Cement kiln tail flue gas treatment device

Abstract

The utility model discloses a cement kiln tail flue gas treatment device which comprises a cyclone dust removal cylinder, a desulfurization box and an adsorption box, a smoke inlet channel is fixedly communicated with the front end of the cyclone dust removal cylinder, a positioning plate is fixedly mounted on the inner wall of the upper end of the desulfurization box, a circulating hole is formed in the end face of the positioning plate in a penetrating manner, a liquid collecting tank is fixedly mounted on the outer side wall of the upper end of the desulfurization box in a supporting manner, a pump body is fixedly communicated with the side end of the liquid collecting tank, and a liquid distribution pipe is fixedly communicated with the upper end of the liquid collecting tank; a spraying head is fixedly communicated with the inner side of the upper end of the liquid separation pipe, a limiting sliding groove is fixedly formed in the inner wall of the adsorption box, an adsorption filter element used for adsorbing and purifying smoke is movably connected to the inner wall of the limiting sliding groove in an attached mode, a sealing cover is hinged to the front end of the adsorption box, and an exhaust fan is fixedly communicated with the lower end of the adsorption box through a connecting pipeline. And the upper end of the exhaust fan fixedly communicates with a smoke exhaust pipe. According to the device, dust removal, desulfurization and adsorption purification treatment can be conveniently carried out on the kiln tail flue gas of the cement kiln.

Description

Technical Field

[0001] This utility model relates to the field of cement production technology, specifically to a cement kiln tail gas treatment device. Background Technology

[0002] A cement kiln is a device used to sinter cement raw materials (raw meal) into cement clinker. It is a core component of the cement production line, directly impacting the quality and efficiency of cement production. The main functions of a cement kiln include:

[0003] Chemical Reactor: The high-temperature environment inside the cement kiln (typically requiring 1450℃) allows the raw materials to react fully, undergoing a series of physical and chemical changes to become clinker. This is a crucial step in the cement production process. Combustion and Heat Transfer Equipment: The high temperature inside the kiln is generated by fuel combustion. The heat generated is transferred to the materials through radiation, convection, and conduction, ensuring that the materials are fully heated and undergo chemical reactions. Conveying Equipment: Materials are added from the kiln tail. Because the kiln shell is installed at an angle, as the kiln rotates, the materials continuously move from the kiln tail to the kiln head, achieving continuous material conveying and reaction.

[0004] Cement, as a crucial raw material for infrastructure construction, plays an indispensable role in global economic development. In recent years, with the acceleration of global urbanization and the continuous advancement of infrastructure construction, the demand for cement has shown a steady upward trend. However, cement production is a high-energy-consuming and highly polluting process, especially the flue gas emitted from cement kilns, which has become one of the main sources of air pollution.

[0005] However, in practical applications, existing technologies are ineffective against the complex flue gas emitted from cement kilns during cement production. This flue gas contains large amounts of fly ash, dust, and corrosive components such as acid and alkali oxides. Not only is the temperature high and the dust concentration high, but the dust is also fine and sticky, causing serious environmental pollution. While traditional flue gas treatment devices can remove some dust and particulate matter, their purification efficiency and processing capacity are limited, making it difficult to meet increasingly stringent environmental protection requirements. Utility Model Content

[0006] The purpose of this invention is to provide a cement kiln tail gas treatment device to address the problem mentioned in the background art: the flue gas emitted from the cement kiln tail during cement production is complex, containing large amounts of fly ash, dust, and corrosive components such as acid and alkali oxides. This flue gas is not only high in temperature and dust concentration, but the dust is also fine and sticky, causing serious environmental pollution. While traditional flue gas treatment devices can remove some dust and particulate matter, their purification efficiency and processing capacity are limited, making it difficult to meet increasingly stringent environmental protection requirements.

[0007] To achieve the above objectives, this utility model provides the following technical solution: including a cyclone dust collector, a desulfurization box, and an adsorption box;

[0008] The front end of the cyclone dust collector is fixedly connected to a flue gas inlet channel. A positioning plate is fixedly installed on the upper inner wall of the desulfurization box. A flow hole is opened through the end face of the positioning plate. A liquid collection tank is fixedly installed on the upper outer wall of the desulfurization box. A pump body is fixedly connected to the side end of the liquid collection tank. A liquid distribution pipe is fixedly connected to the upper end of the liquid collection tank. A spray head is fixedly connected to the inner side of the upper end of the liquid distribution pipe. A limiting groove is fixedly installed on the inner wall of the adsorption box. An adsorption filter element for adsorbing and purifying flue gas is movably connected to the inner wall of the limiting groove. A sealing cover is hinged to the front end of the adsorption box. An exhaust fan is fixedly connected to the lower end of the adsorption box through a connecting pipe. An exhaust pipe is fixedly connected to the upper end of the exhaust fan. A preheating recovery pipe is fixedly installed on the outer curved surface of the exhaust pipe.

