Integrated apparatus for coal-fired kiln raw material fuel alternative dechlorination, denitrification and coordinated solid waste processing

Abstract

The present invention belongs to the technical field of efficient utilization of clean, low-carbon energy using solid waste to prepare renewable energy, and specifically relates to an integrated apparatus for coal-fired kiln raw material fuel alternative dechlorination, denitrification, and coordinated solid waste treatment, comprising: a continuous rotary arch-breaking boiling gasification furnace apparatus, a secondary combustion and gas-solid separation apparatus, a circulating cooling apparatus and a control system. During a shutdown period of a cement kiln, a solid waste alternative fuel is in an aerobic full combustion working state, and a residue produced after combustion can be used as a mixed material for cement production or a raw material for cement clinker production. When a solid waste alternative fuel is burned in an oxygen-free or oxygen-poor reduction process, a high-temperature combustible gas having reducing properties is generated. The high-temperature combustible gas enters a cement kiln decomposition furnace and a pre-decomposition system, decreasing the generation of nitrogen oxides in the cement kiln decomposition furnace and pre-decomposition system. At the same time, the reducing atmosphere can be burned in the cement kiln system to generate heat, which can reduce the amount of coal used.

Description

Multifunctional equipment for coal-fired kiln raw material fuel replacement, dechlorination, denitrification and coordinated solid waste disposal Technical Field

[0001] The present invention belongs to the technical field of efficient utilization of clean, low-carbon energy by using solid waste to prepare renewable energy, and specifically relates to a multifunctional equipment for replacing raw material fuel for coal-fired kilns, removing chlorine and denitrification, and coordinating solid waste disposal. Background Art

[0002] Currently, there are several options for solid waste treatment:

[0003] (1) Direct combustion in the kiln: The process is relatively simple and the investment is low, but the complex and variable composition of solid waste, especially the water content and chloride ion problems, directly affects the output and quality stability of the cement kiln;

[0004] (2) Organic solid waste is formed and then put into kiln for combustion: Although it can utilize a certain amount of heat energy, it is relatively low. At the same time, it has high requirements for the chloride ion index of materials, and there is a phenomenon of being picky about materials;

[0005] (3) Organic solid waste is pre-combusted in an external furnace, and the high-temperature flue gas is then sent to the decomposition furnace for combustion: Although the stability of the cement kiln has been improved, the excess coefficient of pre-combustion air is too large, resulting in excessive flue gas volume and low temperature, and the utilization efficiency of solid waste is reduced. Due to problems such as insufficient pre-combustion of materials or over-temperature coking, it is easy to cause material accumulation and blockage in the kiln. At the same time, a large amount of chloride ions in the solid waste are brought into the cement kiln, which has a great impact on the normal production of cement.

[0006] In summary, the current solid waste treatment solutions cannot meet the industry development needs of energy conservation and environmental protection. Technical issues

[0007] The technical problem to be solved by the present invention is to address the deficiencies in the existing technology and provide a multifunctional equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification, and coordinated solid waste disposal. The present invention can reduce nitrogen oxide emissions, save coal consumption while disposing of solid waste, thereby reducing coal consumption costs and denitrification costs, and at the same time can achieve process dechlorination, thereby reducing the introduction of chloride ions from combustible gases in the cement kiln decomposition furnace, which not only increases the utilization of solid alternative raw material fuels, but also reduces the impact of chloride ions on clinker quality. Technical Solutions

[0008] This solution is achieved through the following technical measures: equipment that is used to replace raw materials and fuels of coal-fired kilns, remove chlorine and denitrify, and coordinate solid waste disposal, including

[0009] The continuous rotary arch-breaking boiling gasification furnace, as a solid waste calciner, is used to achieve boiling calcination or stacking calcination of solid waste materials. It is equipped with an arch-breaking device to prevent the solid waste materials from coking. During the cement kiln shutdown period, the device is used to achieve boiling calcination of solid waste materials, forming an oxygen combustion atmosphere within the furnace. During the normal operation of the cement kiln, the device achieves stacking calcination of solid waste materials, forming a reducing atmosphere within the furnace, achieving the denitrification function of the cement kiln system. At the same time, the reducing atmosphere can be burned in the cement kiln system to generate heat, which can reduce the amount of coal burned.

[0010] The secondary combustion and gas-solid separation device is used for the secondary combustion and gas-solid separation of the combustible gas discharged from the continuous rotary arch-breaking boiling gasification furnace device, wherein the air inlet end is connected to the air outlet of the continuous rotary arch-breaking boiling gasification furnace device, and the air outlet is connected to the circulating cooling device and the cement kiln decomposition furnace;

[0011] The circulating cooling device is located at the bottom of the continuous rotary arch-breaking boiling gasification furnace. It is used to discharge the residue from the continuous rotary arch-breaking boiling gasification furnace, as well as the chloride-containing flue gas discharged from the secondary combustion and gas-solid separation device and the cement kiln, and to introduce the chloride-containing flue gas into the cement kiln for calcination. The chloride ions in the chloride-containing flue gas are condensed and discharged with the residue, achieving chlorine removal from the chloride-containing flue gas. It is applied in cement clinker production scenarios and can replace the existing cement kiln bypass venting dechlorination technology.

