Magnesite calcining furnace taking natural gas as fuel
By using a magnesite calciner fueled by natural gas and a methane steam reforming reactor to convert natural gas into hydrogen, combined with the design of induced draft and cooling zones, the problems of high energy consumption and large carbon emissions in the traditional magnesite magnesium oxide production have been solved, achieving efficient utilization of clean energy and energy conservation and emission reduction.
Patent Information
- Application Number
- CN202411837832.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2026-01-23
AI Technical Summary
The traditional process of producing magnesium oxide from magnesite is energy-intensive and produces a large amount of carbon emissions. Clean energy should be used to replace high-energy-consuming energy sources in order to achieve energy conservation and environmental protection.
Using natural gas as fuel, the gas is converted into hydrogen through a methane steam reformer. This hydrogen is then used to heat the refractory balls in the burner to generate high-temperature steam, which reacts with magnesite in the vertical furnace to produce magnesium oxide. Combined with the design of the induced draft structure and cooling zone, fuel utilization is optimized and carbon emissions are reduced.
It has achieved efficient use of clean energy, reduced carbon emissions, improved fuel utilization efficiency, and reduced energy consumption.
Smart Images
Figure CN121377569A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application relates to a magnesite calcining furnace using natural gas as fuel and belongs to the technical field of magnesite smelting shaft furnaces. BACKGROUND
[0002] Traditional magnesite is usually calcined at high temperature using coal as fuel, which not only consumes a large amount of energy but also produces a large amount of carbon dioxide, affecting the ecological environment. With the continuous progress of science and technology and the publicity of energy saving and environmental protection concepts, people have increasingly realized that it is an inevitable trend to replace high-energy consumption energy with clean energy. SUMMARY
[0003] The application aims to provide a magnesite calcining furnace using natural gas as fuel, which uses natural gas as fuel, and the high-temperature heat produced by combustion is used for high-temperature steam required for the preparation of magnesia, thereby saving energy and reducing carbon emissions and realizing energy saving and environmental protection.
[0004] To solve the above problems, the specific technical scheme of the application is as follows: a magnesite calcining furnace using natural gas as fuel, which comprises a feeding channel at the top of a shaft furnace; an air induction drum is arranged at the center of the shaft furnace, the top of the air induction drum is provided with a material guide top plate, and the material guide top plate is arranged below the material guide top plate, the bottom of the air induction drum is communicated with the outside through an air induction fan; an annular cavity is arranged between the shaft furnace and the air induction drum, the upper part of the annular cavity is a reaction zone, the lower part is a cooling zone, and the bottom of the cooling zone is an annular material outlet; a plurality of combustion chambers are uniformly distributed around the cooling zone near the material outlet, natural gas is introduced into the burner of each combustion chamber as raw material, high-temperature steam is produced, and the high-temperature steam rises and reacts with magnesite in the reaction zone in the feeding channel to generate magnesia, which is discharged from the material outlet.
[0005] Each combustion chamber is externally provided with a methane steam reforming reactor, the inlet end of the methane steam reforming reactor is connected with a gas pipeline and a water supply system respectively, hydrogen gas is produced at the outlet end of the methane steam reforming reactor, and the outlet end is connected with the inlet of the burner, and the combustion port of the burner is located in the combustion chamber.
[0006] The bottom surface of the combustion chamber is a hollow support plate, and a plurality of refractory balls are stacked on the support plate.
[0007] An air pipeline is connected to the outlet pipeline of the methane steam reforming reactor.
[0008] A circumferential oxygen supply ring is arranged on the outer surface of the shaft furnace, and the oxygen supply ring is located below the combustion chamber, and the branch pipeline of the oxygen supply ring extends into the shaft furnace.
[0009] The outer surface of the shaft furnace is provided with circumferentially arranged air annular pipeline and gas annular pipeline, and each methane steam reforming reactor is connected with air pipeline and gas pipeline respectively through valves.
[0010] The methane steam reforming reactor and part of the air pipeline are located in the cooling zone of the shaft furnace.
