One outlet pipe is connected to the inside of the industrial waste screw feeder 41, and the other outlet pipe is connected to the inside of the biomass screw feeder 38.
[0031] In the above embodiment, when the hot gas is circulated, the on / off valve is opened, and the gas in the branch pipe can be sent into the industrial waste screw feeder 41 and the biomass screw feeder 38 through the two gas outlet pipes respectively, thereby increasing the material flow speed and improving the working efficiency of the equipment.
[0032] Specifically, such as Figure 1 As shown, a pure gas heat exchanger 16 is installed at the bottom of the hot flue gas outlet pipe 9. The pure gas heat exchanger 16 is used to provide high-temperature hot air to the pure air heating device 17 that requires pure hot air. The pure air heating device 17 is fixed on one side of the hot flue gas outlet pipe 9. The bottom of the hot flue gas outlet pipe 9 is equipped with a secondary air preheater 20 and a primary air fan preheater 23, and the secondary air preheater 20 and the primary air fan preheater 23 are located below the pure gas heat exchanger 16. The secondary air preheater 20 and the primary air fan preheater 23 preheat the hot air that supports the combustion of the hot air furnace, thereby increasing the air temperature, improving the combustion efficiency and the overall system thermal efficiency. The secondary air preheater 20 is connected to the secondary air duct 19 through a pipe. The jet outlet of the secondary air duct 19 is located inside the furnace 1 of the hot blast stove. The primary air preheater 23 is connected to the air distribution chamber at the bottom of the furnace 1 of the hot blast stove through the primary air duct 22. The outlet of the secondary air preheater 20 is connected to a secondary air fan 21, and the outlet of the primary air preheater 23 is connected to a primary air fan 24. A heater 25 is connected between the primary air fan 24 and the secondary air fan 21. A silencer is provided at the air inlet. The heater 25 is a heat exchanger that uses hot water or steam generated by the slag cooler 35 and the slag condensing pipe 2 to heat the inlet air of the secondary air preheater 20 and the primary air preheater 23. The heater 25 raises the temperature of the air entering the secondary air preheater 20 and the primary air preheater 23, and raises the wall temperature of the secondary air preheater 20 and the primary air preheater 23, thereby preventing low-temperature corrosion. The effect is particularly obvious in cold seasons. At the same time, it can recover other heat to improve the overall thermal efficiency of the hot blast stove. The bottom of the hot flue gas outlet pipe 9 is connected to a multi-tube dust collector B26 via a flue. The multi-tube dust collector B26 is connected to a bag filter B27 via a pipe. The bag filter B27 is connected to the inlet of the induced draft fan B28 via a flue. The outlet of the induced draft fan B28 is connected to the chimney B29 via a flue. The flue gas that meets the national emission standards after combustion is discharged into the atmosphere. The bag filter B27 and the induced draft fan B28 are provided with a flue gas recirculation pipe outlet and a regulating damper in the middle of the connecting pipe. A flue gas inlet pipe is connected to the pipe between the induced draft fan B28 and the chimney B29. The flue gas inlet pipe is connected to the inlet of the flue gas recirculation fan B30. The flue gas recirculation fan B30 is connected to another branch pipe through a pipe. In other words, the flue gas is sent into the temperature regulating nozzle 33 through the flue gas recirculation fan B30.
[0033] Specifically, such as Figure 1As shown, a slag cooler 35 is installed below the hot blast stove furnace chamber 1. The slag cooler 35 is used to cool the waste slag discharged from the hot blast stove furnace chamber 1 and send it to the inlet of the air heater 25 through a pipeline. After the air is heated and exchanged in the air heater 25, it is transported to the inlet of the slag cooler 35 by the slag cooler circulation pump 34 for continued circulation and heating. At the same time, it selectively returns fine particles to maintain the balance of materials in the hot blast stove furnace chamber 1, maintain good fluidization of the bed material, and improve combustion and desulfurization efficiency.
[0034] Specifically, such as Figure 1 As shown, a natural gas burner 42 is fixed on the side of the hot blast furnace 1 near the industrial waste gas burner 43. The natural gas burner 42 is a low-NOx burner, which provides auxiliary combustion for the hot blast furnace 1, ensuring flexible, safe and reliable operation and adjustment. The natural gas burner 42 can operate independently or as an auxiliary. When the hot blast furnace 1 is under extremely low load, it can play a role in stabilizing combustion. When other feeding systems fail, it can ensure the normal operation of the hot blast furnace. When the load needs to be increased rapidly, it can quickly respond to the load requirements. It can also be shut down during normal operation to save operating costs.