[0012] The control system is used to control the continuous rotary arch-breaking boiling gasification furnace device, the secondary combustion and gas-solid separation device, the circulating cooling device and the cement kiln to work in coordination, so that the continuous rotary arch-breaking boiling gasification furnace device can be switched between the two combustion atmosphere states of boiling calcination and stacking calcination.

[0013] Preferably, a denitration catalyst addition port is provided on the secondary combustion and gas-solid separation device. The denitration catalyst is ash containing ammonia-alkali components. Ammonia is generated in the secondary combustion and gas-solid separation device to denitrate the hot gas.

[0014] Preferably, the air outlet end of the secondary combustion and gas-solid separation device is connected to a three-way high-temperature reduction combustible gas outlet pipe, one outlet of the high-temperature reduction combustible gas outlet pipe is connected to the circulating cooling device through a circulating air duct equipped with a control valve, and the other air outlet is connected to the cement kiln system through a pipeline, and the middle section of the circulating air duct is connected to the cement kiln system through a hot air inlet pipe, and high-temperature gas or high-temperature gas containing chloride ions can be introduced from the cement kiln system; a real-time online chloride ion detector is installed in the high-temperature reduction combustible gas outlet pipe, and the real-time online chloride ion detector is connected to the control system. The real-time online chloride ion detector monitors the chloride ion concentration in the chloride ion-containing flue gas discharged from the air outlet in real time, and feeds back the monitoring results to the control system in real time.

[0015] Preferably, the arch-breaking device includes a fluidizing plate arranged in the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device, the fluidizing plate is a cone structure or a spherical arch structure, the fluidizing plate is driven to rotate by a power device through a hollow shaft tube, a plurality of vents are provided on the fluidizing plate, the cavity below the fluidizing plate in the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device is connected to the fluidizing fan through the hollow shaft tube and the air pipe, a plurality of arch-breaking protrusions are provided on the upper surface of the fluidizing plate, and a gap is left between the periphery of the fluidizing plate and the inner wall of the continuous rotary arch-breaking boiling gasification furnace device as a material discharge channel;

[0016] The fluidizing fan provides fluidizing gas with uniform pressure and flow distribution through the rotating fluidizing plate, so that the material entering the continuous rotary arch-breaking boiling gasification furnace device is in a suspended state in the boiling zone. When the fluidizing plate rotates, the arch-breaking protrusions are used to break up the residue to prevent the residue from coking. The fluidizing plate can also guide the residue so that the residue can be gathered along the fluidizing plate to the lower material channel and discharged into the cooling air box through the lower material channel.

[0017] Preferably, the circulating cooling device includes a cooling air box connected to the bottom of the continuous rotary arch-breaking boiling gasification furnace device, a water-cooling coil is installed inside the cooling air box, a cooling fan is connected to the bottom of the cooling air box, the outlet end of the circulating air duct is connected to the cooling air box through a high-temperature circulating fan, the cooling air box is connected to the inlet end of the waist air duct of the continuous rotary arch-breaking boiling gasification furnace device, the outlet end of the waist air duct is connected to the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device or is connected to the outlet of the high-temperature reduced combustible gas outlet duct connected to the cement kiln system.

[0018] Preferably, the cooling air box is also connected to a material sealing pipe, the outlet end of the material sealing pipe is a slag discharge port, and an inclined material guide and air distribution plate is also installed in the cooling air box. The inclined material guide and air distribution plate is located below the water-cooling coil, and ventilation holes are provided on the inclined material guide and air distribution plate. The lowest end of the inclined material guide and air distribution plate is flush with the lower edge of the inner wall of the inlet end of the material sealing pipe.

[0019] Preferably, the area at the bottom of the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device, located above the fluidizing plate, is the boiling zone. The inner cavity of the continuous rotary arch-breaking boiling gasification furnace device is divided into three parts from bottom to top: a low-temperature zone, a high-temperature zone and a constant temperature zone. The low-temperature zone, the high-temperature zone and the constant temperature zone are all provided with real-time temperature and pressure monitors, and the temperature and pressure monitors are connected to the control system; the temperature of the low-temperature zone is 600-700°C, the temperature of the high-temperature zone is 1000-1100°C, and the temperature of the constant temperature zone is 900-950°C.

[0020] Preferably, a feed port is provided at the upper end of the continuous rotary arch-breaking boiling gasification furnace device, a distributor is installed in the feed port, a material bed distributor and a fluid nozzle are connected to the middle section of the continuous rotary arch-breaking boiling gasification furnace device, and a chlorine removal catalyst addition port is provided in the circulating air duct near its outlet end.

[0021] Preferably, the output temperature of the secondary combustion and gas-solid separation device is 800°C-900°C.

[0022] Preferably, the slag outlet of the secondary combustion and gas-solid separation device is connected to the continuous rotary arch-breaking boiling gasification furnace device or to the discharge chute through a screw feeder.

[0023] Preferably, when the cement kiln is shut down, 5%-10% by mass of limestone is added to the solid waste, and the limestone and solid waste are calcined together in a continuous rotary arch-breaking boiling gasification furnace device under aerobic conditions to neutralize the acidic gas and generate neutral high-temperature gas. The generated neutral high-temperature gas enters the cement kiln waste heat boiler for power generation, which is suitable for reusing idle waste heat power generation equipment when the cement kiln and metallurgical furnace are shut down; the generated neutral high-temperature gas can also be used alone to prepare high-temperature steam.

