Double-chambered powder flying furnace

Abstract

The application discloses a double regenerator type powder flying melting furnace, which can be widely used in the chemical field of glass production, iron smelting, non-ferrous metal smelting, solid fuel gasification and the like. The melting furnace has two regenerators which are used for preheating oxygen-containing gas and cooling high-temperature gas product alternately. Two melting furnaces are required to feed alternately. The inner wall of the feeding port of the two melting furnaces is often bonded by molten material condensation, and the feeding port is blocked, thereby affecting the smooth feeding of raw materials and greatly influencing production. The application can better solve the above problems through various technical schemes, such as setting a purge gas input port on a common feeding pipeline or a raw material feeding pipeline, setting a forced feeding device on the feeding port and setting the raw material feeding pipeline as a movable feeding pipeline.

Description

Technical Field

[0001] This invention belongs to the field of chemical industry, specifically relating to a double regenerative furnace that melts powdered raw materials (or the ash content of powdered solid fuel) at high temperatures in flight. This furnace can be widely used in the production of glass, iron smelting, non-ferrous metal smelting, solid fuel gasification, etc. Background Technology

[0002] In the production of glass, iron smelting, non-ferrous metal smelting, and solid fuel gasification, reactions need to be carried out in high-temperature furnaces. Powdered raw materials (or powdered solid fuels) are dispersed in high-temperature gases for high-temperature reactions, resulting in rapid heat and mass transfer and reduced energy consumption and production costs. US Patent No. 8747524B2 discloses a melting furnace that allows powdered raw materials such as glass raw materials, iron smelting raw materials, non-ferrous metal production raw materials, and solid fuels to undergo high-temperature reactions in a flight state, recovering the waste heat generated during the high-temperature reaction. This melting furnace requires two regenerators to be used alternately for preheating oxygen-containing gas and cooling high-temperature gaseous products. Two furnaces are used for alternating feeding. Molten material often condenses and adheres to the inner walls of the feed inlets of both furnaces, clogging the feed inlets and affecting the smooth feeding of raw materials. When feeding is not smooth, the amount of raw material fed is reduced, output decreases, and the stability of the melting furnace operation is affected; severe clogging prevents feeding altogether, necessitating furnace shutdown for maintenance and causing significant economic losses. Summary of the Invention

[0003] To solve the above problems, the inventors carefully studied and discovered that: the use of the regenerator requires reversing the flow every certain period of time. Each reversal changes the airflow direction in the furnace and the regenerator to the opposite direction to the previous direction, allowing the two regenerators to be used alternately for preheating oxygen-containing gas and cooling high-temperature gaseous products. The two furnaces need to be fed alternately. The furnace connected to the regenerator for preheating oxygen-containing gas is in the feeding state. In the furnace chamber of this furnace, the fuel (when used for solid fuel gasification, this fuel is the powdered solid fuel that is fed into the furnace chamber from the feed port; all content in parentheses in this paragraph below refers to the case when used for solid fuel gasification) is rapidly mixed and burned with the preheated oxygen-containing gas, reaching a melting temperature above the powdered raw material (or the ash content contained in the powdered solid fuel). Typically, a temperature above 1450°C is required for glass production, iron smelting, and solid fuel gasification, and a temperature above 1350°C is required for flash copper smelting of copper concentrate. Powdered raw materials (or powdered solid fuels) are dispersed in high-temperature gas, in a state of flight, resulting in very high heat and mass transfer efficiency. The ash content of the powdered raw materials (or powdered solid fuels) rapidly melts into liquid molten dust. This liquid molten dust flows through the furnace chamber with the high-temperature gas, washing over the furnace walls. Most of it adheres to the furnace walls. Under gravity, the liquid molten dust flows downwards to the drain outlet near the bottom of the furnace. Although the high-temperature gas exiting the exhaust port of this furnace still carries a small amount of molten dust, it then enters a second furnace. This second furnace is in a stopped-feeding state. The small amount of molten dust carried by the high-temperature gas adheres to the furnace walls of the second furnace for purification and separation. The purified high-temperature gas is then input into a regenerator used to cool the high-temperature gas products and recover heat. Because... When powdered raw materials (or powdered solid fuel) enter a furnace connected to a regenerator containing preheated oxygen gas, a small amount adheres to the inner wall of the furnace's feed inlet. When the flow direction is reversed, the feed inlet of this furnace stops feeding. The high-temperature gas entering this furnace from another furnace heats the inner wall of the feed inlet, causing the powdered raw materials (or ash from the powdered solid fuel) adhering to the inner wall to melt and stick to the inner wall. When the flow direction is reversed again and the feed inlet resumes feeding, the newly arriving powdered raw materials (or powdered solid fuel) will adhere to the molten material adhering to the inner wall of the feed inlet, lowering the temperature of the inner wall and causing the adhering molten material to cool and solidify. Thus, with repeated reversals, repeated adhesion and solidification occur, and the adhering material accumulates, causing blockage.

[0004] To solve the above problems, the inventors, through repeated research and experimentation, obtained a new solution:

[0005] A dual-regenerative-chamber type powder flying furnace includes two furnaces, a raw material feeding device, and an oxygen-containing gas preheating system. The oxygen-containing gas preheating system includes two regenerative chambers, two inlet reversing gates, two exhaust reversing gates, an oxygen-containing gas input device, and an exhaust device. One of the two regenerative chambers is used to preheat the oxygen-containing gas, while the other is used to cool the high-temperature gaseous product. The regenerative chamber used to preheat the oxygen-containing gas has a gas inlet and a preheated gas outlet, and the regenerative chamber used to cool the high-temperature gaseous product has a high-temperature gas inlet and a cooling gas outlet.

