CN115790144A - Device system and method for recycling nitrogen of roller kiln - Google Patents
Device system and method for recycling nitrogen of roller kiln Download PDFInfo
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Abstract
The invention provides a device system and a method for recycling nitrogen of a roller kiln, wherein the device system comprises: the first gas outlet is arranged in a constant temperature area of the kiln body; the first air supply device, the cooling device, the dust removal device and the oxygen concentration detection device are connected with the first gas outlet in sequence through a nitrogen pipeline; the oxygen concentration detection device is connected with a nitrogen inlet of the kiln body through a nitrogen pipeline. According to the method, a first air supply device is used for pumping out gas to be recovered from a first gas outlet, the gas to be recovered is sequentially cooled by a cooling device and dedusted by a dedusting device to obtain recovered nitrogen, and the recovered nitrogen is circularly fed into a constant temperature area and a cooling area of a kiln body after the oxygen concentration is detected to reach a standard range. The invention can recycle the nitrogen in the roller kiln, and solves the technical problems of resource waste, environmental pollution and the like caused by a large amount of nitrogen waste, oxynitride generated by combustion in the prior art.
Description
Technical Field
The invention relates to the technical field of waste gas separation, recovery and reutilization, in particular to a device system and a method for reutilization of nitrogen in a roller kiln.
Background
At present, the application of the lithium ion battery is continuously expanded, the production and the processing of an important component part of the lithium ion battery, namely, a positive electrode material need to be sintered, and the used sintering equipment of the lithium ion positive electrode material, whether lithium iron phosphate or a ternary positive electrode material, is basically a roller kiln.
The roller kiln comprises a kiln body, an automatic line body and a deodorizing furnace, all gas in the kiln body is pumped into the deodorizing furnace through an air supply device by a traditional roller kiln, natural gas and air are mixed to be combusted and then discharged, for example, CN216592724U discloses a lithium battery anode material carbonization production roller kiln which comprises a roller conveyor and an inlet section, a heating section, a constant temperature section, a cooling section and an outlet section which are sequentially passed by the roller conveyor, a waste gas treatment section is further arranged above the heating section, the waste gas treatment section is communicated with the heating section, the inlet section is provided with an inlet replacement chamber, a sagger is arranged from the inlet replacement chamber, the cooling section is provided with a heat dissipation chamber, a cooling water pipe and a cooling air pipe, the waste gas treatment section is communicated with the heating section through a flue gas pipeline, and flue gas generated by the heating section can enter the waste gas treatment section through the flue gas pipeline.
More than 99% of nitrogen in the kiln is discharged out of the kiln and cannot be reused, and a large amount of natural gas is needed for combustion to generate oxynitride, so that resource waste and environmental pollution are caused.
Therefore, it is necessary to develop a new technology to solve the problems of nitrogen waste and environmental pollution.
CN209221808U discloses a waste gas treatment and waste heat utilization device for a lithium ion battery cathode material production line, which comprises a roller kiln, wherein one end of the roller kiln is connected with a gas inlet, the other end of the roller kiln is connected with an adsorption device through a pipeline, the adsorption device is used for conveying waste gas in the roller kiln to the adsorption device, and the adsorption device is connected with a first exhaust pipe used for exhausting tail gas; the device comprises a heat exchanger, an adsorption device, a nitrogen inlet, a nitrogen outlet, a nitrogen inlet and a nitrogen outlet, wherein one end of the heat exchanger is connected with the adsorption device through a pipeline, high-temperature nitrogen in the adsorption device is conveyed to the heat exchanger through a pipeline, the other end of the heat exchanger is also provided with the nitrogen inlet which is used for conveying new-made nitrogen into the heat exchanger, and the new-made nitrogen and the high-temperature nitrogen exchange heat in the heat exchanger; the heat exchanger is communicated with the gas inlet and is used for conveying the fresh nitrogen gas after being heated to the roller kiln; and the heat exchanger is also connected with a second exhaust pipe for discharging the cooled high-temperature nitrogen.
