A ternary catalyst drying and calcination production line

Abstract

The present application relates to the field of three-way catalyst processing, and discloses a three-way catalyst drying and roasting production line, including a primary drying furnace, a secondary drying furnace, a roasting furnace and a heat exchanger. The primary drying furnace, the secondary drying furnace and the roasting furnace are arranged in sequence. The primary drying furnace includes a primary drying fresh air inlet and a primary drying waste gas outlet. The secondary drying furnace includes a secondary drying fresh air inlet and a secondary drying waste gas outlet. The roasting furnace includes a roasting fresh air inlet and a roasting waste gas outlet. The hot side inlet of the heat exchanger is connected to the roasting waste gas outlet, the hot side outlet is connected to the waste gas passage, the cold side inlet is connected to the external space, and the cold side outlet is respectively connected to the primary drying fresh air inlet, the secondary drying fresh air inlet and the roasting fresh air inlet. The primary drying waste gas outlet and the secondary drying waste gas outlet are respectively connected to the waste gas passage, which can reduce the energy consumption of the production line and improve the processing efficiency of the production line.

Description

Technical Field

[0001] This application relates to the field of three-way catalyst processing, and particularly to a drying and roasting production line for three-way catalysts. Background Art

[0002] A three-way catalyst is an off-vehicle purification material installed in an automobile exhaust system. It can convert harmful gases such as CO, HC, and NO X emitted from automobile exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. When high-temperature automobile exhaust passes through the three-way catalyst, the three main harmful gases CO, HC, and NO X in the exhaust gas undergo oxidation-reduction chemical reactions under the catalytic action of the catalytic medium at high temperature. Among them, CO undergoes an oxidation reaction with oxygen in the air to be oxidized into colorless and non-toxic carbon dioxide gas; HC is oxidized into water and carbon dioxide at high temperature; NO X is reduced into nitrogen and oxygen. The three harmful gases are converted into harmless gases, purifying the automobile exhaust and improving the emission quality of automobile exhaust, and it has been widely used in automobiles with high emission requirements.

[0003] The three-way catalyst is usually formed by attaching a catalytic medium to a porous carrier. The porous carrier is usually made of porous ceramic materials to form the outer shape of the three-way catalyst. The porous medium is beneficial to increasing the attachment amount of the catalytic medium and increasing the contact area between the catalytic medium and the automobile exhaust, thereby increasing the speed of the oxidation-reduction reaction of harmful gases in the automobile exhaust. The catalytic medium usually uses metal platinum, rhodium, and palladium materials. The catalytic medium is usually added to the porous carrier by spraying and other methods, and the catalytic medium covers the surface of the internal pores of the porous carrier. After drying and sintering treatments, the catalytic medium is firmly attached to the surface of the porous carrier, greatly increasing the contact area between the automobile exhaust and the catalyst.

[0004] In order to improve the drying and sintering efficiency of the three-way catalyst, the drying and sintering processes of the three-way catalyst are usually carried out in an electric heating furnace. Since the water content of the three-way catalyst after spraying the catalytic medium is very high, the water vapor content in the electric heating furnace is also very high, which easily causes damage to the electric heating device. It is necessary to timely discharge the water vapor in the electric heating furnace while heating. In the existing three-way catalyst drying furnace, it is usually necessary to exchange the air in the furnace while heating, which seriously reduces the thermal efficiency of the drying furnace; moreover, during the drying process of the three-way catalyst, it usually needs to be dried in the furnace and cooled and dehumidified after being taken out of the furnace for many times, and the drying efficiency is also low. In the existing three-way catalyst roasting furnace, in order to timely discharge the exhaust gas formed by roasting the catalytic medium, it is also necessary to exchange the air while roasting, resulting in the loss of a large amount of high-temperature gas and affecting the thermal efficiency of the roasting furnace. There is also a three-way catalyst roasting furnace that uses the discharged high-temperature exhaust gas to preheat the fresh air for ventilation, so as to improve the thermal efficiency of the three-way catalyst roasting furnace. However, the exhaust gas discharge volume of the roasting furnace is equal to the fresh air intake volume, which limits the utilization rate of the heat in the high-temperature exhaust gas. Summary of the Invention

[0005] In order to improve the working efficiency of drying and roasting the three-way catalyst and reduce energy consumption, the present application provides a three-way catalyst drying and roasting production line.

[0006] The three-way catalyst drying and roasting production line provided by the present application adopts the following technical solutions:

[0007] A three-way catalyst drying and roasting production line includes a primary drying furnace, a secondary drying furnace, a roasting furnace and a heat exchanger. The primary drying furnace, the secondary drying furnace and the roasting furnace are arranged in sequence. The primary drying furnace includes a primary drying fresh air inlet and a primary drying exhaust gas outlet. The secondary drying furnace includes a secondary drying fresh air inlet and a secondary drying exhaust gas outlet. The roasting furnace includes a roasting fresh air inlet and a roasting exhaust gas outlet. The heat exchanger includes a hot side inlet, a hot side outlet, a cold side inlet and a cold side outlet. The hot side inlet is connected to the roasting exhaust gas outlet. The hot side outlet is connected to an exhaust gas passage. The cold side inlet is connected to the external space, and the cold side outlet is respectively connected to the primary drying fresh air inlet, the secondary drying fresh air inlet and the roasting fresh air inlet. The primary drying exhaust gas outlet and the secondary drying exhaust gas outlet are respectively connected to the exhaust gas passage.

