CN220602147U - Nitrogen recycling device for cooling section of roller kiln - Google Patents

Abstract

The utility model relates to a kiln technical field discloses a cooling section nitrogen gas recycling device for roller bed kiln, including roller bed kiln, roller bed kiln includes the intensification section, heat preservation section and the cooling section that the material loops through, the cooling section includes high temperature region and low temperature region, the nitrogen gas temperature in high temperature region is higher than the nitrogen gas temperature in low temperature region, low temperature region exhaust nitrogen gas is introduced through circulating line in the intensification section. The nitrogen pressure value at the junction of the heat preservation section and the cooling section is highest, and nitrogen in the heating section and the heat preservation section is exhausted from the furnace mouth end of the roller kiln; or the nitrogen pressure value at the junction of the high temperature area and the low temperature area is highest, and the nitrogen in the heating section, the heat preservation section and the high temperature area is exhausted from the furnace mouth end of the roller kiln. The nitrogen gas consumption can be reduced, and production cost is saved.

Description

Nitrogen recycling device for cooling section of roller kiln

Technical Field

The application relates to the technical field of kilns, in particular to a nitrogen recycling device for a cooling section of a roller kiln.

Background

Roller kiln technology in China starts to develop from the 90 s, and is widely applied to a plurality of industries such as ceramics, electronics and the like. Roller kilns have been the most commonly used kiln type in recent years in the production of lithium ion battery materials. During the manufacturing process of the battery material, the intermediate is often subjected to high temperature sintering to form the final lithium ion electrode material. Roller kilns require different gases to create a gaseous environment, depending on the materials produced. Taking lithium ion battery materials as an example, common gases are air (used for preparing lithium cobaltate), oxygen (used for preparing high-nickel ternary cathode materials), and nitrogen (used for preparing lithium iron phosphate or lithium manganese iron phosphate, etc.). In the sintering step, most of the manufacturing cost is from the usage amount of the non-air gas and the heat carried away by the non-air gas. Therefore, reasonable use of gas is critical to both product quality and manufacturing costs.

The roller kiln can be roughly divided into a heating section, a heat preservation section and a cooling section according to temperature division. In the temperature rising section, the furnace temperature rises with a faster gradient. The temperature in the holding section remains almost the same. The furnace temperature in the cooling section is reduced in a faster gradient. In an existing roller kiln, an air inlet system for air inlet is arranged, the air inlet system generally feeds air at each temperature Duan Jun, an exhaust pipeline arranged at the kiln head and an exhaust system arranged at the kiln tail are used for exhaust, the exhaust air volume of the kiln head is 1000-3000 m < 3 >/h, the exhaust air volume of the kiln tail is 1000-3000 m < 3 >/h, and the air flow mode enables nitrogen to be directly discharged from the kiln head and the kiln tail, so that a large amount of waste of air and heat in each temperature section is caused.

Disclosure of Invention

The embodiment of the application aims to provide a nitrogen recycling device for a cooling section of a roller kiln, which solves the technical problem of great waste of gas and heat in each temperature section in the existing kiln, and achieves the technical effect of reducing the waste of gas in the roller kiln.

The embodiment of the application provides a cooling section nitrogen gas back utilization equipment for roller table kiln, including roller table kiln, roller table kiln includes the intensification section, heat preservation section and the cooling section that the material loops through, the cooling section includes high temperature region and low temperature region, the nitrogen gas temperature in high temperature region is higher than the nitrogen gas temperature in low temperature region, low temperature region exhaust nitrogen gas is introduced through circulating line in the intensification section.

In one possible implementation manner, the nitrogen pressure value at the junction of the heat preservation section and the cooling section is highest, and nitrogen in the heating section and the heat preservation section is exhausted from the furnace mouth end of the roller kiln; or the nitrogen pressure value at the junction of the high temperature area and the low temperature area is highest, and the nitrogen in the heating section, the heat preservation section and the high temperature area is exhausted from the furnace mouth end of the roller kiln.

In another possible implementation manner, a plurality of circulating fans are arranged in the low-temperature area and are used for driving nitrogen to circulate in the low-temperature area.

In another possible implementation, the nitrogen gas cooling system comprises a plurality of circulating fan groups arranged along the length direction of the low-temperature zone, wherein each circulating fan group comprises a plurality of circulating fans, and each circulating fan group drives nitrogen gas to flow along the inner ring of the cross section of the low-temperature zone.

In another possible implementation manner, each circulating fan group comprises an upper circulating fan arranged above a material conveying area of the roller kiln and a lower circulating fan arranged below the material conveying area of the roller kiln, and the upper circulating fan and the lower circulating fan drive nitrogen to circularly flow around the material conveying area of the roller kiln.

In another possible implementation manner, the circulating pipeline is provided with a pipeline fan, the circulating pipeline is embedded and arranged in the bottom plate of the roller kiln, and the circulating pipeline sequentially passes through the cooling section, the heat preservation section and the heating section.

