Kiln tail waste gas denitration device of cement kiln

Abstract

The utility model provides a cement kiln tail waste gas denitration device, including: front seal housing, inner filter core, stabilizing subassembly and rear adapter, the rear side of front seal housing is equipped with a group of inner filter core that is used for catching and retaining the particulate matter in cement kiln tail waste gas, inner filter core includes shell and filter core, the filter core is equipped with the stabilizing subassembly, the rear adapter is equipped with the stabilizing subassembly, the stabilizing subassembly is equipped with the stabilizing subassembly, and the stabilizing subassembly is equipped with the stabilizing subassembly. Compared with the prior art, the cement kiln tail waste gas multi-stage filter has the following beneficial effects that particulate matters in cement kiln tail waste gas are subjected to multi-stage filtration through the front sealing cover shells with different sizes and the inner filter liner cores with different sizes; as the sizes of the front sealing housing and the inner filter liner core are continuously reduced along the flowing direction of the airflow, and the airflow pressure of the cement kiln tail waste gas is continuously increased, the circulation efficiency of the cement kiln tail waste gas in the three groups of side gas guide pipes I and side gas guide pipes II is improved, and the cement kiln tail waste gas is conveniently mixed with a reducing agent spray.

Description

Technical Field

[0001] This utility model belongs to the field of kiln tail gas denitrification technology, and relates to a kiln tail gas denitrification device for cement kilns. Background Technology

[0002] Existing kiln tail gas denitrification technologies have some drawbacks in terms of particulate matter filtration and high-pressure gas resonance. Regarding particulate matter filtration, while conventional bag filters or electrostatic precipitators can effectively remove particles, they are prone to failure in high-temperature, high-humidity, or corrosive kiln tail gas. Furthermore, filtration efficiency decreases with particle accumulation, leading to emissions exceeding standards. These drawbacks are primarily due to the complex composition and harsh operating conditions of kiln tail gas, which place higher demands on the durability of filter materials and the stability of the filtration system. Conventional solutions include using high-temperature and corrosion-resistant filter materials. However, these methods are costly, and frequent maintenance and replacement increase production downtime, impacting production efficiency. Additionally, existing bag filters or electrostatic precipitators experience significant vibration during operation, affecting the catalytic reaction between the kiln tail gas and the reducing agent, further impacting the denitrification effect. Therefore, a kiln tail gas denitrification device for cement kilns is urgently needed to address these issues. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a denitrification device for the kiln tail gas of a cement kiln, so as to solve the problems mentioned in the background technology.

[0004] This utility model is achieved through the following technical solution: a denitrification device for kiln tail exhaust gas of cement kiln, comprising: a front sealing cover and a rear pipe, wherein the rear side of the front sealing cover is provided with a set of inner filter cores for capturing and retaining particulate matter in the kiln tail exhaust gas of cement kiln, the inner filter cores comprising an outer shell and a filter element, the outer shell being made of a heat-insulating metal material, and the inner side of the outer shell being provided with a set of inner heat-insulating layers for preventing the high temperature of exhaust gas inside the inner gas pipe from escaping;

[0005] The inner insulation layer is equipped with two sets of internal air pipes for conducting the exhaust gas from the cement kiln tail. The two sets of internal air pipes are arranged in a horizontal structure, and each set of internal air pipes is connected to an air inlet groove. The front side of each set of internal air pipes is equipped with several sets of air inlet holes with a rectangular cross-section. The rear side of the air inlet holes inside each set of internal air pipes is equipped with a filter element for capturing and retaining particulate matter in the exhaust gas from the cement kiln tail inside the internal air pipe.

[0006] In a preferred embodiment, the front sealing cover is provided with two sets of threaded joints for sealing connection with the external cement kiln tail exhaust gas connection pipe. Each set of threaded joints is provided with an air inlet groove for introducing the cement kiln tail exhaust gas. Both sets of threaded joints are respectively sealed to a set of front sealing covers by bolts and sealing ring gaskets.

[0007] In a preferred embodiment, the front sealing cover is provided in three sets, and the internal dimensions of each set of front sealing covers are proportionally reduced from front to back. The inner rear end of each set of front sealing covers is movably sealed and fitted with the outer side of a set of inner filter cores, and the outer side is fixed by bolts through metal buckles.