[0006] The connection method of each component included in the above-mentioned oxygen-containing gas preheating system is as follows: the oxygen-containing gas input device is connected to the gas inlet through an open intake reversing gate and to the cooling gas outlet through another closed intake reversing gate; the exhaust device is connected to the cooling gas outlet through an open exhaust reversing gate and to the gas inlet through another closed exhaust reversing gate.

[0007] The aforementioned furnace includes a feed reversing gate, a raw material feeding pipe, an air inlet, an air outlet, and a feed port. The raw material feeding pipe of the furnace includes an outlet end and an inlet end, with its outlet end connected to the feed port of the furnace and its inlet end connected to the feed reversing gate of the furnace. The feed reversing gates of the two furnaces are respectively connected to the raw material feeding equipment through a common feed pipe. The preheating gas outlet is connected to the air inlet of one furnace, the feed reversing gate of that furnace is in an open state, the air outlet of that furnace is connected to the air inlet of another furnace through an airflow channel, the feed reversing gate of the other furnace is in a closed state, and the air outlet of the other furnace is connected to the high-temperature gas inlet. A purging gas inlet is provided on the common feed pipe.

[0008] Compared with existing technologies, the purging gas in the above solution purifies the inner wall of the feed inlet, preventing powdery raw materials from adhering to the inner wall of the feed inlet and avoiding the formation of molten material adhesion, thus preventing blockage.

[0009] The inventors discovered that, ideally, after the molten dust carried by the high-temperature gas is purified and separated in the furnace chambers of two furnaces, the high-temperature gas becomes very clean before being input into the regenerator used to cool the high-temperature gas products and recover heat. Under these conditions, the above-mentioned technical solution can effectively solve the problem of feed inlet blockage. However, this ideal state is sometimes not achieved; not all molten dust is completely separated. A very small amount of molten dust, which is difficult to completely separate, flies into the feed inlet of the second furnace, which is in a stopped feeding state, and adheres to the inner wall of the feed inlet. After a relatively long period of accumulation, it will still cause feed inlet blockage.

[0010] To solve the above problems, the inventors, through repeated research and experimentation, obtained a second new solution:

[0011] A dual-regenerative-chamber type powder flying furnace includes two furnaces and an oxygen-containing gas preheating system. The components and connection methods of the oxygen-containing gas preheating system are the same as those of the previous scheme, but the difference lies in:

[0012] The furnace includes a raw material feeding device, an air inlet, an air outlet, a feed inlet, and a raw material feeding pipe. The raw material feeding pipe of the furnace includes an outlet end and an inlet end. Its outlet end is connected to the feed inlet of the furnace, and its inlet end is connected to the raw material feeding device of the furnace. The preheating gas outlet is connected to the air inlet of one furnace. The raw material feeding device of the furnace is in the starting feeding state. The air outlet of the furnace is connected to the air inlet of another furnace through an airflow channel. The raw material feeding device of the other furnace is in the stopping feeding state. The air outlet of the other furnace is connected to the high-temperature gas inlet. A purging gas inlet is provided on the raw material feeding pipe.

[0013] Because purge gas inlets are installed on the raw material feed pipes of both furnaces, when the raw material feeding equipment of the other furnace is in a stopped feeding state, purge gas is still introduced into the furnace from the feed inlet of that furnace. This prevents high-temperature molten dust that has not been completely purified by the furnace from flying into the feed inlet, thus avoiding the high-temperature molten dust from sticking to the inner wall of the feed inlet and causing blockage. It can also cool the inner wall of the feed inlet, preventing the inner wall of the feed inlet from heating up to the melting temperature of the powdered raw materials (or the ash contained in the powdered solid fuel).

[0014] To solve the above problems, the inventors, through repeated research and experimentation, obtained a third new solution:

[0015] A dual-regenerative-chamber type powder flying furnace includes two furnaces and an oxygen-containing gas preheating system. The components and connection methods of the oxygen-containing gas preheating system are the same as those of the previous scheme, but the difference lies in:

[0016] The furnace includes a raw material feeding device, an air inlet, an air outlet, a feed inlet, and a raw material feeding pipe. The raw material feeding pipe of the furnace includes an outlet end and an inlet end. Its outlet end is connected to the feed inlet of the furnace, and its inlet end is connected to the raw material feeding device of the furnace. The preheating gas outlet is connected to the air inlet of one furnace. The raw material feeding device of the furnace is in the starting feeding state. The air outlet of the furnace is connected to the air inlet of another furnace through an airflow channel. The raw material feeding device of the other furnace is in the stopping feeding state, and the air outlet of the other furnace is connected to the high-temperature gas inlet. There is a forced feeding device on the feed inlet. The forced feeding device is a device that uses mechanical thrust to push powdered raw materials from the raw material feeding pipe into the feed inlet.