In another possible implementation, the circulation pipes each include a plurality of branch pipes each embedded in a floor of the roller kiln.

In another possible implementation manner, heat exchange fins are connected between the branch pipelines, the heat exchange fins are embedded in the bottom plate of the roller kiln, and two sides of each heat exchange fin are connected with the outer side walls of the branch pipelines.

In another possible implementation manner, the heat preservation section is connected with a heat preservation section air inlet pipeline for introducing nitrogen fresh air, a plate type gas heat exchanger is arranged between the heat preservation section air inlet pipeline and the circulating pipeline, the plate type gas heat exchanger is used for exchanging heat between the heat preservation section air inlet pipeline and the circulating pipeline, and the plate type gas heat exchanger is arranged close to the tail end of the furnace.

In another possible implementation manner, a plurality of lateral air outlet pipes are arranged on the side wall of the low-temperature area along the length direction of the low-temperature area, the tail end of each lateral air outlet pipe is connected with a flexible middle pipe, a filter pipe is connected to the middle pipe, a filter core is arranged in the filter pipe, a plurality of lateral air inlet pipes are connected to the circulation pipe, and the lateral air inlet pipes are connected with the filter pipes in a one-to-one correspondence manner.

Compared with the prior art, the embodiment of the application has the beneficial effects that:

the embodiment of the application provides a cooling section nitrogen gas back utilization equipment for roller bed kiln, including roller bed kiln, roller bed kiln includes the material temperature rising section that loops through, heat preservation section and cooling section, and the cooling section includes high temperature region and low temperature region, and the nitrogen gas temperature in high temperature region is higher than the nitrogen gas temperature in low temperature region, and low temperature region exhaust nitrogen gas is introduced in the temperature rising section through circulating line. Because the nitrogen temperature of the low-temperature area of the cooling section is relatively low, common pipeline transportation can be used, so that nitrogen in the low-temperature area of the cooling section can directly enter the heating section again for reuse, the utilization rate of the nitrogen is improved, the waste of the nitrogen is reduced, and the production cost of the roller kiln in the operation process is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a nitrogen utilization system of a roller kiln in the prior art;

fig. 2 is a schematic structural diagram of a nitrogen recycling device for a cooling section of a roller kiln according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a system configuration for nitrogen utilization in another roller kiln of the prior art;

FIG. 4 is a schematic structural view of another nitrogen recycling device for a cooling section of a roller kiln according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a low-temperature region of a roller kiln according to an embodiment of the present application;

FIG. 6 is a schematic view of the structure of section A-A of the low temperature zone of the roller kiln of FIG. 5;

FIG. 7 is a schematic diagram of a front view of a lateral arrangement in an embodiment of the present application;

FIG. 8 is a schematic top view of a lateral conduit arrangement in an embodiment of the present application;

FIG. 9 is a schematic structural view of another nitrogen recycling device for a cooling section of a roller kiln according to an embodiment of the present application;

FIG. 10 is a schematic view of a partial structure of another nitrogen recycling device for a cooling section of a roller kiln at a low temperature area according to an embodiment of the present application;

in the figure, 100, a heating section; 200. a heat preservation section; 201. an air inlet pipeline of the heat preservation section; 210. a plate-type gas heat exchanger; 300. a cooling section; 310. a high temperature zone; 320. a low temperature zone; 321. a circulation pipe; 322. a circulating fan; 330. a circulation fan unit; 331. a circulating fan is arranged; 332. a lower circulation fan; 340. a duct fan; 350. a branch pipe; 351. heat exchange fins; 360. a lateral air outlet pipe; 361. a middle tube; 362. a filter tube; 363. a filter element; 370. a lateral air inlet pipe; 400. a roller kiln; 410. a furnace mouth end; 420. a furnace tail end; 430. and a material conveying area.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.

It will be understood that when an element or structure is referred to as being "mounted" or "disposed" on another element or structure, it can be directly on the other element or structure or be indirectly on the other element or structure. When an element or structure is referred to as being "connected to" another element or structure, it can be directly connected to the other element or structure or be indirectly connected to the other element or structure.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present application and simplify description, and do not indicate or imply that the device or a component or structure being referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Each section of the roller kiln can be roughly divided into a heating section, a heat preservation section and a cooling section according to temperature division. In the heating section, the furnace temperature of the roller kiln rises at a relatively high speed. In the heat preservation section, the furnace temperature of the roller kiln is almost unchanged. In the cooling section, the furnace temperature of the roller kiln is reduced at a relatively high speed.

