Waste heat recovery dust removal mechanism and rotary kiln

Abstract

The waste heat recovery and dust removal mechanism comprises a barrel, a dust removal unit and a heat exchange unit, the barrel is provided with an inner cavity, an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are both communicated with the inner cavity, the dust removal unit is provided with a sleeve and a dust collection piece, and the sleeve is installed in the inner cavity and provided with a dust collection cavity and an exhaust cavity. The dust collecting piece is installed in the dust collecting cavity and used for absorbing dust in airflow and guiding the airflow to the exhaust cavity, and the exhaust cavity communicates with an exhaust pipe extending out of the inner cavity; the heat exchange unit is installed in the inner cavity, communicates with the dust collection cavity and is provided with an air conveying end, and airflow input through the air conveying end sequentially flows through the heat exchange unit, the dust collection cavity and the exhaust cavity and is output through the exhaust pipe. The problems that high-temperature waste gas generated during ceramsite drying and roasting of a rotary kiln needs to be firstly introduced into heat exchange equipment for heat recovery and then introduced into dust removal equipment for dust removal, and the heat exchange equipment and the dust removal equipment are independent units, are large in size and occupy large space are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to waste gas treatment technical field, concretely relates to a waste heat recovery dust removal mechanism and rotary kiln. BACKGROUND

[0002] The rotary kiln is mainly used for drying and calcining in the production of ceramic particles. After the ceramic particle raw materials (such as sludge, clay, etc.) are crushed, mixed and granulated, raw balls of a certain size are formed, which are sent into the kiln tail of the rotary kiln by the feeding device. After the raw balls enter the kiln, they first pass through the preheating zone and contact with the high-temperature flue gas from the kiln head, and the moisture begins to evaporate. With the rotation of the kiln body, the material gradually moves to the high-temperature zone. In the drying zone, the moisture in the material is further evaporated, and the material is fully dried. The dried material continues to advance and enters the calcining zone, where the temperature gradually rises, and the material begins to undergo physical and chemical changes. In the high-temperature section of the calcining zone, the material reaches the calcining temperature (usually 950℃ to 1150℃), and internal expansion reaction occurs, forming porous ceramic particles.

[0003] As disclosed in the existing patent application No. CN201820355599.4, a rotary kiln tail gas dust removal device is disclosed, which specifically includes a heat recovery bin, a water washing shell, a bag dust collector, a protective cover, a dispersing head and a drying device. The heat recovery bin is installed with a tail gas inlet at one end, and a heat exchange pipe is installed inside the heat recovery bin. The heat recovery bin is installed with a heat exchange outlet at one end. The heat exchange outlet is connected with the water washing shell through a water washing pipe. The water washing shell is provided with water washing liquid. The water washing shell is installed with a water washing outlet at the upper end. The water washing outlet is connected with a dust removal pipe at the upper side. The dust removal pipe is installed with a bag dust collector at one end. The bag dust collector is installed with an exhaust port at one end.

[0004] Through the above-mentioned scheme, the high-temperature waste gas generated by the drying and calcining of ceramic particles by the rotary kiln needs to be first introduced into the heat exchange equipment for heat recovery, and then introduced into the dust removal equipment for dust removal. The heat exchange equipment and the dust removal equipment are independent units, which are relatively large in size and occupy a large space, and are not suitable for industrial sites with limited space. UTILITY MODEL CONTENTS

[0005] The utility model aims to overcome the above technical deficiencies, and provides a waste heat recovery dust removal mechanism to solve the problem that the high-temperature waste gas generated by the drying and calcining of ceramic particles by the rotary kiln needs to be first introduced into the heat exchange equipment for heat recovery, and then introduced into the dust removal equipment for dust removal. The heat exchange equipment and the dust removal equipment are independent units, which are relatively large in size and occupy a large space.

[0006] To achieve the above technical purpose, the utility model adopts the following technical scheme:

[0007] The utility model provides a waste heat recovery dust removal mechanism, which comprises:

[0008] a cylinder body having an inner cavity, an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe both communicating with the inner cavity;

[0009] a dust removal unit having a sleeve and a dust collection member, the sleeve being installed in the inner cavity and having a dust collection cavity and an exhaust cavity, the dust collection member being installed in the dust collection cavity and being used for absorbing dust in the air flow and guiding the air flow to the exhaust cavity, the exhaust cavity being communicated with an exhaust pipe extending to the outside of the inner cavity; and

[0010] a heat exchange unit being installed in the inner cavity, the heat exchange unit being communicated with the dust collection cavity and having a gas inlet end, the air flow input through the gas inlet end sequentially flowing through the heat exchange unit, the dust collection cavity and the exhaust cavity, and being output through the exhaust pipe.