[0017] To solve the above problems, the inventors, through repeated research and experimentation, obtained a fourth new solution:

[0018] A dual-regenerative-chamber type powder flying furnace includes two furnaces and an oxygen-containing gas preheating system. The components and connection methods of the oxygen-containing gas preheating system are the same as those of the previous scheme, but the difference lies in:

[0019] The furnace includes a raw material feeding device, a raw material feeding pipe, an air inlet, an air outlet, and a feed inlet; the raw material feeding pipe is a movable feeding pipe, and the outlet end of the movable feeding pipe is movably connected to the feed inlet; the preheating gas outlet is connected to the air inlet of one furnace, the feed inlet of the furnace is connected to the raw material feeding device through the movable feeding pipe, the air outlet of the furnace is connected to the air inlet of another furnace through an airflow channel, and the air outlet of the other furnace is connected to the high-temperature gas inlet; the feed inlet of the other furnace is disconnected from the outlet end of the movable feeding pipe. Attached Figure Description

[0020] The following detailed description, in conjunction with the accompanying drawings and specific embodiments, illustrates the dual regenerable chamber type powder flying furnace of the present invention and its beneficial technical effects.

[0021] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present invention.

[0022] Figure 2 schematically shown Figure 1 Details of the area represented by the dashed circle 24.

[0023] Figure 3 schematically shown Figure 1 Details of the area indicated by the dashed circle 25.

[0024] Figure 4 This is a partial structural schematic diagram of the second embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the structure of the third embodiment of the present invention.

[0026] Figure 6 schematically shown Figure 5 Details of the area indicated by the dashed circle 30.

[0027] Figure 7 This is a partial structural schematic diagram of the fourth embodiment of the present invention.

[0028] Figure 8 This is a schematic diagram of the structure of the fifth embodiment of the present invention.

[0029] Figure 9 schematically shown Figure 8 Details of the area represented by the dashed circle 41.

[0030] Figure 10schematically shown Figure 8 Details of the area indicated by the dashed circle 42.

[0031] Figure 11 This is a partial structural schematic diagram of the sixth embodiment of the present invention.

[0032] Figure 12 , 13 This is a partial structural schematic diagram of the seventh embodiment of the present invention.

[0033] Figure 14 , 15 This is a partial structural schematic diagram of the eighth embodiment of the present invention.

[0034] Figure 16 This is a schematic diagram of the structure of the ninth embodiment of the present invention. Detailed Implementation

[0035] Example 1

[0036] See Figure 1 , Figure 1 For details of the areas indicated by the dashed circles 24 and 25, please refer to the following: Figure 2 , 3 . Figure 1 The image shows a dual-regenerative-chamber type powder flying furnace, which includes two furnaces, a raw material feeding device 1, and an oxygen-containing gas preheating system. The oxygen-containing gas preheating system includes two regenerative chambers 3, two inlet reversing gates 4, two exhaust reversing gates 5, an oxygen-containing gas input device 6, and an exhaust device 7. One of the two regenerative chambers 3 is used to preheat the oxygen-containing gas, while the other is used to cool the high-temperature gaseous products. The regenerative chamber 3 used to preheat the oxygen-containing gas has a gas inlet 18 and a preheated gas outlet 19, and the regenerative chamber 3 used to cool the high-temperature gaseous products has a high-temperature gas inlet 20 and a cooling gas outlet 21.

[0037] The connection method of each component of the above-mentioned oxygen-containing gas preheating system has the following characteristics: the oxygen-containing gas input device 6 is connected through an air intake reversing gate 4 that is in an open state. Figure 1 The right-side intake reversing gate 4 is connected to the gas inlet 18, and is also connected to another intake reversing gate 4 that is in a closed state. Figure 1 The left-side intake reversing gate 4) is connected to the cooling air outlet 21; the exhaust device 7 is connected to an open exhaust reversing gate 5. Figure 1 The exhaust reversing gate 5 on the left is connected to the cooling gas outlet 21, and is also connected to another exhaust reversing gate 5 that is in a closed state. Figure 1 The exhaust reversing gate 5 on the right is connected to the gas inlet 18.

[0038] The aforementioned furnace includes a feed reversing gate 8, a raw material feeding pipe 9, an air inlet 10, an air outlet 12, and a feed inlet 13; the raw material feeding pipe 9 of the furnace includes an outlet end 15 and an inlet end 16, with the outlet end 15 connected to the feed inlet 13 of the furnace and the inlet end 16 connected to the feed reversing gate 8 of the furnace; the feed reversing gates 8 of the two furnaces are respectively connected to the raw material feeding device 1 through a common feeding pipe 17; the preheating gas outlet 19 is connected to the air inlet 10 of one furnace, and the feed reversing gate 8 of the furnace ( Figure 2 The feed reversing gate 8 on the right is in the open state. The gas outlet 12 of this furnace is connected to the gas inlet 10 of another furnace through the airflow channel 22. The feed reversing gate 8 of the other furnace is in the open state. Figure 2 The feed reversing gate 8 on the left is closed, and the gas outlet 12 of the other furnace is connected to the high-temperature gas inlet 20; a purging gas inlet 23 is provided on the common feed pipeline 17.

[0039] The aforementioned intake reversing gate 4 and exhaust reversing gate 5 are used for reversing operations. When one intake reversing gate 4 and one exhaust reversing gate 5 are in the open state, the other intake reversing gate 4 and the other exhaust reversing gate 5 are in the closed state. Every certain period of time, the intake reversing gate 4 and the exhaust reversing gate 5 reverse once. The intake reversing gate 4 and the exhaust reversing gate 5 that were in the open state before the reversal are in the closed state after the reversal, and the intake reversing gate 4 and the exhaust reversing gate 5 that were in the closed state before the reversal are in the open state after the reversal. The feed reversing gate 8 that was in the open state before the reversal becomes the closed state after the reversal, and the feed reversing gate 8 that was in the closed state before the reversal becomes the open state after the reversal.