The roller kiln can be roughly divided into a heating section, a heat preservation section and a cooling section according to temperature division. In the temperature rising section, the furnace temperature rises with a faster gradient. The temperature in the holding section remains almost the same. The furnace temperature in the cooling section is reduced in a faster gradient. In the existing roller kiln, an air inlet system for air inlet is arranged, the air inlet system generally feeds air at each temperature Duan Jun, an exhaust pipeline arranged at the kiln head and an exhaust system arranged at the kiln tail are used for exhaust, the exhaust air volume of the kiln head is 1000-3000 m < 3 >/h, and the exhaust air volume of the kiln tail is 1000-3000 m < 3 >/h.

Specifically, as shown in fig. 1, the existing roller kiln is respectively provided with air inlet at a heating section, a heat preservation section and a cooling section, and is provided with air exhaust near a furnace end (a material inlet) and a furnace tail (a material outlet). The disadvantage of this solution is that the gas flow pattern allows nitrogen to be directly discharged from the kiln head and tail, resulting in a significant waste of gas (e.g. nitrogen) in each temperature zone.

Based on the above reasons, the embodiment of the application provides a cooling section nitrogen gas recycling device for roller kiln, including roller kiln, roller kiln includes the material and loops through intensification section, heat preservation section and the cooling section, and the cooling section includes high temperature region and low temperature region, and the nitrogen gas temperature in high temperature region is higher than the nitrogen gas temperature in low temperature region, and low temperature region exhaust nitrogen gas is introduced in the intensification section through circulating line. Because the nitrogen temperature of the low-temperature area of the cooling section is relatively low, common pipeline transportation can be used, so that nitrogen in the low-temperature area of the cooling section can directly enter the heating section again for reuse, the utilization rate of the nitrogen is improved, the waste of the nitrogen is reduced, and the production cost of the roller kiln in the operation process is reduced.

In some scenes, the embodiments of the present application may be applied to gas roller kilns that use air (used to prepare lithium cobaltate), oxygen (used to prepare high-nickel ternary positive electrode materials), nitrogen (used to prepare lithium iron phosphate or lithium manganese iron phosphate, etc.), and the like, and the embodiments of the present application are not limited to roller kilns that use nitrogen as a protective gas, and roller kilns that use other gases as protective gases are all within the scope of the present application.

The nitrogen recycling device for the cooling section of the roller kiln provided by the embodiment of the application is specifically described below by combining specific examples.

As shown in fig. 2, fig. 2 is a schematic structural diagram of a nitrogen efficient recycling system of a roller kiln provided in an embodiment of the present application, where the embodiment of the present application includes a roller kiln 400, the roller kiln 400 includes a heating section 100, a heat insulation section 200 and a cooling section 300 through which materials sequentially pass, the cooling section 300 includes a high temperature region 310 and a low temperature region 320, the nitrogen temperature of the high temperature region 310 is higher than the nitrogen temperature of the low temperature region 320, and nitrogen discharged from the low temperature region 320 is introduced into the heating section 100 through a circulation pipeline 321.

The embodiments of the present application may be applied, for example, to roller kilns designed for the production of lithium iron phosphate or lithium manganese iron phosphate-based materials.

As shown in fig. 2, roller kiln 400 may be used to form the final lithium ion electrode material by high temperature sintering. The roller kiln 400 comprises a heating section 100, a heat preservation section 200 and a cooling section 300 which are sequentially connected, wherein the heating section 100 is used for heating materials in the roller kiln 400, the heat preservation section 200 is used for heat preservation treatment of the materials in the roller kiln 400, and the cooling section 300 is used for reducing the temperature of the materials in the roller kiln 400 and taking heat away through gas. In the process of sintering materials, most of the manufacturing cost is from the amount of gas (non-air) in the kiln and the heat carried away by the gas (non-air).

In the cool down section 300, the material passes through a high temperature zone 310 and a low temperature zone 320 in sequence. In the high temperature zone 310, the temperature of the material is relatively high, and heat radiation is the primary means of material cooling. In the low temperature zone 320, after the temperature of the material is reduced, the contact conduction between the gas in the roller kiln and the material and the sagger carrying the material becomes the main means of reducing the temperature, so that the demand for the gas flow in the low temperature zone 320 becomes high, and a water cooling pipeline can be arranged in the low temperature zone 320 to cool the gas in the kiln.

The tail end of the low temperature zone 320 is the furnace tail end 420 of the roller kiln 400, and nitrogen discharged from the low temperature zone 320 is introduced into the heating section 100 through the circulating pipeline 321, so that the gas in the low temperature zone 320 can enter the heating section 100 along the circulating pipeline 321.

The beneficial effects that above realization mode brought lie in, when this application embodiment is in use, compare in the technical scheme that shows in fig. 1, this application embodiment can directly introduce the nitrogen gas of stove tail end 420 into heating section 100, reaches the effect of practicing thrift nitrogen gas use amount. Meanwhile, the nitrogen in the low-temperature zone 320 is already heated in the low-temperature zone 320, so that the nitrogen consumes less energy to be heated after entering the temperature raising section 100, and the energy saving effect of the embodiment of the application is improved.