[0008] As a preferred embodiment, the left side of the last set of inner filter cores is provided with a set of side air guide pipes for guiding the filtered cement kiln tail exhaust gas, and the right side of the last set of inner filter cores is provided with a set of side air guide pipes for guiding the filtered cement kiln tail exhaust gas.

[0009] The first and second side air guide pipes are of the same specifications, and are connected to a set of three-way connectors on the rear side for introducing a reducing agent that needs to convert nitrogen oxides in the cement kiln tail exhaust gas into nitrogen and water vapor. When the operator introduces the external cement kiln tail exhaust gas through the two sets of air inlet slots, the particulate matter inside the cement kiln tail exhaust gas is filtered in multiple stages by front sealing shells of different sizes and inner filter cores of different sizes. As the size of the front sealing shell and the inner filter core continuously decreases with the direction of airflow, the airflow pressure of the cement kiln tail exhaust gas continuously increases, so as to improve the flow efficiency of the cement kiln tail exhaust gas inside the three sets of side air guide pipes and the second side air guide pipe, and facilitate the mixing of the cement kiln tail exhaust gas with the reducing agent spray.

[0010] In a preferred embodiment, the upper end of the connecting tee is provided with a set of reducing agent connectors for maintaining the reducing agent connecting pipe connection, and the lower end of the reducing agent connector and one end inside the connecting tee is provided with a set of atomizing nozzles for atomizing and spraying the reducing agent. The reducing agent used is ammonia water or finished urea solution. The rear side of the connecting tee is provided with a set of connecting pipes for discharging the cement kiln tail gas after catalytic reduction denitrification.

[0011] As a preferred embodiment, each set of connecting pipes is provided with a set of stabilizing components for maintaining the stable discharge of high-temperature and high-pressure cement kiln tail gas.

[0012] The stabilizing component includes a connecting seat and a pressure plate. The stabilizing component is provided in several groups, and the several groups of stabilizing components are combined and fixed. A connecting shell column with an annular structure is provided between every two groups of stabilizing components. A sealing liner for sealing and limiting fitting with the connecting shell column is provided on the front side of the connecting seat.

[0013] In a preferred embodiment, the inner side of the connecting seat is provided with a set of limiting grooves for restricting the contraction and movement of the pressure plate. A set of spring damping columns for mitigating the pressure of the cement kiln tail gas discharge is located in the middle of the limiting grooves. The rear side of the spring damping columns is fixedly connected to the middle of the front side of the connecting seat. When the cement kiln tail gas is fully mixed with the reducing agent, the high-temperature, high-pressure cement kiln tail gas enters the stabilizing component after passing through the connecting tee and the inside of the connecting pipe. The high-temperature, high-pressure cement kiln tail gas flows through the inner cavity outside the pressure plate. The pressure plate bears the pressure of the high-temperature, high-pressure cement kiln tail gas, and the spring damping columns mitigate the pressure on the pressure plate, while reducing the airflow resonance phenomenon generated after the cement kiln tail gas is discharged at the rear pipe position, thus ensuring the sealing effect during the cement kiln tail gas denitrification process.

[0014] In a preferred embodiment, the front side of the spring damping column is provided with a set of pressure plates for supporting the pressure of the front stabilizing components. When several sets of stabilizing components are installed together, an inner cavity for guiding the exhaust gas from the cement kiln tail is provided between the outer side of the pressure plate and the inner side of the corresponding connecting shell column.

[0015] After adopting the above technical solution, the beneficial effects of this utility model are: multi-stage filtration of particulate matter inside the cement kiln tail exhaust gas is carried out by using front sealing shells of different sizes and inner filter cores of different sizes. As the size of the front sealing shell and the inner filter core continuously decreases with the direction of airflow, the airflow pressure of the cement kiln tail exhaust gas continuously increases, so as to improve the flow efficiency of the cement kiln tail exhaust gas inside the three sets of side air guide pipes one and two, and to facilitate the mixing of the cement kiln tail exhaust gas with the reducing agent spray.