[0024] Preferably, while solid waste is added into the continuous rotary arch-breaking boiling gasification furnace device through the feed port, a dechlorination catalyst is added through the dechlorination catalyst addition port. The dechlorination catalyst is a rare earth-based catalyst containing nickel, palladium and rhodium components. By mass percentage, the contents of nickel, palladium and rhodium components are 1.5%, 0.3% and 0.1% respectively, and the rare earth content is 5%. The amount of dechlorination catalyst added is 0.1% of the amount of solid waste added.

[0025] Preferably, the continuous rotary arch-breaking boiling gasification furnace device can be independently used for the calcination of inorganic non-metallic minerals, including bauxite, graphite ore, coal gangue, lignite, potassium feldspar, aluminum slag, red mud, gold cyanide tailings, saw mud and contaminated soil, and fly ash. Beneficial effects

[0026] The present invention uses a continuous rotary arch-breaking boiling gasifier device to perform a graded gasification reaction under an oxygen-free or oxygen-deficient state. The high-temperature combustible gas generated by the gasification reaction is introduced into the cement kiln decomposition furnace as a reducing agent. By reducing the generation of nitrogen oxides in the cement kiln decomposition furnace and the pre-decomposition system, nitrogen oxide emissions are reduced, and the denitrification function of the cement kiln system is realized. At the same time, the reducing atmosphere can be burned in the cement kiln system to generate heat, which can reduce the amount of coal burned, and can achieve the multiple effects of reducing nitrogen oxide emissions, saving coal consumption and disposing of solid waste, thereby reducing coal consumption costs and denitrification costs. At the same time, the reducing combustible gas generated is condensed and dechlorinated after passing through a circulating cooling device, reducing the introduction of chloride ions from the combustible gas in the cement kiln decomposition furnace, not only increasing the utilization of solid alternative raw material fuels, but also reducing the influence of chloride ions on the quality of clinker.

[0027] Solid waste alternative fuels can also be fully burned in the continuous rotary arch-breaking boiling gasifier unit with oxygen even when the cement kiln is shut down, producing neutral, high-temperature gas. This neutral, high-temperature gas is then fed into the cement kiln's waste heat boiler for power generation. This allows for the resource utilization and disposal of solid waste while the kiln is shut down, enabling year-round operation and significantly increasing disposal capacity. The secondary combustion and gas-solid separation unit, used as a denitrification unit, has been proven to reduce ammonia consumption by 15% compared to existing processes, increase solid waste calorific value utilization by over 85%, significantly reduce denitrification costs and save coal, and increase disposal capacity by over 2.0 times.

[0028] It can be seen that compared with the prior art, the present invention has outstanding substantial features and significant progress, and the beneficial effects of its implementation are also obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] FIG1 is a schematic structural diagram of a specific embodiment of the present invention.

[0030] FIG2 is an enlarged view of point A in FIG1 .

[0031] In the figure, 1-feeding port, 2-distributor, 3-observation port, 4-continuous rotary arch-breaking boiling gasification furnace device, 5-gasification zone, 6-high-temperature pyrolysis zone, 7-fluid nozzle, 8-waist air duct, 9-boiling zone, 10-arch-breaking device, 11-bypass, 12-material sealing pipe, 13-slag discharge port, 14-cooling fan, 15-power device, 16-fluidizing fan, 17-circulating cooling device, 18-high-temperature circulating fan, 19-chlorine removal catalyst injection port, 20-point Fire mouth, 21-screw feeder, 22-hot air inlet pipe, 23-material bed distributor, 24-circulating air duct, 25-secondary combustion and gas-solid separation device, 26-denitrification catalyst feeding port, 27-real-time online chloride ion detector, 28-high-temperature reduction combustible gas outlet pipe, 29-cooling air box, 30-inclined material guide air distribution plate, 31-hollow shaft tube, 32-water cooling coil, 33-fluidizing plate, 34-vent, 35-arch-breaking protrusion, 36-discharging channel. Best Mode for Carrying Out the Invention

[0032] In order to clearly illustrate the technical features of this solution, the solution is described below through specific implementation methods and in conjunction with the accompanying drawings.

[0033] The multifunctional equipment used for replacing raw material fuel for coal-fired kilns with chlorine and denitrification and coordinating solid waste disposal includes a continuous rotary arch-breaking boiling gasification furnace device 4, a secondary combustion and gas-solid separation device 25, a circulating cooling device 17 and a control system.

