A rotary kiln off-gas treatment system

Abstract

The application discloses a rotary kiln tail gas treatment system, which comprises a rotary kiln shell, the rotary kiln shell is internally provided with a preheating zone for preheating, a sintering zone for transformation sintering and a cooling zone for cooling forming, the sintering zone is internally provided with an independent acidizing sintering chamber for sulfuric acid sintering, the rotary kiln shell is internally provided with a gas intercommunication assembly for attracting tail gas, the gas intercommunication assembly comprises a pressure conveying inner plate, a plurality of first built-in rods, a plurality of second built-in rods and a plurality of air passing sleeves; the particulates in the tail gas are concentrated in a particle collecting and screening cavity, the cooling gas generated in the cooling zone enters the second built-in rods and flows to the sintering zone to change the temperature, the transformation sintering and the acidizing sintering of the materials are carried out in one kiln body, the production environment is utilized, meanwhile, the temperature in the preheating zone and the sintering zone can be assistedly controlled in the process that the tail gas flows to a tail gas purification flue, and the particulates in the tail gas are removed.

Description

TECHNICAL FIELD

[0001] The present application relates to a rotary kiln tail gas treatment technology field, and particularly relates to a rotary kiln tail gas treatment system. BACKGROUND

[0002] Lithium carbonate is an inorganic compound, and its production process is to mix spodumene and sulfate in a rotary kiln for sintering production. The metal elements in the added sulfate replace lithium in the ore to generate soluble sulfate after a series of physical and chemical reactions. The material slowly advances from the high end to the low end of the rotary kiln with a certain slope under continuous rotation, and natural gas is sprayed. Combustion occurs in the kiln, and heat is absorbed by the material. Physical and chemical changes occur in the material at high temperatures, and the material is calcined into finished products. Then the material is discharged from the rotary kiln. Due to combustion and heat generation in the presence of air, high-temperature flue gas is generated. The hot gas moves from the natural end to the next end under the drive of the fan. The material and flue gas exchange heat during the reverse movement, so that the raw material is burned into clinker. Spodumene transformation roasting and acidification roasting are both carried out in a rotary kiln. In the process of transformation roasting, the clinker temperature needs to be reduced from 900 DEG C to 60 DEG C, and tail gas needs to be discharged. Then the material is sent to a 250 DEG C acidification rotary furnace for sulfuric acid roasting, and acidification tail gas is discharged. The material produced needs to be converted between transformation roasting and acidification roasting. The position needs to be changed and the temperature needs to be controlled during the conversion process. The utilization rate of the material production environment in the kiln is low. SUMMARY

[0003] The present application aims to provide a rotary kiln tail gas treatment system. The transformation roasting and acidification roasting of the material are carried out in one kiln body. The production environment is utilized. The temperature in the preheating zone and the burning zone can be controlled during the flow of the tail gas to the tail gas purification smoke chamber. The particulate matter in the tail gas can be removed. The problems in the background art can be effectively solved.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0005] A rotary kiln tail gas treatment system, comprising a rotary kiln shell, the rotary kiln shell has a preheating zone for preheating, a sintering zone for transformation sintering and a cooling zone for cooling forming inside, the sintering zone has an independent acidizing sintering chamber for sulfuric acid sintering, the rotary kiln shell is provided with a gas intercommunication assembly for attracting tail gas inside, the gas intercommunication assembly comprises a pressure conveying inner plate, a plurality of first built-in rods, a plurality of second built-in rods and a plurality of air passing sleeves, the tail gas in the sintering zone enters the first built-in rods to sieve out particulate matters and flows to the preheating zone, the tail gas in the independent acidizing sintering chamber enters the second built-in rods to sieve out particulate matters and flows to the sintering zone, and the cooling gas in the cooling zone enters the second built-in rods and flows to the sintering zone.

[0006] As a further scheme of the present application, the independent acidizing sintering chamber has passages for entering and discharging materials on both sides, and is wrapped with a heat insulation layer outside; transformation sintering and acidizing sintering of materials are carried out in one kiln body, and through rotation of the rotary kiln shell, materials can enter the independent acidizing sintering chamber through the passages for acidizing sintering, or be discharged from the passages.