[0016] After the cement kiln tail gas is fully mixed with the reducing agent, the high-temperature and high-pressure cement kiln tail gas enters the stabilizing component after passing through the connecting tee and the inside of the connecting pipe. The high-temperature and high-pressure cement kiln tail gas flows through the inner cavity outside the pressure plate. The pressure plate bears the pressure of the high-temperature and high-pressure cement kiln tail gas, and the pressure borne by the pressure plate is released by the spring damping column. At the same time, it reduces the airflow resonance phenomenon generated after the cement kiln tail gas is discharged at the rear pipe position, so as to ensure the sealing effect of the cement kiln tail gas denitrification process. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a top view of the left front oblique side of the structure of a denitrification device for kiln tail gas of a cement kiln according to the present invention.

[0019] Figure 2 This is a top view of the front side of the inner filter element in a denitrification device for kiln tail gas of a cement kiln according to the present invention.

[0020] Figure 3 This is a top view of the rear side of the inner filter element in a denitrification device for kiln tail gas of a cement kiln according to the present invention.

[0021] Figure 4 This is a top view of the front structure of the stabilization component in a cement kiln tail gas denitrification device according to the present invention.

[0022] In the diagram: 100-Front sealing cover, 110-Threaded connector, 120-Inlet slot, 130-Inner filter element, 140-Side air guide pipe one, 150-Side air guide pipe two, 160-Connecting tee, 170-Reducing agent connector, 180-Connecting pipe, 190-Stabilizing component, 200-Rear connecting pipe;

[0023] 13a - Outer shell, 13b - Inner insulation layer, 13c - Inner air pipe, 13d - Air inlet vent, 13e - Filter element;

[0024] 19a-Connecting seat, 19b-Sealing liner, 19c-Spring damping column, 19d-Limiting groove, 19e-Pressure plate. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figures 1-4A denitrification device for kiln tail gas of cement kiln includes: a front sealing cover 100, an inner filter core 130, a stabilizing component 190 and a rear pipe 200. The rear side of the front sealing cover 100 is provided with an inner filter core 130 for capturing and retaining particulate matter in the kiln tail gas of cement kiln. The inner filter core 130 includes an outer shell 13a and a filter element 13e. The outer shell 13a is made of a heat-insulating metal material. The inner side of the outer shell 13a is provided with an inner heat-insulating layer 13b for preventing the high temperature of the exhaust gas inside the inner gas pipe 13c from escaping.

[0027] The inner insulation layer 13b has two sets of internal air pipes 13c for conducting the exhaust gas from the cement kiln tail. The two sets of internal air pipes 13c are arranged in a horizontal structure, and each set of internal air pipes 13c corresponds to a set of air inlet slots 120 and is interconnected. Each set of internal air pipes 13c has several sets of air inlet holes 13d with a rectangular cross-section on the front side. Each set of internal air pipes 13c has a set of filter elements 13e on the rear side of the air inlet holes 13d for capturing and retaining particulate matter in the exhaust gas from the cement kiln tail inside the internal air pipes 13c.

[0028] The front sealing cover 100 is provided with two sets of threaded joints 110 for sealing connection with the external cement kiln tail exhaust gas connection pipe 180. Each set of threaded joints 110 is provided with an air inlet groove 120 for introducing the cement kiln tail exhaust gas. Both sets of threaded joints 110 are respectively sealed to a set of front sealing covers 100 by bolts and sealing ring gaskets.

[0029] The front sealing cover 100 is provided in three sets, and the internal dimensions of each set of front sealing cover 100 are proportionally reduced from front to back. The inner rear end of each set of front sealing cover 100 is movably sealed and fitted with the outer side of an inner filter element 130, and the outer side is fixed by bolts through metal buckles.

[0030] On the left side of the last set of inner filter cores 130, there is a set of side air guide pipe 140 for guiding the filtered cement kiln tail exhaust gas, and on the right side of the last set of inner filter cores 130, there is a set of side air guide pipe 2 150 for guiding the filtered cement kiln tail exhaust gas.

[0031] Side air guide pipe 140 and side air guide pipe 2 150 have the same specifications, and are connected to a set of connecting tee 160 on the rear side for introducing a reducing agent that needs to convert nitrogen oxides in cement kiln tail exhaust gas into nitrogen and water vapor into the side air guide pipe 140 and side air guide pipe 2 150.