CN208595823U discloses an intelligent energy-saving roller kiln, an exhaust pipe and an exhaust collecting pipe are installed on an upper furnace body of the roller kiln, a plurality of rows of U-shaped arranged cold gas inlet pipes are arranged in the exhaust collecting pipe, a straight pipe part of each cold gas inlet pipe is connected with the corresponding inlet collecting pipe after coming out of the exhaust collecting pipe, air inlet branch pipes are distributed on the corresponding inlet collecting pipes, a high-temperature-resistant gas flowmeter, a temperature sensor, a pressure sensor and a high-temperature-resistant control valve are installed on the corresponding air inlet branch pipes and are connected with a computer with control software, and the air inlet branch pipes enter the roller kiln again.
However, the device and the process do not relate to the recycling of nitrogen in the fuel gas, only relate to the utilization of waste heat, and still have the problems of nitrogen resource waste and environmental pollution after combustion.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a device system and a method for recycling nitrogen of a roller kiln.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an apparatus system for recycling roller kiln nitrogen, the apparatus system comprising:
the first gas outlet is arranged in a constant temperature area of the kiln body;
the first air supply device, the cooling device, the dust removal device and the oxygen concentration detection device are connected with the first gas outlet in sequence through a nitrogen pipeline;
the oxygen concentration detection device is connected with a nitrogen inlet of the kiln body through a nitrogen pipeline.
According to the invention, the first gas outlet is arranged in the constant temperature area of the kiln body, the gas is extracted, the purity of the extracted gas nitrogen is high, the nitrogen can be recycled after passing through the arranged cooling device and the dust removal device, and the recycling rate of the nitrogen is more than 95%. The device system provided by the invention is simply improved on the basis of the original roller kiln, and the improvement suggestion is feasible.
The invention has no special requirement on the dust removal device, and can adopt the dust removal device known by the technicians in the field, such as a bag-type dust remover, and the technicians in the field can adopt any one of primary dust removal, intermediate dust removal or high-efficiency dust removal according to the production characteristics of the anode material without special limitation.
Preferably, the inner side of the first air supply device is provided with an inner coating.
Preferably, the material of the inner coating is teflon.
Preferably, the material of the nitrogen pipeline comprises a stainless steel pipe.
Preferably, an insulating layer is arranged on the outer side of the nitrogen pipeline.
Preferably, the material of the heat preservation layer comprises aluminum silicate cotton and the like.
Preferably, the cooling device comprises a coil air cooling device or a coil water cooling device. The invention can recover the waste heat in the gas to be recovered through the coil pipe air cooling device or the coil pipe water cooling device.
Preferably, the cooling device and the dust removal device are both closed devices.
Preferably, the device system further comprises a first valve disposed between the oxygen concentration detection device and the nitrogen inlet of the kiln body.
Preferably, the device system further comprises a second valve arranged between the first air supply device and the first gas outlet.
Preferably, the second valve is a throttle valve.
Preferably, the device system further includes a first control system for controlling an open/close state of the first valve and/or the second valve according to the oxygen concentration value detected by the oxygen concentration detection device.
Because the roller kiln is mainly used for producing the anode materials of lithium ion batteries such as lithium iron phosphate anode materials, ternary anodes and the like, and the requirement on the oxygen concentration in the production process of the anode materials is strict, a first valve and a second valve are preferably additionally arranged, and the first valve and the second valve are closed in time when the circulating nitrogen does not reach the standard, so that the production of the anode material product is preferentially ensured.
Preferably, the device system further comprises a nitrogen additional discharge pipeline connected with the oxygen concentration detection device.
The invention is preferably provided with a nitrogen additional discharge pipeline, and when the oxygen concentration is unqualified, the nitrogen can be discharged into the air or can be additionally discharged to other industrial applications.
Preferably, the kiln body comprises an warming area, a constant temperature area and a cooling area from the furnace head to the furnace tail in sequence.
Preferably, the length of the heating zone accounts for 18 to 27% of the length of the kiln body, and may be 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, or the like, for example.
Preferably, the length of the constant temperature zone accounts for 36 to 46% of the length of the kiln body, and may be 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, or the like, for example.
Preferably, the length of the cooling zone accounts for 27 to 36% of the length of the kiln body, and may be, for example, 27%, 28%, 29%, 30%, 31%, 32%, 34%, 35%, 36%, or the like.
Preferably, the first gas outlet is arranged at one end of the constant temperature area close to the heating area.
