Cement production device and method for reducing energy loss on kiln shell surface

Abstract

The invention discloses a cement production device and a method for reducing energy consumption loss on the surface of a kiln barrel, belonging to the technical field of waste heat utilization of cement kilns, and aims at the problem of reduced utilization rate of heat at the kiln head and the surface heat of the kiln barrel of a rotary kiln in cement production. The device comprises a rotary kiln and a grate cooler, wherein a flue gas duct is connected between the rotary kiln and the grate cooler, a preheating duct is connected to the side of the rotary kiln away from the flue gas duct, and a quenching pipe, a waste heat duct and a cooling duct distributed in sequence are connected to the top surface of the grate cooler; the high-temperature flue gas generated by the rotary kiln of the invention enters the quenching pipe, the waste heat duct and the cooling duct in the grate cooler and is respectively transported to a preheater, a boiler and a waste heat power generation AQC furnace for reuse; the flue gas generated by cooling is subjected to dust removal by an electrostatic precipitator, SCR denitrification, boiler preheating heating, cooler cooling and dust removal at the kiln tail by a flue gas preheating treatment mechanism, a flue gas waste heat utilization mechanism and a flue gas circulation mechanism, and is finally purified and sent to the waste heat power generation AQC furnace for reuse.

Description

Technical Field

[0001] The present invention belongs to the technical field of cement kiln waste heat utilization, and in particular relates to a cement production device and method for reducing energy loss on the surface of a kiln cylinder. Background Art

[0002] In the cement production process, heat consumption is the main indicator for judging the technological advancement of the firing system; the heat of clinker formation mainly depends on the raw material composition, and the heat of clinker formation can be reduced by optimizing the raw material batching; the sensible heat of the exhaust gas at the preheater outlet mainly depends on the outlet exhaust gas volume and temperature. At present, by optimizing the preheater configuration, reducing coal consumption, reducing exhaust gas volume, improving heat exchange efficiency, and reducing outlet exhaust gas temperature, the outlet exhaust gas heat loss is reduced; the surface heat dissipation of the system depends on the surface area and surface temperature of the system. Under the existing process conditions, by optimizing the internal insulation of the system, reducing heat transfer, or by increasing the unit volume output, the system surface heat dissipation loss per unit clinker can be reduced; the heat loss at the kiln head is concentrated in the kiln head grate cooler system. In addition to the heat taken away by the clinker leaving the grate cooler and the surface heat dissipation, it mainly includes the heat taken away by the residual air of the grate cooler. At present, the heat loss of the residual air at the kiln head is mainly reduced by recovering heat through secondary air and tertiary air, and by utilizing heat through the coal mill system and waste heat power generation system.

[0003] The waste heat of the flue gas at the kiln head comes from the cooling process of the clinker. The temperature of the clinker leaving the rotary kiln reaches 1300-1400℃. It is unloaded from the kiln mouth onto the grate bed of the grate cooler and distributed along the entire length of the grate bed to form a material bed of a certain thickness. The cooling air blows upward from the bottom of the material bed into the material layer, penetrates and diffuses, and cools the hot clinker; the head of the grate cooler completes the maximum rapid cooling and can obtain higher secondary and tertiary air temperatures. The middle part must ensure that the head and middle parts can achieve a cooling effect of more than 90% by adjusting the air volume, and the tail part must not be subjected to excessive cooling load; the tail air volume can be as little as possible to ensure the clinker cooling effect and the negative pressure of the kiln head. After cooling the clinker, the cooling air becomes hot air. The hot air from the head of the grate cooler is used as secondary air and tertiary air to be sent to the rotary kiln and decomposition furnace for combustion support respectively. The exhaust gas temperature in the middle of the grate cooler is about 350-500℃, which can be used as a drying heat source to enter the coal mill system, or enter the kiln head waste heat boiler for power generation. After completing the heat exchange, it is combined with the exhaust gas at the tail of the grate cooler. The flue gas temperature drops to about 90-100℃ and enters the kiln head dust collector. After meeting the standards, it is discharged into the atmosphere through the kiln head chimney by the induced draft fan. It can be seen that the temperature of the exhaust air discharged after the kiln head exhaust gas is recovered by waste heat power generation is still around 90-100℃. This part of heat energy is not utilized to the maximum extent. Direct discharge causes thermal enthalpy loss of the system. At this time, the following defects are prone to occur:

[0004] ① The temperature of the waste air discharged from the kiln after heat recovery by waste heat power generation is still around 90-100℃. This part of the heat energy is not utilized to the maximum extent, and direct discharge causes heat enthalpy loss in the system;

[0005] ② As a clinker calcining equipment, the rotary kiln can reach a temperature of about 300°C on the outer surface of the kiln shell during operation. A large amount of heat is dissipated into the environment through the surface of the kiln shell in the form of radiation heat dissipation, which not only causes thermal pollution to the environment, but also causes heat loss.