[0011] In some embodiments, a partition is fixedly arranged in the sleeve, the partition divides the sleeve into the dust collection cavity and the exhaust cavity, and the exhaust cavity is located above the dust collection cavity; the dust collection member includes a plurality of cloth bag cylinders, and open ends of the plurality of cloth bag cylinders are fixedly connected with the partition.

[0012] In some embodiments, the heat exchange unit includes a gas guide cover, a gas distribution cover and a plurality of heat exchange pipes, the gas guide cover and the gas distribution cover are respectively installed at opposite ends of the sleeve, the gas guide cover and a side wall of a top end of the sleeve enclose a first cavity, the gas distribution cover and a side wall of a bottom end of the sleeve enclose a second cavity, the plurality of heat exchange pipes are distributed along a circumference of the sleeve and are communicated with the first cavity and the second cavity, the gas guide cover is connected with a gas inlet end extending to the outside of the cylinder body, and the side wall of the sleeve is provided with at least one air hole for communication between the second cavity and the dust collection cavity.

[0013] In some embodiments, each heat exchange pipe is spaced apart from each other along an axial direction and is provided with a plurality of heat exchange fins.

[0014] In some embodiments, the dust removal unit further includes a gas jetting member, the gas jetting member is installed in the cylinder body, and the gas jetting member is used for outputting high-speed air flow to the open end of each cloth bag cylinder to shake off dust adsorbed on each cloth bag cylinder.

[0015] In some embodiments, the gas jetting member includes a high-pressure gas storage pipe, a gas guide pipe and a plurality of high-pressure nozzles, the high-pressure gas storage pipe is installed in the cylinder body, an air outlet end of the high-pressure gas storage pipe is connected with the gas guide pipe, the gas guide pipe is arranged in the exhaust cavity and is connected with the plurality of high-pressure nozzles, and each high-pressure nozzle corresponds to the open end of each cloth bag cylinder.

[0016] In some embodiments, a bottom of the sleeve extends to the outside of the cylinder body, the bottom of the sleeve is provided with a dust discharging pipe, and a dust discharging valve is installed on the dust discharging pipe.

[0017] In some embodiments, at least one gas distribution plate is fixedly arranged in the inner cavity and between the air inlet pipe and the air outlet pipe.

[0018] In some embodiments, the heat exchange pipe is a carbon steel pipe, a low alloy steel pipe, a stainless steel pipe or a copper alloy steel pipe.

[0019] The utility model also provides a rotary kiln, the gas delivery end of heat exchange unit is linked with the exhaust pipe of rotary kiln, the gas outlet pipe of cylinder is linked with the hot air import of rotary kiln.

[0020] Compared with the prior art, the waste heat recovery dust removal mechanism provided by the utility model is installed in the inner cavity through the sleeve, has the dust collection cavity and the exhaust cavity, the dust collection element is installed in the dust collection cavity, the heat exchange unit is installed in the inner cavity, which is communicated with the dust collection cavity and has the gas delivery end, the hot gas stream output by the rotary kiln can be input through the gas delivery end and flow through the heat exchange unit, the dust collection cavity and the exhaust cavity in sequence and be output through the exhaust pipe, by integrating the dust removal unit and the heat exchange unit in the cylinder, the heat exchange unit can realize heat exchange between the hot gas stream and the normal temperature gas stream conveyed into the inner cavity through the air inlet pipe, recover part of the heat in the hot gas stream and improve the utilization rate of heat resources, the dust collection element can absorb the dust in the gas stream, the integrated design reduces the land occupation of separate equipment and is favorable for improving the space utilization rate of the production workshop. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structure schematic view of a waste heat recovery dust removal mechanism provided by the utility model embodiment;

[0022] Figure 2 is Figure 1 is an enlarged schematic view of the A area in the figure;

[0023] Figure 3 is a structure schematic view of a heat exchange unit provided by the utility model embodiment;

[0024] Figure 4 is a use state view of a waste heat recovery dust removal mechanism provided by the utility model embodiment. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following is further detailed to the utility model by combining with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0026] In order to solve the technical problems that the high-temperature waste gas generated by the rotary kiln for drying and calcining of the ceramic particles needs to be first introduced into a heat exchange device for heat recovery, and then introduced into a dust removal device for dust removal, the heat exchange device and the dust removal device are independent units, the volume is large, and a large space is occupied, the utility model provides a kind of waste heat recovery dust removal mechanism, can realize the dust removal device and heat exchange device are integrated in a mechanism, the mechanism can recover part of heat in hot gas flow, and hot gas flow is filtered, the mechanism can be applicable to the place of limited space.

