Device and method for efficiently purifying flue gas of rotary furnace

Abstract

The invention relates to the technical field of rotary furnace flue gas purification treatment, and particularly discloses an efficient rotary furnace flue gas purification device and method.The efficient rotary furnace flue gas purification device comprises a device body, a purification unit is arranged in the device body, and the purification unit sequentially comprises a sedimentation area and a tumble area from bottom to top; a gas flow compression and adsorption device is arranged in the settling area and is used for compressing input initial flue gas and inputting the flue gas into the tumble area at the same time; the airflow compression and adsorption device is further provided with an air return pipe, smoke in the tumble area is pumped back through the air return pipe and mixed with the initial smoke, and in the smoke pumping-back process, the smoke in the tumble area is drained downwards to enhance the settling effect of the smoke; and a smoke outlet is formed in the upper part of the tumble area. According to the invention, the purification effect on the flue gas of the rotary furnace can be obviously improved, blockage is avoided, and the service life is obviously prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of rotary kiln fume purification, and in particular to a rotary kiln fume high-efficiency purification device and method. Background Art

[0002] As the core high-temperature calcining equipment in the cement, metallurgy, chemical and other industries, the rotary kiln generates a large amount of high-temperature exhaust gas containing solid particles during its operation. In order to reduce the company's energy consumption, the heat of the high-temperature exhaust gas is recycled and utilized through a heat exchange device in production. However, if the dust particles in the exhaust gas are not reduced before entering the heat exchange device, the dust particles will adhere to the core heat exchange components of the heat exchange device, resulting in a decrease in heat exchange efficiency and the need to disassemble and clean the equipment. Therefore, dust removal is required before the exhaust gas enters the heat exchange device. Based on the high-temperature characteristics of the exhaust gas from the rotary kiln, before heat exchange, the traditional main technical solution is filtering, such as bag dust removal. However, the use of filtering technical solutions will lead to easy clogging and the common problem of bag burning because the exhaust gas is in a high-temperature state before heat exchange. Summary of the Invention

[0003] The present invention provides a rotary kiln flue gas high-efficiency purification device and method to solve the above-mentioned background technical problems.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A high-efficiency purification device for rotary kiln flue gas comprises a device body, wherein a purification unit is arranged in the device body, and the purification unit comprises a sedimentation zone and a tumble flow zone in order from bottom to top; an air flow compression adsorption device is arranged in the sedimentation zone, and the air flow compression adsorption device is used to compress the input initial flue gas and simultaneously input the flue gas into the tumble flow zone; the air flow compression adsorption device is also provided with an air return pipe, through which the flue gas in the tumble flow zone is drawn back and mixed with the initial flue gas, and during the smoke gas drawing back process, the smoke in the tumble flow zone is drained downward to enhance the sedimentation effect of the smoke; a smoke exhaust port is provided at the upper part of the tumble flow zone.

[0006] Optionally, the air flow compression adsorption device includes an air intake section, a compression section, a negative pressure section and a release section from bottom to top, and the tube diameter of the negative pressure section is smaller than the tube diameter of the air intake section; the compression section is conical and connected between the air intake section and the negative pressure section; the release section is a bell-mouth structure and is combined with the upper part of the negative pressure section; the side wall of the negative pressure section is connected to a return air pipe, and the other end of the return air pipe is arranged below the tumble zone.

[0007] Optionally, a conical cover is provided in the sedimentation zone, which separates the sedimentation zone into a first sedimentation zone and a second sedimentation zone, and the first sedimentation zone is directly connected to the tumble zone; a plurality of damping holes are provided on the conical cover, and the second sedimentation zone is connected to the first sedimentation zone through the damping holes; the other end of the return air pipe is provided in the second sedimentation zone.

[0008] Optionally, the damping through hole is arranged in the lower middle part of the conical cover.

[0009] Optionally, a first sediment discharge port is provided at the lower end of the conical cover, and a sewage discharge gap is reserved between the lower end of the first sediment discharge port and the bottom surface of the second sedimentation area.

[0010] Optionally, the device body further includes a smoke inlet cavity, which is communicated with the smoke inlet of the airflow compression adsorption device; the smoke inlet cavity is provided with a main smoke inlet.

[0011] Optionally, a plurality of the purification units are provided in the device body, and the plurality of the purification units share one tumble flow zone.