It should be noted that, in the embodiment of the present application, the temperature of the gas collected at the tail end 420 is low enough, the stainless steel pipeline with heat preservation can be used to convey the gas discharged from the tail end 420, and the purity of the nitrogen discharged from the tail end 420 is high, and the gas can be compressed by the compressed air machine to accelerate the conveying speed of the gas discharged from the tail end 420.

In the insulation section 200, the amount of gas required is relatively small, the heat exchange is mainly performed by radiation, the waste gas released by the material is small, and the excessive air flow can adversely affect the uniformity of the temperature field.

As shown in fig. 3, another conventional roller kiln is provided with air intake at a temperature raising section, a temperature maintaining section and a temperature lowering section, respectively, and air exhaust near a furnace end (a material inlet). The disadvantage of this solution is that a lot of nitrogen enters the insulation section from the cooling section, the gas entering the insulation section from the cooling section influences the stability of the temperature field of the insulation section, and a lot of energy is consumed for heating the gas entering the insulation section from the cooling section.

Therefore, according to the prior art, the beneficial effects brought by the implementation mode are that the nitrogen gas high-efficiency recycling system of the roller kiln in the embodiment of the application is adopted, so that concentrated exhaust of gas near a furnace end (a material inlet) can be avoided, a large amount of nitrogen gas is prevented from entering the heat preservation section 200 from the cooling section 300, the stability of the temperature field of the heat preservation section 200 can be prevented from being influenced by the gas entering the heat preservation section 200 from the cooling section 300, and the product production quality and the stability of the product quality in use of the embodiment of the application are improved.

Therefore, the beneficial effect that above realization mode brought also lies in, use the nitrogen gas high-efficient reuse system of roll table kiln among this application embodiment, the nitrogen gas supply volume of low temperature zone 320 of cooling section 300 is higher, can get into the nitrogen gas flow direction furnace tail of furnace body with cooling section 300, collect the back at the furnace tail section and send to heating section 100 to as the main nitrogen source of heating section 100, heat preservation section 200 and cooling section 300 can through supplying a small amount of fresh nitrogen gas, the nitrogen gas use amount of heat preservation section 200 and cooling section 300 has been reduced, greatly reduced the manufacturing cost of product.

Illustratively, the temperatures of the various zones within the roller kiln 400 may be:

the temperature in the warm-up section 100 ranges from room temperature to the highest temperature of the kiln (500-1300 c). The temperature in the holding section 200 is typically between 500-1300 ℃. In the cooling section, the temperature in the kiln is gradually reduced to near room temperature.

In some implementations, the nitrogen pressure value at the interface of the soak zone 200 and the cool-down zone 300 is highest, and the nitrogen within both the warm-up zone 100 and the soak zone 200 is exhausted from the mouth end 410 of the roller kiln 400.

When the embodiment of the application is used, as shown in fig. 2, the nitrogen pressure value at the junction of the heat preservation section 200 and the cooling section 300 is controlled to be the highest point of the gas pressure in the roller kiln 400, and the gas in the roller kiln 400 can flow from the tail end of the heat preservation section 200 to the furnace mouth end 410 and from the tail end of the cooling section 300 to the furnace tail end 420 because the gas always flows from the high pressure area to the low pressure area, so that the gas in the roller kiln 400 can flow from the tail end of the heat preservation section 200 to the furnace mouth end 410 by taking the junction of the heat preservation section 200 and the cooling section 300 as the starting point.

The beneficial effects brought by the implementation manner are that a large amount of organic matters can be generated in the material in the heating section 100 in the heating process and enter the gas, so that the gas in the heating section 100 and the heat preservation section 200 flows from the tail end of the heat preservation section 200 towards the furnace mouth end 410, the organic matters in the gas in the heating section 100 are ensured to be timely discharged out of the roller kiln 400 from the furnace mouth end 410, the gas cleanliness in the heat preservation section 200 of the roller kiln 400 is improved, and the production quality of products is improved. Meanwhile, organic matters in the heating section 100 can be prevented from entering the heat preservation section 200 and the cooling section 300, so that the cleanliness of gas in the heat preservation section 200 and the cooling section 300 is ensured, and the cleanliness of the roller kiln 400 in the use process is improved.

The beneficial effect that above realization mode brought also lies in, because the gas in the cooling section 300 flows from the terminal of heat preservation section 200 towards stove tail end 420, has avoided the higher gas of temperature in the heat preservation section 200 to get into in the cooling section 300, has improved the cooling rate to the material in the cooling section 300, has improved the production efficiency of product.

Meanwhile, the beneficial effects brought by the implementation manner are that the gas in the cooling section 300 can not enter into the gas in the heat preservation section 200 in a large amount, so that the gas entering the heat preservation section 200 from the cooling section 300 can be prevented from influencing the stability of the temperature field of the heat preservation section 200, and the product production quality and the stability of the product quality in use of the embodiment of the application are improved.