[0006] Therefore, a cement production device and method for reducing energy loss on the surface of the kiln shell are needed to solve the problem of reduced utilization of heat at the kiln head and the surface heat of the kiln shell in the prior art for cement production. Summary of the Invention

[0007] The object of the present invention is to provide a cement production device and method for reducing energy loss on the surface of a kiln shell, so as to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A cement production device for reducing energy loss on the surface of a kiln shell, comprising a rotary kiln and a grate cooler, wherein a flue gas duct is connected between the rotary kiln and the grate cooler, a preheating duct is connected to the side of the rotary kiln away from the flue gas duct, a quenching pipe, a waste heat duct and a cooling duct distributed in sequence are connected to the top surface of the grate cooler, a flue gas preheating treatment mechanism is arranged between the quenching pipe and the preheating duct, a flue gas waste heat utilization mechanism connected to the flue gas preheating treatment mechanism is arranged between the flue gas duct and the waste heat duct, and a flue gas circulation mechanism coordinated with the cooling duct is arranged on one side of the flue gas waste heat utilization mechanism.

[0009] It should be noted in the scheme that the flue gas preheating treatment mechanism includes a preheater connected to both the quenching pipe and the preheating pipe, a high-temperature electrostatic precipitator is provided on one side of the preheater, the high-temperature electrostatic precipitator is connected to the top of the preheater by a pipe a, and an SCR denitrification reactor is connected to one side of the high-temperature electrostatic precipitator.

[0010] It is further worth noting that the flue gas waste heat utilization mechanism includes a bypass duct connected to the flue gas duct, and the bypass duct and the top of the waste heat duct are commonly connected to a mixer. The top center of the mixer is connected to a duct b, and the end of the duct b is connected to a boiler. A duct c is connected between the boiler and the SCR denitrification reactor. A cold water pipe is passed through the interior of the mixer, and the top of the cold water pipe is connected to the top of the boiler.

[0011] It should be further explained that the flue gas circulation mechanism includes a waste heat power generation AQC furnace connected to a cooling duct, a cooler is provided on one side of the boiler, a high-temperature fan a is connected between one side of the bottom of the cooler and the boiler, and a high-temperature fan b is connected to the other side of the bottom of the cooler and the top side of the waste heat power generation AQC furnace. A kiln tail dust collector is provided on the outside of the cooler and the waste heat power generation AQC furnace, and one side of the kiln tail dust collector is connected to the cooler and the waste heat power generation AQC furnace with a duct d and a duct e respectively. The bottom side of the waste heat power generation AQC furnace is connected to an exhaust fan, and a return pipe is provided between the waste heat power generation AQC furnace and the exhaust fan.

[0012] As a preferred embodiment, a filter column is fixed to the inner wall of the preheater, and is distributed in sequence between the quenching tube and the preheating tube.

[0013] As a preferred embodiment, the preheater and the bottom end of the SCR denitration reactor are both connected to a waste collecting conduit, a waste collecting chamber is provided on one side of the rotary kiln, and a delivery pump is provided between the waste collecting conduit and the waste collecting chamber.

[0014] As a preferred embodiment, a side of the boiler away from the cold water pipe is connected to a water inlet pipe, and the water inlet pipe and the cold water pipe are symmetrically arranged along the center of the boiler.

[0015] A method for using a cement production device for reducing energy loss on the surface of a kiln shell comprises the following steps:

[0016] S1. Rapid cooling and preheating flue gas treatment: Part of the high-temperature flue gas generated by the rotary kiln enters the preheater through the preheating conduit. At the same time, the flue gas that enters the grate cooler through the flue gas conduit for rapid cooling enters the preheater through the rapid cooling pipe. The high-temperature flue gas in the preheater is neutralized and cooled, and maintained at a suitable high temperature. It then enters the high-temperature electrostatic precipitator from conduit a for preliminary dust removal, and finally enters the SCR denitrification reactor for dust removal and denitrification.

