[0043] In order to better understand the technical solutions provided by the embodiments of the present specification, the technical solutions of the embodiments of the present specification will be described in detail below with reference to the accompanying drawings and specific embodiments. The detailed description of the technical solutions of the embodiments is not a limitation on the technical solutions of the present specification, and the embodiments of the present specification and the technical features in the embodiments may be combined with each other under the condition of no conflict.
[0044] In this document, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such existence between these entities or operations. The actual relationship or sequence. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element. The term "two or more" includes two or more instances.
[0045] At present, the alumina rotary kiln adopts wet feeding method. The heat exchange between the hot air injected into the rotary kiln and the slurry injected into the rotary kiln can easily cause the temperature of the exhaust gas from the rotary kiln to drop rapidly, resulting in the discharge from the rotary kiln. The temperature of the exhaust gas is low, resulting in a low efficiency of exhaust gas denitration, and the nitrogen oxide content of the exhaust gas is difficult to meet the standard.
[0046] The embodiments of the present application provide a feeding method and related equipment for alumina clinker sintering, which can improve the problems of low denitration efficiency of the exhaust gas discharged from the existing alumina rotary kiln, and the nitrogen oxide content of the exhaust gas is difficult to meet the standard.
[0047] A first aspect of the embodiments of the present application provides a method for feeding alumina clinker sintering, figure 1 A schematic flow chart of a feeding method for alumina clinker sintering provided in the embodiment of the present application. like figure 1 As shown, the feeding method for alumina clinker sintering provided by the embodiments of the present application includes:
[0048] S100: injecting hot flame into the sintering cavity of the alumina clinker rotary kiln. The hot flame can be obtained by burning fuel, and the hot flame is used for heat exchange in the sintering cavity, which is not specifically limited in the embodiment of the present application.
[0049]S200: Controlling the injection amount of the slurry close to the flue to be smaller than the injection amount of the slurry far from the flue, wherein the slurry injected into the sintering cavity is used for heat exchange with the hot flame. The slurry and the hot flame exchange heat in the sintering chamber, the exhaust gas is discharged from the flue, the slurry after heat exchange falls on the bottom of the sintering chamber, and continues to react in the high-temperature airflow brought by the hot flame to form alumina clinker. Complete sintering. Control the amount of slurry injected near the flue to be smaller than that far from the flue, and the total amount of slurry will not change. Since the amount of slurry injected near the flue is smaller than that far from the flue, less heat exchange occurs in the area near the flue, and the temperature of the exhaust gas near the area below the flue will not drop sharply. The exhaust gas will be discharged out of the flue with high temperature for subsequent denitration treatment, and the denitration efficiency of the high temperature exhaust gas in the denitration process is high. It is easy to understand that the denitration efficiency of the exhaust gas increases with the increase of the temperature. The higher the temperature of the exhaust gas, the higher the denitration efficiency, the lower the nitrogen oxide content in the exhaust gas after denitration, and the better it can meet the environmental protection standards.
[0050] In the feeding method for alumina clinker sintering provided by the embodiments of the present application, by controlling the injection amount of slurry close to the flue to be smaller than the injection amount of slurry far from the flue, the total amount of slurry will not change. Compared with the prior art, the amount of slurry injected near the flue area is large, and the amount of slurry injected away from the flue area is small, which easily leads to more heat exchange near the flue area, making the temperature of the exhaust gas discharged. lower, resulting in the problem of lower denitration efficiency of the subsequent exhaust gas. By using the alumina clinker sintering feeding method provided in the embodiment of the present application, less heat exchange occurs in the area close to the flue, and the temperature of the exhaust gas in the area close to the bottom of the flue will not drop sharply, and the exhaust gas It will be discharged from the flue with high temperature for subsequent denitration treatment. The denitration efficiency of the high temperature exhaust gas in the denitration process is high, which can make the nitrogen oxide content in the exhaust gas discharge meet the environmental protection standards.
[0051] In some embodiments, step S200 may include:
[0052] By adjusting the nozzle diameter of the slurry spray gun set close to the flue is smaller than the nozzle diameter of the slurry spray gun set far away from the flue, the injection volume of the slurry close to the flue is controlled to be smaller than that far from the flue. It should be noted that the diameter of the nozzle of the slurry spray gun can be adjustable or fixed. The diameter of the nozzle to adjust the slurry spray gun can be the diameter of the adjustable diameter nozzle, or it can be directly in the area close to the flue. A slurry spray gun with a smaller nozzle diameter is arranged, and a slurry spray gun with a larger nozzle diameter is arranged in an area away from the flue, which is not specifically limited in the embodiments of the present application.