[0032] The upper end of the connecting tee 160 is provided with a set of reducing agent connectors 170 for maintaining the reducing agent connecting pipe 180 inlet connection. The lower end of the reducing agent connector 170 and the end located inside the connecting tee 160 is provided with a set of atomizing nozzles for atomizing and spraying the reducing agent. The reducing agent used is ammonia water or finished urea solution. The rear side of the connecting tee 160 is provided with a set of connecting pipes 180 for discharging the cement kiln tail gas after catalytic reduction denitrification.

[0033] Each set of connecting pipes 180 is equipped with a set of stabilizing components 190 on the rear side to ensure the stable discharge of high-temperature and high-pressure cement kiln tail exhaust gas.

[0034] The stabilizing component 190 includes a connecting seat 19a and a pressure plate 19e. The stabilizing component 190 is provided in several groups, and the several groups of stabilizing components 190 are combined and connected and fixed. A connecting shell column with an annular structure is provided between every two groups of stabilizing components 190. A sealing liner 19b is provided on the front side of the connecting seat 19a for sealing and limiting fitting with the connecting shell column.

[0035] The inner side of the connecting seat 19a is provided with a set of limiting grooves 19d for restricting the shrinkage and movement of the pressure plate 19e. The middle position of the limiting groove 19d is provided with a set of spring damping columns 19c for slowing down the discharge pressure of the cement kiln tail exhaust gas. The rear side of the spring damping column 19c is connected and fixed to the middle position of the front side of the connecting seat 19a.

[0036] A set of pressure plates 19e is provided on the front side of the spring damping column 19c to support the pressure of the front stabilizing component 190. When several sets of stabilizing components 190 are installed together, an inner cavity is provided between the outer side of the pressure plate 19e and the inner side of the corresponding connecting shell column to guide the exhaust gas of the cement kiln tail.

[0037] Please see Figures 1-4 As the first embodiment of this utility model: when the worker introduces the external cement kiln tail exhaust gas duct through the two sets of air inlet slots 120, the internal particulate matter of the cement kiln tail exhaust gas is filtered in multiple stages through front sealing shells 100 of different sizes and inner filter cores 130 of different sizes. As the size of the front sealing shell 100 and the inner filter core 130 continuously decreases with the direction of airflow, the airflow pressure of the cement kiln tail exhaust gas continuously increases, so as to improve the flow efficiency of the cement kiln tail exhaust gas inside the three sets of side air guide pipes 140 and 150, and to facilitate the mixing of the cement kiln tail exhaust gas with the reducing agent spray.

[0038] Please see Figures 1-4As a second embodiment of this utility model: Based on the description in the above embodiments, further, after the cement kiln tail gas and the reducing agent are fully mixed, the high-temperature and high-pressure cement kiln tail gas enters the stabilizing component 190 after passing through the connecting tee 160 and the connecting pipe 180. The high-temperature and high-pressure cement kiln tail gas flows through the inner cavity outside the pressure plate 19e. The pressure plate 19e bears the pressure of the high-temperature and high-pressure cement kiln tail gas, and the pressure borne by the spring damping column 19c is released slowly. At the same time, the airflow resonance phenomenon generated after the cement kiln tail gas is discharged at the rear pipe 200 position is reduced, so as to ensure the sealing effect during the denitrification process of cement kiln tail gas.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A denitration device for a kiln exhaust gas of a cement kiln, comprising: The front sealing cover (100), the inner filter core (130), the stabilizing assembly (190) and the rear connecting pipe (200) are characterized in that: a group of inner filter cores (130) for capturing and retaining particles in the cement kiln tail gas are arranged on the rear side of the front sealing cover (100), the inner filter core (130) comprises an outer shell (13a) and a filter core (13e), the outer shell (13a) is made of a temperature insulation metal material, and an inner temperature insulation layer (13b) for preventing the internal exhaust gas of the inner air pipe (13c) from being high-temperature emitted is arranged on the inner side of the outer shell (13a); The inner temperature insulation layer (13b) is internally provided with two groups of inner air pipes (13c) for conducting the cement kiln tail gas, the two groups of inner air pipes (13c) are arranged in a horizontal structure, and each group of inner air pipes (13c) corresponds to a group of inner air pipes (13c) which are internally and mutually connected with each other, and the front side of each group of inner air pipes (13c) is provided with a plurality of groups of rectangular structure air inlet sub-holes (13d), and the rear side of the air inlet sub-hole (13d) in each group of inner air pipes (13c) is provided with a group of filter cores (13e) for capturing and retaining particles in the cement kiln tail gas.