[0017] S2. Waste Heat Utilization and Flue Gas Treatment: The flue gas that has been rapidly cooled and cooled in the grate cooler and that has retained residual heat, as well as the flue gas that has passed through the bypass duct in the flue gas duct, are neutralized and cooled in the mixer. This can not only preheat the cold water in the cold water pipe passing through the mixer, but also be passed to the bottom of the boiler for thermal processing. Simultaneously, the flue gas that has been dust-removed and denitrified in step S1 can enter the boiler, thereby heating the cold water in the boiler.

[0018] S3. Flue gas recycling and treatment: The flue gas transported in the cooling duct in the grate cooler enters the waste heat power generation AQC furnace for waste heat power generation treatment. The high-temperature flue gas generated is partially sent to the cooler through the high-temperature fan b. At the same time, the high-temperature flue gas generated in the boiler is sent to the cooler through the high-temperature fan a for convergence cooling treatment. The flue gas cooled in the cooler and the high-temperature flue gas generated in the waste heat power generation AQC furnace enter the kiln tail dust collector through the duct d and the duct e respectively for dust removal. The flue gas after dust removal continues to enter the waste heat power generation AQC furnace through the exhaust fan for preheating treatment, thereby forming a flue gas recycling.

[0019] Compared with the prior art, the present invention provides a cement production device and method for reducing energy loss on the surface of a kiln shell, which has at least the following beneficial effects:

[0020] (1) The high-temperature flue gas generated by the rotary kiln enters the quenching pipe, waste heat pipe and cooling pipe in the grate cooler and is respectively transported to the preheater, boiler and waste heat power generation AQC furnace for reuse, and the flue gas generated by its cooling is respectively subjected to the flue gas preheating treatment mechanism, the flue gas waste heat utilization mechanism and the flue gas circulation mechanism for electrostatic precipitator dust removal, SCR denitrification, boiler preheating heating, cooler cooling and kiln tail dust removal, and finally purified and sent to the waste heat power generation AQC furnace for reuse, thereby effectively reducing the emission of high-temperature flue gas generated by the rotary kiln, greatly improving the waste heat utilization effect, and thus saving energy consumption to a certain extent.

[0021] (2) Part of the high-temperature flue gas generated by the rotary kiln enters the preheater through the preheating duct. At the same time, the flue gas that enters the grate cooler through the flue gas duct for rapid cooling enters the preheater through the rapid cooling pipe. The high-temperature flue gas in the preheater is neutralized and cooled, and maintained at a suitable high temperature, thereby saving the energy consumption required for the preheater to generate waste heat and improving the utilization rate of the high-temperature flue gas in the rotary kiln.

[0022] (3) The flue gas with residual heat after rapid cooling in the grate cooler and the flue gas passing through the bypass duct in the flue gas duct are neutralized and cooled in the mixer. This can not only preheat the cold water in the cold water pipe passing through the mixer, but also pass it into the bottom of the boiler for heat processing. At the same time, the flue gas that has been dust-removed and denitrified can enter the boiler, thereby heating the cold water in the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of the system flow of the present invention;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the preheater of the present invention;

[0025] Figure 3 This is a schematic diagram of the filter cartridge structure from a top view of the present invention;

[0026] Figure 4 It is a schematic diagram of the method flow structure of the present invention.

[0027] Figure: 1, rotary kiln; 2, grate cooler; 3, flue gas duct; 4, preheating duct; 5, quenching pipe; 6, waste heat duct; 7, cooling duct; 8, flue gas preheating treatment mechanism; 801, preheater; 802, high-temperature electrostatic precipitator; 803, SCR denitrification reactor; 804, duct a; 9, flue gas waste heat utilization mechanism; 901, bypass duct; 902, mixer; 903, duct b; 904, boiler; 905, duct Pipe c; 906, cold water pipe; 10, flue gas circulation mechanism; 1001, waste heat power generation AQC furnace; 1002, cooler; 1003, high-temperature fan a; 1004, high-temperature fan b; 1005, kiln tail dust collector; 1006, duct d; 1007, duct e; 1008, exhaust fan; 1009, return pipe; 11, filter column; 12, waste collection duct; 13, waste collection chamber; 14, delivery pump; 15, water inlet pipe. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the embodiments.

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The following examples are intended to illustrate the present invention but are not intended to limit the scope of protection of the present invention. The conditions in the examples may be further adjusted according to specific conditions. Simple improvements to the method of the present invention within the scope of the present invention are also within the scope of protection claimed in the present invention.