[0053] It is also possible to control the amount of slurry injected near the flue to be smaller than that of the slurry far from the flue by adjusting the slurry flow rate of the slurry spray gun set close to the flue to be smaller than the slurry flow rate of the slurry spray gun set far away from the flue. quantity. The flow rate of the slurry sprayed by the slurry spray gun can be adjusted by adjusting the flow rate of the spray pump connected to the slurry spray gun. Specifically, different slurry flows can correspond to different spray pumps, which can achieve precise flow control. The embodiments of the present application are not specifically limited.
[0054] In some embodiments, the feeding method of alumina clinker sintering further comprises:
[0055] Increase the temperature of the hot flame injected into the sintering chamber. Increasing the temperature of the hot flame can be achieved by increasing the amount of fuel for generating the hot flame, or by increasing the injection amount of the hot flame, which is not specifically limited in the embodiments of the present application.
[0056] Exemplarily, increasing the temperature of the hot flame injected into the sintering cavity may include:
[0057] Increase the input of pulverized coal to the burner of the alumina clinker rotary kiln to increase the temperature of the hot flame injected into the sintering chamber.
[0058] The feeding method for alumina clinker sintering provided by the embodiment of the present application increases the temperature of the hot flame injected into the sintering cavity, which can further increase the temperature of the sintering cavity, so that the exhaust gas will be discharged out of the flue with a higher temperature , for the subsequent denitration treatment, the denitration efficiency of the high-temperature exhaust gas in the denitration process is high, and the nitrogen oxide content in the exhaust gas discharge can meet the environmental protection standard. Superimposed on the effect of increasing the amount of pulverized coal, the temperature of the exhaust gas discharged from the flue can be increased by 10-20°C, and the denitration efficiency of the exhaust gas can be improved by 30-50%. The increased pulverized coal can also consume more oxygen in the sintering chamber, so that the oxygen content that is indispensable for the generated nitrogen oxides can be reduced, that is, the nitrogen oxide content in the exhaust gas in the sintering chamber can be reduced, which can help the exhaust gas. The emission content of nitrogen oxides reaches the environmental protection standard, which can avoid production reduction and shutdown, and can achieve greater economic and social benefits.
[0059] In a second aspect of the embodiments of the present application, a feeding control device is provided, figure 2 This is a schematic structural block diagram of a feeding control device provided in an embodiment of the present application. like figure 2 As shown, the feeding control device 1000 provided by the embodiment of the present application includes:
[0060] memory 1100, a computer program is stored in the memory 1100;
[0061] The processor 1200 is used to implement the feeding method for alumina clinker sintering according to the first aspect when the processor 1200 executes the computer program. The feeding control device can control the injection of hot flame into the sintering cavity of the alumina clinker rotary kiln, and control the injection amount of the slurry close to the flue to be smaller than the injection amount of the slurry far away from the flue.
[0062] In the feeding control device provided in the embodiment of the present application, by controlling the injection amount of slurry close to the flue to be smaller than the injection amount of slurry far from the flue, the total amount of slurry will not be affected. Compared with the prior art, the amount of slurry injected near the flue area is large, and the amount of slurry injected away from the flue area is small, which easily leads to more heat exchange near the flue area, making the temperature of the exhaust gas discharged. lower, resulting in the problem of lower denitration efficiency of the subsequent exhaust gas. The use of the alumina clinker sintering feeding control device provided in the embodiment of the present application can make less heat exchange occur in the area close to the flue, so that the temperature of the exhaust gas will not drop sharply, and the exhaust gas will be discharged with high temperature. The high-temperature exhaust gas has a high denitrification efficiency in the denitration process, which can make the nitrogen oxide content in the exhaust gas discharge meet the environmental protection standard.
[0063] A third aspect of the embodiments of the present application provides an alumina clinker rotary kiln, image 3 A schematic structural block diagram of a rotary kiln feeding alumina clinker provided in the embodiment of the present application. like image 3 As shown, the alumina clinker rotary kiln of the embodiment of the present application includes:
[0064] The feed control device 1000 as described in the second aspect. It should be noted that the feeding control device can be used as a controller to realize the control function.