2. The device for denitration of exhaust gas from the kiln tail of a cement kiln according to claim 1, characterized in that: The front side of the front sealing cover (100) is provided with two groups of threaded joints (110) for sealing connection with the external cement kiln tail gas connecting pipe (180), the inner side of each group of threaded joints (110) is provided with a group of air inlet grooves (120) for guiding the cement kiln tail gas, and the two groups of threaded joints (110) are respectively sealingly connected with a group of front sealing covers (100) through bolts and sealing ring gaskets.

3. The denitration device for the exhaust gas of the kiln tail of a cement kiln according to claim 2, characterized in that: The front sealing cover (100) is provided with three groups, and the size of each group of front sealing covers (100) gradually decreases from front to back, and the inner side of the rear end of each group of front sealing covers (100) is movably sealingly embedded with a group of outer sides of inner filter cores (130), and the outer side is fixed by bolt connection through metal buckles.

4. The denitration device for the exhaust gas of the kiln tail of a cement kiln according to claim 3, characterized in that: The left side of the last group of inner filter cores (130) is provided with a group of side air guide pipes one (140) for guiding the filtered cement kiln tail gas, and the right side of the last group of inner filter cores (130) is provided with a group of side air guide pipes two (150) for guiding the filtered cement kiln tail gas. The side air guide pipe one (140) and the side air guide pipe two (150) are of the same specification, and the rear side is provided with a group of connecting tees (160) for guiding the reducing agent into the side air guide pipe one (140) and the side air guide pipe two (150) to convert nitrogen oxides in the external cement kiln tail gas into nitrogen and water vapor.

5. The denitration device for the exhaust gas of the kiln tail of a cement kiln according to claim 4, characterized in that: The upper end of the connecting tee (160) is provided with a group of reducing agent joints (170) for retaining the introduction of reducing agent connecting pipe (180), the lower end of the reducing agent joint (170) and the inside end of the connecting tee (160) is provided with a group of atomizing nozzles for atomizing and spraying reducing agent, the reducing agent is ammonia water or finished urea solution, the rear side of the connecting tee (160) is provided with a group of connecting pipes (180) for guiding the cement kiln tail gas after catalytic reduction denitrification.

6. The denitration device for the exhaust gas of the kiln tail of a cement kiln according to claim 5, characterized in that: The rear side of each group of connecting pipes (180) is provided with a group of stabilizing components (190) for retaining the stable discharge of high temperature and high pressure cement kiln tail gas; The stabilizing component (190) includes a connecting seat (19a) and a pressure bearing plate (19e), the stabilizing component (190) is provided with several groups, and the several groups of stabilizing components (190) are combined and connected and fixed, and a group of connecting shell columns with annular structure are arranged between every two groups of stabilizing components (190), the front side of the connecting seat (19a) is provided with a group of sealing inner liners (19b) for sealing and limiting fitting with the connecting shell column.

7. The denitration device for the exhaust gas of the kiln tail of a cement kiln according to claim 6, characterized in that: The inner side of the connecting seat (19a) is provided with a group of limiting grooves (19d) for limiting the contraction movement of the pressure bearing plate (19e), the middle position of the limiting groove (19d) is provided with a group of spring damping columns (19c) for buffering the exhaust pressure of the cement kiln tail gas, the rear side of the spring damping column (19c) is connected and fixed with the middle position of the front side of the connecting seat (19a).

8. The kiln tail gas denitration device of a cement kiln according to claim 7, characterized in that: The front side of the spring damping column (19c) is provided with a group of pressure bearing plates (19e) for supporting the pressure of the front side stabilizing component (190), when the several groups of stabilizing components (190) are combined and installed, a group of inner cavities for guiding the cement kiln tail gas are arranged between the outer side of the pressure bearing plate (19e) and the inner side of the corresponding connecting shell column.

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