[0007] As a further scheme of the present application, heat carried by sintering tail gas and transformation clinker in the sintering zone is attracted by circulating water, and one end of the rotary kiln shell is sealingly connected with a tail gas purification flue, tail gas generated by the preheating zone, the sintering zone and the independent acidizing sintering chamber is discharged into the tail gas purification flue through the first built-in rods and the second built-in rods; the circulating water is circulated in a separate circulating pipeline, the pipeline is arranged at a position corresponding to a shunt rod capable of being arranged on the first built-in rod to enter the tail gas purification flue, the tail gas enters the tail gas purification flue for precooling, the shunt rod is arranged on the second built-in rod and the first built-in rod, the tail gas is introduced into the first built-in rod through the second built-in rod, and the shunt rod capable of being arranged on the first built-in rod to enter the tail gas purification flue is arranged, so that the tail gas is treated after being used.

[0008] As a further scheme of the present application, the pressure conveying inner plate has an opening through which materials pass, and the pressure conveying inner plate has an attracting cavity and a pressure cavity for being controlled by a fan inside, the first built-in rods and the second built-in rods are fixedly connected with the pressure conveying inner plate, and the pressure conveying inner plate is rotationally connected in the rotary kiln shell; the pressure conveying inner plate does not block the materials, attracting air or pushing air is generated through the attracting cavity or the pressure cavity, the position of the tail gas is changed or the position of the pressure conveying inner plate is changed, liquid or gas is filled, and the first built-in rods and the second built-in rods are flushed.

[0009] As a further scheme of the present application: several ventilation sleeves are sliding in the first and second built-in rods, the ventilation sleeves in the first and second built-in rods are in a symmetrical state; the first and second built-in rods act simultaneously, and the positions distributed thereby are opposite to different sections of the firing zone, i.e. the tail gas generated at different positions of the rotary kiln shell is treated.

[0010] As a further scheme of the present application: the ventilation sleeve is in a conical shape, and a particle collecting and screening cavity for collecting tail gas particles is formed between the outer wall of the ventilation sleeve and the inner walls of the first and second built-in rods; the gas flows in the ventilation sleeve, and due to the effect of the shape of the ventilation sleeve, the gas flows in the hole of the ventilation sleeve, and under the blocking effect of the ventilation sleeve, the particles in the tail gas are concentrated in the particle collecting and screening cavity.

[0011] As a further scheme of the present application: the several ventilation sleeves in the first built-in rod are connected by a position control rod, one end of the position control rod penetrates through the rotary kiln shell and extends to the outside of the rotary kiln shell; the position control rod is connected by an electric drive structure, so that the position control rod moves horizontally, and the position control rod pulls the plurality of ventilation sleeves to move in the first built-in rod; at the end extending to the outside of the rotary kiln shell, a water washing tank can be connected, so that the position control rod and the ventilation sleeves can enter the inside of the water washing tank to treat the particles in the particle collecting and screening cavity.

[0012] As a further scheme of the present application: the several ventilation sleeves in the second built-in rod are connected by a position control rod, one end of the position control rod penetrates through the tail gas purification flue and extends to the outside of the tail gas purification flue; the position control rod is connected by an electric drive structure, so that the position control rod moves horizontally, and the position control rod pulls the plurality of ventilation sleeves to move in the second built-in rod; at the end extending to the outside of the tail gas purification flue, a water washing tank can be connected, so that the position control rod and the ventilation sleeves can enter the inside of the water washing tank to treat the particles in the particle collecting and screening cavity.

[0013] As a further scheme of the present application, a rotary kiln tail gas treatment system includes the following use method:

[0014] A: the transformation roasting is carried out in the firing zone, the combustion tail gas is attracted to the preheating zone for heat conduction, the particles in the tail gas are concentrated in the particle collecting and screening cavity under the blocking effect of the ventilation sleeve, if the temperature in the firing zone decreases, the tail gas subjected to acidizing roasting in the independent acidizing roasting chamber flows into the second built-in rod and flows to the firing zone for temperature conversion, and the particles in the tail gas can be concentrated in the particle collecting and screening cavity;