[0065] In some embodiments, Figure 4 A schematic structural diagram of an alumina clinker rotary kiln provided in the embodiment of the present application. like Figure 4 As shown, the alumina clinker rotary kiln provided in the embodiment of the present application further includes: a feeding end 100, and the feeding end 100 is provided with at least two slurry spray guns 110, and the slurry spray guns 110 are connected with the feeding control device, which can It is an electrical connection or a communication connection, or a structural connection, and the feeding control device can control the operation of the slurry spray gun; the flue 200, the flue 200 is communicated with the feeding end 100; at least two slurry spray guns 110 are in turn away from the flue. 200 is provided, and the nozzle diameter of the slurry spray gun 110 close to the flue 200 is smaller than the nozzle diameter of the slurry spray gun 110 away from the flue 200 . Exemplarily, the feeding control device can control the switch of the slurry spray gun 110 or the flow rate of the slurry ejection. The adjustment of the slurry ejection flow rate can be realized by adjusting the opening degree of the baffle plate. Controlling the pumping amount of the spray pump to control the flow rate of the slurry spray gun is not specifically limited in the embodiments of the present application. The alumina clinker rotary kiln provided by the embodiment of the present application is the superposition effect of setting the nozzle diameter of the slurry spray gun and controlling the injection amount of slurry close to the flue to be smaller than the injection amount of slurry far away from the flue.
[0066] Exemplary as Figure 4 As shown, the feed end 100 is communicated with the flue 200, the slurry spray gun 110 includes a nozzle 111, and the slurry 101 is ejected from the nozzle 111. The slurry 101 may contain alumina ore, potassium powder, 40% water and other Components such as impurities and catalysts are not specifically limited in the examples of the present application. The slurry 101 exchanges heat with the hot flame in the sintering cavity 400 of the alumina clinker rotary kiln, and the exhaust gas is discharged from the flue 200. If the nozzle diameter of the slurry spray gun 110 is smaller than the nozzle diameter of the slurry spray gun 110 far away from the flue 200, the slurry sprayed from the nozzle 111 of the slurry spray gun 110 close to the flue 200 is less than that of the slurry spray gun 110 far away from the flue 200. For the slurry sprayed from the nozzles 111, the total amount of the slurry sprayed from all the slurry spray guns 110 will not be affected. Since the slurry sprayed from the slurry spray gun 110 close to the flue 200 is less than the slurry sprayed from the slurry spray gun 110 far away from the flue 200, the heat exchange in the area close to the flue 200 is less, and the heat exchange from the flue 200 is less. The exhaust gas discharged from 200 will not experience a sharp drop in temperature, and the exhaust gas will be discharged from the flue 200 with high temperature for subsequent denitration treatment. The denitration efficiency of high temperature exhaust gas in the denitration process is high. It is easy to understand that the denitration efficiency of the exhaust gas increases with the increase of the temperature. The higher the temperature of the exhaust gas, the higher the denitration efficiency, the lower the nitrogen oxide content in the exhaust gas after denitration, and the better it can meet the environmental protection standards.
[0067] In the alumina clinker rotary kiln provided by the embodiment of the present application, by setting the nozzle diameter of the slurry spray gun 110 close to the flue 200 to be smaller than the nozzle diameter of the slurry spray gun 110 away from the flue 200, the slurry spray gun close to the flue 200 The slurry sprayed by the nozzles 111 of 110 is less than the slurry sprayed by the nozzles 111 of the slurry spray guns 110 far away from the flue 200 , and the total amount of the slurry sprayed by all the slurry spray guns 110 will not be affected. Compared with the prior art, the nozzle of the slurry spray gun close to the flue area is larger, and the nozzle of the slurry spray gun far away from the flue area is smaller, which easily leads to more heat exchange near the flue area, making the temperature below the flue lower, the temperature of the exhaust gas is lower when it is discharged, resulting in the problem of lower denitration efficiency of the subsequent exhaust gas. Using the alumina clinker rotary kiln provided by the embodiment of the present application, since the slurry sprayed from the slurry spray gun 110 close to the flue 200 is less than the slurry sprayed from the slurry spray gun 110 far away from the flue 200, the slurry close to the flue is There is less heat exchange in the area of 200, so the exhaust gas discharged from the flue 200 will not experience a sharp drop in temperature, and the exhaust gas will be discharged from the flue 200 with high temperature for subsequent denitration treatment. The denitration efficiency is high, and the nitrogen oxide content in the exhaust gas can meet the environmental protection standard.
[0068] In some embodiments, the alumina clinker rotary kiln provided by the embodiments of the present application further includes: a denitration device, and the denitration device is communicated with the flue. The denitration device is used to denitrify the waste gas discharged from the flue of the alumina clinker rotary kiln, so that the nitrogen oxide content in the waste gas discharge can meet the environmental protection standard.