[0031] See also Figure 1-4 The present invention provides a cement production device for reducing energy loss on the surface of a kiln shell, comprising a rotary kiln 1 and a grate cooler 2. A flue gas duct 3 is connected between the rotary kiln 1 and the grate cooler 2. A preheating duct 4 is connected to the side of the rotary kiln 1 away from the flue gas duct 3. A quenching pipe 5, a waste heat duct 6 and a cooling duct 7 are connected to the top surface of the grate cooler 2, which are distributed in sequence. A flue gas preheating treatment mechanism 8 is provided between the quenching pipe 5 and the preheating duct 4. A flue gas waste heat utilization mechanism 9 connected to the flue gas preheating treatment mechanism 8 is provided between the flue gas duct 3 and the waste heat duct 6. A flue gas circulation mechanism 10 coordinated with the cooling duct 7 is provided on one side of the flue gas waste heat utilization mechanism 9.

[0032] Further as Figure 1 As shown, it is worth mentioning that the flue gas preheating treatment mechanism 8 includes a preheater 801 connected to both the quenching pipe 5 and the preheating pipe 4, a high-temperature electrostatic precipitator 802 is provided on one side of the preheater 801, the high-temperature electrostatic precipitator 802 is connected to the top of the preheater 801 by a pipe a804, and an SCR denitrification reactor 803 is connected to one side of the high-temperature electrostatic precipitator 802.

[0033] Further as Figure 1 As shown, it is worth mentioning that the flue gas waste heat utilization mechanism 9 includes a bypass duct 901 connected to the flue gas duct 3, and the bypass duct 901 and the top of the waste heat duct 6 are commonly connected to a mixer 902. The top center of the mixer 902 is connected to a duct b903, and the end of the duct b903 is connected to the boiler 904. The boiler 904 and the SCR denitrification reactor 803 are connected by a duct c905. A cold water pipe 906 is passed through the interior of the mixer 902, and the top of the cold water pipe 906 is connected to the top of the boiler 904.

[0034] Further as Figure 1 As shown, it is worth mentioning that the flue gas circulation mechanism 10 includes a waste heat power generation AQC furnace 1001 connected to the cooling duct 7, a cooler 1002 is provided on one side of the boiler 904, a high-temperature fan a1003 is connected between the bottom side of the cooler 1002 and the boiler 904, and a high-temperature fan b1004 is connected between the other side of the bottom of the cooler 1002 and the top side of the waste heat power generation AQC furnace 1001, a kiln tail dust collector 1005 is provided on the outside of the cooler 1002 and the waste heat power generation AQC furnace 1001, and one side of the kiln tail dust collector 1005 is respectively connected to the cooler 1002 and the waste heat power generation AQC furnace 1001 by a duct d1006 and a duct e1007, an exhaust fan 1008 is connected to the bottom side of the waste heat power generation AQC furnace 1001, and a return pipe 1009 is provided between the return pipe 1009 and the kiln tail dust collector 1005.

[0035] Further as Figure 2 and Figure 3 As shown, it is worth mentioning that a filter column 11 is fixed to the inner wall of the preheater 801, and is distributed in sequence between the quenching pipe 5 and the preheating conduit 4. The arrangement of the positions of the filter column 11, the quenching pipe 5 and the preheating conduit 4 facilitates the rapid neutralization and cooling of the lower temperature flue gas transported from the quenching pipe 5 and the high temperature air entering from the preheating conduit 4, and performs preliminary filtration of the flue gas through the filter column 11, and maintains a high temperature before entering the high temperature electrostatic precipitator 802 for dust removal.

[0036] Further as Figure 1As shown, it is worth mentioning that the bottom ends of the preheater 801 and the SCR denitration reactor 803 are both connected to a waste collecting duct 12, a waste collecting chamber 13 is provided on one side of the rotary kiln 1, and a delivery pump 14 is provided between the waste collecting duct 12 and the waste collecting chamber 13, wherein the delivery pump 14 delivers the debris generated in the preheater 801 and the SCR denitration reactor 803 into the waste collecting chamber 13 through the delivery pump 14 for centralized treatment.

[0037] Further as Figure 1 As shown, it is worth noting that the side of the boiler 904 away from the cold water pipe 906 is connected to the water inlet pipe 15, and the water inlet pipe 15 and the cold water pipe 906 are symmetrically arranged along the center of the boiler 904.