In some implementations, the nitrogen pressure value at the interface of the high temperature zone 310 and the low temperature zone 320 is highest, and nitrogen within the warm section 100, the warm section 200, and the high temperature zone 310 is exhausted from the mouth end 410 of the roller kiln 400.

When the embodiment of the application is used, the nitrogen pressure value at the junction of the high-temperature area 310 and the low-temperature area 320 is controlled to be the highest point of the gas pressure in the roller kiln 400, and the gas in the roller kiln 400 can flow from the tail end of the high-temperature area 310 to the furnace mouth end 410 and the gas in the low-temperature area 320 can flow from the tail end of the high-temperature area 310 to the furnace tail end 420 because the gas always flows from the high-pressure area to the low-pressure area, so that the gas in the roller kiln 400 can take the junction of the high-temperature area 310 and the low-temperature area 320 as the starting point.

The beneficial effects brought by the implementation manner are that a large amount of organic matters can be generated in the materials in the heating section 100 in the heating process and enter the gas, so that nitrogen in the heating section 100, the heat preservation section 200 and the high temperature section 310 flows from the tail end of the high temperature section 310 towards the furnace mouth end 410, the organic matters in the gas in the heating section 100 are ensured to be timely discharged out of the roller kiln 400 from the furnace mouth end 410, the gas cleanliness in the heat preservation section 200 of the roller kiln 400 is improved, and the production quality of products is improved. Meanwhile, organic matters in the heating section 100 can be prevented from entering the heat preservation section 200 and the cooling section 300, so that the cleanliness of gas in the heat preservation section 200 and the cooling section 300 is ensured, and the cleanliness of the roller kiln 400 in the use process is improved.

The beneficial effects brought by the implementation manner are that the nitrogen in the heating section 100, the heat preservation section 200 and the high temperature region 310 flows from the tail end of the high temperature region 310 towards the gas flow direction of the furnace mouth end 410, and the gas in the low temperature region 320 flows from the tail end of the heat preservation section 200 towards the furnace tail end 420, so that the gas with higher temperature in the heat preservation section 200 is prevented from entering the cooling section 300, the cooling speed of materials in the cooling section 300 is improved, and the production efficiency of products is improved.

In some implementations, a plurality of circulation fans 322 are disposed within the low temperature zone 320, and the plurality of circulation fans 322 are configured to drive the circulation of nitrogen within the low temperature zone 320.

In use, as shown in fig. 4, since the temperature of the gas in the low temperature zone 320 is already low, the temperature in the low temperature zone 320 is generally lower than 300 ℃, so that the circulating fan 322 can efficiently circulate the gas flow in the low temperature zone 320 by disposing the heat-resistant circulating fan 322 in the low temperature zone 320.

Illustratively, the number of circulation fans 322 may be one, and the number of circulation fans 322 may be at least two.

The beneficial effects that above realization mode brought lie in, when this application embodiment is in use, through a plurality of circulating fans 322 drive air current in the low temperature zone 320 in low temperature zone 320 circulation flow for the velocity of flow of the gas in the low temperature zone 320 is accelerated, has reached the purpose of accelerating the air current flow and improving the cooling effect to the material. Meanwhile, the flow rate of the gas in the low-temperature region 320 is accelerated, so that the heat exchange effect between the gas and the material is improved, the gas supply amount required by the material cooling in the low-temperature region 320 is reduced on the premise of the same heat dissipation requirement, and the effect of saving the production cost is achieved.

In some implementations, a plurality of circulation fan units 330 are included along the length of the low temperature zone 320, each circulation fan unit 330 including at least a number of circulation fans, each circulation fan unit 330 driving a circular flow of nitrogen along the cross-section of the low temperature zone 320.

Fig. 5 is a schematic top view of the low temperature zone 320 in some implementations, as shown in fig. 5, a plurality of circulating fan units 330 are disposed along a length direction of the low temperature zone 320, so that the plurality of circulating fan units 330 can simultaneously play a role in promoting airflow movement in the low temperature zone 320, and each circulating fan unit 330 includes a plurality of circulating fans 322, so that the plurality of circulating fans 322 in each circulating fan unit 330 can cooperate to drive airflow movement in the low temperature zone 320.

Illustratively, each circulation fan assembly 330 may include one circulation fan 322, and each circulation fan assembly 330 may also include more than two circulation fans 322.

Wherein each circulation fan assembly 330 drives a circular flow of nitrogen gas along the cross-section of the low temperature zone 320 such that the gas flow is circular in multiple cross-sections along the length of the low temperature zone 320.

