Multi-point blanking energy-saving type alternative fuel combustion system of kiln tail preheater decomposing furnace
By setting up a multi-point cutout and step combustion structure in the kiln tail preheater decomposition furnace, the problem of low fuel substitution rate in the cement industry is solved, and efficient combustion and system stability of alternative fuels are achieved.
Patent Information
- Application Number
- CN202421917804.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-04-15
- Estimated Expiration
- 2034-08-09
AI Technical Summary
The existing cement industry has problems with few types of fuels and insufficient replacement amounts in terms of fuel substitution, resulting in a low fuel substitution rate and affecting the system's thermal engineering system.
A multi-point cut-off energy-saving alternative fuel combustion system for decomposition furnaces with kiln tail preheater decomposition furnaces was designed. By setting three cut-off ports at different locations of the main body of the decomposition furnace and setting a step combustion structure at the top inlet ports, flexible selection and mixing of alternative fuels of different types, density and particle sizes are realized to ensure complete combustion.
Multi-point cutting of alternative fuels is achieved, and the feeding volume is increased by more than 50%, ensuring the complete combustion of large-particle fuels and reducing the impact on the rotary kiln calcination system.
Smart Images
Figure CN222761405U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of combustion systems of kiln tail preheater decomposition furnaces, in particular to a multi-point unloading energy-saving alternative fuel combustion system of a kiln tail preheater decomposition furnace. Background Art
[0002] The second generation of new dry process cement proposed by China Building Materials Federation, one of its characteristics is "waste safe and harmless disposal and resource utilization technology", which points out that under environmental conditions and needs, the utilization of waste, urban garbage and alternative fuels can reach 40%; according to statistics, the fuels of China's cement industry are mainly coal and natural gas, and the time of adopting alternative fuels is short, and the types of fuels are few. Only more than 10 cement plants use alternative fuels, and the annual replacement amount is less than 50,000 tons of standard coal, and the overall fuel replacement rate is low; as early as 2005, the replacement ratio of combustible waste in the Dutch cement industry was as high as 83%, and the average replacement fuel utilization rate was between 20% and 40%, and the European and American cement industries use waste tires, solid waste, meat and bones discarded by the slaughtering industry, waste plastics, waste oil and biomass fuels, etc. With the continuous rise in energy prices, we are forced to seek new solutions under the challenge of the shortage of traditional fossil fuels. Alternative fuels (RDF / SRF) can not only meet our demand for energy, but also convert combustible solid waste into energy, thus realizing the recycling of resources. However, due to the limitation of processing machinery, the particle size of alternative fuels with higher calorific value is about 50mm, and the burnout rate is not good. Rubber materials with larger particles will directly enter the kiln, affecting the thermal system of the system. In view of this, in-depth research was conducted on the above-mentioned issues, which led to this case. Utility Model Content
[0003] In view of the deficiencies of the prior art, the utility model provides a multi-point unloading energy-saving alternative fuel combustion system for a preheater decomposition furnace at the kiln tail, solving the problems raised in the background technology.
[0004] To achieve the above objectives, the utility model is implemented through the following technical solutions: a multi-point unloading energy-saving alternative fuel combustion system for a kiln tail preheater decomposition furnace, including a decomposition furnace main body connected to a rotary kiln smoke chamber, the decomposition furnace main body is connected to a five-stage cyclone separation cylinder, the decomposition furnace main body includes a No. 1 cylinder, a No. 2 cylinder and a No. 3 cylinder from bottom to top, a first unloading port is provided at the connection position between the side of the No. 1 cylinder and the tertiary air duct, a second unloading port is provided at the top of the No. 1 cylinder, a third unloading port is provided at the top of the No. 2 cylinder, a stepped combustion structure is provided at the position of the third unloading port, a fuel supply mechanism is provided on one side of the decomposition furnace main body, the fuel supply mechanism is connected to each unloading port through a feeding pipe and a guide pipe, and a primary sieve plate and a secondary sieve plate are provided between the feeding pipe and the guide pipe.
[0005] The stepped combustion structure comprises a plurality of steps constructed by castable materials, and air cannons are arranged on the plurality of steps.
[0006] The feeding positions of the first feeding port, the second feeding port and the third feeding port are all provided with rotary feeding devices.
[0007] The sieve hole diameter of the above-mentioned first-level sieve plate is larger than the sieve hole diameter of the second-level sieve plate.
[0008] The fuel supply mechanism comprises a hopper, a first conveyor is provided at the outlet end of the hopper, a wire belt elevator is provided at the discharge end of the first conveyor, a second conveyor is provided at the discharge end of the wire belt elevator, and a quantitative supply component is provided at the discharge end of the second conveyor.
[0009] The quantitative supply component comprises a weighing bin, a rod valve is arranged at the bottom of the weighing bin, and a speed-adjustable belt scale is arranged at the lower part of the rod valve.