[0040] The above reversing operation is generally performed once every 10 to 60 minutes.

[0041] Compared with the prior art, in Example 1, because a purging gas inlet 23 is provided on the common feeding pipe 17, the purging gas mixes with the powdered raw material input from the raw material feeding device 1 and is sequentially input into the furnace 11 through the open feeding reversing gate 8 and its connected raw material feeding pipe 9 and inlet 13. The purging gas purges the inner wall 29 of the inlet 13, preventing the powdered raw material from adhering to the inner wall 29 of the inlet 13. After the feeding reversing gate 8 connected to the raw material feeding pipe 9 is closed, no raw material or purging gas is input into the furnace 11 through the raw material feeding pipe 9 (e.g., ...). Figure 3 As shown), the high-temperature gas in the furnace 11 will heat the temperature of the inner wall 29 of the feed inlet 13 to above the melting temperature of the powdered raw material (or the ash contained in the powdered solid fuel). However, due to the above-mentioned purging effect, no powdered raw material sticks to the inner wall 29 of the feed inlet 13, and no molten material will be formed, thus avoiding blockage.

[0042] Example 2

[0043] See Figure 1 , 4 ,Will Figure 1 The area represented by the dashed circle 24 is... Figure 4 The area represented by the dashed circle 26 is replaced to form a double regenerator type powder flying furnace, which is basically the same as the structure of Example 1. The difference is that the purging gas inlet 23 set on the common feed pipe 17 is connected to the purging gas inlet 27; and a valve 28 is installed on the purging gas inlet 27.

[0044] Example 3

[0045] See Figure 5 , Figure 5 For details of the area indicated by the dashed circle 30, please refer to [link / reference]. Figure 6 . Figure 5 The image shows a dual-regenerative-chamber type powder flying furnace, which includes two furnaces and the same oxygen-containing gas preheating system as in Example 1, except that:

[0046] The furnace includes a raw material feeding device 1, an air inlet 10, an air outlet 12, a feed inlet 13, and a raw material feeding pipe 9. The raw material feeding pipe 9 includes an outlet end 15 and an inlet end 16. The outlet end 15 is connected to the feed inlet 13 of the furnace, and the inlet end 16 is connected to the raw material feeding device 1 of the furnace. The preheating gas outlet 19 is connected to the air inlet 10 of one furnace. The raw material feeding device 1 of the furnace is in the starting feeding state. The air outlet 12 of the furnace is connected to the air inlet 10 of another furnace through an airflow channel 22. The raw material feeding device 1 of the other furnace is in the stopping feeding state. The air outlet 12 of the other furnace is connected to the high-temperature gas inlet 20. A purging gas inlet 23 is provided on the raw material feeding pipe 9.

[0047] Example 4

[0048] See Figure 5 , 7 The area represented by the dashed circle 30 in section 5 is... Figure 7 The area represented by the dashed circle 31 is replaced to form a double regenerator type powder flying furnace, which is basically the same as the structure of Example 3. The difference is that the purge gas inlet 23 set on the raw material feed pipe 9 is connected to the purge gas inlet pipe 27; the purge gas inlet pipe 27 is equipped with a valve 28.

[0049] The valve 28 installed on the purge gas input pipe 27 can open or close the purge gas, and can also adjust the purge gas volume to achieve a more appropriate volume, so as to avoid the inner wall 29 of the feed inlet 13 not being cleaned when the volume is too low; it can also avoid the situation of waste due to excessive purge gas volume; the purge gas is not preheated and the temperature is relatively low, and excessive volume will also reduce the furnace temperature.

[0050] The feed inlet 13, when feeding is stopped, does not require a high airflow velocity to prevent molten dust from flying in; the purge air volume can be reduced using valve 28. The feed inlet 13, when feeding, does not need continuous purge air input; simply open valve 28 before switching to purge the powder adhering to the inner wall 29 of the feed inlet. Generally, 3-5 seconds of purging is sufficient before closing valve 28. For the scheme in Example 2, valve 28 also needs to be opened after switching to purge the feed inlet 13, which is about to begin feeding, to cool its inner wall 29 below the melting temperature of the powdered raw material (or the ash content of the powdered solid fuel), before starting the raw material feeding device 1. This prevents newly arriving powdered raw material from adhering to the hot inner wall 29 and melting and sticking. Generally, 5-10 seconds of purging is sufficient before closing valve 28. When applying the above technical solution to glass production, in order to reduce the amount of purging air used, the operators consistently used the above operating method, without continuously inputting purging air into the feeding inlet 13. However, on one occasion, due to a malfunction in valve 28 that prevented it from closing, purging air had to be continuously input into the feeding inlet 13. Production continued under these circumstances for two days, and the inventors found in the production statistics reports that the glass product qualification rate increased by 2.7% during these two days. After two months of repeated comparative experiments, the inventors discovered that continuously inputting purging air into the raw material feeding pipe 9, compared to the above operating method, could increase the glass product qualification rate by 3.6%.

[0051] Through comparative experiments, the inventors found that when the above-described embodiments are applied to iron smelting, copper smelting, or solid fuel gasification, continuously feeding purging gas into the feed inlet 13 reduces raw material consumption compared to the above-described operating methods. Specific details are as follows:

[0052] In ironmaking, the amount of raw materials consumed per ton of iron produced can be reduced by 3.2%.