The beneficial effects that above realization mode brought lie in, the air current flows in the annular along the length direction's of low temperature zone 320 a plurality of cross sections, guaranteed to all can carry out efficient heat exchange in the length direction's of low temperature zone 320 a plurality of cross sections, further improved the radiating efficiency of nitrogen gas to the material in the low temperature zone, reduced the use amount of nitrogen gas, reduced manufacturing cost.

In some implementations, each circulation fan set 330 includes an upper circulation fan 331 disposed above the material delivery area 430 of the roller kiln 400 and a lower circulation fan 332 disposed below the material delivery area 430 of the roller kiln 400, the upper and lower circulation fans 331, 332 driving nitrogen to flow annularly around the material delivery area 430 of the roller kiln 400.

FIG. 6 is a schematic view of a cross-sectional structure of the circulating fan unit in FIG. 5, and as shown in FIG. 6, the circulating fan unit 330 drives nitrogen to circulate on the cross-section of the circulating fan unit in the low temperature zone 320, thereby improving the heat dissipation effect of the nitrogen on the material conveying area 430 in the low temperature zone 320.

As shown in fig. 6, an upper circulation fan 331 disposed above the material transferring area 430 of the roller kiln 400 may be disposed at the right upper corner of the cross section of the low temperature zone 320, the upper circulation fan 331 being provided with an upper air inlet disposed toward the lower side and an upper air outlet disposed toward the left side of the cross section of the low temperature zone 320, nitrogen being sucked into the upper air inlet of the upper circulation fan 331 from the lower side and being discharged from the upper air outlet of the upper circulation fan 331.

As shown in fig. 6, a lower circulation fan 332 disposed below the material transfer area 430 of the roller kiln 400 may be disposed at a lower left corner in the cross section of the low temperature zone, the lower circulation fan 332 being provided with a lower air inlet disposed toward the upper side and a lower air outlet disposed toward the right side of the cross section of the low temperature zone 320, nitrogen gas being sucked into the lower air inlet of the lower circulation fan 332 from above and discharged from the lower air outlet of the lower circulation fan 332.

The material conveying area 430 is used for conveying materials and performing water cooling circulation cooling on the conveyed materials, for example, the material conveying area 430 may include a water cooling pipe group, a roller way and a sagger for containing the materials, which are sequentially arranged from bottom to top.

The beneficial effect that above realization mode brought lies in, through last circulation fan 331 and lower circulation fan 332 drive nitrogen gas around the material transportation area 430 annular flow of roller kiln 400, has further improved the radiating efficiency of nitrogen gas to the material in low temperature zone 320, can reduce the required nitrogen gas volume of radiating the material in low temperature zone 320, has further reduced the manufacturing cost of product.

In some implementations, a pipeline fan 340 is arranged on the circulating pipeline 321, the circulating pipeline 321 is embedded in the bottom plate of the roller kiln 400, and the circulating pipeline 321 sequentially passes through the cooling section 300, the heat preservation section 200 and the heating section 100.

When the device is used, the bottom plate of the roller kiln 400 is often paved with the refractory bricks, so that the bottom temperature of the roller kiln 400 is often higher, but the bottom of the roller kiln 400 does not directly heat materials, and the bottom of the roller kiln 400 easily emits heat to the ground, so that the circulating pipeline 321 is embedded in the bottom plate of the roller kiln 400, the circulating pipeline 321 can absorb heat in the bottom plate of the roller kiln 400, and the gas in the circulating pipeline 321 is heated.

In addition, when installing the circulation pipeline 321, the circulation pipeline 321 can be directly installed in the bottom plate of the roller kiln 400 in advance in a buried embedding mode, so that the installation of the circulation pipeline 321 does not occupy space outside the roller kiln 400, the size of the space occupied by the roller kiln 400 is reduced, and the convenience of the device in use is improved.

Specifically, the bottom plate of the roller kiln 400 can be formed by paving refractory bricks, and the bottom plate of the roller kiln 400 can also protect the circulating pipeline 321.

The beneficial effects that the realization mode mentioned above brought lie in, pipeline fan 340 is used for driving the air current to flow in circulation pipeline 321, and circulation pipeline 321 passes through cooling section 300, heat preservation section 200 and intensification section 100 in proper order for circulation pipeline 321 passes through cooling section 300, heat preservation section 200 and intensification section 100 absorption heat in proper order, has realized the effective heating to the interior gaseous of circulation pipeline 321, has improved the recovery effect to the heat that the roller bed kiln lost.

In some implementations, the circulation pipes 321 each include a plurality of branch pipes 350, and the plurality of branch pipes 350 are each embedded within the floor of the roller kiln 400.

As shown in fig. 7 and 8, when the embodiment of the application is used, the plurality of branch pipelines 350 are used for reducing the diameter of the circulating pipeline 321 when conveying gas, so that the contact area between the circulating pipeline 321 and the bottom plate of the roller kiln 400 is increased, and the heat exchange effect between the bottom plate of the roller kiln 400 and the circulating pipeline 321 is improved. Meanwhile, the diameter of the circulating pipeline 321 is reduced, the structural strength of the circulating pipeline 321 is also improved, and the service life of the circulating pipeline 321 is prolonged.