[0010] The utility model provides a multi-point feeding and energy-saving alternative fuel combustion system for a preheater decomposition furnace at the end of a kiln. It has the following beneficial effects: the multi-point feeding and energy-saving alternative fuel combustion system for a preheater decomposition furnace at the end of a kiln improves the existing preheater decomposition furnace body at the end of a kiln, and three feeding ports are set at different positions of the decomposition furnace body. The feeding ports can be flexibly selected for feeding according to the density, particle size and burnout rate of the alternative fuel. At the same time, a stepped combustion structure is set at the top-level feeding port. Alternative fuels of different types, densities and particle sizes can be mixed and fed, and enter different feeding ports through sieve plate sorting, so as to realize multi-point feeding and increase the feeding amount of alternative fuel by more than 50%; large-particle alternative fuels are burned at the position of the stepped combustion structure, which prolongs the combustion time and ensures that the alternative fuel is completely burned in the decomposition furnace, and will not directly enter the rotary kiln due to density and particle size reasons, thereby reducing the impact on the rotary kiln calcining system. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic diagram of the main structure of the multi-point unloading energy-saving alternative fuel combustion system of the kiln tail preheater decomposition furnace of the utility model.
[0012] Figure 2 It is a partially enlarged structural schematic diagram of the stepped combustion structure of the utility model.
[0013] Figure 3 For this utility model Figure 1 Schematic diagram of the local enlarged structure at position a.
[0014] In the figure: 1. decomposition furnace body; 2. tertiary air duct; 3. first discharge port; 4. second discharge port; 5. third discharge port; 6. feeding pipe; 7. guide pipe; 8. primary sieve plate; 9. multi-step steps; 10. air cannon; 11. rotary discharger; 12. hopper; 13. first conveyor; 14. wire belt elevator; 15. second conveyor; 16. weighing bin; 17. rod valve; 18. speed-adjusting belt scale; 1001. gas storage tank; 1002. electromagnetic pulse valve; 1003. compressed air injection pipe; 101. No. 1 cylinder; 102. No. 2 cylinder; 103. No. 3 cylinder. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0016] Embodiment: In conjunction with the specification Figure 1-3It can be seen that in order to solve the problem in the prior art that the alternative fuel with higher calorific value has larger particle size and poor burnout, especially the rubber-like materials with larger particles will directly enter the kiln, affecting the thermal system of the system, a multi-point unloading energy-saving alternative fuel combustion system of the kiln tail preheater decomposition furnace is designed, including a decomposition furnace body 1 connected to the rotary kiln smoke chamber, the decomposition furnace body 1 is connected to the five-stage cyclone separation cylinder, the decomposition furnace body 1 includes a first cylinder 101, a second cylinder 102 and a third cylinder 103 from bottom to top, and the side of the first cylinder 101 A first discharge port 3 is provided at the connection position with the tertiary air duct 2, where alternative fuels with a relatively light density and a particle size of less than 15 mm are mainly used, including straw, fiber fragments, etc.; a second discharge port 4 is provided at the top of the first drum 101, where alternative fuels with a relatively heavy density and a particle size of 15-30 mm are mainly used, including sawdust, recycled film, etc.; a third discharge port 5 is provided at the top of the second drum 102, where alternative fuels with a heavy density and a particle size of 30-50 mm are mainly used, including rubber fragments, tire fragments, etc.; the third discharge port 5 is provided at the position of There is a stepped combustion structure; a fuel supply mechanism is arranged on one side of the decomposition furnace body 1, and the fuel supply mechanism is connected with each discharge port through a feed pipe 6 and a guide pipe 7, and a primary sieve plate 8 and a secondary sieve plate are arranged between the feed pipe 6 and the guide pipe 7, and the sieve hole diameter of the primary sieve plate 8 is larger than the sieve hole diameter of the secondary sieve plate, and the aperture gap of the primary sieve plate 8 is 30mm; the aperture gap of the secondary sieve plate is 15mm; the existing kiln tail preheater decomposition furnace body is improved, and three discharge ports are arranged at different positions of the decomposition furnace body, according to the density of the alternative fuel At the same time, a stepped combustion structure is set at the top-level feeding port. Alternative fuels of different types, densities and particle sizes can be mixed and fed, and enter different feeding ports through sieve plate sorting to achieve multi-point feeding and increase the feeding amount of alternative fuel by more than 50%; large-particle alternative fuels are burned at the position of the stepped combustion structure, which prolongs the combustion time and ensures that the alternative fuels are completely burned in the decomposition furnace. They will not directly enter the rotary kiln due to density and particle size reasons, reducing the impact on the rotary kiln calcining system.
[0017] In the specific implementation process, as a preferred setting, the above-mentioned stepped combustion structure includes a multi-level step 9 constructed by a castable, the step is 1500mm long, 400mm high, and 500mm wide, and 4-5 levels can be set; the multi-level steps 9 are all provided with an air cannon 10, and the air cannon 10 is controlled by an electromagnetic pulse valve 1002, and reciprocates from top to bottom to knock out the alternative fuel residue after combustion. In the specific use process, the air compressor can be used to add high-pressure air to the air storage tank 1001 through the air pressure injection pipe 1003 as the power source of the air cannon 10.
[0018] In the specific implementation process, as a preferred setting, the feeding positions of the above-mentioned first feeding port 3, the second feeding port 4 and the third feeding port 5 are all provided with a rotary feeder 11, and the rotary feeder 11 can prevent air leakage in the system and further ensure the sealing of the fuel supply system.