[0015] B: the cooling gas generated in the cooling zone enters the second built-in rod and flows to the temperature conversion in the sintering zone, and circulating water can take away the heat carried by the transformed clinker in the sintering zone, and the tail gas enters the tail gas purification chamber for precooling.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] The transformed roasting is carried out in the sintering zone, the combustion tail gas is sucked into the preheating zone for heat conduction, the particles in the tail gas are concentrated in the particle collection and screening cavity through the blocking effect of the air sleeve, if the temperature in the sintering zone is reduced, the tail gas of the acidizing roasting in the independent acidizing roasting chamber enters the second built-in rod and flows to the temperature conversion in the sintering zone, and the particles in the tail gas can be concentrated in the particle collection and screening cavity, the cooling gas generated in the cooling zone enters the second built-in rod and flows to the temperature conversion in the sintering zone, and circulating water can take away the heat carried by the transformed clinker in the sintering zone, and the tail gas enters the tail gas purification chamber for precooling, the transformed roasting and acidizing roasting of the material are carried out in one kiln body, the production environment is utilized, and the temperature in the preheating zone and the sintering zone can be assisted to control in the process of flowing of the tail gas to the tail gas purification chamber, and the particles in the tail gas are removed. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Fig. 1 It is a structure schematic diagram of a rotary kiln tail gas treatment system;

[0020] Fig. 2 It is a structure schematic diagram of a rotary kiln shell in a rotary kiln tail gas treatment system;

[0021] Fig. 3 It is a structure schematic diagram of a gas intercommunication assembly in a rotary kiln tail gas treatment system;

[0022] Fig. 4 It is a structure schematic diagram of an air sleeve in a rotary kiln tail gas treatment system;

[0023] In the figure: 1, rotary kiln shell; 11, preheating zone; 12, sintering zone; 121, independent acidizing roasting chamber; 13, cooling zone; 14, kiln head; 15, tail gas purification smoke chamber; 2, gas intercommunication assembly; 21, pressure conveying inner plate; 22, first built-in rod; 23, second built-in rod; 24, air passage sleeve; 25, particle collection and screening cavity; 26, position control rod. DETAILED DESCRIPTION

[0024] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clear and explicit, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0025] Please refer to Figs. 1-4 In the embodiment of the present application, a rotary kiln tail gas treatment system comprises a rotary kiln shell 1, the rotary kiln shell 1 has a preheating zone 11 for preheating, a sintering zone 12 for transformation roasting and a cooling zone 13 for cooling forming inside, the sintering zone 12 has an independent acidizing roasting chamber 121 for sulfuric acid roasting inside, the rotary kiln shell 1 is provided with a gas intercommunication assembly 2 for attracting tail gas inside, the gas intercommunication assembly 2 comprises a pressure conveying inner plate 21, a plurality of first built-in rods 22, a plurality of second built-in rods 23 and a plurality of air passage sleeves 24, the tail gas located in the sintering zone 12 enters the first built-in rods 22 to screen out particulate matter and flows to the preheating zone 11, the tail gas located in the independent acidizing roasting chamber 121 enters the second built-in rods 23 to screen out particulate matter and flows to the sintering zone 12, and the cooling gas located in the cooling zone 13 enters the second built-in rods 23 and flows to the sintering zone 12.

[0026] In the embodiment, lithium carbonate is produced in the rotary kiln, and lithium spodumene material needs to be transformed and roasted and acidized and roasted, the rotary kiln shell 1 has a preheating zone 11 for preheating, a sintering zone 12 for transformation roasting and a cooling zone 13 for cooling forming inside, firstly, the material can be preheated in the preheating zone 11, the preheating zone 11 can be completed by a rotary preheater, and then enters the sintering zone 12 for transformation roasting, and then enters the independent acidizing roasting chamber 121 for acidizing roasting, wherein the tail gas generated by roasting can flow into the first built-in rods 22 and the second built-in rods 23, the outer wall of the first built-in rods 22 and the second built-in rods 23 has suction holes as the entry channel of the tail gas, under the action of the air passage sleeve 24 arranged, the gas can flow from the holes of the air passage sleeve 24, and the particulate matter in the tail gas can be concentrated in the particle collection and screening cavity 25, the tail gas located in the particle collection and screening cavity 25 can be pretreated, so as to facilitate subsequent treatment of the tail gas, and finally the tail gas is pre-cooled and enters the tail gas purification smoke chamber 15 for treatment.