In some implementations, heat exchange fins 351 are connected between the branch pipes 350, the heat exchange fins 351 are embedded in the bottom plate of the roller kiln 400, and two sides of the heat exchange fins 351 are connected with the outer side walls of the branch pipes 350.

As shown in fig. 7, when the embodiment of the application is used, the heat exchange fins 351 are used for exchanging heat between the branch pipeline 350 and the roller kiln 400, so that the heat exchange fins 351 can absorb heat in the bottom plate of the roller kiln 400 in a larger range, and heat is transferred from the bottom plate of the roller kiln 400 to the branch pipeline 350 through the heat exchange fins 351, thereby improving the heating effect of gas in the branch pipeline 350 when the branch pipeline 350 is used, and improving the practical effect of the device.

Specifically, the heat exchange fins 351 may be directly connected between the branch conduits 350 in a sleeved manner, such that the heat exchange fins 351 can support the branch conduits 350, while the heat exchange fins 351 can also exchange heat between the branch conduits 350.

In some implementations, a heat-preserving section air inlet pipeline 201 for introducing nitrogen fresh air is connected to the heat-preserving section 200, a plate type gas heat exchanger 210 is arranged between the heat-preserving section air inlet pipeline 201 and the circulating pipeline 321, the plate type gas heat exchanger 210 is used for exchanging heat between the heat-preserving section air inlet pipeline 201 and the circulating pipeline 321, and the plate type gas heat exchanger 210 is arranged near the furnace tail end 420.

As shown in fig. 2, when the embodiment of the application is used, nitrogen fresh air is introduced into the heat preservation section 200 through the heat preservation section air inlet pipeline 201, so that the heat preservation section air inlet pipeline 201 of the heat preservation section 200 continuously protects materials in the heat preservation section 200 through the nitrogen fresh air.

Meanwhile, the plate-type gas heat exchanger 210 is used for exchanging heat between the heat-preserving section air inlet pipeline 201 and the circulating pipeline 321, and the plate-type gas heat exchanger 210 is arranged close to the furnace tail end 420, so that the air flow exhausted by the circulating pipeline 321 can heat the air flow exhausted by the heat-preserving section air inlet pipeline 201, the energy-saving effect of the embodiment of the application is improved, and the production quality of a product when the embodiment of the application is used is also improved.

The beneficial effect that foretell realization mode brought lies in, when using, because when the fresh air of nitrogen gas is input to heat preservation section 200 through heat preservation section admission line 201, the fresh air of nitrogen gas is the fresh nitrogen that does not have used generally, but the temperature of fresh air of nitrogen gas is often lower, this device is through setting up the heat transfer of plate gas heat exchanger 210 between the fresh air of nitrogen gas and low temperature zone 320 exhaust gas, the heating to the fresh air of nitrogen gas has been realized, the local temperature that the fresh air of nitrogen gas got into in the heat preservation section 200 changes excessively, temperature stability in the heat preservation section 200 in this device has been improved, temperature fluctuation in the heat preservation section 200 has been avoided, production quality when the roller kiln sintering product has been improved.

In some implementations, a plurality of lateral air outlet pipes 360 are arranged on the side wall of the low-temperature zone 320 along the length direction of the low-temperature zone 320, the tail end of each lateral air outlet pipe 360 is connected with a flexible middle pipe 361, the middle pipe 361 is connected with a filter pipe 362, a filter element 363 is arranged in the filter pipe 362, a plurality of lateral air inlet pipes 370 are connected to the circulating pipeline 321, and the lateral air inlet pipes 370 are connected with the filter pipes 362 in a one-to-one correspondence manner.

In use, as shown in fig. 10, the lateral outlet pipe 360 is used to draw gas from the side wall of the low temperature zone 320, the filter tube 362 is used to filter the gas exiting the middle tube 361, and the filter cartridge 363 is used to directly filter the gas within the filter tube 362. The lateral air outlet pipe 360 and the lateral air inlet pipe 370 can be matched with each other to introduce air into the circulating pipeline 321, and the lateral air inlet pipe 370 is connected with the filter pipes 362 in a one-to-one correspondence manner, so that the air can enter the lateral air outlet pipe 360 after being filtered by the filter element 363.

When the embodiment of the application is used, gas can be introduced into the circulating pipeline 321 through the lateral gas outlet pipes 360, and can be filtered through the filter element 363, so that the cleanliness of the gas is improved, and the circulating pipeline 321 is prevented from being blocked.