[0009] Preferably, the lower end of the flue gas inlet channel is connected to the kiln tail of the cement kiln, and the lower end of the cyclone dust collector is conical.

[0010] Preferably, the bottom of the cyclone dust collector is provided with a discharge port, and the upper end of the cyclone dust collector is connected to the lower outer side of the desulfurization box through a connecting pipe.

[0011] Preferably, there are several flow holes, which are symmetrically distributed sequentially on the end face of the positioning plate, and the inlet of the pump body is connected to an external desulfurizing agent pipeline.

[0012] Preferably, there are several liquid distribution pipes, which are symmetrically distributed sequentially at the upper end of the liquid collection tank, and the inner side of the upper end of the liquid distribution pipe extends to the inner side of the upper end of the desulfurization box.

[0013] Preferably, the spray head is located directly above the flow hole, the lower end of the desulfurization box is conical, the lower end of the desulfurization box is fixedly connected to a drain valve, and the upper outer side of the desulfurization box is connected to the adsorption box through a connecting pipe.

[0014] Preferably, there are several limiting slides, with each pair of limiting slides forming a group, and the several groups of limiting slides are symmetrically distributed from top to bottom along the inner wall of the adsorption box, with the preheating recovery pipe supplemented with flowing hot water.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention allows flue gas to pass through a cyclone dust collector. Particulate dust inside the flue gas is discharged downwards through the discharge port under gravity, while the flue gas continues to flow upwards under centrifugal force, separating the particulate dust inside and ensuring extremely low dust content in the flue gas entering subsequent processing stages. This achieves dust removal. As the flue gas continues to flow upwards, it flows through a connecting pipe to the lower end of the desulfurization tank. When the flue gas reaches the lower end of the desulfurization tank, the pump is activated. When the pump is activated, it draws the desulfurizing agent from the external desulfurization pipeline. The desulfurizing agent is pressurized and discharged into the collection tank. When the desulfurizing agent is pressurized and discharged into the collection tank, it is guided to the spray head through the distribution pipe. When the desulfurizing agent is guided to the spray head, it is sprayed downward through the flow hole. When the desulfurizing agent is sprayed downward, the flue gas at the bottom of the desulfurization box will flow upward through the flow hole, so that the flue gas and the desulfurizing agent can be fully contacted. When the flue gas and the desulfurizing agent are fully contacted, the sulfur dioxide inside the flue gas will be absorbed and converted into sulfite, thereby achieving desulfurization treatment while removing dust from the flue gas.

[0017] This invention also allows for the following process: after the flue gas undergoes desulfurization treatment, it is guided to the adsorption box via a connecting pipe. Inside the adsorption box, the adsorption filter element adsorbs and purifies the harmful substances within the flue gas. Simultaneously, by opening the sealing cover, the adsorption filter element, which is movably connected to the inner wall of the limiting slide groove, can be maintained or replaced. After the flue gas undergoes adsorption purification, the purified flue gas is discharged into the exhaust pipe via an exhaust fan. Furthermore, the preheating recovery pipe, in conjunction with hot water absorption, recovers and utilizes the waste heat from the purified flue gas for preheating cement production raw materials or generating steam, improving energy efficiency. This facilitates dust removal, desulfurization, and adsorption purification of the flue gas from the cement kiln tail. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a cement kiln tail gas treatment device according to the present invention. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the overall structure of a cement kiln tail gas treatment device according to the present invention. Figure 2 ;

[0020] Figure 3 This is a partial structural cross-sectional view of a cement kiln tail gas treatment device according to the present invention. Figure 1 ;

[0021] Figure 4 This is a partial structural cross-sectional view of a cement kiln tail gas treatment device according to the present invention. Figure 2.

[0022] In the diagram: 1. Cyclone dust collector; 2. Desulfurization box; 3. Adsorption box; 4. Flue gas inlet channel; 5. Discharge port; 6. Positioning plate; 7. Flow hole; 8. Liquid collection tank; 9. Pump body; 10. Liquid distribution pipe; 11. Spray head; 12. Drain valve; 13. Limiting slide; 14. Adsorption filter element; 15. Sealing cover; 16. Exhaust fan; 17. Flue gas pipe; 18. Preheating recovery pipe. Detailed Implementation

[0023] 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.