[0027] Please refer to Figures 1-4 , Figures 1-4 It is an embodiment of the utility model a kind of waste heat recovery dust removal mechanism, including cylinder 1, dust removal unit 2 and heat exchange unit 3;Cylinder 1 has inner cavity 1a, gas inlet pipe 1b and gas outlet pipe 1c, gas inlet pipe 1b and gas outlet pipe 1c are all communicated with inner cavity 1a;Dust removal unit 2 has sleeve 21 and dust collection member 22, sleeve 21 is installed in inner cavity 1a, and has dust collection cavity and exhaust cavity, dust collection member 22 is installed in dust collection cavity, it is used to absorb dust in airflow and guide airflow to exhaust cavity, exhaust cavity is communicated with exhaust pipe 21a extending to the outside of inner cavity 1a;Heat exchange unit 3 is installed in inner cavity 1a, it is communicated with dust collection cavity and has gas inlet end, the airflow input by gas inlet end flows through heat exchange unit 3, dust collection cavity and exhaust cavity in turn, and is exported via exhaust pipe 21a.

[0028] In actual use, hot gas is input via gas inlet end, external airflow is transported to inner cavity 1a via gas inlet pipe 1b, when hot gas flows in heat exchange unit 3, hot gas can exchange heat with airflow in inner cavity 1a;Then, hot gas enters into dust collection cavity, dust collection member 22 can absorb dust in airflow and guide airflow to exhaust cavity, hot gas can be exported via exhaust pipe 21a;So that part of heat in hot gas can be recovered, and dust in hot gas can be effectively removed during the process that hot gas is input into cylinder 1 via gas inlet end and exported via exhaust pipe 21a.

[0029] It should be noted that, in an embodiment, the gas outlet pipe of the rotary kiln 5 is provided with a first air pump, the gas inlet end of the heat exchange unit 3 is communicated with the gas outlet pipe of the rotary kiln 5, the hot air inlet of the rotary kiln 5 is also provided with a second air pump, and the gas outlet pipe 1c of the cylinder 1 is communicated with the hot air inlet of the rotary kiln.

[0030] Specifically, after external airflow exchanges heat with hot airflow transported in heat exchange unit 3 in inner cavity, it can be transported into rotary kiln 5 for use, which can effectively reduce the loss of heat resources and achieve the purpose of energy saving and emission reduction.

[0031] It should be noted that the rotary kiln 5 is not limited to a certain specific structure, and in use, the material enters from the kiln tail, and as the kiln body rotates, the material gradually moves to the kiln head, and in the moving process, the material is subjected to high temperature and undergoes physical and chemical reactions, and finally completes the calcination or roasting process; the heat provided by the burner makes the temperature in the kiln reach the required high temperature, and the material rolls and mixes in the kiln, and is fully heated.

[0032] Specifically, the air inlet pipe 1b is used to guide the external airflow into the inner cavity, and the external airflow contacts the heat exchange unit 3 in the inner cavity, and can realize heat exchange with the hot airflow flowing in the heat exchange unit 3; in an embodiment, the air inlet pipe 1b is located on the side wall of the bottom of the cylinder body 1, and the air outlet pipe 1c is located on the side wall of the top of the cylinder body 1.

[0033] It should be noted that the dust collecting member 22 is not limited to a certain specific structure, and can only absorb dust in the airflow, and is not limited here.

[0034] In an embodiment, a partition plate 211 is fixedly arranged in the sleeve 21, and the sleeve 21 is divided into a dust collecting cavity and an exhaust cavity by the partition plate 211, and the exhaust cavity is located above the dust collecting cavity; the dust collecting member 22 includes a plurality of cloth bag barrels, and the open ends of the plurality of cloth bag barrels are fixedly connected with the partition plate 211; the dust in the hot airflow is filtered by the plurality of cloth bag barrels, and the dust is adsorbed on the cloth bag barrels, and the hot airflow can enter the exhaust cavity through the opening at the top of the cloth bag barrel.

[0035] In addition, in other embodiments, the dust collecting member 22 can also be a sleeve with a plurality of filter holes, and a filter film is sleeved on the outer side of the sleeve.