[0008] By adopting the above technical solution, by using the primary drying furnace, secondary drying furnace and roasting furnace arranged in sequence, continuous drying and roasting processing of the ternary catalyst can be carried out, improving the processing efficiency of the ternary catalyst; by using the primary drying fresh air inlet and primary drying waste gas outlet of the primary drying furnace, the high-humidity gas formed by drying the ternary catalyst in the primary drying furnace can be ventilated, reducing the humidity in the primary drying furnace, ensuring the safe use of the primary drying furnace, and promoting the rapid drying of the ternary catalyst; by using the secondary drying fresh air inlet and secondary drying waste gas outlet of the secondary drying furnace, while drying the ternary catalyst in the secondary drying furnace, the gas with relatively high humidity in the secondary drying furnace can be ventilated, which is beneficial to the rapid drying of the ternary catalyst; by using the roasting fresh air inlet and roasting waste gas outlet of the roasting furnace, the gas in the roasting furnace can be ventilated, promoting the discharge of waste gas in the roasting furnace; by using the connection between the high-temperature waste gas discharged from the roasting furnace and the hot side of the heat exchanger and the connection between the primary drying fresh air inlet, secondary drying fresh air inlet and roasting fresh air inlet and the cold side of the heat exchanger, the fresh air input through the fresh air inlet can be heated by the high-temperature waste gas discharged from the roasting furnace. Since the heating temperature of the roasting furnace is much higher than the drying temperature of the drying furnace, the electric heating burden of the drying furnace is greatly reduced, and even the electric heating device of the drying furnace can be cancelled, which is beneficial to simplifying the structure of the drying furnace. The fresh air flow rates of the primary drying furnace, secondary drying furnace and roasting furnace are much larger than the discharge amount of the high-temperature waste gas from the roasting furnace, effectively improving the recovery and utilization rate of the heat energy in the high-temperature waste gas discharged from the roasting furnace and reducing the thermal efficiency of the ternary catalyst drying and roasting production line of this application.

[0009] In a specific feasible implementation, the cold side outlet includes a first cold side outlet and a second cold side outlet. The first cold side outlet is arranged on the heat exchanger adjacent to the hot side inlet, and the second cold side outlet is arranged on the side of the first cold side outlet away from the hot side inlet. The first cold side outlet is connected to the primary drying fresh air inlet and the secondary drying fresh air inlet, and the second cold side outlet is connected to the roasting fresh air inlet.

[0010] By adopting the above technical solution, by using the first cold side outlet adjacent to the hot side inlet on the heat exchanger and the second cold side outlet arranged on the side of the first cold side outlet away from the hot side inlet, the temperature of the fresh air flowing out through the first cold side outlet is higher than the temperature of the fresh air flowing out through the second cold side outlet, so as to ensure that the temperature of the fresh air flowing into the primary drying furnace through the primary drying fresh air inlet and the temperature of the fresh air flowing into the secondary drying furnace through the secondary drying fresh air inlet reach or approach the drying temperature of the ternary catalyst, reducing the heating burden of the primary drying furnace and the secondary drying furnace.

[0011] In a specific feasible implementation, a primary drying fresh air flow regulating valve is provided on the connection path between the primary drying fresh air inlet and the cold side outlet, a secondary drying fresh air flow regulating valve is provided on the connection path between the secondary drying fresh air inlet and the cold side outlet, and a roasting fresh air flow regulating valve is provided on the connection path between the roasting fresh air inlet and the cold side outlet.

[0012] By adopting the above technical solution, with the settings of the primary drying fresh air flow regulating valve, the secondary drying fresh air flow regulating valve, and the roasting fresh air flow regulating valve, it is possible to conveniently adjust the proportion of fresh air flow into the primary drying furnace, the secondary drying furnace, and the roasting furnace, and thereby adjust the fresh air temperature flowing into the primary drying furnace and the secondary drying furnace.

[0013] In a specific feasible implementation, the primary drying furnace includes multiple primary drying furnace sections. Each primary drying furnace section is provided with a primary drying fresh air inlet and a primary drying waste gas outlet. At least one primary drying fresh air flow regulating valve is provided at each primary drying fresh air inlet, and at least one primary drying exhaust gas flow valve is provided at each primary drying waste gas outlet; the secondary drying furnace includes multiple secondary drying furnace sections. Each secondary drying furnace section is provided with a secondary drying fresh air inlet and a secondary drying waste gas outlet. At least one secondary drying fresh air flow regulating valve is provided at each secondary drying fresh air inlet, and at least one secondary drying exhaust gas flow valve is provided at each secondary drying waste gas outlet; the roasting furnace includes multiple roasting furnace sections. Each roasting furnace section is provided with a roasting fresh air inlet and a roasting waste gas outlet. The roasting fresh air flow regulating valve is provided at each roasting fresh air inlet, and a roasting exhaust gas flow valve is provided at each roasting waste gas outlet.

[0014] By adopting the above technical solution, with the drying fresh air inlets, drying fresh air flow regulating valves, drying waste gas outlets, and drying exhaust gas flow valves provided on each primary drying furnace section and secondary drying furnace section, it is possible to respectively adjust the temperature and humidity in each drying furnace section, which is beneficial to optimizing the drying process of the ternary catalyst; with the roasting fresh air inlets, roasting fresh air flow regulating valves, roasting waste gas outlets, and roasting exhaust gas flow valves provided on each roasting furnace section, it is possible to finely adjust the roasting temperature of each roasting furnace section, which is beneficial to optimizing the roasting process of the ternary catalyst.

[0015] In a specific feasible implementation, a drying furnace conveyor platform is provided at the discharge end of the primary drying furnace. The primary drying furnace includes a drying conveyor mesh belt, which is arranged through the feed inlet and the discharge outlet of the primary drying furnace and extends to the drying furnace conveyor platform.

[0016] By adopting the above technical solution, with the arrangement that the drying conveyor belt extends to the drying furnace conveyor table, the ternary catalyst that has been dried once can be conveyed outside the primary drying furnace for cooling, which is beneficial to the rapid dissipation of moisture in the ternary catalyst and improves the drying speed of the ternary catalyst.

[0017] In a specific feasible implementation, the drying furnace conveyor table includes a drying air-cooling device, and the air outlet of the drying air-cooling device faces the drying conveyor belt at the drying furnace conveyor table.

[0018] By adopting the above technical solution, the drying air-cooling device can be used to blow and cool the ternary catalyst, further improving the cooling speed of the ternary catalyst and the dissipation speed of moisture in the ternary catalyst, which is beneficial to improving the drying efficiency of the ternary catalyst and the rapid transfer of the ternary catalyst.

[0019] In a specific feasible implementation, the ternary catalyst drying and calcining production line of the present application further includes a transfer robotic arm, which is arranged between the drying furnace conveyor table and the feed inlet of the secondary drying furnace.