[0027] The temperature in the sintering zone 12 changes, the combustion tail gas is sucked into the preheating zone 11 to conduct heat, natural gas is injected, combustion is carried out in the kiln, and the tail gas generated in the sintering zone 12 can be sucked into the first built-in rod 22, driven by the fan to suck, and the first built-in rod 22 can be located in the preheating zone 11. The section of the first built-in rod 22 located in the preheating zone 11 can be provided with a heat conducting layer, so that the heat of the first built-in rod 22 with a certain temperature can be conducted to the preheating zone 11 to provide auxiliary heat for the preheating zone 11. If the temperature in the sintering zone 12 decreases, the tail gas in the independent acidizing roasting chamber 121 enters the second built-in rod 23 and flows into the sintering zone 12 to change the temperature. Because the temperature in the independent acidizing roasting chamber 121 is lower than the overall temperature in the sintering zone 12, the tail gas can be transferred to the second built-in rod 23, and a shunt rod is arranged on the second built-in rod 23 and the first built-in rod 22, which can introduce the tail gas into the first built-in rod 22 through the second built-in rod 23. The acidized tail gas can circulate with the sintering zone 12 as a transfer point, can conduct the temperature in the sintering zone 12, increase the temperature of the discharged acidized tail gas, and to a certain extent, reduce the temperature in the sintering zone 12, and assist in cooling. The heat of the first built-in rod 22 with a certain temperature can be conducted to the preheating zone 11 to provide auxiliary heat for the preheating zone 11. The first built-in rod 22 can be provided with a shunt rod that enters the tail gas purification chamber 15, so that the tail gas enters the tail gas purification chamber 15 for treatment after being used.

[0028] The cooling gas generated in the cooling zone 13 enters the second built-in rod 23 and flows into the sintering zone 12 to change the temperature, and the circulating water can take away the heat carried by the transformed clinker in the sintering zone 12. The circulating water is circulated in a separate circulating pipeline, and the position of the pipeline can correspond to the shunt rod on the first built-in rod 22 that enters the tail gas purification chamber 15. The tail gas enters the tail gas purification chamber 15 for precooling, so that the gas flowing in the second built-in rod 23 can be separately circulated, facilitating the circulation of the tail gas or the cooling gas. The cooling gas on the second built-in rod 23 can be provided with a shunt rod, so that the position can correspond to the shunt rod on the first built-in rod 22 that enters the tail gas purification chamber 15. The tail gas enters the tail gas purification chamber 15 for precooling.

[0029] The processing of the ventilation sleeve 24, the position control rod 26 is connected to a plurality of ventilation sleeves 24, the position control rod 26 can be connected by the electric drive structure, so that the position control rod 26 moves horizontally, the position control rod 26 pulls the plurality of ventilation sleeves 24 to move in the first inner rod 22 or the second inner rod 23, and the water washing tank can be connected at the discharge end, so that the position control rod 26 and the ventilation sleeve 24 can enter the inside of the water washing tank to process the particles in the particle separation chamber 25, and the flowing gas or liquid can be discharged into the first inner rod 22 and the second inner rod 23 to press the position of the inner plate 21, so that the first inner rod 22 and the second inner rod 23 are flushed with liquid or gas, so as to improve the use effect of the first inner rod 22 and the second inner rod 23.

[0030] As shown in Figs. 1-4 The application also provides a method for using the rotary kiln tail gas treatment system, and the specific steps are as follows:

[0031] A: transformation roasting is carried out in the sintering zone 12, the combustion tail gas is sucked into the preheating zone 11 to conduct heat conduction, the particles in the tail gas are concentrated in the particle separation chamber 25 by the blocking effect of the ventilation sleeve 24, if the sintering zone 12 is cooled, the tail gas of the acidizing roasting in the independent acidizing roasting chamber 121 enters the second inner rod 23 and flows to the sintering zone 12 to convert the temperature, and at the same time, the particles in the tail gas can be concentrated in the particle separation chamber 25;

[0032] B: the cooling gas generated in the cooling zone 13 enters the second inner rod 23 and flows to the sintering zone 12 to convert the temperature, and at the same time, the circulating water can take away the heat carried by the transformed clinker in the sintering zone 12, and when the tail gas enters the tail gas purification flue 15 to be precooled.