[0034] The continuous rotary arch-breaking boiling gasification furnace device 4 is used as a solid waste calcining furnace to achieve boiling calcination or stacking calcination of solid waste materials. It is equipped with an arch-breaking device 10 to prevent the solid waste materials from coking. During the cement kiln shutdown period, the device is used to achieve boiling calcination of solid waste materials, forming an oxygen combustion atmosphere in the furnace body. The residue produced after combustion can be used as an admixture for cement production or a raw material for cement clinker production. During the normal operation of the cement kiln, the device achieves stacking calcination of solid waste materials. The reaction form of the stacking calcination reaction is as follows:

[0035] C+O2→CO2

[0036] C+O2→CO

[0037] C + H2O → CO + H 2

[0038] CO+H2O→CO2+H2

[0039] C n H m O p →C+H2+CO+CH4+C2H4+C2H6+C n H n

[0040] After stacking and calcining, a reducing atmosphere is formed in the furnace body of the continuous rotary arch-breaking boiling gasification furnace device 4, generating high-temperature combustible gases CO, CH4, and / or H2 with reducing properties, providing reducing gas for the cement kiln. The high-temperature combustible gases CO, CH4, and / or H2 enter the cement kiln decomposition furnace and pre-decomposition system, reducing the generation of nitrogen oxides in the cement kiln decomposition furnace and pre-decomposition system, reducing nitrogen oxide emissions and achieving the denitrification function of the cement kiln system. At the same time, the reducing atmosphere can be burned in the cement kiln system to generate heat, which can reduce the amount of coal burned, achieving the multiple effects of reducing nitrogen oxide emissions, saving coal consumption, and disposing of solid waste. It is applicable to cement kilns, metallurgy, and coal-fired power generation scenarios. The continuous rotary arch-breaking boiling gasification furnace device 4 can be independently used to calcine inorganic non-metallic minerals, such as bauxite, graphite ore, coal gangue, lignite, potassium feldspar, aluminum slag, red mud, gold cyanide tailings, saw mud, contaminated soil, and fly ash.

[0041] A feed port 1 is provided at the upper end of the continuous rotary arch-breaking boiling gasification furnace device 4, a distributor 2 is installed in the feed port 1, a bed distributor 23 and a fluid nozzle 7 are connected to the middle section of the continuous rotary arch-breaking boiling gasification furnace device 4, and a dechlorination catalyst injection port 19 is provided in the circulating air duct 24 near its outlet end. Before feeding, base material is added to the continuous rotary arch-breaking boiling gasification furnace device 4 through the bed distributor 23 to preheat the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device 4. Continuous feeding of solid waste and slurry-like solid waste can be achieved through the feed port 1 and the distributor 2, and continuous feeding of fluid solid waste such as waste oil can be achieved through the fluid nozzle 7. While feeding, a dechlorination catalyst can be added through the dechlorination catalyst injection port 19 to achieve a better dechlorination effect.

[0042] The arch-breaking device 10 includes a fluidizing plate 33 disposed within the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device 4. The fluidizing plate 33 has a conical or spherical arch structure and is driven to rotate by a power unit 15 through a hollow shaft tube 31. The power unit 15 utilizes existing technology, such as a motor and a gear transmission mechanism. The motor drives the hollow shaft tube 31 and the fluidizing plate 33 to rotate through the gear transmission mechanism. The fluidizing plate 33 is provided with a plurality of vents 34. The cavity below the fluidizing plate 33 within the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device 4 is connected to the fluidizing fan 16 via the hollow shaft tube 31 and an air pipe. The upper surface of the fluidizing plate 33 is provided with a plurality of arch-breaking protrusions 35. A gap is left between the periphery of the fluidizing plate 33 and the inner wall of the continuous rotary arch-breaking boiling gasification furnace device 4 as a material discharge channel 36. The fluidizing fan 16 provides fluidizing gas with uniform pressure and flow distribution through the rotating fluidizing plate 33, so that the material entering the continuous rotary arch-breaking boiling gasification furnace device 4 is in a suspended state in the boiling zone 9. When the fluidizing plate 33 rotates, the arch-breaking protrusions 35 are used to break up the residue to prevent the residue from coking. The fluidizing plate 33 can also guide the residue so that the residue can be gathered along the fluidizing plate 33 to the lower material channel 36 and discharged into the cooling air box 29 through the lower material channel 36.

[0043] In the arch-breaking device of the above-described structure, the power unit 15 drives the fluidizing plate 33 in a continuously rotating state, thereby preventing the material entering the boiling zone 9 and the residue produced after combustion from coking. The fluidizing fan 16 continuously supplies air through the vents 34, keeping the material in a suspended state. The conical or spherical structure of the fluidizing plate 33, on the one hand, breaks up the residue in this area through the arch-breaking protrusions 35 thereon during the fluidizing plate 33's rotation, thereby preventing the residue from coking. On the other hand, the conical or spherical structure of the fluidizing plate 33 can guide the residue so that it can be collected along the fluidizing plate 33 to the lower material channel 36 and discharged into the cooling air box 29 through the lower material channel 36.

[0044] The area at the bottom of the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device 4, located above the fluidizing plate 33, is the boiling zone 9. The inner cavity of the continuous rotary arch-breaking boiling gasification furnace device 4 is divided into three parts from bottom to top: a low-temperature zone, a high-temperature zone and a constant temperature zone. The low-temperature zone, the high-temperature zone and the constant temperature zone are all provided with real-time temperature and pressure monitors, which are connected to the control system; the temperature of the low-temperature zone is 600-700°C, the temperature of the high-temperature zone is 1000-1100°C, and the temperature of the constant temperature zone is 900-950°C. This partitioned furnace body structure facilitates monitoring the furnace body temperature of the continuous rotary arch-breaking boiling gasification furnace device 4.