[0053] In copper smelting, the amount of raw materials consumed to produce one ton of copper can be reduced by 2.7%.

[0054] When solid fuels are gasified, the amount of solid fuel consumed to produce each cubic meter of gas can be reduced by 2.6%.

[0055] Through careful research, the inventors discovered that, due to the stickiness of the powdered raw materials, if purging air is not introduced into the feed inlet 13, some of the powdered raw materials entering the furnace through the feed inlet 13 will clump together. After the clumps enter the furnace, some of them do not have time to be dispersed by the high-temperature airflow inside the furnace, and the surface layer of the powder clumps melts rapidly, forming powder clumps coated with a layer of molten liquid. These powder clumps coated with molten liquid are even more difficult to disperse in the airflow inside the furnace. The reaction rate of the powder inside these powder clumps with the external high-temperature airflow is very slow, resulting in the following adverse effects:

[0056] In glass production, the powdered raw material is usually glass raw material in powder form. When this powdered glass raw material is encased in molten liquid, the powder inside may not melt completely, resulting in incompletely melted particles that are discharged from the furnace. In the final formed flat glass or bottle / jar glass products, this creates inclusion defects, making the product substandard.

[0057] During iron smelting, the powdered raw materials include iron ore powder and powdered flux minerals, typically limestone. The high-temperature gas inside the furnace 11 is a high-temperature reducing gas containing CO and H2, which fully disperses the powdered raw materials within it. This results in very high heat and mass transfer efficiency, causing the raw materials to rapidly melt into a liquid state and precipitate as liquid iron and molten slag, which are then discharged from the drain port 2. However, the reaction rate between the iron ore powder inside this powdery mass enveloped by the molten liquid and the external high-temperature reducing gas is very slow. The iron contained within cannot be fully reduced and refined in time, and thus becomes slag discharged from the furnace.

[0058] In copper smelting, the powdered raw materials include copper sulfide concentrate powder and powdered flux. The powdered raw materials are fully dispersed in the high-temperature gas within the furnace. Oxidation, desulfurization, melting, and slag formation reactions can be completed in just 2-3 seconds, forming copper matte and slag, which are then discharged from drain port 2. However, the reaction rate between the copper sulfide concentrate inside this powdery mass encased in molten liquid and the external high-temperature gas is very slow. It does not have enough time to fully react and form copper matte, instead becoming slag and being discharged from drain port 2.

[0059] During solid fuel gasification, the powdered raw materials (or powdered solid fuels) typically include pulverized coal and powdered biomass fuel. The ash contained in the surface layer of the solid fuel powder agglomerates that are not blown apart melts rapidly in the high-temperature furnace, forming agglomerates encased in a layer of molten liquid. The solid fuel inside the agglomerates does not have enough time to be fully gasified into high-temperature fuel gas and is discharged from the furnace along with the molten ash.

[0060] If purge air is continuously supplied to the feed inlet 13, the purge air impacts and disperses the powder clumps when it enters the raw material feed pipe 9, allowing the powdered raw material to be fully dispersed in the high-temperature gas flow within the furnace. The fine powder particles come into full contact with the high-temperature gas flow, resulting in rapid heat and mass transfer. The aforementioned processes, such as glass production, iron smelting, copper smelting, or solid fuel gasification, can achieve the following more complete reactions:

[0061] During glass production, the fine glass raw material powder particles come into full contact with the high-temperature airflow, allowing for a full melting reaction to form qualified glass liquid. This avoids inclusion defects caused by powder agglomeration and improves the product qualification rate.

[0062] During ironmaking, the fine iron powder particles come into full contact with the high-temperature reducing gas flow, and the reaction speed is very fast. This can fully reduce and extract the iron from the raw materials, avoiding the waste of raw materials caused by powder agglomeration.

[0063] During copper smelting, the fine copper powder particles come into full contact with the high-temperature airflow, and the reaction speed is very fast. The copper sulfide concentrate can fully undergo oxidation, desulfurization, melting, slag formation and other reactions, so that the copper contained in the copper sulfide concentrate can be fully converted into copper matte, so as to avoid it becoming slag and wasting raw materials.

[0064] During solid fuel gasification, the fine powdered solid fuel particles come into full contact with the high-temperature oxygen-containing gas, and the reaction speed is very fast. This allows for the full gasification of the solid fuel into high-temperature fuel containing CO and H2, thus avoiding fuel waste caused by the agglomeration of powdered solid fuel.

[0065] Therefore, it can be seen that continuously supplying purge gas to the feed inlet 13 during feeding can fully disperse the powdered raw materials in the high-temperature gas flow in the furnace, resulting in a more complete high-temperature reaction and achieving unexpected technical effects. Therefore, the present invention preferably continuously supplies purge gas to the feed inlet 13 during feeding.

[0066] In the above embodiment, purge gas can be input by connecting a purge gas input device to the purge gas input port 23. The purge gas can be oxygen-containing gas or nitrogen. The oxygen-containing gas includes air or oxygen-enriched air.

[0067] Using air as purging gas is relatively easy to obtain; simply connect a blower to the purging gas inlet 23. Compressed air can also be used. If the furnace pressure in the furnace 11 is controlled to an appropriate negative pressure value (equivalent to the pressure inside the furnace 11 being less than the external pressure with a suitable pressure difference), simply opening an opening in the raw material feed pipe 9 or the common feed pipe 17 can be used as a purging gas input device to draw in outside air, thus achieving the function of purging gas, which is very convenient.