Preferably, the distance between the first gas outlet and the temperature rising region accounts for 7.7 to 23% of the constant temperature region, and may be, for example, 7.7%, 8%, 9%, 10%, 12%, 15%, 18%, 20%, 22%, 23%, or the like.
The extraction position of the first gas outlet is very critical, because the kiln body of the roller kiln does not only contain nitrogen, but also produces micromolecular organic matters in the calcining process of the anode material in the heating area, the gas in the heating area cannot be simply cooled and filtered and then recovered, the purity of the nitrogen in the constant temperature area and the cooling area is still higher after the nitrogen is used as protective gas, a gas communicated channel is arranged in the kiln body, and the high-purity nitrogen is required to protect the anode material in the subsequent constant temperature area and the cooling area; in order to overcome the defects, the distance between the first gas outlet and the temperature rising area is preferably controlled to be 7.7-23% of the constant temperature area, so that on one hand, the gas in the temperature rising area can be prevented from entering the constant temperature area and the temperature reduction area to influence the production of the anode material product, on the other hand, the utilization rate of nitrogen and the quality of recovered nitrogen can be improved, the cost of nitrogen recovery treatment is reduced, and the aim of efficiently recovering nitrogen is fulfilled.
Preferably, the first gas outlet is provided with at least 1, for example 1, 2 or 3, etc., preferably at least 2. The invention further preferably arranges at least two first gas outlets to better balance the furnace pressure in the roller kiln, so that the recovery rate of nitrogen is higher and the whole production is safer.
Preferably, the device system further comprises a first pressure detector arranged at the first gas outlet and a second pressure detector arranged at the second gas outlet.
Preferably, the apparatus system further comprises a third pressure detector disposed within the kiln body.
The third pressure detector can monitor the pressure in the kiln body in real time, so that the pressure condition of the production of the anode material is guaranteed.
Preferably, the heating area of the kiln body is provided with a second gas outlet.
Preferably, the second gas outlet is connected to a deodorisation unit.
Preferably, a second air supply device is further provided between the second gas outlet and the deodorization device.
Preferably, the device system further comprises a second control system for regulating and controlling any one or at least two of the power of the first air supply device, the power of the second air supply device or the opening degree of the second valve according to the pressure values detected by the first pressure detector and the second pressure detector.
According to the invention, the pressure detection device is preferably arranged in the kiln body, so that the pressure in the kiln body can be monitored in real time, the power of the first air supply device and the power of the second air supply device can be controlled more favorably, the air is prevented from entering the kiln body, and the production of the anode material is better ensured.
Preferably, at least one nitrogen inlet is arranged at the bottom of the constant temperature area and the cooling area of the kiln body.
Preferably, the cooling area, the constant temperature area and the cooling area are each independently provided with at least two temperature areas.
In a second aspect, the invention provides a method for recycling nitrogen in a roller kiln, which is performed by using the device system for recycling nitrogen in a roller kiln of the first aspect.
The method for recycling the nitrogen provided by the second aspect of the invention can safely and efficiently recycle and recycle the nitrogen in the constant temperature area and the cooling area, and can recycle the waste heat in the nitrogen, thereby reducing the production cost of the anode material.
Preferably, the method comprises: and nitrogen is introduced into a constant-temperature area and a cooling area of the kiln body. First air supply arrangement takes out from first gas outlet and treats the recovery gas, treat that the recovery gas cools off and dust collector removes dust through cooling device in proper order, obtains the nitrogen gas of retrieving, the nitrogen gas of retrieving circulates after oxygen concentration detection device detects oxygen concentration and reaches standard range and sends into the thermostatic zone and the cooling zone of kiln body.
According to the invention, the gas is extracted from the first gas outlet, the purity of the extracted gas nitrogen is high, the nitrogen can be recycled through the arranged cooling device and the dust removal device, and the recycling rate of the nitrogen is more than 95%.
Preferably, the cooling and dedusting process is performed in a closed environment.
The invention needs to strictly ensure the closed space in cooling and dust removal and prevent the introduction of oxygen.
Preferably, the pressure in the kiln body is kept less than or equal to 150Pa, such as 150Pa, 140Pa, 130Pa, 120Pa, 110Pa, 100Pa, 90Pa, 80Pa, etc.