[0069] In some embodiments, continued reference Figure 4 , The alumina clinker rotary kiln provided by the embodiment of the present application further includes: a discharge end 300 , the discharge end 300 is arranged opposite to the feed end 100 , and the discharge end 300 includes a discharge port 310 and a hot flame inlet 320 . The sintering cavity 400 is arranged between the feeding end 100 and the discharging end 300 . The burner 500, the burner 500 generates a hot flame 510 by burning pulverized coal, and the hot flame 510 generated by the burner 500 is sprayed into the sintering cavity 400 through the hot flame inlet 320; the spray pump 600, the spray pump 600 and the slurry spray gun 110 Connected.
[0070] Exemplary as Figure 4As shown, during the operation of the alumina clinker rotary kiln, the injection pump 600 supplies the slurry 101 to the slurry injection gun 110, and the slurry injection gun 110 injects the slurry 101 into the sintering cavity 400; The hot flame 510 is sprayed into the sintering cavity 400 through the hot flame inlet 320 , the hot flame 510 and the slurry 101 exchange heat in the sintering cavity 400 , and the slurry 101 falls on the bottom of the sintering cavity 400 , and continues in the hot flame 510 Alumina clinker 102 is formed, and the alumina clinker 102 is discharged from the discharge port 310 to the sintering cavity 400 . The alumina clinker 102 is only an intermediate product of alumina production, and the alumina clinker rotary kiln is used to generate the alumina clinker 102 . Exemplarily, pulverized coal can be added to the burner 500 to increase the hot flame 510 injected into the sintering cavity 400, and the temperature of the hot flame 510 can also be increased to further increase the temperature under the flue 200, so that the exhaust gas will carry The high temperature exhaust gas is discharged from the flue 200 for subsequent denitration treatment. The high temperature exhaust gas has a high denitration efficiency in the denitration process, which can make the nitrogen oxide content in the exhaust gas discharge meet the environmental protection standard. Superimposed on the effect of increasing the amount of pulverized coal, the alumina clinker rotary kiln provided by the embodiment of the present application can increase the temperature of the exhaust gas discharge flue by 10-20°C, and can improve the denitration efficiency of the exhaust gas by 30-50%. The increased pulverized coal can also consume more oxygen in the sintering cavity 400, so that the oxygen content that is indispensable for the generated nitrogen oxides can be reduced, that is, the nitrogen oxide content in the exhaust gas in the sintering cavity can be reduced, which can help The emission content of nitrogen oxides in the exhaust gas reaches the environmental protection standard, which can avoid production reduction and shutdown, and can achieve greater economic and social benefits.
[0071] In some embodiments, the number of slurry lances is multiple, and the multiple slurry lances are divided into slurry lances arranged close to the flue, slurry lances located in the middle, and slurry lances arranged away from the flue; The set slurry spray gun, the slurry spray gun located in the middle and the slurry spray gun set away from the flue are set away from the flue in turn, and the size of the nozzle of the slurry spray gun in the middle is larger than that of the slurry spray gun set close to the flue. The nozzle size of the slurry lance in the middle is smaller than the nozzle size of the slurry lance located away from the flue.
[0072] Exemplary, continue to refer to Figure 4 , the number of the slurry spray guns 110 is multiple, and the multiple slurry spray guns 110 are divided into a slurry spray gun 11a set close to the flue, a slurry spray gun 11b located in the middle and a slurry spray gun 11c set away from the flue; The slurry spray gun 11a arranged in the middle, the slurry spray gun 11b located in the middle and the slurry spray gun 11c arranged away from the flue are arranged away from the flue 200 in turn. The nozzle size of the spray gun 11a and the nozzle size of the slurry spray gun 11b located in the middle are smaller than the nozzle size of the slurry spray gun 11c disposed away from the flue 200 . That is, the nozzle sizes of the slurry spray gun 11a located close to the flue, the slurry spray gun 11b located in the middle, and the slurry spray gun 11c located far from the flue are sequentially increased to ensure the total amount of the slurry 101 sprayed from the slurry spray gun 110. The amount remains unchanged, which makes the slurry 101 sprayed from the slurry spray gun 110 close to the flue 200 less.