[0011] A recovery frame is arranged below the material outlet, and a collection barrel is arranged on the recovery frame; a transmission motor is arranged on the top of the recovery frame, and the output shaft of the transmission motor is connected with a pinion; a material collecting plate is arranged at the material outlet, and a gear ring is arranged at the lower part of the material collecting plate, and the pinion is in meshing transmission with the gear ring; a sun gear and a driven gear are arranged at the lower part of the recovery frame, and the sun gear and the driven gear are respectively in contact and cooperation with the upper surface and the side surface of the track arranged on the ground; a scraper is arranged on the top of the recovery frame and matched with the material collecting plate.
[0012] A cutting inclined feeding car track is arranged outside the feeding channel, and a feeding car is slidably connected on the feeding car track; one end of a turnover connecting rod is connected with a rotating shaft on the feeding car, and the other end of the turnover connecting rod is connected with a traction rope; a transition platform is arranged at the top of the feeding car track, and a guide wheel is arranged at the top of the feeding car track; the traction rope passes through the guide wheel and is connected with an external power device; the feeding car is pulled to the transition platform, and the material in the feeding car enters the feeding channel.
[0013] The natural gas fuelled magnesite calcining furnace of the present application adopts the above structure and has the following advantages: 1. The feeding structure of the two sides into the center of the air guide, and the combustion furnace is located at the circumferential bottom of the shaft furnace, so that the high-temperature water vapor moves upward in the shaft furnace under the action of the air guide fan, and reacts with the uniformly falling magnesite in the reaction zone; 2. The natural gas and water are catalytically reacted in the methane steam reforming reactor, and the methane in the natural gas is further converted into hydrogen as fuel, and the high-temperature water vapor is generated by heating the refractory ball through the burner, so that the clean energy is efficiently utilized, and the carbon emission is reduced; 3. The methane steam reforming reactor and part of the air pipeline are located in the cooling zone of the shaft furnace, so that the preheating of the gas to be combusted is realized, thereby saving fuel. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 It is a whole structure diagram of the natural gas fuelled magnesite calcining furnace.
[0015] Figure 2 It is an enlarged view of A of Figure 1
[0016] Figure 3 It is an enlarged view of B of Figure 1 DETAILED DESCRIPTION
[0017] As shown in Figure 1 and Figure 2 A natural gas fuelled magnesite calcining furnace, the top of the shaft furnace 20 is the feed channel 21; the center of the shaft furnace 20 is provided with the induced draft fan 22, the top of the induced draft fan 22 is provided with the guide top plate 23, and the guide top plate 23 is located below the guide top plate 23, the top of the induced draft fan 22 is communicated with the inner cavity of the shaft furnace 20, and the bottom of the induced draft fan 22 is communicated with the outside through the induced draft fan 19; the annular cavity is arranged between the shaft furnace 20 and the induced draft fan 22, the upper part of the annular cavity is the reaction zone, the lower part is the cooling zone, and the bottom of the cooling zone is the annular material outlet 18; a plurality of combustion chambers 8 are uniformly distributed on the circumference of the cooling zone close to the material outlet 18, natural gas as raw material is introduced into the burner 7 of each combustion chamber 8 to produce high-temperature steam which rises and reacts with magnesite in the reaction zone of the feed channel 21 to generate magnesium oxide, and is discharged from the material outlet 18.
[0018] Each combustion chamber is provided with a methane steam reforming reactor 10 outside, the methane steam reforming reactor 10 is an existing device, which can react methane in natural gas with water to produce hydrogen gas used as fuel; the inlet end of the methane steam reforming reactor 10 is connected with the gas pipeline 5 and the water supply system 11 respectively, the outlet end of the methane steam reforming reactor 10 produces hydrogen gas, which is connected with the inlet of the burner 7 through a pipeline, and the combustion port of the burner 7 is located above the combustion chamber 8. The bottom surface of the combustion chamber 8 is a hollow support plate 8-1, which provides sufficient oxygen in the air during the combustion process of the burner; a plurality of refractory balls 8-2 are stacked on the support plate 8-1. Hydrogen gas is burned in the burner 7 as fuel, continuously heating the refractory balls 8-2, and the produced high-temperature gas moves upward under the action of the induced draft fan 19.