[0020] By adopting the above technical solution, the transfer robotic arm can be used to transfer the ternary catalyst cooled on the drying furnace conveyor table to the feed inlet of the secondary drying furnace for secondary drying, enabling the transfer process of the ternary catalyst in the ternary catalyst drying and calcining production line of the present application to be automated.

[0021] In a specific feasible implementation, the discharge outlet of the secondary drying furnace is connected to the feed inlet of the calcining furnace. The calcining furnace includes a calcining conveyor belt, and the calcining conveyor belt penetrates through the feed inlet and the discharge outlet of the secondary drying furnace, as well as the feed inlet and the discharge outlet of the calcining furnace.

[0022] By adopting the above technical solution, with the arrangement that the discharge outlet of the secondary drying furnace is connected to the feed inlet of the calcining furnace, the ternary catalyst dried in the secondary drying furnace can directly enter the calcining furnace for calcining, reducing the temperature drop of the ternary catalyst after exiting the secondary drying furnace and the temperature rise after entering the calcining furnace, and improving the calcining efficiency; with the arrangement that the calcining conveyor belt penetrates through the secondary drying furnace and the calcining furnace, it is beneficial to the transfer of the ternary catalyst inside the secondary drying furnace and the calcining furnace, as well as the transfer between the secondary drying furnace and the calcining furnace, simplifying the transfer mechanism and improving the transfer efficiency.

[0023] In a specific feasible embodiment, primary drying furnace door waste gas collection hoods are provided at both the inlet and outlet of the primary drying furnace, a secondary drying furnace door waste gas collection hood is provided at the inlet of the secondary drying furnace, a roasting furnace door waste gas collection hood is provided at the outlet of the roasting furnace, the primary drying furnace door waste gas collection hood and the secondary drying furnace door waste gas collection hood are connected to the waste gas passage, and the roasting furnace door waste gas collection hood is connected to the hot side inlet.

[0024] By adopting the above technical solution, by using the primary drying furnace door waste gas collection hood and the secondary drying furnace door waste gas collection hood, it is possible to collect the high-humidity drying waste gas escaping through the inlet and outlet of the primary drying furnace and the inlet of the secondary drying furnace, and transport it to the waste gas passage for discharge; by using the roasting furnace door waste gas collection hood, it is possible to collect the high-temperature waste gas escaping through the outlet of the roasting furnace and transport it to the hot side inlet of the heat exchanger for reuse.

[0025] In a specific feasible embodiment, a roasting furnace transfer table is provided at the outlet end of the roasting furnace, the roasting conveyor belt extends to the roasting furnace transfer table, and the roasting furnace transfer table includes a roasting air-cooling device, and the air outlet of the roasting air-cooling device faces the roasting conveyor belt at the roasting furnace transfer table.

[0026] By adopting the above technical solution, by using the arrangement that the roasting conveyor belt extends to the roasting furnace transfer table, it is possible to directly convey the roasted ternary catalyst to the roasting furnace transfer table, which is beneficial to simplifying the output mechanism of the ternary catalyst and improving the output efficiency of the ternary catalyst; by using the arrangement that the air outlet of the roasting air-cooling device faces the roasting conveyor belt on the roasting furnace transfer table, it is possible to quickly cool the roasted ternary catalyst, which is beneficial to the transfer of the roasted ternary catalyst as soon as possible and the operation of the next process, and improves the processing efficiency of the ternary catalyst.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. By using the integrated drying and roasting furnace formed by arranging the primary drying furnace, the secondary drying furnace and the roasting furnace in sequence, it is possible to continuously dry and roast the ternary catalyst, and while ensuring the drying and roasting effects, improve the drying and roasting efficiency of the ternary catalyst;

[0029] 2. By using the fresh air inlet and the drying waste gas outlet on the primary drying furnace and the secondary drying furnace, it is possible to discharge the drying waste gas with a high water vapor content formed by the evaporation of water in the ternary catalyst in the drying furnace while drying the ternary catalyst, reduce the water vapor content in the furnace, which is beneficial to the drying of the ternary catalyst on the one hand, and on the other hand, prevent the oxidation of the furnace structure in the high-temperature environment and the electric breakdown of electrical equipment caused by the high water content;

[0030] 3. By setting up the heat exchanger, the hot and low-moisture-content roasting waste gas in the roasting furnace can be used to heat the fresh air entering the primary drying furnace and the secondary drying furnace, so that the temperature of the fresh air entering the primary drying furnace and the secondary drying furnace reaches or approaches the drying temperature. Thus, the electric heating components in the primary drying furnace and the secondary drying furnace can be cancelled or simplified, the structures of the primary drying furnace and the secondary drying furnace can be simplified, and the fresh air entering the roasting furnace can be preheated by the roasting waste gas, jointly reducing the overall heat consumption of the drying and roasting integrated furnace.

[0031] 4. By setting up the drying furnace conveyor table and the drying air-cooling device, the ternary catalyst after primary drying can be sent out of the furnace, the moisture in the ternary catalyst can be quickly removed, and after rapid cooling, it can be sent to the secondary drying furnace for secondary drying, which can effectively remove the moisture content in the ternary catalyst, improve the drying efficiency of the ternary catalyst, is conducive to the uniform adhesion of the catalytic medium on the surface of the porous carrier, and prevents the catalytic medium from blocking the pores inside the porous carrier. Description of the Drawings

[0032] Figure 1 It is a top view of an embodiment of the present application.

[0033] Figure 2 It is a partial side view of the primary drying furnace in an embodiment of the present application.

[0034] Figure 3 It is a partial side view of the secondary drying furnace and the roasting furnace in an embodiment of the present application.

[0035] Figure 4 It is Figure 1 The elevation schematic diagram of part A-A in

[0036] Figure 5 It is a schematic diagram of the heat exchanger in an embodiment of the present application.