[0036] It should be noted that the heat exchange unit 3 is not limited to a certain specific structure, and in an embodiment, the heat exchange unit 3 includes a gas guide cover 31, a gas distribution cover 32, and a plurality of heat exchange pipes 33, the gas guide cover 31 and the gas distribution cover 32 are respectively arranged at opposite ends of the sleeve 21, the gas guide cover 31 and the side wall of the top end of the sleeve 21 enclose a first cavity, the gas distribution cover 32 and the side wall of the bottom end of the sleeve 21 enclose a second cavity, the plurality of heat exchange pipes 33 are distributed along the circumference of the sleeve 21 and communicate the first cavity and the second cavity, the gas guide cover 31 is connected with a gas conveying end extending to the outside of the cylinder body 1, and at least one air hole 21b is formed in the side wall of the sleeve 21 to communicate the second cavity and the dust collecting cavity.

[0037] In addition, in other embodiments, the gas guide cover 31 and the gas distribution cover 32 are fixedly connected with the inner wall of the cylinder body 1, and the first cavity and the second cavity are respectively formed between the gas guide cover 31 and the gas distribution cover 32 and the inner side wall of the cylinder body 1, and the gas guide cover 31 and the sleeve 21 are connected with a gas guide pipe, and the second cavity communicates with the dust collecting cavity through the gas guide pipe.

[0038] Further, the heat exchange pipe 33 is made of carbon steel pipe, of course, in other embodiments, the heat exchange pipe 33 can also be made of low alloy steel pipe, stainless steel pipe or copper alloy steel pipe.

[0039] On the basis of the above scheme, in order to improve the contact area of the airflow in the inner cavity and the outer side wall of the heat exchange pipe, specifically, each heat exchange pipe 33 is spaced apart in the axial direction and is provided with a plurality of heat exchange fins.

[0040] On the basis of the above scheme, in order to avoid the situation that the filter hole of the cloth bag cylinder is blocked when the dust adsorbed on the cloth bag cylinder is more; Specifically, the dust removal unit 2 further comprises a jet member 23, the jet member 23 is installed on the cylinder body 1, and the jet member 23 is used for outputting high-speed airflow towards the open end of each cloth bag cylinder, so as to shake off the dust adsorbed on each cloth bag cylinder.

[0041] In one embodiment, the jet member 23 comprises a high-pressure gas storage pipe 231, a gas guide pipe 232 and a high-pressure spray head 233, the high-pressure gas storage pipe 231 is installed on the cylinder body 1, the gas outlet end of the high-pressure gas storage pipe 231 is connected with the gas guide pipe 232, and the gas guide pipe 232 is arranged in the exhaust cavity and connected with a plurality of high-pressure spray heads 233, each high-pressure spray head 233 corresponds to the open end of each cloth bag cylinder.

[0042] It should be noted that the gas outlet end of the high-pressure gas storage pipe 231 is provided with a pulse valve, when the pulse valve is opened, the high-pressure airflow stored in the high-pressure gas storage pipe 231 can be output through the plurality of high-pressure spray heads 233, and the high-pressure airflow impacting the cloth bag cylinder can shake off the dust adsorbed on the cloth bag cylinder.

[0043] In addition, the bottom of the sleeve 21 penetrates to the outside of the cylinder body 1, the bottom of the sleeve 21 is provided with a dust discharging pipe 21c, and a dust discharging valve is installed on the dust discharging pipe 21c, by opening the dust discharging valve, the dust accumulated at the bottom of the sleeve 21 can be discharged.

[0044] It should be noted that the dust on the cloth bag cylinder is not limited to the way of using the jet member 23, other ways can also be used, which will not be described here.

[0045] On the basis of the above scheme, in order to ensure that the airflow transported into the inner cavity through the air inlet pipe 1b can be uniformly dispersed in the inner cavity 1a, specifically, at least one gas distribution plate 4 is fixedly arranged in the inner cavity 1a and between the air inlet pipe 1b and the air outlet pipe 1c, wherein a plurality of gas distribution holes are formed in the gas distribution plate 4, and after the airflow is transported into the inner cavity 1a through the air inlet pipe 1b, the airflow can pass through the plurality of gas distribution holes and flow upward.

[0046] In order to better understand the present application, the following will be combined with Figures 1-4The technical scheme of the utility model is explained in detail as follows:

[0047] The hot gas flow is input through the gas input end, and the hot gas flow can flow through the first cavity, the plurality of heat exchange pipes 33, the second cavity, the dust collection cavity and the exhaust cavity in sequence. The external gas flow is delivered into the inner cavity 1a through the gas inlet pipe 1b, and the external gas flow is in contact with the gas guide cover 31, the gas diffuser cover 32 and the plurality of heat exchange pipes 33, and can exchange heat with the hot gas flow flowing in the heat exchange unit 3. Then, the hot gas flow enters the dust collection cavity, and the plurality of cloth bag cylinders filter the dust in the hot gas flow, so that the dust is adsorbed on the cloth bag cylinders. The hot gas flow can enter the exhaust cavity through the opening at the top of the cloth bag cylinder and be output through the exhaust pipe. After the mechanism operates for a period of time, the high-pressure gas flow released in the high-pressure gas storage pipe 231 can be sprayed out from the high-pressure nozzle 233 towards the opening of the cloth bag cylinder, so that the dust adsorbed on the cloth bag cylinder can be shaken off.