[0045] The secondary combustion and gas-solid separation device 25 is used for the secondary combustion and gas-solid separation of the combustible gas discharged from the continuous rotary arch-breaking boiling gasification furnace device 4. Its air inlet is connected to the air outlet of the continuous rotary arch-breaking boiling gasification furnace device 4, and its air outlet is connected to the circulating cooling device 17 and the cement kiln decomposition furnace. The output temperature of the secondary combustion and gas-solid separation device 25 is 800°C-900°C, and preferably the output temperature of the secondary combustion and gas-solid separation device 25 is 850°C. The slag outlet of the secondary combustion and gas-solid separation device 25 is connected to the continuous rotary arch-breaking boiling gasification furnace device 4 or to the discharge chute through the screw feeder 21. The residue separated in the secondary combustion and gas-solid separation device 25 is transported to the continuous rotary arch-breaking boiling gasification furnace device 4 through the screw feeder 21 for repeated combustion, resulting in sintering and burning through, or directly discharged through the discharge chute.

[0046] The secondary combustion and gas-solid separation device 25 is provided with a denitration catalyst feeding port 26. The denitration catalyst is ash containing ammonia and alkali components (such as aluminum ash generated during the electrolytic aluminum and aluminum processing production processes). Ammonia is generated in the secondary combustion and gas-solid separation device 25 to denitrate the hot gas, which helps to improve the denitration effect of the cement kiln decomposition furnace and pre-decomposition system, and further reduce the ammonia consumption in the SNCR denitration mode.

[0047] The outlet end of the secondary combustion and gas-solid separation device 25 is connected to a three-way high-temperature reduction combustible gas outlet pipe 28. One outlet of the high-temperature reduction combustible gas outlet pipe 28 is connected to the circulating cooling device 17 through a circulating air duct 24 equipped with a control valve, and the other outlet is connected to the cement kiln system through a pipeline. The circulation air duct 24 can be controlled by the control valve. The middle section of the circulating air duct 24 is connected to the cement kiln system through a hot air inlet pipe 22, and high-temperature gas or high-temperature gas containing chloride ions can be introduced from the cement kiln system; a real-time online chloride ion detector 27 is installed in the high-temperature reduction combustible gas outlet pipe 28, and the real-time online chloride ion detector 27 is connected to the control system. The real-time online chloride ion detector 27 monitors the chloride ion concentration in the chloride ion-containing flue gas discharged from the outlet in real time, and feeds back the monitoring results to the control system in real time. When the concentration of chloride ions in the cement kiln and / or the secondary combustion and gas-solid separation device 25 reaches a preset value, the control valve is opened and the circulating air duct 24 is enabled to realize the venting of the cement kiln and / or the dechlorination and circulation of the hot air (flue gas containing chloride ions) in the secondary combustion and gas-solid separation device 25. Specifically, when the chloride ion concentration in the cement kiln exceeds the standard and the cement kiln needs to vent and / or the chloride ion concentration in the gas separated by the secondary combustion and gas-solid separation device 25 exceeds the standard, the control system controls the control valve to open, so that the chloride ions in the tail smoke chamber of the cement kiln are removed. The secondary flue gas can enter the circulating air duct 24 through the hot air inlet pipe 22, and after dechlorination in the circulating cooling device 17, it is discharged into the secondary combustion and gas-solid separation device 25 through the continuous rotary arch-breaking boiling gasification furnace device 4 for secondary combustion and gas-solid separation. A part of the hot air discharged from the air outlet of the secondary combustion and gas-solid separation device 25 enters the circulating air duct 24 for circulation, and the other part of the hot air enters the cement kiln for circulation. In this way, the chloride ion concentration in the hot air in the cement kiln and the secondary combustion and gas-solid separation device 25 is maintained within a normal range.

[0048] The circulating cooling device 17 is located at the bottom of the continuous rotary arch-breaking boiling gasification furnace device 4, and is used to discharge the residue from the continuous rotary arch-breaking boiling gasification furnace device 4 and the chloride-containing flue gas discharged from the secondary combustion and gas-solid separation device 25 and the cement kiln, and to introduce the chloride-containing flue gas into the cement kiln for calcination and condensation, so that the chloride ions in the chloride-containing flue gas are condensed and discharged with the residue, thereby realizing the dechlorination of the chloride-containing flue gas. It is applied to cement clinker production scenarios and can replace the existing cement kiln bypass venting and dechlorination technology, which can reduce the introduction of chloride ions in the combustible gas in the cement kiln decomposition furnace, which not only increases the utilization of solid alternative raw material fuels, but also reduces the impact of chloride ions on the quality of clinker.