[0019] In the specific implementation process, as a preferred setting, the above-mentioned fuel supply mechanism includes a hopper 12, a first conveyor 13 is provided at the outlet end of the hopper 12, a wire belt elevator 14 is provided at the discharge end of the first conveyor 13, a second conveyor 15 is provided at the discharge end of the wire belt elevator 14, and a quantitative supply component is provided at the discharge end of the second conveyor 15, wherein the quantitative supply component includes a weighing bin 16, a rod valve 17 is provided at the bottom of the weighing bin 16, and a speed-adjusting belt scale 18 is provided at the lower part of the rod valve 17. When in use, the substitute fuel particles are passed through the bin and The first conveyor 13 enters the wire belt hoist 14, and is lifted by the wire belt hoist 14 and supplied to the second conveyor 15. The second conveyor 15 is put into the weighing bin 16, and the weighing bin 16 controls the feeding amount. After weighing, the rod valve 17 is opened, and the alternative fuel particles are put into the speed-adjusting belt scale 18 for secondary weighing. The speed-adjusting belt scale 18 is used to adjust the feeding speed and control the feeding amount. The alternative fuel particles enter the feeding pipe 6 through the material dividing chute and are preliminarily screened at the position of the primary screen plate 8. The small particles after the preliminary screening are The granular fuel further enters the secondary sieve plate for secondary screening; at this time, the alternative fuel with a lighter density and a particle size of less than 15mm enters the decomposition furnace body 1 through the first feed port 3; the alternative fuel with a heavier density and a particle size of 15-30mm enters through the second feed port 4; the alternative fuel with a heavier density and a particle size of 30-50mm enters the stepped combustion structure position; due to the smaller feeding particle sizes of the first feed port 3 and the second feed port 4, the alternative fuel entering the decomposition furnace body 1 moves upward under negative pressure and enters with the hot flue gas. Enter the five-stage cyclone and burn out in a relatively short time; the material density and particle size of the third discharge port 5 are large, and it cannot move upward under negative pressure, so a stepped combustion structure is set at the discharge port, and the alternative fuel falls on multiple steps and burns under the action of the system temperature. An air cannon 10 is set on each step, and the air cannon 10 reciprocates from top to bottom to knock out the residue of the alternative fuel after combustion, which moves upward under the action of negative pressure and enters the five-stage cyclone with the hot flue gas, and burns out in a relatively short time. The characteristics of this combustion system are: the feed ports of different types of alternative fuels can be switched flexibly, and alternative fuels of different materials and particle sizes can be burned out, and will not affect the rotary kiln calcining system.
[0020] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A multi-point unloading energy-saving alternative fuel combustion system for a preheater calciner at the kiln tail, comprising a calciner body connected to a rotary kiln smoke chamber, wherein the calciner body is connected to a five-stage cyclone separation cylinder, and is characterized in that: The decomposition furnace body includes a No. 1 drum, a No. 2 drum and a No. 3 drum from bottom to top. A first discharge port is arranged at the connection position between the side of the No. 1 drum and the tertiary air duct, a second discharge port is arranged at the top of the No. 1 drum, a third discharge port is arranged at the top of the No. 2 drum, and a stepped combustion structure is arranged at the position of the third discharge port. A fuel supply mechanism is arranged on one side of the decomposition furnace body, and the fuel supply mechanism is connected with each discharge port through a feeding pipe and a material guide pipe. A primary sieve plate and a secondary sieve plate are arranged between the feeding pipe and the material guide pipe.
2. The multi-point unloading energy-saving alternative fuel combustion system for the preheater decomposition furnace at the kiln tail according to claim 1 is characterized in that: The stepped combustion structure comprises a plurality of steps constructed by castable materials, and air cannons are arranged on the plurality of steps.
3. The multi-point unloading energy-saving alternative fuel combustion system for the preheater decomposition furnace at the kiln tail according to claim 1 is characterized in that: The feeding positions of the first feeding port, the second feeding port and the third feeding port are all provided with rotary feeding devices.
4. The multi-point unloading energy-saving alternative fuel combustion system for the preheater decomposition furnace at the kiln tail according to claim 1 is characterized in that: The sieve hole diameter of the primary sieve plate is larger than the sieve hole diameter of the secondary sieve plate.
5. The multi-point unloading energy-saving alternative fuel combustion system for the preheater decomposition furnace at the kiln tail according to claim 1 is characterized in that: The fuel supply mechanism comprises a hopper, a first conveyor is provided at the outlet end of the hopper, a wire belt elevator is provided at the discharge end of the first conveyor, a second conveyor is provided at the discharge end of the wire belt elevator, and a quantitative supply component is provided at the discharge end of the second conveyor.
6. The multi-point unloading energy-saving alternative fuel combustion system for the preheater calciner at the kiln tail according to claim 5 is characterized in that: The quantitative supply component comprises a weighing bin, a rod valve is arranged at the bottom of the weighing bin, and a speed-adjustable belt scale is arranged at the lower part of the rod valve.