[0037] Description of the reference numerals in the drawings: 1. Primary drying furnace; 11. Primary drying fresh air inlet; 111. Primary drying flow regulating valve; 12. Primary drying waste gas outlet; 121. Primary drying exhaust gas flow valve; 122. Primary drying waste gas pipeline; 123. Primary drying waste gas exhaust fan; 13. Drying conveyor mesh belt; 14. Primary drying furnace door waste gas collection hood; 2. Secondary drying furnace; 21. Secondary drying fresh air inlet; 211. Secondary drying flow regulating valve; 22. Secondary drying waste gas outlet; 221. Secondary drying exhaust gas flow valve; 222. Secondary drying waste gas pipeline; 223. Secondary drying waste gas exhaust fan; 23. Secondary drying furnace door waste gas collection hood; 3. Roasting furnace; 31. Roasting fresh air inlet; 311. Roasting flow regulating valve; 32. Roasting waste gas outlet; 321. Roasting exhaust gas flow valve; 322. Roasting waste gas pipeline; 33. Roasting conveyor mesh belt; 34. Roasting furnace door waste gas collection hood; 4. Heat exchanger; 41. Hot side inlet; 42. Hot side outlet; 421. Hot side output pipeline; 43. Cold side inlet; 44. Cold side outlet; 441. First cold side outlet; 442. Second cold side outlet; 45. Hot side exhaust fan; 46. Fresh air exhaust fan; 5. Drying furnace conveyor platform; 51. Drying air cooling device; 6. Roasting furnace conveyor platform; 61. Roasting air cooling device. Detailed implementation manners

[0038] The following will describe in detail the detailed implementation manners of the present application with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only for the purpose of illustration and explanation of the present application, and are not used to limit the present application.

[0039] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "arrangement" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0040] In this specification, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features.

[0041] An embodiment of the ternary catalyst drying and roasting production line of the present application is as Figures 1 to 4As shown in the figure, it includes a primary drying furnace 1, a secondary drying furnace 2, a roasting furnace 3 and a heat exchanger 4. The primary drying furnace 1 and the secondary drying furnace 2 are used to dry the ternary catalyst with a relatively high water content after spraying the catalytic medium to remove the moisture therein. The roasting furnace 3 is used to perform high-temperature roasting on the ternary catalyst so that the catalytic medium firmly adheres to the porous carrier. The primary drying furnace 1, the secondary drying furnace 2 and the roasting furnace 3 are all provided with a feed inlet and a discharge outlet. A conveyor mesh belt is arranged between the feed inlet and the discharge outlet, and heating devices are arranged in the primary drying furnace 1, the secondary drying furnace 2 and the roasting furnace 3.

[0042] The primary drying furnace 1, the secondary drying furnace 2 and the roasting furnace 3 are arranged in sequence. The ternary catalyst after spraying the catalytic medium is placed at the feed inlet of the primary drying furnace 1 and is conveyed from the feed inlet to the discharge outlet direction by the primary drying conveyor mesh belt 13 in the primary drying furnace 1, and is dried at the same time by being heated to about 150 °C by the heating device. The discharge outlet of the primary drying furnace 1 is near the feed inlet of the secondary drying furnace 2, which is convenient for transferring the ternary catalyst sent out from the discharge outlet of the primary drying furnace 1 to the feed inlet of the secondary drying furnace 2 and entering the secondary drying furnace 2 for secondary drying.

[0043] The ternary catalyst moves from the feed inlet to the discharge outlet direction on the conveyor mesh belt in the secondary drying furnace 2 and is heated to about 150 °C for secondary drying under the action of the heating device in the secondary drying furnace 2. The dried ternary catalyst is sent out through the discharge outlet. The discharge outlet of the secondary drying furnace 2 is near the feed inlet of the roasting furnace 3, which is convenient for sending the ternary catalyst after secondary drying into the roasting furnace 3.

[0044] The ternary catalyst moves from the feed inlet to the discharge outlet direction on the conveyor mesh belt in the roasting furnace 3 and is heated to above 500 °C by the heating device of the roasting furnace to roast the ternary catalyst so that the catalytic medium of the ternary catalyst firmly adheres to the porous ceramic. The roasted ternary catalyst is transferred out through the discharge outlet of the roasting furnace 3 for the operation of the next process. The sequentially arranged primary drying furnace 1, secondary drying furnace 2 and roasting furnace 3 can continuously dry and roast the ternary catalyst, effectively improving the drying and roasting efficiency of the ternary catalyst.

[0045] An initial drying furnace 1 is provided with an initial drying fresh air inlet 11 and an initial drying waste gas outlet 12. Generally, the initial drying fresh air inlet 11 is arranged in the bottom area of the initial drying furnace 1, such as at the bottom of one side wall of the initial drying furnace 1. Through the initial drying fresh air inlet 11, fresh air from the outside can be supplemented to reduce the high water vapor content formed by the evaporation of moisture in the ternary catalyst in the initial drying furnace 1; the initial drying waste gas outlet 12 is arranged in the top area of the initial drying furnace 1, such as at the top of the initial drying furnace 1 above the initial drying conveyor mesh belt 13, which is conducive to the discharge of the high water content and high-temperature waste gas formed by drying the ternary catalyst. By continuously discharging the waste gas from drying the ternary catalyst with high water content and supplementing fresh air with low water content from the outside, the water vapor formed by drying the ternary catalyst can be continuously discharged, the drying speed of the ternary catalyst can be increased, and at the same time, the discharge of electrical components caused by excessive water content in the initial drying furnace 1 can be prevented, improving the stability of the drying process.

[0046] A secondary drying furnace 2 is provided with a secondary drying fresh air inlet 21 and a secondary drying waste gas outlet 22. The secondary drying fresh air inlet 21 is usually arranged in the bottom area on one side of the secondary drying furnace 2, so that the fresh air with low water content and relatively low temperature from the outside can enter from the bottom position of the secondary drying furnace 2. The secondary drying waste gas outlet 22 is usually arranged at a position opposite to the conveyor mesh belt at the top of the secondary drying furnace 2, which is conducive to the discharge of the drying waste gas with high water content and relatively high temperature formed by drying the ternary catalyst.

[0047] A roasting furnace 3 is provided with a roasting fresh air inlet 31 and a roasting waste gas outlet 32. Similarly, the roasting fresh air inlet 31 is arranged in the bottom area on one side of the roasting furnace 3, and the roasting waste gas outlet 32 is arranged at the top of the roasting furnace 3 above the conveyor mesh belt. By supplementing fresh air from the outside through the roasting fresh air inlet 31, the discharge of roasting waste gas in the roasting furnace 3 can be promoted.