[0048] The specific implementation mode of the utility model described above does not constitute a limitation on the protection scope of the utility model. Any various other corresponding changes and modifications made according to the technical concept of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A waste heat recovery dust removal mechanism characterized by comprising: The application relates to a waste heat recovery and dust removal mechanism. The mechanism comprises a cylinder body, a dust removal unit and a heat exchange unit. The cylinder body has an inner cavity, an air inlet pipe and an air outlet pipe, and the air inlet pipe and the air outlet pipe are both connected with the inner cavity. The dust removal unit has a sleeve and a dust collection member. The sleeve is installed in the inner cavity and has a dust collection cavity and an exhaust cavity.

2. The waste heat recovery dust removal mechanism according to claim 1, characterized by, The dust collection member is installed in the dust collection cavity and is used for absorbing dust in the airflow and guiding the airflow to the exhaust cavity.

3. The waste heat recovery dust removal mechanism according to claim 2, characterized by, The exhaust cavity is connected with an exhaust pipe extending to the outside of the inner cavity.

4. The waste heat recovery dust removal mechanism according to claim 3, characterized by The heat exchange unit is installed in the inner cavity and is connected with the dust collection cavity and has a gas inlet end.

5. The waste heat recovery dust removal mechanism according to claim 2, wherein The airflow input through the gas inlet end sequentially flows through the heat exchange unit, the dust collection cavity and the exhaust cavity and is output through the exhaust pipe.

6. The waste heat recovery dust removal mechanism according to claim 5, wherein The sleeve is provided with a partition plate.

7. The waste heat recovery dust removal mechanism according to claim 6, wherein The partition plate separates the sleeve into the dust collection cavity and the exhaust cavity.

8. The waste heat recovery dust removal mechanism according to claim 1, wherein The dust collection member comprises a plurality of cloth bag cylinders.

9. The waste heat recovery dust removal mechanism according to claim 3, wherein The open ends of the cloth bag cylinders are fixedly connected with the partition plate.

10. A rotary kiln characterized by, The heat exchange unit comprises a gas guide cover, a gas distribution cover and a plurality of heat exchange pipes. The gas guide cover and the gas distribution cover are respectively installed at opposite ends of the sleeve. The gas guide cover and the side wall of the top end of the sleeve enclose a first cavity. The gas distribution cover and the side wall of the bottom end of the sleeve enclose a second cavity. The plurality of heat exchange pipes are distributed along the circumference of the sleeve and are connected with the first cavity and the second cavity. The gas guide cover is connected with a gas inlet end extending to the outside of the cylinder body. The side wall of the sleeve is provided with at least one air hole for connecting the second cavity with the dust collection cavity. Each heat exchange pipe is provided with a plurality of heat exchange fins in the axial direction. The dust removal unit further comprises a gas jetting member. The gas jetting member is installed in the cylinder body. The gas jetting member is used for outputting high-speed airflow to the open ends of the cloth bag cylinders to shake off the dust adsorbed on the cloth bag cylinders. The gas jetting member comprises a high-pressure gas storage pipe, a gas guide pipe and a high-pressure jet head. The high-pressure gas storage pipe is installed in the cylinder body. The gas outlet end of the high-pressure gas storage pipe is connected with the gas guide pipe. The gas guide pipe is arranged in the exhaust cavity and is connected with the plurality of high-pressure jet heads. Each high-pressure jet head corresponds to the open end of each cloth bag cylinder. The bottom of the sleeve extends to the outside of the cylinder body. The bottom of the sleeve is provided with a dust discharging pipe. A dust discharging valve is installed on the dust discharging pipe. At least one gas distribution plate is fixedly arranged in the inner cavity between the air inlet pipe and the air outlet pipe. The heat exchange pipe is a carbon steel pipe, a low-alloy steel pipe, a stainless steel pipe or a copper alloy steel pipe. The mechanism comprises the waste heat recovery and dust removal mechanism. The gas inlet end of the heat exchange unit is connected with the exhaust pipe of the rotary kiln. The air outlet pipe of the cylinder body is connected with the hot air inlet of the rotary kiln.

Images