[0012] Optionally, a damping plate is provided on the upper portion of the tumble flow zone, an air outlet cavity is formed above the damping plate, and a smoke outlet is provided on the air outlet cavity.

[0013] A method for efficiently purifying flue gas from a rotary kiln is provided, wherein the method uses the above-mentioned efficient purifying device for flue gas from a rotary kiln to purify the flue gas from the rotary kiln, and the steps are as follows:

[0014] (1) The flue gas from the rotary kiln is compressed in the air flow compression adsorption device to increase the collision probability of solid dust particles in the flue gas, thereby agglomerating them into large agglomerated particles and spraying the flue gas into the tumble flow area;

[0015] (2) By narrowing and contracting the pipeline, negative pressure is generated in the negative pressure section, and the smoke flows back through the return pipe, thereby forming a negative pressure area below the tumble flow area, guiding the smoke in the tumble flow area to sink, and improving the smoke settling effect;

[0016] (3) The dust particles in the flue gas are settled in the settling zone, thereby purifying the flue gas from the rotary kiln. Optionally, before step (1), the flue gas from the rotary kiln is pressurized.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention realizes the precipitation of dust particles in the flue gas of the rotary kiln by improving the sedimentation effect. Compared with the technical solution of the traditional filter screen, the filter screen will not be clogged, and the related components do not have easily burned components such as cloth bags, which significantly improves the service life. It can be used as a flue gas pretreatment equipment before the flue gas of the rotary kiln enters the heat exchange device, and has good flue gas dust removal effect and good purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments.

[0020] Figure 1 It is a structural schematic diagram of the air flow compression adsorption device of the present invention;

[0021] Figure 2 yes Figure 1 Schematic diagram of air flow;

[0022] Figure 3 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "inside", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0025] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, or electrical connections; direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0026] A rotary kiln flue gas high efficiency purification device, such as Figures 1 to 3As shown, it includes a device body 1, in which a purification unit is provided, and the purification unit includes a settling area 18 and a tumble area 21 from bottom to top; an airflow compression adsorption device is provided in the settling area 18, and the airflow compression adsorption device is used to compress the input initial flue gas and input the flue gas into the tumble area at the same time; the airflow compression adsorption device is also provided with an air return pipe, through which the flue gas in the tumble area is drawn back and mixed with the initial flue gas, and in the process of drawing back the flue gas, the flue gas in the tumble area is guided downward to enhance the settling effect of the flue gas; a smoke exhaust port is provided on the upper part of the tumble area. In this embodiment, the airflow compression adsorption device adopts the following technical solutions: Figure 1 As shown, the airflow compression adsorption device includes, from bottom to top, an air intake section 12, a compression section 11, a negative pressure section 10, and a release section 7; the upper portion of the release section 7 is a smoke injection port 5. In this embodiment, a connecting flange 6 is provided on the top of the smoke injection port 5 for fixing the top of the airflow compression adsorption device via a connecting rod (not shown) or the like. The diameter of the negative pressure section 10 is smaller than that of the air intake section 12. The compression section is conical and connected between the air intake section and the negative pressure section. The release section is a bell-mouth structure and is combined with the upper portion of the negative pressure section 10 to inject smoke into the tumble flow area 21. The purpose of this design is The high-temperature flue gas output by the rotary kiln is input from the air intake section 12 and then compressed by the compression section 11, which causes the dust particles in the flue gas to be accelerated in this section and increases the collision of small particles to gather into large particles. After the high-speed flue gas enters the negative pressure section 10 with a smaller pipe diameter, according to Bernoulli's principle, the increase in flow rate is accompanied by a decrease in fluid pressure, that is, a negative pressure zone will be formed in the negative pressure section 10. The formed negative pressure zone is connected to the side wall of the negative pressure section with a return air pipe 17. The other end of the return air pipe 17 is arranged below the tumble flow area 21, which serves as a drainage power to drain the flue gas on the tumble flow area 21 downward, thereby helping the sedimentation of solid particles in the flue gas.