[0024] Please see Figure 1-4 This utility model provides a technical solution for a cement kiln tail gas treatment device, which includes a cyclone dust collector 1, a desulfurization box 2, and an adsorption box 3.

[0025] The front end of the cyclone dust collector 1 is fixedly connected to the flue gas inlet channel 4, and the lower end of the flue gas inlet channel 4 is connected to the tail of the cement kiln, so that the flue gas from the tail of the cement kiln is discharged into the flue gas inlet channel 4. The lower end of the cyclone dust collector 1 is conical in shape, and a discharge port 5 is opened at the bottom of the cyclone dust collector 1. The upper end of the cyclone dust collector 1 is connected to the lower outer side of the desulfurization box 2 through a connecting pipe. A positioning plate 6 is fixedly installed on the upper inner wall of the desulfurization box 2. A flow hole 7 is opened through the end face of the positioning plate 6, and there are several flow holes 7, which are symmetrically distributed on the end face of the positioning plate 6. A liquid collection tank 8 is fixedly installed on the upper outer wall of the desulfurization box 2. A pump body 9 is fixedly connected to the side end of the liquid collection tank 8, and the inlet of the pump body 9 is connected to an external desulfurizing agent pipeline. A liquid distribution pipe 10 is fixedly connected to the upper end of the liquid collection tank 8, and there are several liquid distribution pipes 10, which are symmetrically distributed on the upper end of the liquid collection tank 8. The inner side of the upper end of the liquid distribution pipe 10 extends to the desulfurization box 2. Inside the upper end, a spray head 11 is fixedly connected to the inner side of the upper end of the liquid distribution pipe 10, and the spray head 11 is located directly above the flow hole 7. The lower end of the desulfurization box 2 is conical, and a drain valve 12 is fixedly connected to the lower end of the desulfurization box 2. The outer side of the upper end of the desulfurization box 2 is connected to the adsorption box 3 through a connecting pipe. A limiting groove 13 is fixedly installed on the inner wall of the adsorption box 3, and there are several limiting grooves 13. Every two limiting grooves 13 form a group, and several groups of limiting grooves 13 are symmetrically distributed from top to bottom on the inner wall of the adsorption box 3. An adsorption filter element 14 for adsorbing and purifying flue gas is movably connected to the inner wall of the limiting groove 13. A sealing cover 15 is hinged to the front end of the adsorption box 3. An exhaust fan 16 is fixedly connected to the lower end of the adsorption box 3 through a connecting pipe. An exhaust pipe 17 is fixedly connected to the upper end of the exhaust fan 16. A preheating recovery pipe 18 is fixedly installed on the outer curved surface of the exhaust pipe 17, and hot water is replenished inside the preheating recovery pipe 18.

[0026] Working principle: In use, this utility model connects the lower end of the flue gas inlet channel 4 to the tail of the cement kiln. When the lower end of the flue gas inlet channel 4 is connected to the tail of the cement kiln, the flue gas from the tail of the cement kiln will be discharged into the flue gas inlet channel 4. When the flue gas from the tail of the cement kiln is discharged into the flue gas inlet channel 4, the exhaust fan 16 is turned on by control. When the exhaust fan 16 is turned on, the flue gas will be discharged outward in sequence through the cyclone dust collector 1, the desulfurization box 2 and the adsorption box 3, in conjunction with the connecting pipe.

[0027] When the flue gas passes through the cyclone dust collector 1, the particulate dust inside the flue gas will be discharged downwards through the discharge port 5 under the action of gravity, while the flue gas will continue to flow upwards under the action of centrifugal force, so that the particulate dust inside the flue gas is separated, ensuring that the dust content of the flue gas entering the subsequent treatment stage is extremely low, thereby achieving dust removal treatment of the flue gas. As the flue gas continues to flow upwards, it will flow to the lower end of the desulfurization box 2 through the connecting pipe. When the flue gas flows to the lower end of the desulfurization box 2, the pump body 9 is activated by control. When the pump body 9 is activated, it will pressurize the desulfurizing agent inside the external desulfurizing agent pipeline. The desulfurizing agent is discharged into the collection tank 8. When the desulfurizing agent is pressurized and discharged into the collection tank 8, it will be guided to the spray head 11 through the liquid distribution pipe 10. When the desulfurizing agent is guided to the spray head 11, it will be sprayed downward along the flow hole 7 through the spray head 11. When the desulfurizing agent is sprayed downward, the flue gas at the lower end of the desulfurization box 2 will flow upward through the flow hole 7, so that the flue gas and the desulfurizing agent can be fully contacted. When the flue gas and the desulfurizing agent are fully contacted, the sulfur dioxide inside the flue gas will be absorbed and converted into sulfite, thereby achieving desulfurization treatment while removing dust from the flue gas.