[0033] The working principle of the present application is that: in the production of lithium carbonate in the rotary kiln, the spodumene material needs to be transformed and roasted and acidized. First, the material can be preheated in the preheating zone 11 and then roasted in the firing zone 12 that meets the material transformation and roasting requirements. Then, the material is cooled and enters the independent acidizing roasting chamber 121 for acidizing roasting. The tail gas generated by the roasting can flow into the first inner rod 22 and the second inner rod 23. Under the action of the gas sleeve 24, the gas can flow from the holes of the gas sleeve 24, and the particulate matter in the tail gas can be concentrated in the particle collection and screening cavity 25. The position control rod 26 is connected to multiple gas sleeves 24, allowing the position control rod 26 to move horizontally. The position control rod 26 pulls the multiple gas sleeves 24 to move in the first inner rod 22 or the second inner rod 23. At the discharge end, a water washing pool can be connected to allow the position control rod 26 and the gas sleeve 24 to enter the water washing pool for processing the particulate matter in the particle collection and screening cavity 25. At the same time, gas or liquid can be discharged into the first inner rod 22 and the second inner rod 23 for pressure delivery of the inner plate 21 position. The liquid or gas is filled to flush the inside of the first inner rod 22 and the second inner rod 23, thereby improving the use effect of the first inner rod 22 and the second inner rod 23. Finally, the tail gas is pre-cooled and enters the tail gas purification smoke chamber 15 for treatment. The combustion tail gas is attracted to the preheating zone 11 for heat conduction, and natural gas is injected for combustion in the kiln. The tail gas generated in the firing zone 12 can be attracted to the inside of the first inner rod 22, which is driven by the fan. This part of the first inner rod 22 can be located in the preheating zone 11. The section of the first inner rod 22 located in the preheating zone 11 can be provided with a heat conduction layer, allowing the heat of the first inner rod 22 with a certain temperature to be conducted to the preheating zone 11 to provide auxiliary heat for the preheating zone 11. If the temperature in the firing zone 12 decreases, the tail gas in the independent acidizing roasting chamber 121 enters the second inner rod 23 and flows to the firing zone 12 for temperature conversion. Since the temperature in the independent acidizing roasting chamber 121 is lower than the overall temperature in the firing zone 12, the tail gas can be transferred to the second inner rod 23. A flow dividing rod is arranged on the second inner rod 23 and the first inner rod 22, allowing the tail gas to pass through the second inner rod 23 and then be introduced into the first inner rod 22. The acidized tail gas can flow through the firing zone 12 as a transfer point, allowing the temperature in the firing zone 12 to be conducted to increase the temperature of the discharged acidized tail gas and reduce the temperature in the firing zone 12 to a certain extent for auxiliary cooling. The heat of the first inner rod 22 with a certain temperature can be conducted to the preheating zone 11 to provide auxiliary heat for the preheating zone 11. A flow dividing rod can be arranged on the first inner rod 22 to enter the tail gas purification smoke chamber 15, allowing the tail gas to be treated in the tail gas purification smoke chamber 15 after use. The cooling gas generated in the cooling zone 13 enters the second inner rod 23 and flows to the firing zone 12 for temperature conversion.Meanwhile, the circulating water can take away the heat carried by the transformed clinker in the sintering zone 12. The circulating water is circulated in a separate circulating pipeline. The pipeline is arranged at a position corresponding to the shunt rod arranged on the first built-in rod 22 and capable of entering the tail gas purification chamber 15. The tail gas enters the tail gas purification chamber 15 for precooling, so that the gas circulating in the second built-in rod 23 can be separately circulated, facilitating the circulation of the tail gas or the cooling gas. The cooling gas on the second built-in rod 23 can be provided with a shunt rod, so that the position can correspond to the shunt rod arranged on the first built-in rod 22 and capable of entering the tail gas purification chamber 15. The tail gas enters the tail gas purification chamber 15 for precooling.