[0035] Specifically, such as Figure 1 As shown, an SNCR denitrification device 44 is installed on the side of the hot blast furnace chamber 1. The SNCR denitrification device 44 is a flue gas denitrification device. The diluted urea solution is atomized by compressed air and sprayed into the flue gas at 750℃-900℃ in the hot blast furnace chamber 1 to react with the nitrogen oxides in the flue gas and remove them.
[0036] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, various modifications and variations are possible with this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels, comprising a hot blast stove furnace (1) and a flue gas recirculation system, characterized in that, It also includes biomass silos (37) and industrial waste silos (40); The top of the biomass silo (37) is equipped with a biomass silo conveyor (36), which is a belt conveyor; The bottom of the biomass silo (37) is connected to a biomass screw feeder (38) via a pipe. The biomass screw feeder (38) consists of two layers of multiple shaftless screw feeders, with the axes of the upper and lower shaftless screw feeders arranged in a cross shape. The bottom of the biomass screw feeder (38) is connected to a feed pipe, and the empty end of the feed pipe extends into the furnace chamber (1) of the hot air furnace. The industrial waste silo (40) is equipped with an industrial waste conveyor (39) at the top and an industrial waste screw feeder (41) at the bottom of the industrial waste silo (40) via a feeding pipe (405). The bottom of the industrial waste screw feeder (41) is connected to a conveying pipe (411), and the empty end of the conveying pipe (411) extends into the furnace chamber (1) of the hot air furnace. An industrial waste gas burner (43) is fixed on the side of the hot air furnace chamber (1). The industrial waste gas burner (43) is a low-NOx burner, and one end of the industrial waste gas burner (43) extends into the hot air furnace chamber (1).
2. The biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels as described in claim 1, characterized in that, An industrial waste crusher (391) is installed on the top of the industrial waste silo (40). The industrial waste crusher (391) is used to crush industrial waste. The industrial waste conveyor (39) is located at the discharge port of the industrial waste crusher (391). The industrial waste silo (40) has two parallel gas soft bags (403) fixed inside. Each gas soft bag (403) is covered with glass fiber cloth, and each gas soft bag (403) has a crushing plate (4031) fixed at its empty end. An air pump is fixed on the outside of the industrial waste silo (40). The air pump is connected to an air inlet pipe (401) at the air outlet. Two ventilation pipes (402) are connected to the air inlet pipe (401). The empty end of one ventilation pipe (402) extends into a gas soft bag (403).
3. The biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels as described in claim 1, characterized in that, The industrial waste silo (40) has two parallel gas soft bags (404) fixed inside, and the gas soft bags (404) are located directly below the gas soft bags (403). Each gas soft bag (404) is covered with glass fiber cloth. Each of the gas soft capsules (404) has a broken plate (4041) fixed to its empty end. Two ventilation pipes (406) are fixed on the air inlet pipe (401). The empty end of one ventilation pipe (406) is in one gas soft capsule (404).
4. The biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels as described in claim 2, characterized in that, The industrial waste silo (40) is fixed with an air supply pipe (407) on its side. Two air vents (406) are connected to the air outlet of the air supply pipe (407), and the air inlet of the air supply pipe (407) is connected to the air pump. The gas soft capsule one (403) and the gas soft capsule two (404) expand and contract alternately.