[0019] The outlet pipeline of the methane steam reforming reactor 10 is connected with the air pipeline 4. The outer surface of the shaft furnace 20 is provided with a circumferentially arranged air annular pipeline 24 and a gas annular pipeline 25, and the air pipeline 4 and the gas pipeline 5 connected with each methane steam reforming reactor 10 are respectively connected with the air annular pipeline 24 and the gas annular pipeline 25 through valves, so as to ensure that sufficient reaction gas is filled into each combustion chamber at the same time. Among them, the methane steam reforming reactor 10 and part of the air pipeline 4 are located in the cooling zone of the shaft furnace 20, so that the gas entering the burner 7 has absorbed the residual heat of the product in the cooling zone, reducing the cumbersome step of heating and reburning the cold gas in the burner, thereby saving fuel and achieving good energy-saving effect.
[0020] The outer surface of the shaft furnace 20 is provided with a circumferentially arranged oxygen supply ring 9, and the oxygen supply ring 9 is located below the combustion chamber 8, and the branch pipeline of the oxygen supply ring 9 extends into the shaft furnace 20. The oxygen supply ring 9 provides the necessary oxygen for the material reaction and the burner combustion, avoiding insufficient reaction.
[0021] The material outlet 18 is provided below with a recycling frame 27, and a collecting barrel 14 is arranged on the recycling frame 27; the top of the recycling frame 27 is provided with a transmission motor 15, the output shaft of the transmission motor 15 is connected with a pinion; a material collecting plate 28 is arranged at the material outlet 18, the lower part of the material collecting plate 28 is provided with a gear ring 13, the pinion is in meshing transmission with the gear ring 13; a sun gear 16 and a driven gear 17 are arranged at the lower part of the recycling frame 27, and the sun gear 16 and the driven gear 17 are respectively in contact and cooperation with the upper surface and the side surface of the annular track 26 arranged on the ground surface. When the transmission motor 15 drives the pinion to rotate, the sun gear 16 and the driven gear 17 on the recycling frame 27 are guided and act on the annular track 26 to run in a circle, and the top of the recycling frame 27 is in a scraper structure, so that the material on the material collecting plate 28 is rotated and stacked and then falls into the collecting barrel 14.
[0022] As shown in Figure 3 The feeding channel 21 is externally provided with an oblique feeding trolley track 31, the feeding trolley track 31 is slidably connected with a feeding trolley 32, one end of a turnover connecting rod 33 is connected with the feeding trolley 32 through a rotating shaft, and the other end of the turnover connecting rod 33 is connected with a traction rope 34; a transition platform 35 is arranged at the top of the feeding trolley track 31, a guide wheel 36 is arranged at the top of the feeding trolley track 31, and the traction rope 34 is connected with an external power device through the guide wheel 36; the feeding trolley 32 is pulled to the transition platform 35, and the material in the feeding trolley 32 enters the feeding channel 21. When the feeding trolley 32 is pulled up by the traction rope 34, the turnover connecting rod 33 is in a straight line with the traction rope 34, when the front wheel of the feeding trolley 32 reaches the transition platform 35, the turnover connecting rod 33 rotates, the feeding trolley 32 gradually enters the transition platform 35, and the rear end of the feeding trolley 32 is lifted until the material is poured into the feeding channel 21; when the traction rope 34 is loosened, the rear end of the feeding trolley 32 does not enter the transition platform 35, and under the action of gravity, the feeding trolley 32 returns to the feeding trolley track 31 and retreats to the original position.