Preferably, the final temperature of the cooling is 200 ℃ or less, and may be, for example, 200 ℃, 190 ℃, 180 ℃, 170 ℃, 160 ℃, 150 ℃, or 120 ℃.
The invention needs to reduce the temperature of the gas to be recovered to below 200 ℃, otherwise the cost of the subsequent dust removal device is greatly increased.
Preferably, the standard range is 50ppm or less, and may be, for example, 50ppm, 40ppm, 30ppm, 20ppm, 10ppm or the like.
Preferably, when the oxygen concentration of the recovered nitrogen detected by the oxygen concentration detection device does not reach the standard range, the first control system closes the first valve and the second valve, and discharges the nitrogen in the nitrogen pipeline through another nitrogen discharge pipeline.
Preferably, the first control system closes the first valve before closing the second valve.
Preferably, the second air supply device extracts the gas to be deodorized from the second gas outlet and sends the gas to the deodorization device for deodorization treatment.
Preferably, the wind pressure of the first gas outlet is less than the wind pressure of the second gas outlet.
Preferably, the wind pressure of the first gas outlet is 1 to 100Pa smaller than that of the second gas outlet, and may be, for example, 1Pa, 5Pa, 10Pa, 15Pa, 20Pa, 25Pa, 30Pa, 35Pa, 40Pa, 50Pa, 60Pa, 70Pa, 80Pa, 90Pa, 100Pa, or the like.
The difficulty of the invention lies in how to ensure that the second gas outlet can extract all gas in the heating area, thereby avoiding the condition that the product line cannot continue to produce because the air in the heating area is introduced into the constant temperature area and the cooling area, ensuring that the pressure in the kiln body is ensured, and ensuring that the wind pressure of the second gas outlet is slightly larger than that of the first gas outlet, so as to achieve the technical index. The invention preferably controls the wind pressure of the first gas outlet to be smaller than the wind pressure of the second gas outlet by 1 to 100Pa, preferably by 5 to 70Pa, and can simultaneously guarantee the recovery utilization rate of nitrogen.
Preferably, the second control system monitors that the difference between the wind pressure of the first gas outlet and the wind pressure of the second gas outlet is not within a set range, and adjusts any one or a combination of at least two of the power of the second air supply device, the power of the first air supply device or the opening of the second valve.
The invention is additionally provided with the second control system which can adjust the power of the first air supply device, the power of the second air supply device and the opening of the second valve in real time, thereby ensuring the safe operation of the whole device.
As a preferable technical solution of the present invention, the method includes:
and nitrogen is introduced into a constant-temperature area and a cooling area of the kiln body. The first air supply device pumps gas to be recovered from a first gas outlet, the gas to be recovered is sequentially cooled to a temperature of less than or equal to 200 ℃ by a cooling device and dedusted by a dedusting device to obtain recovered nitrogen, the recovered nitrogen is circularly sent to a constant temperature area and a cooling area of the kiln body after the oxygen concentration of the recovered nitrogen is detected to be less than or equal to 50ppm by an oxygen concentration detection device, and when the oxygen concentration of the recovered nitrogen is detected to be less than or equal to a standard range of less than or equal to 50ppm by the oxygen concentration detection device, a first control system firstly closes a first valve and then closes a second valve, and nitrogen in a nitrogen pipeline is discharged by a nitrogen additional discharge pipeline;
the second air supply device pumps the odor body to be deodorized from the second gas outlet and sends the odor body to the deodorization device for deodorization treatment; the wind pressure of the first gas outlet is smaller than that of the second gas outlet; the wind pressure of the first gas outlet is 5 to 15Pa smaller than that of the second gas outlet; and when the second control system monitors that the difference between the wind pressure of the first gas outlet and the wind pressure of the second gas outlet is not in a set range, the second control system adjusts any one or the combination of at least two of the power of the second air supply device, the power of the first air supply device or the opening of the second valve.
The present invention is not particularly limited to the production process of the positive electrode material and the deodorizing treatment in the above-described process, and any means and apparatus that can be used for the production and deodorizing treatment of the positive electrode material and are well known to those skilled in the art may be used.