[0028] After the flue gas undergoes desulfurization treatment, it is guided into the adsorption box 3 through a connecting pipe. When the flue gas enters the adsorption box 3, the adsorption filter element 14 adsorbs and purifies the harmful substances inside the flue gas. At the same time, by opening the sealing cover 15, the adsorption filter element 14, which is movably connected to the inner wall of the limiting slide groove 13, can be maintained and replaced. After the flue gas has undergone adsorption purification treatment, the exhaust fan 16 discharges the purified flue gas into the exhaust pipe 17. When the purified flue gas is discharged into the exhaust pipe 17, the treated flue gas can be discharged outward through the exhaust pipe 17. At the same time, the waste heat of the purified flue gas is recovered and utilized through the preheating recovery pipe 18 in conjunction with hot water absorption to preheat cement production raw materials or generate steam, thereby improving energy utilization efficiency. This facilitates the dust removal, desulfurization, and adsorption purification treatment of the flue gas at the tail of the cement kiln.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cement kiln off-gas treatment device, characterized by: It comprise cyclone dust removal cylinder (1), desulfurization tank (2) and adsorption tank (3); The front end of the cyclone dust removal cylinder (1) is fixedly connected with a smoke inlet channel (4), the upper end of the desulfurization tank (2) is fixedly installed with a positioning plate (6), the end face of the positioning plate (6) is penetrated with a flow-through hole (7), the outer side wall of the upper end of the desulfurization tank (2) is fixedly installed with a liquid collecting tank (8), the side end of the liquid collecting tank (8) is fixedly connected with a pump body (9), the upper end of the liquid collecting tank (8) is fixedly connected with a distribution pipe (10), the inner side of the upper end of the distribution pipe (10) is fixedly connected with a spray head (11), the inner wall of the adsorption tank (3) is fixedly installed with a limiting sliding groove (13), the inner wall of the limiting sliding groove (13) is movably connected with an adsorption filter core (14) for adsorbing and purifying flue gas, the front end of the adsorption tank (3) is hingedly sealed with a cover (15), the lower end of the adsorption tank (3) is fixedly connected with an exhaust fan (16) through a connecting pipeline, the upper end of the exhaust fan (16) is fixedly connected with a smoke exhaust pipe (17), and the outer curved surface of the smoke exhaust pipe (17) is fixedly installed with a preheating recovery pipe (18).

2. A cement kiln exhaust gas treatment device according to claim 1, characterized in that: The lower end of the smoke inlet channel (4) is communicated with the kiln tail of the cement kiln, and the lower end of the cyclone dust removal cylinder (1) is conical.

3. A cement kiln exhaust gas treatment device according to claim 2, characterized in that: The bottom of the cyclone dust removal cylinder (1) is provided with a discharge port (5), and the upper end of the cyclone dust removal cylinder (1) is communicated with the outer side of the lower end of the desulfurization tank (2) through a connecting pipeline.

4. A cement kiln exhaust gas treatment device according to claim 3, characterized in that: The number of flow-through holes (7) is several, which are symmetrically distributed in sequence on the end face of the positioning plate (6), and the outer end inlet of the pump body (9) is communicated with the external desulfurizer pipeline.

5. A cement kiln exhaust gas treatment device according to claim 4, characterized in that: The number of distribution pipes (10) is several, which are symmetrically distributed in sequence on the upper end of the liquid collecting tank (8), and the inner side of the upper end of the distribution pipe (10) extends to the inside of the upper end of the desulfurization tank (2).

6. A cement kiln exhaust gas treatment device according to claim 5, characterized in that: The spray head (11) is located directly above the flow-through hole (7), the lower end of the desulfurization tank (2) is conical, the lower end of the desulfurization tank (2) is fixedly connected with a blowdown valve (12), and the upper end of the desulfurization tank (2) is communicated with the adsorption tank (3) through a connecting pipeline.

7. A cement kiln exhaust gas treatment device according to claim 6, characterized in that: The number of limiting sliding grooves (13) is several, every two limiting sliding grooves (13) form a group, and several groups of limiting sliding grooves (13) are symmetrically distributed in sequence from top to bottom on the inner wall of the adsorption tank (3), and the preheating recovery pipe (18) internally supplements flowing heat-absorbing water.

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