5. The biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels as described in claim 1, characterized in that, The flue gas recirculation system includes a slag condenser (2), a primary cyclone separator (4), a secondary separator (7), a hot flue gas thermal power equipment (10), a multi-tube dust collector A (11), a bag filter A (12), an induced draft fan A (13), and a chimney A (14). The slag-forming pipe (2) is fixed on one side of the top of the hot blast stove furnace (1). The hot blast stove furnace (1) and the primary cyclone separator (4) are connected by a primary horizontal flue (3). The primary cyclone separator (4) and the secondary separator (7) are connected by a secondary horizontal flue (6). The bottom of the primary cyclone separator (4) is connected to the feeding area inside the furnace chamber (1) of the hot blast stove through the primary return feeder (5), and the bottom of the secondary separator (7) is connected to the feeding area inside the furnace chamber (1) of the hot blast stove through the secondary return feeder (8). The secondary separator (7) is provided with a hot flue gas outlet pipe (9) at the top. The hot flue gas outlet pipe (9) is connected to the hot flue gas thermal power equipment (10) through a flue. A temperature regulating damper (45) is installed on the flue. The hot flue gas thermal power equipment (10) is connected to the multi-tube dust collector A (11) through a pipe. The multi-tube dust collector A (11) is connected to the bag dust collector A (12) through a pipe. The bag dust collector A (12) is connected to the induced draft fan A (13) through a pipe. The exhaust end of the induced draft fan A (13) is connected to the inside of the chimney A (14). The bag filter A (12) and the induced draft fan A (13) are connected by a flue gas recirculation pipe outlet and a regulating damper in the middle of the pipe. The bag filter A (12) and the induced draft fan A (13) are connected to the inlet of the recirculation fan A (31) through a recirculation pipe. There are two branch pipes connected to the recirculation pipe. One branch pipe is connected to the temperature regulating nozzle (33) at the top of the hot blast furnace (1), and the other branch pipe is connected to the air distribution chamber at the bottom of the hot blast furnace (1).
6. The biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels as described in claim 5, characterized in that, A ventilation pipe (46) is connected to the branch pipe near the temperature regulating nozzle (33). An opening and closing valve is fixed on the ventilation pipe (46). There are two air outlet pipes on the empty end of the ventilation pipe (46). One air outlet pipe is connected to the inside of the industrial waste screw feeder (41), and the other air outlet pipe is connected to the inside of the biomass screw feeder (38).
7. The biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels as described in claim 5, characterized in that, A pure air heat exchanger (16) is installed at the bottom of the hot flue gas outlet pipe (9). The pure air heat exchanger (16) is used to provide high-temperature hot air to the pure air heat equipment (17) that requires pure hot air. The pure air heat equipment (17) is fixed on one side of the hot flue gas outlet pipe (9). The bottom of the hot flue gas outlet pipe (9) is equipped with a secondary air preheater (20) and a primary air fan preheater (23), and the secondary air preheater (20) and the primary air fan preheater (23) are located below the pure gas heat exchanger (16). The secondary air preheater (20) is connected to the secondary air duct (19) through a pipe. The jet outlet of the secondary air duct (19) is located inside the furnace (1) of the hot blast stove. The primary air preheater (23) is connected to the bottom air distribution chamber of the furnace (1) of the hot blast stove through the primary air duct (22). The outlet of the secondary air preheater (20) is connected to a secondary air fan (21), the outlet of the primary air preheater (23) is connected to a primary air fan (24), and a heater (25) is connected between the primary air fan (24) and the secondary air fan (21). The bottom of the hot flue gas outlet pipe (9) is connected to a multi-tube dust collector B (26) through a flue. The multi-tube dust collector B (26) is connected to a bag filter B (27) through a pipe. The bag filter B (27) is connected to the inlet of the induced draft fan B (28) through a flue. The outlet of the induced draft fan B (28) is connected to the chimney B (29) through a flue. A flue gas inlet pipe is connected between the induced draft fan B (28) and the chimney B (29). The flue gas inlet pipe is connected to the inlet of the flue gas recirculation fan B (30). The flue gas recirculation fan B (30) is connected to another branch pipe through a pipeline.
8. The biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels as described in claim 1, characterized in that, A slag cooler (35) is installed below the furnace chamber (1) of the hot blast stove. The slag cooler (35) is used to cool the waste slag discharged from the furnace chamber (1) of the hot blast stove and send it to the inlet of the heater (25) through a pipeline.
9. The biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels as described in claim 1, characterized in that, A natural gas burner (42) is fixed on the side of the hot blast furnace (1) near the industrial waste gas burner (43). The natural gas burner (42) is a low-NOx burner that provides auxiliary combustion for the hot blast furnace (1).
10. The biomass circulating fluidized bed hot blast stove capable of co-firing multiple fuels as described in claim 1, characterized in that, The hot blast furnace (1) is equipped with an SNCR denitrification device (44) on the side. The SNCR denitrification device (44) is a flue gas denitrification device. The diluted urea solution is atomized by compressed air and sprayed into the flue gas at 750℃-900℃ in the hot blast furnace (1) to react with the nitrogen oxides in the flue gas and remove them.