[0048] As Figure 5 shown, the heat exchanger 4 can use various existing heat exchange devices. The heat exchanger 4 is provided with a hot side inlet 41, a hot side outlet 42, a cold side inlet 43 and a cold side outlet 44. The hot side inlet 41 and the hot side outlet 42 are interconnected through a high-temperature medium channel inside the heat exchanger 4, and the cold side inlet 43 and the cold side outlet 44 are interconnected through a low-temperature medium channel inside the heat exchanger 4. The high-temperature medium channels are interconnected and isolated from the low-temperature medium channels, but heat exchange can be carried out.

[0049] The hot-side inlet 41 is connected to the calcination waste gas outlet 32 through the calcination waste gas pipeline 322. The hot-side outlet 42 is connected to the waste gas passage through the hot-side exhaust fan 45. When the hot-side exhaust fan 45 operates, the calcination waste gas with a temperature higher than 500 °C in the calcination furnace 3 is extracted, passes through the calcination waste gas pipeline 322 and the high-temperature medium passage in the heat exchanger 4, and then is discharged through the waste gas passage. The cold-side inlet 43 is connected to the external space through the fresh air exhaust fan 46. The cold-side outlet 44 is connected to the primary drying fresh air inlet 11, the secondary drying fresh air inlet 21, and the calcination fresh air inlet 31 through the fresh air pipeline respectively. When the fresh air exhaust fan 46 operates, the fresh air outside is drawn into the cold-side inlet 43, passes through the low-temperature medium passage of the heat exchanger 4, and then enters the primary drying furnace 1 through the primary drying fresh air inlet 11, enters the secondary drying furnace 2 through the secondary drying fresh air inlet 21, and enters the calcination furnace 3 through the calcination fresh air inlet 31.

[0050] The high-temperature calcination waste gas exchanges heat with the fresh air in the low-temperature medium passage, causing the temperature of the calcination waste gas to drop and the temperature of the fresh air to rise. Since the fresh air in the low-temperature medium passage simultaneously supplements the waste gas discharged from the primary drying furnace 1, the secondary drying furnace 2, and the calcination furnace 3, the flow rate of the fresh air is significantly greater than that of the calcination waste gas. Therefore, the temperature of the calcination waste gas can be reduced from above 500 °C to below 130 °C, effectively reducing the heat energy waste caused by the discharge of the calcination waste gas. Moreover, the reduction of the temperature of the calcination waste gas decreases the requirement for the high-temperature tolerance of the hot-side exhaust fan 45, reduces the cost of the hot-side exhaust fan 45, and extends the service life of the hot-side exhaust fan 45. The temperature of the fresh air can be heated to above 150 °C, basically meeting the temperature requirement for drying the ternary catalyst. Therefore, the temperature in the primary drying furnace 1 and the secondary drying furnace 2 can be heated to the set drying temperature by the fresh air. In this way, an electric heating device may not be installed in the primary drying furnace 1 and the secondary drying furnace 2, or only a small-power electric heating device may be installed for necessary temperature adjustment, simplifying the structures of the primary drying furnace 1 and the secondary drying furnace 2 and reducing the energy consumption of the primary drying furnace 1 and the secondary drying furnace 2. After the temperature of the fresh air entering the calcination furnace 3 increases, the decrease in the temperature in the calcination furnace 3 caused by the fresh air supplement is reduced, and the energy consumption of the calcination furnace 3 is also reduced.

[0051] The primary drying exhaust gas outlet 12 is connected to the primary drying exhaust gas fan 123 through the primary drying exhaust gas pipe 122, and is connected to the exhaust gas passage through the primary drying exhaust gas fan 123. When the primary drying exhaust gas fan 123 is operating, it can draw the drying exhaust gas with a very high water content in the primary drying furnace 1 into the exhaust gas passage for discharge. The secondary drying exhaust gas outlet 22 is connected to the secondary drying exhaust gas fan 223 through the secondary drying exhaust gas pipe 222, and is connected to the exhaust gas passage through the secondary drying exhaust gas fan 223. When the secondary drying exhaust gas fan 223 is operating, it can draw the drying exhaust gas with a relatively high water content in the secondary drying furnace 2 into the exhaust gas passage for discharge.

[0052] The exhaust gases in the primary drying furnace 1, secondary drying furnace 2 and roasting furnace 3 can be discharged through the same exhaust gas passage, or can be discharged through independent exhaust gas passages respectively. Usually when discharging the exhaust gas, necessary treatment will be carried out on the exhaust gas according to environmental protection requirements. The temperature of the drying exhaust gas in the primary drying furnace 1 and secondary drying furnace 2 is usually below 150°C. The relatively low temperature results in a relatively low heat recovery value, and the too high water content is also likely to cause damage to the heat exchange device. Therefore, the exhaust gas discharged from the primary drying furnace 1 and secondary drying furnace 2 is directly discharged.

[0053] In some embodiments of the ternary catalyst drying and roasting production line of the present application, as Figure 5 shown, the cold side inlet 43 of the heat exchanger 4 is arranged at one end where the hot side outlet 42 is located, and the cold side outlet 44 is arranged at the end where the hot side inlet 41 is located. The fresh air entering the heat exchanger 4 through the cold side inlet 43 continuously exchanges heat with the roasting exhaust gas entering the heat exchanger 4 through the hot side inlet 41 during the process of flowing towards the cold side outlet 44, so that the temperature of the fresh air continuously rises; at the same time, during the process of flowing from the hot side inlet 41 to the hot side outlet 42, the roasting exhaust gas gradually decreases in temperature due to continuous heat exchange with the fresh air.