[0034] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art, according to the technical solution and the inventive concept of the present application, can make equivalent replacements or changes within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A rotary kiln off-gas treatment system comprising a rotary kiln shell (1), characterized in that, The rotary kiln shell (1) has a preheating zone (11) for preheating, a sintering zone (12) for transformation roasting and a cooling zone (13) for cooling forming inside, the sintering zone (12) has an independent acidizing roasting chamber (121) for sulfuric acid roasting, the rotary kiln shell (1) is internally provided with a gas intercommunication assembly (2) for attracting tail gas, the gas intercommunication assembly (2) comprises a pressure conveying inner plate (21), a plurality of first built-in rods (22), a plurality of second built-in rods (23) and a plurality of air passing sleeves (24), tail gas in the sintering zone (12) enters the first built-in rod (22) to sieve out particulate matter and flow to the preheating zone (11), tail gas in the independent acidizing roasting chamber (121) enters the second built-in rod (23) to sieve out particulate matter and flow to the sintering zone (12), cooling gas in the cooling zone (13) enters the second built-in rod (23) and flows to the sintering zone (12), the first built-in rod (22) and the second built-in rod (23) have suction holes on the outer wall for attracting tail gas; The heat carried by roasting tail gas and transformed clinker in the sintering zone (12) is attracted by circulating water, and one end of the rotary kiln shell (1) is sealingly connected with a tail gas purification smoke chamber (15), tail gas generated by the preheating zone (11), the sintering zone (12) and the independent acidizing roasting chamber (121) is discharged into the tail gas purification smoke chamber (15) through the first built-in rod (22) and the second built-in rod (23); A plurality of the air passing sleeves (24) are slidably arranged in the first built-in rod (22) and the second built-in rod (23), and the air passing sleeves (24) arranged in the first built-in rod (22) and the second built-in rod (23) are in a symmetrical state; The pressure conveying inner plate (21) has openings through which materials pass, and the pressure conveying inner plate (21) has an attraction cavity and a pressure cavity inside for being controlled by a fan, the first built-in rod (22) and the second built-in rod (23) are fixedly connected with the pressure conveying inner plate (21), and the pressure conveying inner plate (21) is rotationally connected in the rotary kiln shell (1); The air passing sleeve (24) is conical, and the air passing sleeve (24) has a particle collecting and screening cavity (25) formed on the outer wall and the inner wall of the first built-in rod (22) and the second built-in rod (23) for collecting tail gas particles; A plurality of the air passing sleeves (24) arranged in the first built-in rod (22) are connected by a position control rod (26), one end of the rotary kiln shell (1) has a kiln head (14), and one end of the position control rod (26) penetrates through the rotary kiln shell (1) and extends to the outside of the rotary kiln shell (1); A plurality of the air passing sleeves (24) arranged in the second built-in rod (23) are connected by a position control rod (26), and one end of the position control rod (26) penetrates through the tail gas purification smoke chamber (15) and extends to the outside of the tail gas purification smoke chamber (15).

2. A rotary kiln off-gas treatment system according to claim 1, characterized in that, The independent acidizing roasting chamber (121) has passages for entering and discharging materials on both sides, and is wrapped with a heat insulation layer outside.

3. A method of using a rotary kiln off-gas treatment system according to any one of claims 1-2, characterized in that: The use method includes the following cases: A: Transformation roasting is carried out in the sintering zone (12), the combustion tail gas is sucked into the preheating zone (11) for heat conduction, the blocking effect of the ventilation sleeve (24) concentrates the particulate matters in the tail gas in the particle collection and screening cavity (25), if the temperature in the sintering zone (12) decreases, the tail gas of the acidizing roasting in the independent acidizing roasting chamber (121) enters the second built-in rod (23) and flows to the sintering zone (12) for temperature conversion, and the particulate matters in the tail gas can be concentrated in the particle collection and screening cavity (25); B: The cooling gas generated in the cooling zone (13) enters the second built-in rod (23) and flows to the sintering zone (12) for temperature conversion, the circulating water can take away the heat carried by the transformation clinker in the sintering zone (12), and the tail gas enters the tail gas purification flue (15) for precooling.

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