[0068] When using Examples 3 or 4 in ironmaking, using oxygen-containing gas as the purge gas allows the high-temperature reducing waste gas to mix and burn with the purge gas before entering the regenerator 3 used to cool the high-temperature gas products. In Example 4, simply adjusting the valve 28 on the purge gas input pipe 27 allows for the adjustment of the appropriate amount of oxygen-containing gas input, ensuring complete combustion of the high-temperature reducing waste gas and thus fully utilizing its chemical energy.

[0069] Example 5

[0070] See Figure 8 , Figure 8 For details of the areas indicated by the dashed circles 41 and 42, please refer to the following: Figure 9 , 10 . Figure 8 The image shows a dual-regenerative-chamber type powder flying furnace, which includes two furnaces and the same oxygen-containing gas preheating system as in Example 1, except that:

[0071] The furnace includes a raw material feeding device 1, an air inlet 10, an air outlet 12, a feed inlet 13, and a raw material feeding pipe 9. The raw material feeding pipe 9 includes an outlet end 15 and an inlet end 16. The outlet end 15 is connected to the feed inlet 13 of the furnace, and the inlet end 16 is connected to the raw material feeding device 1 of the furnace. The preheating gas outlet 19 is connected to the air inlet 10 of one furnace. The raw material feeding device 1 of the furnace is in the starting feeding state. The air outlet 12 of the furnace is connected to the air inlet 10 of another furnace through an airflow channel 22. The raw material feeding device 1 of the other furnace is in the stopping feeding state. The air outlet 12 of the other furnace is connected to the high-temperature gas inlet 20. A forced feeding device is provided on the feed inlet 13.

[0072] The forced feeding device includes a push rod 35, a rod cavity 36, a piston 37, and a drive mechanism 38 for pushing the piston 37 to reciprocate. The rod cavity 36 is connected to the inlet end 16 of the raw material feeding pipe 9, and the outer diameter of the push rod 35 is adapted to the inner diameter of the raw material feeding pipe 9. The push rod 35 includes a tail end 39 and a top end 40. The tail end 39 of the push rod 35 is connected to the piston 37, and the top end 40 of the push rod 35 is pushed by the piston 37 to the retraction endpoint of the reciprocating motion and then retracts into the rod cavity 36 (e.g., when the piston 37 pushes the top end 40 of the push rod 35 to the retraction endpoint position). Figure 10 As shown), when it reaches the end position of the reciprocating motion propulsion, it reaches the feed inlet 13 (as shown). Figure 9 (As shown); when the tail end 39 of the push rod 35 is pushed by the piston 37 to the end position of the reciprocating motion, it is located in the rod cavity 36.

[0073] The aforementioned forced feeding device is a device that uses mechanical thrust to push powdered raw materials from the raw material feeding pipe into the feed port 13. The push rod 35 can perform continuous reciprocating motion, forcibly pushing the powdered raw materials that enter the raw material feeding pipe 9 from the inlet end 16 into the feed port 13.

[0074] When molten material is present on the inner wall 29 of the feed inlet 13, it will solidify and adhere, becoming extremely strong and difficult to remove, eventually accumulating and causing blockage. The pusher 35 can continuously and forcefully push the powdered raw material and molten material together from the feed inlet 13 into the furnace 11, promptly removing any small amount of molten material adhering to the inner wall 29, thus preventing the problem of molten material solidifying, adhering, and causing blockage.

[0075] Example 6

[0076] See Figure 5 , 11 ,Will Figure 5 The area represented by the dashed circle 30 is... Figure 11 The area represented by the dashed circle 70 is replaced to form a double regenerator type powder flying furnace, which is basically the same as that in Example 5, except that its forced feeding device is different from that in Example 5. Its forced feeding device includes a spring-shaped spiral blade 67 and a mechanically driven rotating shaft 68; the spiral blade 67 is located in the raw material feed pipe 9, and the shaft 68 is located on the center line of the spiral blade 67, and the shaft 68 is fixedly connected to the spiral blade 67.

[0077] The mechanism that drives the shaft 68 to rotate is a motor 69, and the shaft 68 is connected to the motor 69.

[0078] The aforementioned forced feeding device is also a device that uses mechanical thrust to push powdered raw materials from the raw material feeding pipe into the feed port 13. The rotation direction of the shaft 68 causes the spiral blades 67 to push the powdered raw materials toward the feed port 13. When there is molten material on the inner wall 29 of the feed port 13, the spiral blades 67 will force the powdered raw materials and molten material together into the furnace 11, which can avoid blockage.

[0079] Example 7

[0080] See Figure 8 , 12 13, will Figure 8 The areas represented by dashed circles 41 and 42 are respectively... Figure 12 , 13 The areas represented by the dashed circles 53 and 54 are replaced to form a dual-regenerative-chamber type powder flying furnace, which includes two furnaces and the same oxygen-containing gas preheating system as in Example 1, except that:

[0081] The furnace includes a raw material feeding device 1, a raw material feeding pipe, an air inlet 10, an air outlet 12, and a feed inlet 13. The raw material feeding pipe is a movable feed pipe 43, and the outlet end 44 of the movable feed pipe 43 is movably connected to the feed inlet 13. The preheating gas outlet 19 is connected to the air inlet 10 of one furnace. The feed inlet 13 of the furnace is connected to the raw material feeding device 1 through the movable feed pipe 43. The air outlet 12 of the furnace is connected to the air inlet 10 of another furnace through an airflow channel 22. The air outlet 12 of the other furnace is connected to the high-temperature gas inlet 20. The feed inlet 13 of the other furnace is disconnected from the outlet end 44 of the movable feed pipe 43.