[0054] There are two cold-side outlets 44 of the heat exchanger 4: a first cold-side outlet 441 and a second cold-side outlet 442. Among them, the first cold-side outlet 441 is arranged closer to the hot-side inlet 41 on the heat exchanger 4, and the second cold-side outlet 442 is arranged on the side opposite to the first cold-side outlet 441 with respect to the hot-side inlet 41. In this way, the fresh air flowing out through the first cold-side outlet 441 can have a longer heat exchange time with the roasting waste gas and can exchange heat with the hotter roasting waste gas, so it has a higher temperature, while the temperature of the fresh air flowing out through the second cold-side outlet 442 is lower, thus ensuring that the temperature of the fresh air flowing out through the first cold-side outlet 441 is more likely to reach the temperature required for drying the ternary catalyst. The first cold-side outlet 441 is connected to the primary drying fresh air inlet 11 and the secondary drying fresh air inlet 21, and the fresh air with a higher temperature is used to meet the need for drying the ternary catalyst; the second cold-side outlet 442 is connected to the roasting fresh air inlet 31 to be able to recover more of the energy contained in the roasting waste gas.

[0055] In a preferred embodiment of the ternary catalyst drying and roasting production line of the present application, as Figure 1 shown, on the connection path between the primary drying fresh air inlet 11 and the cold-side outlet 44, usually a primary drying flow regulating valve 111 is arranged near the primary drying fresh air inlet 11. The primary drying flow regulating valve 111 can use various existing flow regulating valves. By adjusting the primary drying flow regulating valve 111, the flow rate of the fresh air entering the primary drying furnace 1 through the primary drying fresh air inlet 11 can be adjusted. Similarly, on the connection path between the secondary drying fresh air inlet 21 and the cold-side outlet 44, usually a secondary drying flow regulating valve 211 is arranged near the secondary drying fresh air inlet 21. By adjusting the secondary drying flow regulating valve 211, the flow rate of the fresh air entering the secondary drying furnace 2 through the secondary drying fresh air inlet 21 can be adjusted. On the connection path between the roasting fresh air inlet 31 and the cold-side outlet 44, usually a roasting flow regulating valve 311 is arranged near the roasting fresh air inlet 31. By adjusting the roasting flow regulating valve 311, the flow rate of the fresh air entering the roasting furnace 3 through the roasting fresh air inlet 31 can be adjusted. By comprehensively adjusting the primary drying flow regulating valve 111, the secondary drying flow regulating valve 211 and the roasting flow regulating valve 311, the proportion of fresh air flowing into the primary drying furnace 1, the secondary drying furnace 2 and the roasting furnace 3 can be controlled, which is beneficial to meeting the temperature control requirements in the primary drying furnace 1, the secondary drying furnace 2 and the roasting furnace 3.

[0056] As a specific implementation manner of the ternary catalyst drying and roasting production line of the present application, as Figures 1 to 3As shown, the primary drying furnace 1 includes a plurality of primary drying furnace sections with the same structure. Each primary drying furnace section is provided with a primary drying fresh air inlet 11 and a primary drying waste gas outlet 12. At each primary drying fresh air inlet 11, there is at least one, usually two primary drying flow regulating valves 111. And at each primary drying waste gas outlet 12, there is at least one, usually two primary drying exhaust flow valves 121. In this way, the fresh air supply flow rate and the drying waste gas discharge flow rate of each primary drying furnace section can be independently controlled, so that the temperature and the water vapor discharge rate in different segmented areas in the primary drying furnace 1 can be independently controlled, optimizing the drying effect of the primary drying furnace 1 on the three-way catalyst.

[0057] The secondary drying furnace 2 also includes a plurality of secondary drying furnace sections with the same structure. Each secondary drying furnace section is provided with a secondary drying fresh air inlet 21 and a secondary drying waste gas outlet 22. At each secondary drying fresh air inlet 21, there is at least one, usually two secondary drying flow regulating valves 211. And at each secondary drying waste gas outlet 22, there is at least one, usually two secondary drying exhaust flow valves 221. Through the secondary drying flow regulating valves 211 and the secondary drying exhaust flow valves 221 at each secondary drying furnace section, the fresh air supply flow rate and the drying waste gas discharge flow rate of each secondary drying furnace section can be independently controlled, so that the temperature and the water vapor discharge rate in different segmented areas in the secondary drying furnace 2 can be independently controlled, optimizing the drying effect of the secondary drying furnace 2 on the three-way catalyst.

[0058] Similarly, the calcining furnace 3 also includes a plurality of calcining furnace sections with the same structure. Each calcining furnace section is provided with a calcining fresh air inlet 31 and a calcining waste gas outlet 32. An independent electric heating device is arranged in each calcining furnace section. And at each calcining fresh air inlet 31, there is a calcining flow regulating valve 311. At each calcining waste gas outlet 32, there is a calcining exhaust flow valve 321. Through the calcining flow regulating valves 311 and the calcining exhaust flow valves 321 of each calcining furnace section, the fresh air supply flow rate and the calcining waste gas discharge flow rate of each calcining furnace section can be independently controlled, so that parameters such as the calcining temperature in different segmented areas in the calcining furnace 3 can be independently controlled in cooperation with the electric heating device in each calcining furnace section, further optimizing the calcining process of the three-way catalyst.

[0059] In some embodiments of the three-way catalyst drying and calcining production line of the present application, such as Figure 1 and Figure 2As shown, a drying furnace conveyor platform 5 is provided outside the discharge port of the primary drying furnace 1. The drying furnace conveyor platform 5 can be various platforms capable of carrying high-temperature ternary catalysts. The drying conveyor mesh belt 13 inside the primary drying furnace 1 for conveying the ternary catalyst from the feed port to the discharge port runs through the feed port and the discharge port at both ends of the primary drying furnace 1, and extends out of the feed port and the discharge port at both ends to the outside of the primary drying furnace 1. The drying conveyor mesh belt 13 extending out of the discharge port passes over the drying furnace conveyor platform 5, and conveys the ternary catalyst after primary drying out of the primary drying furnace 1. The moisture in the ternary catalyst rapidly evaporates in the relatively dry outside air, which is beneficial to the rapid reduction of the moisture content in the ternary catalyst.