[0049] The circulating cooling device 17 includes a cooling air box 29 connected to the bottom of the continuous rotary arch breaking boiling gasification furnace device 4, and a water-cooling coil 32 is installed inside the cooling air box 29. The bottom of the cooling air box 29 is connected to the cooling fan 14. The outlet end of the circulating air duct 24 is connected to the cooling air box 29 through the high-temperature circulating fan 18. The cooling air box 29 is connected to the inlet end of the waist air duct 8 of the continuous rotary arch breaking boiling gasification furnace device 4. The outlet end of the waist air duct 8 is connected to the inner cavity of the continuous rotary arch breaking boiling gasification furnace device 4 or connected to the bypass 11 and the outlet of the high-temperature reducing combustible gas outlet pipe 28 connected to the cement kiln system. The cooling air box 29 is also connected to the material sealing pipe 12, the outlet end of which is the slag discharge port 13. An inclined material guide and air distribution plate 30 is also installed in the cooling air box 29. The inclined material guide and air distribution plate 30 is located below the water-cooling coil 32 and is provided with ventilation holes. This structure of the inclined material guide and air distribution plate 30 ensures the normal discharge of residue without affecting the air supply of the cooling fan 14 to the cooling air box 29. The cold air is blown from bottom to top, ensuring that residue does not enter the ventilation holes. The lowest end of the inclined material guide and air distribution plate 30 is flush with the lower edge of the inner wall of the inlet end of the material sealing pipe 12, which prevents the occurrence of residue residue in a dead corner at the inlet end of the material sealing pipe 12.

[0050] In the circulating cooling device 17 of the above-mentioned structural form, the cooling fan 14 provides cooling air for the cooling air box 29. In addition, the cooling effect of the water-cooling coil 32 can cool the chloride ion-containing flue gas transported from the circulating air duct 24 to the cooling air box 29, so that the chloride ion-containing flue gas is condensed after cooling, and the chloride ions in the chloride ion-containing flue gas are condensed and discharged with the residue, thereby achieving the purpose of chlorine removal.

[0051] The control system is used to control the coordinated operation of the continuous rotary arch-breaking boiling gasification furnace unit 4, the secondary combustion and gas-solid separation unit 25, the circulating cooling unit 17, and the cement kiln, enabling the continuous rotary arch-breaking boiling gasification furnace unit 4 to switch between boiling calcination and stacking calcination combustion atmospheres. During normal operation of the cement kiln, the solid waste substitute fuel operates in stacking calcination (i.e., oxygen-free or oxygen-depleted reducing combustion). During kiln shutdown, the solid waste substitute fuel operates in a fully oxygenated combustion state. The resulting residue can be used as an admixture for cement production or as a raw material for cement clinker production, thereby replacing raw materials for cement production. The oxygen-free or oxygen-depleted reducing combustion of the solid waste substitute fuel in the continuous rotary arch-breaking boiling gasification furnace unit 4 generates high-temperature, reducing combustible gases such as CO, CH4, and / or H2. These gases enter the cement kiln's precalciner and precalciner system, reducing the generation of nitrogen oxides therein, thereby reducing nitrogen oxide emissions and reducing the amount of ammonia used in the SNCR denitrification mode. At the same time, the combustion of reducing high-temperature combustible gases CO, CH4 and H2 can release a large amount of heat energy, which can supplement heat for the cement kiln decomposition furnace, reduce the amount of coal injection, achieve energy substitution, and reduce carbon dioxide emissions.

[0052] In the present invention, when the cement kiln is shut down, 5%-10% by mass of limestone is added to the solid waste, and the limestone and the solid waste are calcined together in a continuous rotary arch-breaking boiling gasification furnace device 4 under aerobic conditions to neutralize the acidic gas and generate neutral high-temperature gas. The generated neutral high-temperature gas enters the cement kiln waste heat boiler for power generation, which is suitable for reusing idle waste heat power generation equipment when the cement kiln and metallurgical furnace are shut down; the generated neutral high-temperature gas can also be used alone to prepare high-temperature steam.

[0053] In the present invention, while solid waste is fed into the continuous rotary arch-breaking boiling gasification furnace device 4 through the feed port 1, a dechlorination catalyst is added through the dechlorination catalyst addition port 19. The dechlorination catalyst is a rare earth-based catalyst containing nickel, palladium, and rhodium components. By mass percentage, the contents of nickel, palladium, and rhodium are 1.5%, 0.3%, and 0.1%, respectively, and the rare earth content is 5%. The amount of dechlorination catalyst added is 0.1% of the amount of solid waste fed.

[0054] In the present invention, the fluidizing fan 16 provides the fluidizing gas with uniform pressure and flow distribution of the material bed required for boiling combustion through the rotating fluidizing plate 33, so that the material entering the continuous rotary arch-breaking boiling gasification furnace device 4 is in a suspended state in the boiling zone 9. At the same time, the residue produced after combustion falls on the fluidizing plate 33 and then falls into the cooling air box 29 from the discharge channel 36 around the fluidizing plate 33. The residue is cooled by the cold air provided by the water-cooling coil 32 and the cooling fan 14, and is discharged through the material sealing pipe 12 and the slag discharge port 13 after air cooling and cooling by the water-cooling coil 32. In this process, the chloride ion flue gas transported to the cooling air box 29 by the circulating air duct 24 is condensed, so that the chloride ions in the chloride ion flue gas are condensed and discharged with the residue, thereby realizing flue gas dechlorination. The arch-breaking protrusion 35 can break the arch and disperse the residue to prevent the residue from coking. The inclined material guide and air distribution plate 30 plays a role in guiding the material, which is conducive to the rapid discharge of the residue and prevents the residue from accumulating in the cooling air box 29.

[0055] The present invention improves the utilization rate of solid waste materials, and the utilization rate of the calorific value of the materials can be increased by more than 85%. It can not only reduce the coal consumption of cement enterprises, but also reduce the emission of carbon dioxide. On the basis of the existing process, it can reduce the amount of ammonia water used by 15%, and ultimately achieve a significant reduction in the production cost of cement clinker.