[0038] Further as Figure 4 As shown, it is worth specifically explaining that a method for using a cement production device for reducing energy loss on the surface of a kiln shell comprises the following steps:

[0039] S1. Rapid cooling and preheating flue gas treatment: Part of the high-temperature flue gas generated by the rotary kiln 1 enters the preheater 801 through the preheating conduit 4. At the same time, the flue gas that enters the grate cooler 2 through the flue gas conduit 3 for rapid cooling enters the preheater 801 through the quenching pipe 5. The high-temperature flue gas in the preheater 801 is neutralized and cooled, and maintained at a suitable high temperature. It then enters the high-temperature electrostatic precipitator 802 through the conduit a804 for preliminary dust removal, and then enters the SCR denitration reactor 803 for dust removal and denitration.

[0040] S2. Waste Heat Utilization for Flue Gas Treatment: The flue gas that has been rapidly cooled and cooled in the grate cooler 2 and the flue gas that has passed through the bypass duct 901 in the flue gas duct 3 are neutralized and cooled in the mixer 902. This can not only preheat the cold water in the cold water pipe 906 passing through the mixer 902, but also be passed to the bottom of the boiler 904 for thermal processing. At the same time, the flue gas that has been dust-removed and denitrified can enter the boiler 904, thereby heating the cold water in the boiler 904.

[0041] S3. Flue gas recycling and treatment: The flue gas transported in the cooling duct 7 in the grate cooler 2 enters the waste heat power generation AQC furnace 1001 for waste heat power generation treatment. The high-temperature flue gas generated is partially sent to the cooler 1002 through the high-temperature fan b1004. At the same time, the high-temperature flue gas generated in the boiler 904 is sent to the cooler 1002 through the high-temperature fan a1003 for convergence cooling treatment. The flue gas cooled in the cooler 1002 and the high-temperature flue gas generated in the waste heat power generation AQC furnace 1001 enter the kiln tail dust collector 1005 through the duct d1006 and the duct e1007 respectively for dust removal. The flue gas after dust removal continues to enter the waste heat power generation AQC furnace 1001 through the exhaust fan 1008 for preheating treatment, thereby forming a flue gas recycling.

[0042] In summary, during the cement production process, the high-temperature flue gas generated by the rotary kiln 1 enters the quenching pipe 5, the waste heat pipe 6 and the cooling pipe 7 in the grate cooler 2 and is respectively transported to the preheater 801, the boiler 904 and the waste heat power generation AQC furnace 1001 for reuse. The flue gas generated by its cooling is respectively subjected to the flue gas preheating treatment mechanism 8, the flue gas waste heat utilization mechanism 9 and the flue gas circulation mechanism 10 for electrostatic precipitator dust removal, SCR denitrification, boiler 904 preheating heating, cooler 1002 cooling and kiln tail dust removal, and is finally purified and sent to the waste heat power generation AQC furnace 1001 for reuse, thereby effectively reducing the emission of high-temperature flue gas generated by the rotary kiln, greatly improving the waste heat utilization effect, and thus saving energy consumption to a certain extent.

[0043] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the ordinary meaning understood by persons having ordinary skills in the field to which the present invention belongs. The words "include" or "comprise" and the like used in the present invention mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. The words "connect" or "connected" and the like are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. The words "up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0044] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A cement production device for reducing energy loss on the surface of a kiln shell, comprising a rotary kiln (1) and a grate cooler (2), characterized in that: A flue gas duct (3) is connected between the rotary kiln (1) and the grate cooler (2); a preheating duct (4) is connected to the side of the rotary kiln (1) away from the flue gas duct (3); a quenching pipe (5), a waste heat duct (6) and a cooling duct (7) are connected to the top surface of the grate cooler (2); a flue gas preheating treatment mechanism (8) is provided between the quenching pipe (5) and the preheating duct (4); a flue gas waste heat utilization mechanism (9) connected to the flue gas preheating treatment mechanism (8) is provided between the flue gas duct (3) and the waste heat duct (6); and a flue gas circulation mechanism (10) matched with the cooling duct (7) is provided on one side of the flue gas waste heat utilization mechanism (9); The flue gas preheating treatment mechanism (8) includes a preheater (801) connected to both the quenching pipe (5) and the preheating conduit (4); a high-temperature electrostatic precipitator (802) is provided on one side of the preheater (801); a conduit a (804) is connected between the high-temperature electrostatic precipitator (802) and the top end of the preheater (801); and an SCR denitrification reactor (803) is connected to one side of the high-temperature electrostatic precipitator (802); The flue gas waste heat utilization mechanism (9) includes a bypass conduit (901) connected to the flue gas conduit (3), the bypass conduit (901) and the top of the waste heat conduit (6) are commonly connected to a mixer (902), the center of the top of the mixer (902) is connected to a conduit b (903), the end of the conduit b (903) is connected to a boiler (904), a conduit c (905) is connected between the boiler (904) and the SCR denitration reactor (803), a cold water pipe (906) is passed through the interior of the mixer (902), and the top of the cold water pipe (906) is connected to the top of the boiler (904); The flue gas circulation mechanism (10) includes a waste heat power generation AQC furnace (1001) connected to a cooling duct (7), a cooler (1002) is provided on one side of the boiler (904), a high-temperature fan a (1003) is connected between one side of the bottom of the cooler (1002) and the boiler (904), a high-temperature fan b (1004) is connected between the other side of the bottom of the cooler (1002) and the top side of the waste heat power generation AQC furnace (1001), and the cooler (1002) and the waste heat power generation AQC furnace (1001) are connected. A kiln tail dust collector (1005) is provided on the outside of the thermal power generation AQC furnace (1001); a conduit d (1006) and a conduit e (1007) are respectively connected between one side of the kiln tail dust collector (1005) and the cooler (1002) and the waste heat power generation AQC furnace (1001); an exhaust fan (1008) is connected to one side of the bottom of the waste heat power generation AQC furnace (1001); and a return pipe (1009) is provided between the waste heat power generation AQC furnace (1001) and the exhaust fan (1008).