[0060] In a preferred embodiment of the ternary catalyst drying and calcination production line of the present application, as Figure 1 and Figure 2 shown, a drying air-cooling device 51 is provided on the drying furnace conveyor platform 5. The drying air-cooling device 51 is arranged on one side of the drying conveyor mesh belt 13 on the drying furnace conveyor platform 5, and the air outlet of the drying air-cooling device 51 faces the drying conveyor mesh belt 13 on the drying furnace conveyor platform 5. When the ternary catalyst in the primary drying furnace 1 moves onto the drying furnace conveyor platform 5 along with the drying conveyor mesh belt 13, the air flow blown out from the air outlet of the drying air-cooling device 51 blows towards the ternary catalyst and can enter the pores inside the ternary catalyst, so that the water vapor inside the ternary catalyst rapidly dissipates, and promotes the evaporation of the moisture in the ternary catalyst, which is beneficial to improving the drying effect of the ternary catalyst in the subsequent drying process.

[0061] As a specific implementation manner of the ternary catalyst drying and calcination production line of the present application, a transfer robotic arm is provided between the drying furnace conveyor platform 5 and the feed port of the secondary drying furnace 2. The transfer robotic arm can use a commercially available general robotic arm. The transfer robotic arm can pick up the ternary catalyst cooled by the drying air-cooling device on the drying furnace conveyor platform 5 and place it at the feed port of the secondary drying furnace 2, so that the ternary catalyst can enter the secondary drying furnace 2 for further drying, enabling the production process of the ternary catalyst drying and calcination production line of the present application to run smoothly and automatically.

[0062] In some embodiments of the ternary catalyst drying and calcination production line of the present application, as Figure 1 and Figure 3As shown in the figure, the discharge port of the secondary drying furnace 2 is connected to the feed port of the roasting furnace 3. Moreover, both ends of the roasting conveyor belt 33 arranged in the roasting furnace 3 extend out from the feed port and the discharge port of the roasting furnace 3 respectively. Among them, the roasting conveyor belt extending out from the discharge port of the roasting furnace 3 passes through the feed port and the discharge port of the secondary drying furnace 2 and extends out from the feed port of the secondary drying furnace 2. When the roasting conveyor belt 33 operates, it can convey the ternary catalyst from outside the feed port of the secondary drying furnace 2 into the secondary drying furnace 2. After secondary drying in the secondary drying furnace 2, it passes through the discharge port of the secondary drying furnace 2 and the feed port of the roasting furnace 3 and directly enters the roasting furnace 3 for roasting. In this way, on the one hand, it can reduce the temperature drop of the ternary catalyst after it is transferred out of the discharge port of the secondary drying furnace 2 and before it enters the feed port of the roasting furnace 3, and the repeated temperature rise after it enters the feed port of the roasting furnace 3. On the other hand, it can reduce the heat dissipation through the discharge port of the secondary drying furnace 2 and the feed port of the roasting furnace 3, so as to reduce the heat energy loss of the ternary catalyst drying and roasting production line of the present application.

[0063] In a preferred embodiment of the ternary catalyst drying and roasting production line of the present application, as Figure 2 and Figure 3 shown, primary drying furnace door exhaust gas collection hoods 14 are provided at both the feed port and the discharge port of the primary drying furnace 1, a secondary drying furnace door exhaust gas collection hood 23 is provided at the feed port of the secondary drying furnace 2, and a roasting furnace door exhaust gas collection hood 34 is provided at the discharge port of the roasting furnace 3. The primary drying furnace door exhaust gas collection hood 14, the secondary drying furnace door exhaust gas collection hood 23 and the roasting furnace door exhaust gas collection hood 34 are all metal hoods with one side open. The openings of the two primary drying furnace door exhaust gas collection hoods 14 are respectively arranged facing the feed port and the discharge port of the primary drying furnace 1. The opening of the secondary drying furnace door exhaust gas collection hood 23 is arranged facing the feed port of the secondary drying furnace 2, and pipes communicating with the exhaust gas channel are provided at the tops of the primary drying furnace door exhaust gas collection hood 14 and the secondary drying furnace door exhaust gas collection hood 23; the opening of the roasting furnace door exhaust gas collection hood 34 is arranged facing the discharge port of the roasting furnace 3, and the top of the roasting furnace door exhaust gas collection hood 34 is connected to the hot side inlet 41 through a pipe.

[0064] The primary drying furnace door exhaust gas collection hood 14, the secondary drying furnace door exhaust gas collection hood 23 and the roasting furnace door exhaust gas collection hood 34 can, on the one hand, respectively collect the exhaust gas escaping through the feed port and the discharge port of the primary drying furnace 1, the feed port of the secondary drying furnace 2 and the discharge port of the roasting furnace 3, reducing the pollution of the exhaust gas to the production environment; on the other hand, they can block the heat radiation inside the primary drying furnace 1, the secondary drying furnace 2 and the roasting furnace 3, reducing the heat radiation loss of the production line and reducing the amplitude of the increase in the production environment temperature caused by the heat radiation.

[0065] In some embodiments of the ternary catalyst drying and roasting production line of the present application, as Figure 1 andFigure 3 As shown in the figure, a roasting furnace conveyor table 6 is provided outside the discharge port of the roasting furnace 3. The roasting furnace conveyor table 6 can be various platforms capable of carrying high-temperature ternary catalysts. One end of the roasting conveyor mesh belt 33 extends out of the discharge port of the roasting furnace 3 to the outside of the roasting furnace 3, passes through the roasting furnace conveyor table 6, and can convey the roasted ternary catalyst onto the roasting furnace conveyor table 6 of the roasting furnace 3. A roasting air-cooling device 61 is provided on the roasting furnace conveyor table 6. The roasting air-cooling device 61 is arranged on one side of the roasting conveyor mesh belt 33 on the roasting furnace conveyor table 6, and the air outlet of the roasting air-cooling device 61 is arranged facing the roasting conveyor mesh belt 33 on the roasting furnace conveyor table 6.

[0066] When the roasted ternary catalyst is output from the discharge port of the roasting furnace 3, the roasting air-cooling device 61 can blow cooling air to the ternary catalyst, so that the ternary catalyst can be quickly cooled from a high-temperature state. Generally, the roasting air-cooling device 61 can generate cooling air of 1500 Pa and 90000 Nm 3 / h, quickly cool the ternary catalyst to below 100 °C. At this time, the ternary catalyst can be taken away by the robotic arm and sent to the next process for subsequent operation, effectively improving the turnover efficiency of the ternary catalyst.