[0056] The present invention is not subject to the shutdown restrictions of cement kilns, can greatly improve the solid waste disposal capacity and efficiency, reduce the idleness of supporting main equipment, meet the function of other material disposal, and cover cement kilns, metallurgy, coal-fired power generation and other industry application scenarios. In particular, in cement kiln applications, the high-temperature combustible gas formed after graded gasification by the continuous rotary arch-breaking boiling gasification furnace device 4 is connected to the cement kiln decomposition furnace as a reducing agent, and by reducing the generation of nitrogen oxides in the cement kiln decomposition furnace and the pre-decomposition system, the multiple effects of reducing nitrogen oxide emissions, saving coal consumption and disposing of solid waste are achieved, and ultimately the purpose of reducing coal consumption costs and denitrification costs is achieved. At the same time, the reducing combustible gas generated is condensed and dechlorinated after passing through the circulating cooling device 17, reducing the introduction of chloride ions in the combustible gas in the cement kiln decomposition furnace, not only increasing the utilization of solid alternative raw material fuels, but also reducing the influence of chloride ions on the quality of clinker.

[0057] Technical features not described in the present invention can be implemented by existing technologies and will not be described in detail here. The present invention is not limited to the above-mentioned specific embodiments, and changes, modifications, additions or substitutions made by ordinary technicians in this field within the scope of the essence of the present invention should also fall within the scope of protection of the present invention.

Claims

1. Equipment that is used for coal-fired kiln raw material fuel replacement, dechlorination and denitrification, and coordinated solid waste disposal, and is characterized by: include The continuous rotary arch-breaking boiling gasification furnace device is used as a solid waste calcining furnace to realize boiling calcination or stacking calcination of solid waste materials; an arch-breaking device is arranged inside the device to prevent the solid waste materials from coking; during the shutdown period of the cement kiln, the device is used to realize the boiling calcination of solid waste materials, and an oxygen combustion atmosphere is formed in the furnace body; during the normal operation of the cement kiln, the device realizes the stacking calcination of solid waste materials, and a reducing atmosphere is formed in the furnace body to realize the denitration function of the cement kiln system. At the same time, the reducing atmosphere can be burned in the cement kiln system to generate heat, which can reduce the amount of coal used; The secondary combustion and gas-solid separation device is used for the secondary combustion and gas-solid separation of combustible gas discharged from the continuous rotary arch-breaking boiling gasification furnace device, and its air inlet end is connected to the air outlet of the continuous rotary arch-breaking boiling gasification furnace device, and its air outlet is connected to the circulating cooling device and the cement kiln decomposition furnace; The circulating cooling device is located at the bottom of the continuous rotary arch-breaking boiling gasification furnace device. It is used for the residue discharged from the continuous rotary arch-breaking boiling gasification furnace device and the chloride-containing flue gas discharged from the secondary combustion and gas-solid separation device and the cement kiln, and for introducing the chloride-containing flue gas introduced into the cement kiln for calcining, so that the chloride ions in the chloride-containing flue gas are condensed and discharged with the residue, thereby realizing the dechlorination of the chloride-containing flue gas.

2. The equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification and coordinated solid waste disposal according to claim 1 is characterized in that: It also includes a control system for controlling the continuous rotary arch-breaking boiling gasification furnace device, the secondary combustion and gas-solid separation device, the circulating cooling device and the cement kiln to work in coordination, so that the continuous rotary arch-breaking boiling gasification furnace device can be switched between the two combustion atmosphere states of boiling calcination and stacking calcination.

3. The equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification and coordinated solid waste disposal according to claim 1 is characterized in that: The secondary combustion and gas-solid separation device is provided with a denitration catalyst injection port. The denitration catalyst is ash containing ammonia and alkali components. Ammonia is generated in the secondary combustion and gas-solid separation device to denitrate the hot gas.

4. The equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification and coordinated solid waste disposal according to claim 1 is characterized in that: The outlet end of the secondary combustion and gas-solid separation device is connected to a three-way high-temperature reduction combustible gas outlet pipe, one outlet of the high-temperature reduction combustible gas outlet pipe is connected to a circulating cooling device through a circulating air duct equipped with a control valve, and the other outlet is connected to a cement kiln system through a pipeline, and the middle section of the circulating air duct is connected to the cement kiln system through a hot air inlet pipe, and high-temperature gas or high-temperature gas containing chloride ions can be introduced from the cement kiln system; a real-time online chloride ion detector is installed in the high-temperature reduction combustible gas outlet pipe, and the real-time online chloride ion detector is connected to the control system, and the real-time online chloride ion detector monitors the chloride ion concentration in the chloride ion-containing flue gas discharged from the outlet in real time, and feeds back the monitoring results to the control system in real time.