[0082] The movable feed pipe 43 includes a fixed pipe 47, a movable pipe 46, a gate 48, a piston 49, and a drive mechanism 50 for pushing the piston 49 to reciprocate. The fixed pipe 47 includes an inlet end 45 and an outlet 52. The inlet end 45 is connected to the raw material feeding device 1. The movable pipe 46 includes an inlet 51 and an outlet end 44. The gate 48 is fixedly connected to the outside of the inlet 51 of the movable pipe 46. The piston 49 is connected to the movable pipe 46. When the movable pipe 46 is pushed by the piston 49 to the end position of the reciprocating motion, the outlet end 44 is connected to the feed inlet 13 (e.g., ...). Figure 13 As shown), inlet 51 is connected to outlet 52; when the moving tube 46 is pushed by piston 49 to the retraction endpoint of the reciprocating motion, outlet end 44 is disconnected from inlet 13 (as shown). Figure 12 As shown), the inlet 51 is disconnected from the outlet 52, and the gate 48 covers the outlet 52.

[0083] Because it is difficult to determine the extent of blockage without continuously disconnecting the feed inlet 13 from the raw material feed pipe 9, in this embodiment, the operator can disconnect the feed inlet 13 (which has stopped feeding) from the movable feed pipe 43 at any time to check whether there is molten material condensing and adhering on the inner wall 29 of the feed inlet 13. This allows the operator to use conventional tools such as an electric drill, wire brush, or grinding wheel to clean the material adhering to the inner wall 29, preventing blockage caused by the increasing amount of material adhering to the wall. However, the disadvantage is that after disconnection, the feed inlet 13 is open to the outside, causing heat loss from the furnace; when the pressure inside the furnace is greater than the outside pressure, it can also cause high-temperature gas to leak out. Therefore, when disconnecting, the pressure inside the furnace should be adjusted to be slightly lower than the outside pressure.

[0084] Example 8

[0085] Figure 14 , 15 This schematically illustrates a movable feed pipe and a gate. The areas represented by dashed circles 41 and 42 in section 8 are respectively... Figure 14 , 15The areas represented by the dashed circles 65 and 66 are replaced to form a double regenerator type powder flying furnace, which is basically the same as the structure of Example 7. The difference is that a gate 32 is provided on its feed inlet 13, and it also has a movable feed pipe 43 with a different structural type than that of Example 7.

[0086] See Figure 14 , 15 The movable feed pipe 43 includes an inner pipe 55, an outer pipe 56, an outlet end 44, an inlet end 45, a cross arm 57, a piston 58, and a drive mechanism 59 for reciprocating motion of the piston 58; the inlet end 45 is connected to the raw material feeding device 1; one end of the cross arm 57 is connected to the outer pipe 56, and the other end is connected to the piston 58; the outer pipe 56 is sleeved on the inner pipe 55, and there is an oil seal 60 in the gap between the two; when the outer pipe 56 is pushed to the end position of the reciprocating motion by the piston 58 and the cross arm 57, the outlet end 44 is disconnected from the feed inlet 13 and moves away from the feed inlet 13 (e.g., ...). Figure 14 As shown), when pushed to the reciprocating end position by piston 58 and horizontal arm 57, outlet end 44 connects to inlet 13 (as shown). Figure 15 (As shown). The gate 32 includes a gate plate 61, a cross arm 62, a piston 63, and a drive mechanism 64 for pushing the piston 63 to reciprocate; one end of the cross arm 62 is connected to the gate plate 61, and the other end is connected to the piston 63; when the gate plate 61 is pushed to the end position of the reciprocating motion by the piston 63 and the cross arm 62, the gate plate 61 covers the feed inlet 13; when the gate plate 61 is pushed to the end position of the reciprocating motion by the piston 63 and the cross arm 62, the gate plate 61 leaves the feed inlet 13.

[0087] The gate 32 on the feed inlet 13, which is connected to the movable feed pipe 43, is in the open state (e.g., Figure 15 As shown), this allows the raw materials to enter the furnace smoothly; the gate 32 on the feed inlet 13, which is disconnected from the outlet end 44 of the movable feed pipe 43, is in a closed state (as shown). Figure 14 As shown in the figure, to prevent the high-temperature gas inside the furnace from leaking out, the operator can easily open the gate 32, check or clean the material adhering to the inner wall 29 of the feed inlet, and then close it.

[0088] In the above embodiments, the airflow channel 22 can be replaced by an adhesion separator disclosed in US Patent No. US8747524B2. This adhesion separator has an inlet and an outlet, allowing high-temperature gas carrying molten dust to enter through the inlet and purified high-temperature gas to exit through the outlet. Therefore, the adhesion separator essentially has the function of allowing high-temperature airflow to pass through, as is the case with the airflow channel 22, and is thus a type of airflow channel. Using the adhesion separator is very simple, as illustrated in Example 9:

[0089] Example 9

[0090] See Figure 16 , Figure 16 For details of the area indicated by the dashed circle 30, please refer to [link / reference]. Figure 6 . Figure 16 The image shows a dual-regenerative-chamber type powder flying furnace, which is similar to Example 3 ( Figure 5 The structure is basically the same as that of Example 3, except that in this embodiment, the adhesion separator represented by the dashed box 71 is used instead of the airflow channel 22 in Example 3. Figure 16 The adhesion separator 71 includes an air inlet 72 and an air outlet 73. The air inlet 72 is connected to the air outlet 12 of one furnace, and the air outlet 73 is connected to the air inlet 10 of another furnace.