[0027] Optionally, a conical cover 8 is provided in the settling area 18, and the conical cover 8 separates the settling area 18 into a first settling area and a second settling area; Figure 3 As shown, the first settling area is directly connected to the tumble area 21; during preparation, the conical cover 8 can be narrow at the top and wide at the bottom or wide at the top and narrow at the bottom. In this embodiment, it is preferably as follows Figure 1 The illustrated wide-at-top, narrow-at-bottom structure facilitates the gradual contraction of the flue gas's downward sedimentation space, further enhancing the aggregation of solid particles within the flue gas into larger particles and their subsequent fallout. The conical cover 8 is provided with a plurality of damping holes 9, through which the second sedimentation zone communicates with the first sedimentation zone. The other end opening 3 of the return air duct 2 is positioned within the second sedimentation zone. Optionally, the damping holes 9 are positioned in the lower middle portion of the conical cover 8.

[0028] In this embodiment, the function of the conical cover 8 is to construct a second sedimentation zone for constructing a negative pressure zone, and then realize 360-degree uniform negative pressure drainage through the damping through hole 9, so that the flue gas on the tumble flow zone 21 receives the power of downward drainage, especially the larger solid particles with heavier mass, which can be more easily gathered and settled downward under this structure. Therefore, the damping through hole 9 mainly plays the role of uniform negative pressure and constructing negative pressure in the lower part of the first sedimentation zone, rather than acting as a screen for dust filtering. Therefore, in this embodiment, the aperture of the damping through hole 9 can preferably be above 3-5 mm to reduce the problem of clogging.

[0029] Optionally, a first sediment discharge port 14 is provided at the lower end of the conical cover 8. A drainage gap is reserved between the lower end of the first sediment discharge port 14 and the bottom surface of the second sedimentation zone. In this embodiment, the outer wall of the air inlet section 12 and the first sediment discharge port 14 are connected by a connecting rod 16. The upper portion of the conical cover 8 is connected to the device body. During use, solid soot settles and accumulates at the bottom, filling the drainage gap. For regular soot discharge, the soot can be cleaned by opening the cover plate through the soot outlet 13 provided on the side wall.

[0030] Optional, such as Figure 3 As shown, the device body also includes a flue gas inlet chamber 19, which communicates with the flue gas inlet of the airflow compression adsorption device. A main flue gas inlet 20 is provided in this chamber. During operation, a high-temperature fan can be installed between the main flue gas inlet 20 and the rotary kiln flue gas for pressurization. The high-temperature fan is preferably a variable frequency high-temperature fan. The lower air inlets 15 of the purification unit air inlet sections 12 communicate with the flue gas inlet chamber 19.

[0031] In this embodiment, if Figure 3 As shown, the device body is equipped with several purification units, which share a tumble flow zone 21. If the device body is circular, the purification units can be arranged in an alternating annular pattern, i.e., the projection surface forms a multi-layered annular arrangement. Through the arrangement of multiple purification units, the flue gas is evenly diverted and settled, and each purification unit forms an independent settling space, reducing the mutual influence of the settling process. In effect, the more soot settled in the purification unit, the better the purification effect on the initial flue gas.

[0032] Optionally, a damping plate 22 is provided above the tumble flow zone 21. An air outlet cavity 23 is formed above the damping plate 22, and a smoke outlet 24 is provided in the air outlet cavity 23. In this embodiment, the damping plate 22 functions to slow down the smoke ejected from the smoke injection port 5 and improve the effective settling of the smoke within the tumble flow zone 21. The damping plate 22 is provided with a plurality of beveled openings 22. Since the function is not filtering, the width of the beveled openings can be approximately 3-5 mm to prevent clogging. During use, smoke flows upward from the tumble flow zone 21, enters the air outlet cavity 23, and flows out of the smoke outlet 24 to enter the next smoke treatment process (such as a heat recovery device).

[0033] A method for efficiently purifying flue gas from a rotary kiln is provided, wherein the method uses the above-mentioned efficient purifying device for flue gas from a rotary kiln to purify the flue gas from the rotary kiln, and the steps are as follows:

[0034] (1) The flue gas from the rotary kiln is compressed in the air flow compression adsorption device to increase the collision probability of solid dust particles in the flue gas, thereby agglomerating them into large agglomerated particles and spraying the flue gas into the tumble flow area;

[0035] (2) By narrowing and contracting the pipeline, negative pressure is generated in the negative pressure section, and the smoke flows back through the return pipe, thereby forming a negative pressure area below the tumble flow area, guiding the smoke in the tumble flow area to sink, and improving the smoke settling effect;

[0036] (3) The dust particles in the flue gas are settled in the settling zone, thereby purifying the flue gas from the rotary kiln. Optionally, before step (1), the flue gas from the rotary kiln is pressurized.