[0067] In the description of the present invention, the description referring to terms such as "one embodiment", "specific embodiment", "preferred embodiment", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0068] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A three-way catalyst drying and calcination production line, characterized in that: It includes a primary drying furnace (1), a secondary drying furnace (2), a roasting furnace (3) and a heat exchanger (4). The primary drying furnace (1), the secondary drying furnace (2) and the roasting furnace (3) are arranged in sequence. The primary drying furnace (1) includes a primary drying fresh air inlet (11) and a primary drying waste gas outlet (12). The secondary drying furnace (2) includes a secondary drying fresh air inlet (21) and a secondary drying waste gas outlet (22). The roasting furnace (3) includes a roasting fresh air inlet (31) and a roasting waste gas outlet (32). The heat exchanger (4) includes a hot side inlet (41), a hot side outlet (42), a cold side inlet (43) and a cold side outlet (44). The hot side inlet (41) is communicated with the roasting waste gas outlet (32). The hot side outlet (42) is communicated with an exhaust gas passage. The cold side inlet (43) is communicated with the external space, and the cold side outlet (44) is respectively communicated with the primary drying fresh air inlet (11), the secondary drying fresh air inlet (21) and the roasting fresh air inlet (31). The primary drying waste gas outlet (12) and the secondary drying waste gas outlet (22) are respectively communicated with the exhaust gas passage; The cold side outlet (44) includes a first cold side outlet (441) and a second cold side outlet (442). The first cold side outlet (441) is arranged on the heat exchanger (4) adjacent to the hot side inlet (41) to ensure that the temperature of the fresh air flowing out through the first cold side outlet (441) is easy to reach the temperature required for drying the ternary catalyst. The second cold side outlet (442) is arranged on one side of the first cold side outlet (441) away from the hot side inlet (41). The first cold side outlet (441) is connected with the primary drying fresh air inlet (11) and the secondary drying fresh air inlet (21). The second cold side outlet (442) is connected with the roasting fresh air inlet (31); A primary drying flow regulating valve (111) is arranged on the connection path between the primary drying fresh air inlet (11) and the cold side outlet (44). A secondary drying flow regulating valve (211) is arranged on the connection path between the secondary drying fresh air inlet (21) and the cold side outlet (44). A roasting flow regulating valve (311) is arranged on the connection path between the roasting fresh air inlet (31) and the cold side outlet (44). By comprehensively regulating the primary drying flow regulating valve (111), the secondary drying flow regulating valve (211) and the roasting flow regulating valve (311), the proportion of fresh air flowing into the primary drying furnace (1), the secondary drying furnace (2) and the roasting furnace (3) can be controlled.

2. The three-way catalyst drying and calcination production line according to claim 1, wherein: The primary drying furnace (1) includes a plurality of primary drying furnace sections. Each primary drying furnace section is provided with a primary drying fresh air inlet (11) and a primary drying waste gas outlet (12). At least one primary drying flow regulating valve (111) is provided at each primary drying fresh air inlet (11), and at least one primary drying exhaust flow valve (121) is provided at each primary drying waste gas outlet (12). The secondary drying furnace (2) includes a plurality of secondary drying furnace sections. Each secondary drying furnace section is provided with a secondary drying fresh air inlet (21) and a secondary drying waste gas outlet (22). At least one secondary drying flow regulating valve (211) is provided at each secondary drying fresh air inlet (21), and at least one secondary drying exhaust flow valve (221) is provided at each secondary drying waste gas outlet (22). The roasting furnace (3) includes a plurality of roasting furnace sections. Each roasting furnace section is provided with a roasting fresh air inlet (31) and a roasting waste gas outlet (32). The roasting flow regulating valve (311) is provided at each roasting fresh air inlet (31), and the roasting exhaust flow valve (321) is provided at each roasting waste gas outlet (32).

3. The three-way catalyst drying and calcining production line according to claim 1 or 2, characterized in that: A drying furnace transfer table (5) is provided at the discharge port end of the primary drying furnace (1). The primary drying furnace (1) includes a drying transfer mesh belt (13). The drying transfer mesh belt (13) is arranged through the feed port and the discharge port of the primary drying furnace (1) and extends to the drying furnace transfer table (5).

4. The three-way catalyst drying and calcination production line according to claim 3, characterized in that: The drying furnace transfer table (5) includes a drying air-cooling device (51). The air outlet of the drying air-cooling device (51) faces the drying transfer mesh belt (13) at the drying furnace transfer table (5).

5. The three-way catalyst drying and calcining production line according to claim 4, characterized in that: It further includes a transfer robotic arm, which is arranged between the drying furnace transfer table (5) and the feed port of the secondary drying furnace (2).

6. The three-way catalyst drying and calcination production line according to claim 1 or 2, characterized in that: The discharge port of the secondary drying furnace (2) is connected to the feed port of the roasting furnace (3). The roasting furnace (3) includes a roasting transfer mesh belt (33). The roasting transfer mesh belt (33) is arranged through the feed port and the discharge port of the secondary drying furnace (2), as well as the feed port and the discharge port of the roasting furnace (3).

7. The three-way catalyst drying and calcination production line according to claim 6, characterized in that: Primary drying furnace door waste gas collection hoods (14) are provided at both the feed port and the discharge port of the primary drying furnace (1). A secondary drying furnace door waste gas collection hood (23) is provided at the feed port of the secondary drying furnace (2). A roasting furnace door waste gas collection hood (34) is provided at the discharge port of the roasting furnace (3). The primary drying furnace door waste gas collection hood (14) and the secondary drying furnace door waste gas collection hood (23) are respectively communicated with the waste gas channel. The roasting furnace door waste gas collection hood (34) is communicated with the hot side inlet (41).

8. The three-way catalyst drying and calcining production line according to claim 6, characterized in that: A roasting furnace conveyor table (6) is provided at the discharge port end of the roasting furnace (3). The roasting conveyor mesh belt (33) extends to the roasting furnace conveyor table (6). The roasting furnace conveyor table (6) includes a roasting air-cooling device (61). The air outlet of the roasting air-cooling device (61) faces the roasting conveyor mesh belt (33) at the roasting furnace conveyor table (6).

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