[0073] The alumina clinker rotary kiln provided by the embodiment of the present application is provided with a plurality of slurry spray guns 110, and the plurality of slurry spray guns 110 are divided into three nozzle sizes, upper, middle and lower. The size of the nozzle is larger, and the size of the nozzle in the middle is centered, so that the size of the nozzle from close to the flue to far from the flue gradually increases, so that the temperature from the position close to the flue to the position far from the flue is gradually reduced under the action of heat exchange, so that the It is ensured that the temperature near the flue area remains high, and finally the exhaust gas discharged from the flue has a high temperature, which is beneficial to the efficiency of subsequent denitration treatment, so as to ensure that the nitrogen oxide content of the exhaust gas meets the environmental protection standard.
[0074] In some embodiments, Figure 5 A schematic diagram of the arrangement and layout of a slurry spray gun on a plane perpendicular to the slurry spraying direction provided in the embodiment of the present application. combine Figure 4 and Figure 5 , the number of slurry spray guns 110 is 3, and the three slurry spray guns are arranged in a triangle; wherein, one slurry spray gun 110 is set close to the flue 200 relative to the other two slurry spray guns 110, and a material set close to the flue 200 The nozzle diameter of the slurry spray gun 11 a is smaller than the nozzle diameter of the two slurry spray guns 11 c disposed away from the flue 200 .
[0075] In some embodiments, Image 6 A schematic diagram of the arrangement and layout of another slurry spray gun on a plane perpendicular to the slurry spraying direction provided in the embodiment of the present application. combine Figure 4 and Image 6 , the number of slurry spray guns 110 is 4, and the four slurry spray guns 110 are arranged in a quadrilateral; wherein, two slurry spray guns 110 are arranged close to the flue 200 relative to the other two slurry spray guns 110, and two slurry spray guns 110 close to the flue 200. The nozzle diameter of each slurry spray gun 11 a is smaller than the nozzle diameter of the two slurry spray guns 11 c away from the flue 200 .
[0076] In some embodiments, Figure 7 A schematic diagram of the arrangement and layout of another slurry spray gun on a plane perpendicular to the slurry spraying direction provided in the embodiment of the present application. combine Figure 4 and Figure 7 , the number of slurry spray guns 110 is three, and the three slurry spray guns 110 are arranged in a straight line; The number of the slurry spray guns 11c is one, respectively.
[0077] In some embodiments, Figure 8 A schematic diagram of the arrangement and layout of still another slurry spray gun on a plane perpendicular to the slurry spray direction provided in the embodiment of the present application. combine Figure 4 and Figure 8 , the number of slurry spray guns 110 is 4, and the four slurry spray guns 110 are arranged in a quadrangular shape; wherein, the number of slurry spray guns 11a arranged near the flue 200 is 1, and the number of slurry spray guns 11b located in the middle is 2 The number of slurry spray guns 11c disposed far away from the flue 200 is one.
[0078] In some embodiments, Figure 9 A schematic diagram of the arrangement and layout of a slurry spray gun on a plane perpendicular to the slurry spraying direction provided in the embodiment of the present application. combine Figure 4 and Figure 9 , the number of slurry spray guns 110 is 5; wherein, the number of slurry spray guns 11a set close to the flue 200 is 1, the number of slurry spray guns 11b located in the middle is 3, and the number of slurry spray guns set far from the flue 200 is 1 The number of the spray guns 11c is one.
[0079] Figure 5-Figure 9 The shown number and arrangement of the slurry spray guns 110 are only illustrative, and are not intended to be specifically limited in the present application.
[0080] In some embodiments, an atomizer is provided in the slurry lance away from the flue; no atomizer is provided in the slurry lance close to the flue.
[0081] In the alumina clinker rotary kiln provided by the embodiment of the present application, the atomizer can be used to disperse the slurry, and the contact area of the dispersed slurry with the hot flame, or the contact area with the high-temperature air flow is increased, which can enhance the thermal Therefore, the slurry spray gun close to the flue is not provided with an atomizer, and the slurry spray gun far away from the flue is provided with an atomizer, which can further reduce the heat exchange in the area close to the flue and further increase the temperature below the flue 200. , so that the exhaust gas will be discharged from the flue 200 with high temperature for subsequent denitration treatment. The high temperature exhaust gas has a high denitration efficiency in the denitration process, which can make the nitrogen oxide content in the exhaust gas discharge meet the environmental protection standard.
[0082] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiment", etc. means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in this application at least one embodiment or example of . In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
[0083] While the preferred embodiments of this specification have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of this specification.
[0084] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, provided that these modifications and variations of the present specification fall within the scope of the claims of the present specification and their technical equivalents, the present specification is also intended to include these modifications and variations.