[0037] That is, the present invention realizes the precipitation of dust particles in the flue gas of the rotary kiln by improving the sedimentation effect. Compared with the technical solution of the traditional filter screen, the filter screen will not be blocked, and the related components do not have easily burned components such as cloth bags, which significantly improves the service life. It can be used as a flue gas pretreatment equipment before the flue gas of the rotary kiln enters the heat exchange device, and has good flue gas dust removal effect and good purification effect.

Claims

1. A high-efficiency purification device for rotary kiln flue gas, characterized by: The device comprises a main body, wherein a purification unit is arranged in the main body of the device, and the purification unit comprises a sedimentation zone and a tumble flow zone in order from bottom to top; an air flow compression adsorption device is arranged in the sedimentation zone, and the air flow compression adsorption device is used to compress the input initial flue gas and input the flue gas into the tumble flow zone at the same time; the air flow compression adsorption device is also provided with an air return pipe, through which the flue gas in the tumble flow zone is drawn back and mixed with the initial flue gas, and during the process of drawing back the flue gas, the flue gas in the tumble flow zone is drained downward to enhance the sedimentation effect of the flue gas; a smoke exhaust port is arranged at the upper part of the tumble flow zone.

2. The high-efficiency rotary kiln flue gas purification device according to claim 1, characterized in that: The airflow compression adsorption device includes an air intake section, a compression section, a negative pressure section and a release section from bottom to top, and the tube diameter of the negative pressure section is smaller than the tube diameter of the air intake section; the compression section is conical and connected between the air intake section and the negative pressure section; the release section is a bell-mouth structure and is combined with the upper part of the negative pressure section; the side wall of the negative pressure section is connected to a return air pipe, and the other end of the return air pipe is arranged below the tumble zone.

3. The high-efficiency rotary kiln flue gas purification device according to claim 2, characterized in that: A conical cover is provided in the sedimentation area, which divides the sedimentation area into a first sedimentation area and a second sedimentation area. The first sedimentation area is directly connected to the tumble area; a plurality of damping holes are provided on the conical cover, and the second sedimentation area is connected to the first sedimentation area through the damping holes; the other end of the return air pipe is provided in the second sedimentation area.

4. The high-efficiency rotary kiln flue gas purification device according to claim 3, characterized in that: The damping through hole is arranged in the middle and lower part of the conical cover.

5. The high-efficiency rotary kiln flue gas purification device according to claim 3, characterized in that: A first sediment discharge port is provided at the lower end of the conical cover, and a sewage discharge gap is reserved between the lower end of the first sediment discharge port and the bottom surface of the second sedimentation area.

6. The high-efficiency rotary kiln flue gas purification device according to claim 1, characterized in that: The device body further comprises a smoke inlet cavity, which is communicated with the smoke inlet of the airflow compression adsorption device; the smoke inlet cavity is provided with a main smoke inlet.

7. The high-efficiency rotary kiln fume purification device according to claim 1, characterized in that: A plurality of purification units are arranged in the device body, and the plurality of purification units share one tumble flow zone.

8. The high-efficiency rotary kiln fume purification device according to claim 1, characterized in that: A damping plate is provided on the upper portion of the tumble flow zone, an air outlet cavity is formed above the damping plate, and a smoke outlet is provided on the air outlet cavity.

9. A method for efficiently purifying flue gas from a rotary kiln, characterized in that: The rotary kiln fume high-efficiency purification device according to any one of claims 1 to 8 is used to purify the rotary kiln fume, the steps of which are: (1) The flue gas from the rotary kiln is compressed in the air flow compression adsorption device to increase the collision probability of solid dust particles in the flue gas, thereby agglomerating them into large agglomerated particles and spraying the flue gas into the tumble flow area; (2) By narrowing and contracting the pipeline, negative pressure is generated in the negative pressure section, and the smoke flows back through the return pipe, thereby forming a negative pressure area below the tumble flow area, guiding the smoke in the tumble flow area to sink, and improving the smoke settling effect; (3) The dust particles in the flue gas are settled in the settling zone, thereby purifying the flue gas from the rotary kiln.

10. The method for efficiently purifying rotary kiln flue gas according to claim 9, characterized in that: Before step (1), the flue gas from the rotary kiln is pressurized.

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