Claims
1. A magnesite calcining furnace fuelled by natural gas, characterised in that: The top of the shaft furnace (20) is provided with a feeding channel (21); a draft tube (22) is arranged in the center of the shaft furnace (20), the top of the draft tube (22) is provided with a material guide top plate (23), the material guide top plate (23) is arranged below the material guide top plate (23), the bottom of the draft tube (22) is communicated with the outside through a draft fan (19); an annular cavity is arranged between the shaft furnace (20) and the draft tube (22), the upper part of the annular cavity is a reaction zone, the lower part is a cooling zone, the bottom of the cooling zone is an annular material outlet (18); a plurality of combustion chambers (8) are uniformly distributed in the circumferential direction of the cooling zone near the material outlet (18), natural gas is introduced into the burner (7) of each combustion chamber (8) as raw material, high-temperature water vapor rises and reacts with magnesite in the feeding channel (21) in the reaction zone to generate magnesium oxide, and is discharged from the material outlet (18).
2. The natural gas fired magnesite calciner of claim 1, wherein: Each combustion chamber is externally provided with a methane steam reforming reactor (10), the inlet end of the methane steam reforming reactor (10) is connected with a gas pipeline (5) and a water supply system (11) respectively, hydrogen is produced at the outlet end of the methane steam reforming reactor (10), and the outlet end is connected with the inlet of the burner (7), and the combustion port of the burner (7) is located in the combustion chamber (8).
3. The natural gas fired magnesite calciner of claim 2, wherein: The bottom surface of the combustion chamber (8) is a hollow support plate (8-1), and a plurality of refractory balls (8-2) are stacked on the support plate (8-1).
4. The natural gas fired magnesite calciner of claim 2, wherein: The outlet pipeline of the methane steam reforming reactor (10) is connected with an air pipeline (4).
5. The natural gas fired magnesite calciner of claim 2, wherein: The outer surface of the shaft furnace (20) is provided with a circumferentially arranged oxygen supply ring (9), and the oxygen supply ring (9) is located below the combustion chamber (8), and the branch pipeline of the oxygen supply ring (9) extends into the shaft furnace (20).
6. The natural gas fired magnesite calciner of claim 4, wherein: The outer surface of the shaft furnace (20) is provided with a circumferentially arranged air annular pipeline (24) and a gas annular pipeline (25), and the air pipeline (4) and the gas pipeline (5) connected with each methane steam reforming reactor (10) are respectively connected with the air annular pipeline (24) and the gas annular pipeline (25) through valves.
7. The natural gas fired magnesite calciner of claim 4, wherein: The methane steam reforming reactor (10) and part of the air pipeline (4) are located in the cooling zone of the shaft furnace (20).
8. The natural gas fired magnesite calciner of claim 1, wherein: A recovery frame (27) is arranged below the material outlet (18), and a collection barrel (14) is arranged on the recovery frame (27); a transmission motor (15) is arranged on the top of the recovery frame (27), and the output shaft of the transmission motor (15) is connected with a pinion; a material collecting plate (28) is arranged at the material outlet (18), and a gear ring (13) is arranged at the lower part of the material collecting plate (28), the pinion is in meshing transmission with the gear ring (13); a sun gear (16) and a driven gear (17) are arranged at the lower part of the recovery frame (27), and the sun gear (16) and the driven gear (17) are respectively in contact with the upper surface and the side surface of the track arranged on the ground; a scraper is arranged on the top of the recovery frame (27) and matched with the material collecting plate (28).
9. The natural gas fired magnesite calciner of claim 1, wherein: The feeding channel (21) is externally provided with a cutting oblique feeding trolley track (31), the feeding trolley track (31) is matched with a feeding trolley (32) in sliding connection, one end of a turnover connecting rod (33) is connected to the feeding trolley (32) through a rotating shaft, the other end of the turnover connecting rod (33) is connected with a traction rope (34); a transition platform (35) is arranged at the top of the feeding trolley track (31), a guide wheel (36) is arranged at the top of the feeding trolley track (31), the traction rope (34) is connected with an external power device through the guide wheel (36); the feeding trolley (32) is pulled to the transition platform (35), and the material in the feeding trolley (32) enters the feeding channel (21).