Meanwhile, when the filter element 363 in the lateral air outlet pipe 360 needs to be replaced, the lateral air outlet pipe 360 and the middle pipe 361 can be detached and separated, and the middle pipe 361 can be bent, so that the filter element 363 in the lateral air outlet pipe 360 can be replaced conveniently, and the filter element 363 in the lateral air outlet pipe 360 is replaced conveniently.

Specifically, the intermediate pipe 361 may be made of a heat-resistant corrugated pipe.

Specifically, the lateral inlet pipe 370 and the filter pipe 362 may be screwed.

The foregoing description of the preferred embodiments of the present application is not intended to be limiting, but is intended to cover any and all modifications, equivalents, and alternatives falling within the spirit and principles of the present application.

Claims (10)

1. A cooling section nitrogen gas recycling device for roller bed kiln, its characterized in that, including roller bed kiln (400), roller bed kiln (400) are including material heating up section (100), heat preservation section (200) and cooling down section (300) that loop through, cooling down section (300) are including high temperature zone (310) and low temperature zone (320), the nitrogen gas temperature in high temperature zone (310) is higher than the nitrogen gas temperature in low temperature zone (320), low temperature zone (320) exhaust nitrogen gas is introduced through circulation pipeline (321) in heating up section (100).

2. The nitrogen recycling device for the cooling section of the roller kiln according to claim 1, wherein the nitrogen pressure value at the junction of the heat preservation section (200) and the cooling section (300) is highest, and nitrogen in the heating section (100) and the heat preservation section (200) is exhausted from the furnace mouth end (410) of the roller kiln (400); or,

the nitrogen pressure value at the junction of the high temperature zone (310) and the low temperature zone (320) is highest, and nitrogen in the heating section (100), the heat preservation section (200) and the high temperature zone (310) is exhausted from the furnace mouth end (410) of the roller kiln (400).

3. The nitrogen recycling device for the cooling section of the roller kiln according to claim 2, wherein a plurality of circulating fans (322) are arranged in the low temperature region (320), and the circulating fans (322) are used for driving nitrogen to circularly flow in the low temperature region (320).

4. A cool down section nitrogen recycling apparatus for roller kiln furnace as claimed in claim 3, characterized by comprising a plurality of circulation fan groups (330) arranged along the length direction of the low temperature zone (320), each circulation fan group (330) comprising a plurality of circulation fans (322), each circulation fan group (330) driving nitrogen gas to flow along the inner ring shape of the cross section of the low temperature zone (320).

5. The cooling section nitrogen recycling apparatus for a roller kiln according to claim 4, wherein each circulating fan group (330) comprises an upper circulating fan (331) arranged above a material conveying area (430) of the roller kiln (400) and a lower circulating fan (332) arranged below the material conveying area (430) of the roller kiln (400), and the upper circulating fan (331) and the lower circulating fan (332) drive nitrogen to circularly flow around the material conveying area (430) of the roller kiln (400).

6. The nitrogen recycling device for the cooling section of the roller kiln according to claim 5, wherein a pipeline fan (340) is arranged on the circulating pipeline (321), the circulating pipeline (321) is embedded in a bottom plate of the roller kiln (400), and the circulating pipeline (321) sequentially passes through the cooling section (300), the heat preservation section (200) and the heating section (100).

7. The cooling section nitrogen recycling apparatus for roller kiln according to claim 6, characterized in that the circulating pipes (321) each comprise a plurality of branch pipes (350), and the plurality of branch pipes (350) are each embedded in the bottom plate of the roller kiln (400).

8. The nitrogen recycling device for the cooling section of the roller kiln according to claim 7, wherein heat exchange fins (351) are connected between the branch pipelines (350), the heat exchange fins (351) are embedded in a bottom plate of the roller kiln (400), and two sides of the heat exchange fins (351) are connected with outer side walls of the branch pipelines (350).

9. The nitrogen recycling device for the cooling section of the roller kiln according to claim 8, wherein a heat preservation section air inlet pipeline (201) for introducing nitrogen fresh air is connected to the heat preservation section (200), a plate type gas heat exchanger (210) is arranged between the heat preservation section air inlet pipeline (201) and the circulating pipeline (321), the plate type gas heat exchanger (210) is used for exchanging heat between the heat preservation section air inlet pipeline (201) and the circulating pipeline (321), and the plate type gas heat exchanger (210) is arranged close to the tail end (420) of the kiln.

10. The nitrogen recycling device for the cooling section of the roller kiln according to claim 9, wherein a plurality of lateral air outlet pipes (360) which are arranged along the length direction of the low temperature area (320) are arranged on the side wall of the low temperature area (320), the tail end of each lateral air outlet pipe (360) is connected with a flexible middle pipe (361), the middle pipe (361) is connected with a filter pipe (362), a filter element (363) is arranged in the filter pipe (362), a plurality of lateral air inlet pipes (370) are connected on the circulating pipeline (321), and the lateral air inlet pipes (370) are connected with the filter pipes (362) in a one-to-one correspondence manner.