[0091] Figure 16 In this structure, the adhesion separator 71 and the two furnaces form a series structure, which can more thoroughly purify the molten dust in the high-temperature gas and better prevent molten dust from entering the feed inlet when it is in a stopped feeding state, thus avoiding or reducing blockage.

[0092] In the above embodiments, the exhaust device 7 can be an induced draft fan or a chimney (a chimney cannot be used when gasifying solid fuel), and the oxygen-containing gas input device 6 can be a blower. By adjusting the difference between the suction force of the exhaust device 7 and the pressure of the oxygen-containing gas input device 6, the furnace pressure can be controlled to any value from negative pressure to positive pressure. When the exhaust device 7 is an induced draft fan or a chimney, an air inlet can be set up as the oxygen-containing gas input device 6 to input outside air. If the oxygen-containing gas input device 6 is a blower, only one exhaust port (if it is solid fuel gasification, this exhaust port is changed to an exhaust pipe) needs to be set up as the exhaust device 7 to discharge flue gas (the exhaust gas discharged during fuel gasification can be transported to the gas consumption point from the exhaust pipe). The furnace also includes a furnace chamber 11, a furnace wall 14, and the feed inlet 13 and air inlet. 10 and 12 are respectively located on the furnace wall 14; the raw material feeding device 1 is used to feed powdered raw materials into the furnace chamber 11 through the feed inlet 13; the raw material feeding device 1 can be an impeller feeder, screw feeder or other equipment for feeding powdered materials, or other conventional equipment, as long as it can feed the powdered raw materials into the common feeding pipe 17 or the inlet end 16 of the raw material feeding pipe 9; the above-mentioned double regenerator type powder flying furnace also includes a drain port 2, which is located at or near the bottom of the furnace chamber 11. Molten dust adhering to the furnace wall 14 flows to the drain port 2 for output under the action of gravity; the furnace chamber 11 is basically cylindrical, and the air inlet 10 and the air outlet 12 are located near the two ends of the cylindrical furnace chamber 11 and are tangentially connected to it; the feed inlet 13 is basically located at the top center of the cylindrical furnace chamber 11.

[0093] When the above embodiments are used in glass production, iron smelting, and copper smelting, the oxygen-containing gas can be air or oxygen-enriched air, and the fuel can be powdered solid fuel, gaseous fuel, or liquid fuel. If powdered solid fuel or gaseous fuel is used, the powdered solid fuel can be mixed with powdered raw materials and introduced into the furnace through the raw material feed pipe. A gaseous fuel inlet can be opened on the raw material feed pipe for introducing gaseous fuel, which is very convenient. When the above embodiments are used in iron smelting, the powdered solid fuel is usually pulverized coal.

[0094] When the above embodiments are used for solid fuel gasification, the oxygen-containing gas usually also contains a portion of water vapor. If it is necessary to increase the calorific value of the fuel gas, a mixture of oxygen and water vapor can also be used.

[0095] This invention is not limited to the specific embodiments described above. Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make appropriate changes and modifications to the embodiments, which should also fall within the scope of protection claimed by this invention. This specification uses certain specific terms, which are merely for convenience of explanation and do not constitute any limitation on the invention.

Claims

1. A dual-regenerative-chamber type powder flying furnace, comprising two furnaces and an oxygen-containing gas preheating system, wherein the oxygen-containing gas preheating system comprises two regenerative chambers, two inlet reversing gates, two exhaust reversing gates, an oxygen-containing gas input device, and an exhaust device, characterized in that: One of the two regenerator chambers is used to preheat oxygen-containing gas, while the other is used to cool the high-temperature gaseous product. The regenerator chamber for preheating oxygen-containing gas has a gas inlet and a preheated gas outlet, while the regenerator chamber for cooling the high-temperature gaseous product has a high-temperature gas inlet and a cooling gas outlet. The oxygen-containing gas input device is connected to the gas inlet through an open intake reversing gate and to the cooling gas outlet through a closed intake reversing gate. The exhaust device is connected to the cooling gas outlet through an open exhaust reversing gate and to the cooling gas outlet through a closed exhaust reversing gate. An exhaust reversing gate in a closed state is connected to a gas inlet; the furnace includes a raw material feeding device, a raw material feeding pipe, an air inlet, an air outlet, and a feed inlet; the raw material feeding pipe is a movable feeding pipe, and the outlet end of the movable feeding pipe is movably connected to the feed inlet; the preheating gas outlet is connected to the air inlet of one furnace, the feed inlet of the furnace is connected to the raw material feeding device through the movable feeding pipe, the air outlet of the furnace is connected to the air inlet of another furnace through an airflow channel, and the air outlet of the other furnace is connected to a high-temperature gas inlet; the feed inlet includes an inner wall.

2. The dual regenerator type powder flying furnace according to claim 1, characterized in that: The feed inlet of the other furnace is disconnected from the outlet of the movable feed pipe; a gate is installed on the feed inlet.

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