2. A cement production device for reducing energy loss on the surface of a kiln shell according to claim 1, characterized in that: A filter column (11) is fixed to the inner wall of the preheater (801), and the quenching tube (5) and the preheating tube (4) are sequentially distributed in an upper and lower direction.

3. The cement production device for reducing energy loss on the kiln shell surface according to claim 2, characterized in that: The bottom ends of the preheater (801) and the SCR denitration reactor (803) are both connected to a waste collecting conduit (12), a waste collecting chamber (13) is provided on one side of the rotary kiln (1), and a delivery pump (14) is provided between the waste collecting conduit (12) and the waste collecting chamber (13).

4. A cement production device for reducing energy loss on the kiln shell surface according to claim 3, characterized in that: A water inlet pipe (15) is connected to the side of the boiler (904) away from the cold water pipe (906), and the water inlet pipe (15) and the cold water pipe (906) are symmetrically arranged along the center of the boiler (904).

5. A method for using the cement production device for reducing energy loss on the surface of a kiln shell according to any one of claims 1 to 4, characterized in that: It includes the following steps: S1. Rapid cooling and preheating flue gas treatment: Part of the high-temperature flue gas generated by the rotary kiln (1) enters the preheater (801) through the preheating conduit (4). At the same time, the flue gas that enters the grate cooler (2) through the flue gas conduit (3) for rapid cooling enters the preheater (801) through the rapid cooling pipe (5). The high-temperature flue gas in the preheater (801) is neutralized and cooled, and maintained at a suitable high temperature. The flue gas then enters the high-temperature electrostatic precipitator (802) from the conduit a (804) for preliminary dust removal, and then enters the SCR denitrification reactor (803) for dust removal and denitrification. S2. Waste heat utilization flue gas treatment: The flue gas that has been rapidly cooled and cooled in the grate cooler (2) and the flue gas that has passed through the bypass duct (901) in the flue gas duct (3) are neutralized and cooled in the mixer (902). This can not only preheat the cold water in the cold water pipe (906) that has passed through the mixer (902), but also pass it into the bottom of the boiler (904) for heat treatment. At the same time, the flue gas that has been dust-removed and denitrified in step S1 can enter the boiler (904), thereby heating the cold water in the boiler (904); S3. Flue gas recycling treatment: The flue gas transported in the cooling duct (7) in the grate cooler (2) enters the waste heat power generation AQC furnace (1001) for waste heat power generation treatment. The generated high-temperature flue gas is partially sent to the cooler (1002) through the high-temperature fan b (1004). At the same time, the high-temperature flue gas generated in the boiler (904) is sent to the cooler (1002) through the high-temperature fan a (1003) for convergence cooling treatment. The flue gas cooled in the cooler (1002) and the high-temperature flue gas generated in the waste heat power generation AQC furnace (1001) enter the kiln tail dust collector (1005) through the duct d (1006) and the duct e (1007) respectively for dust removal. The flue gas after dust removal continues to enter the waste heat power generation AQC furnace (1001) through the exhaust fan (1008) for preheating treatment, thereby forming a flue gas recycling.

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