5. The equipment for coal-fired kiln raw material fuel replacement, dechlorination, denitrification and coordinated solid waste disposal according to claim 1 is characterized in that: The arch breaking device includes a fluidizing plate arranged in the inner cavity of the continuous rotary arch breaking boiling gasification furnace device, the fluidizing plate is a conical structure or a spherical arch structure, the fluidizing plate is driven to rotate by a power device through a hollow shaft tube, a plurality of ventilation holes are opened on the fluidizing plate, and the cavity located below the fluidizing plate in the inner cavity of the continuous rotary arch breaking boiling gasification furnace device is connected to the fluidizing fan through a hollow shaft tube and an air pipe, a plurality of arch breaking protrusions are arranged on the upper surface of the fluidizing plate, and a gap is left between the periphery of the fluidizing plate and the inner wall of the continuous rotary arch breaking boiling gasification furnace device as a material discharge channel.

6. The equipment for coal-fired kiln raw material fuel replacement, dechlorination, denitrification and coordinated solid waste disposal according to any one of claims 1 to 5, characterized in that: The circulating cooling device includes a cooling bellows connected to the bottom of the continuous rotary arch-breaking boiling gasification furnace device, a water-cooling coil is installed inside the cooling bellows, a cooling fan is connected to the bottom of the cooling bellows, the outlet end of the circulating air duct is connected to the cooling bellows through a high-temperature circulating fan, the cooling bellows is connected to the inlet end of the waist air duct of the continuous rotary arch-breaking boiling gasification furnace device, the outlet end of the waist air duct is connected to the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device or is connected by a bypass to the outlet of the high-temperature reducing combustible gas outlet duct connected to the cement kiln system.

7. The equipment for coal-fired kiln raw material fuel replacement, dechlorination, denitrification and coordinated solid waste disposal according to claim 6 is characterized in that: The cooling wind box is also connected to a material sealing pipe, the outlet end of the material sealing pipe is a slag discharge port, and an inclined material guiding and air distributing plate is also installed in the cooling wind box. The inclined material guiding and air distributing plate is located below the water cooling coil, and ventilation holes are provided on the inclined material guiding and air distributing plate. The lowest end of the inclined material guiding and air distributing plate is flush with the lower edge of the inner wall of the inlet end of the material sealing pipe.

8. The equipment for coal-fired kiln raw material fuel replacement, dechlorination, denitrification and coordinated solid waste disposal according to claim 7 is characterized in that: The area at the bottom of the inner cavity of the continuous rotary arch-breaking boiling gasification furnace device, which is located above the fluidizing plate, is the boiling zone. The inner cavity of the continuous rotary arch-breaking boiling gasification furnace device is divided into three parts from bottom to top, namely, a low-temperature zone, a high-temperature zone and a constant temperature zone. The low-temperature zone, the high-temperature zone and the constant temperature zone are all provided with real-time temperature and pressure monitors, and the temperature and pressure monitors are connected to the control system; the temperature of the low-temperature zone is 600-700°C, the temperature of the high-temperature zone is 1000-1100°C, and the temperature of the constant temperature zone is 900-950°C.

9. The equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification and coordinated solid waste disposal according to claim 8 is characterized in that: A feed port is provided at the upper end of the continuous rotary arch-breaking boiling gasification furnace device, a distributor is installed in the feed port, a material bed distributor and a fluid nozzle are connected to the middle section of the continuous rotary arch-breaking boiling gasification furnace device, and a dechlorination catalyst addition port is provided in the circulating air duct near its outlet end.

10. The equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification and coordinated solid waste disposal according to claim 9 is characterized in that: The output temperature of the secondary combustion and gas-solid separation device is 800°C-900°C.

11. The equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification and coordinated solid waste disposal according to claim 10 is characterized in that: The slag outlet of the secondary combustion and gas-solid separation device is connected to the continuous rotary arch-breaking boiling gasification furnace device or to the material discharge chute through a screw feeder.

12. The equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification and coordinated solid waste disposal according to claim 11, characterized in that: When the cement kiln is shut down, 5%-10% by weight of limestone is added to the solid waste, and the limestone and solid waste are calcined together in a continuous rotary arch-breaking boiling gasification furnace device under aerobic conditions to neutralize the acidic gas and generate neutral high-temperature gas. The generated neutral high-temperature gas enters the cement kiln waste heat boiler for power generation, which is suitable for reusing idle waste heat power generation equipment when the cement kiln and metallurgical kiln are shut down; the generated neutral high-temperature gas can also be used alone to prepare high-temperature steam.

13. The equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification and coordinated solid waste disposal according to claim 12 is characterized in that: While solid waste materials are added into the continuous rotary arch-breaking boiling gasification furnace device through the feed inlet, a dechlorination catalyst is added through the dechlorination catalyst addition port. The dechlorination catalyst is a rare earth-based catalyst containing nickel, palladium and rhodium components. By mass percentage, the contents of nickel, palladium and rhodium components are 1.5%, 0.3% and 0.1% respectively, and the rare earth content is 5%. The amount of dechlorination catalyst added is 0.1% of the amount of solid waste materials added.

14. The equipment for coal-fired kiln raw material fuel replacement, dechlorination and denitrification and coordinated solid waste disposal according to claim 13, characterized in that: The continuous rotary arch-breaking boiling gasification furnace device can be independently used for calcining inorganic non-metallic minerals, and the inorganic non-metallic minerals include bauxite, graphite ore, coal gangue, lignite, potassium feldspar, aluminum slag, red mud, gold cyanide tailings, saw mud and contaminated soil, and fly ash.

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