Compared with the prior art, the invention has at least the following beneficial effects:
(1) The device system for recycling the nitrogen of the roller kiln can be better improved on the basis of the original roller kiln, the reconstruction cost is low, only 20 to 100 ten thousand yuan is needed by additionally arranging a set of device system for recycling the nitrogen, the reconstruction period is short, and only 30 to 60 days are needed; about 6 months is needed for manufacturing a new roller kiln;
(2) The device system for recycling the nitrogen of the roller kiln can realize stable and safe operation of the device system by optimally arranging the first control system and the second control system;
(3) The method for recycling the nitrogen of the roller kiln can recycle more than 99 percent of the nitrogen, can save about 310 ten thousand cubic meters of nitrogen for 4500 tons of anode materials produced annually, and simultaneously saves the cost of natural gas required by nitrogen combustion, and the total cost is saved by more than 615 ten thousand yuan.
Drawings
Fig. 1 is a system diagram of a device for recycling nitrogen in a roller kiln provided in embodiment 1 of the present invention.
Fig. 2 is a diagram of a roller bed kiln provided in comparative example 1 of the present invention.
In the figure: 1-a first gas outlet; 2-a first air supply device; 3-a cooling device; 4-a dust removal device; 5-an oxygen concentration detection device; 6-a kiln body; 61-temperature rising zone; 62-constant temperature area; 63-cooling area; 7-a second gas outlet; 8-a second air supply device; 9-deodorization device.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The present invention is described in further detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
It should be understood by those skilled in the art that the present invention necessarily includes necessary piping, conventional valves and general pump equipment for achieving the complete process, but the above contents do not belong to the main inventive points of the present invention, and those skilled in the art can select the layout of the additional equipment based on the process flow and the equipment structure, and the present invention is not particularly limited to this.
Example 1
The embodiment provides a device system for recycling roller kiln nitrogen, as shown in fig. 1, the device system includes:
a first gas outlet 1 arranged in a constant temperature area 62 of the kiln body 6; the first air supply device 2, the cooling device 3, the dust removal device 4 and the oxygen concentration detection device 5 are connected with the first gas outlet 1 in sequence through a nitrogen pipeline; the oxygen concentration detection device 5 is connected with a nitrogen inlet of the kiln body 6 through a nitrogen pipeline.
The length of the kiln body 6 is 60m, and the kiln body 6 sequentially comprises a temperature rising area 61, a constant temperature area 62 and a temperature reducing area 63 from the furnace head to the furnace tail; the length of the heating area 61 accounts for 20% of the length of the kiln body 6; the length of the constant temperature area 62 accounts for 44% of the length of the kiln body 6; the length of the cooling zone 63 accounts for 36% of the length of the kiln body 6; the first gas outlet 1 is arranged at one end of the constant temperature area 62 close to the heating area 61; the first gas outlet 1 is provided with two (not shown); the distance between the two first gas outlets 1 and the heating zone 61 is 10% and 15% of the constant temperature zone 62.
An inner coating is arranged on the inner side of the first air supply device 2; the inner coating is made of Teflon; the nitrogen pipeline is made of a stainless steel pipe; an insulating layer is arranged on the outer side of the nitrogen pipeline; the heat preservation layer is made of aluminum silicate cotton.
The cooling device 3 comprises a coil pipe air cooling device or a coil pipe water cooling device; the device system also comprises a first valve arranged between the oxygen concentration detection device 5 and a nitrogen inlet of the kiln body 6; the device system also comprises a second valve arranged between the first air supply device 2 and the first gas outlet 1; the device system also comprises a first control system for controlling the opening and closing states of the first valve and/or the second valve according to the oxygen concentration value detected by the oxygen concentration detection device 5.
The device system also comprises a nitrogen additional discharge pipeline connected with the oxygen concentration detection device 5.
The device system further comprises a first pressure detector arranged at the first gas outlet 1 and a second pressure detector arranged at the second gas outlet 7; the heating area 61 of the kiln body 6 is provided with a second gas outlet 7; the second gas outlet 7 is connected with a deodorization device 9; a second air supply device 8 is arranged between the second gas outlet 7 and the deodorization device 9; the device system also comprises a second control system for controlling the power of the first air supply device 2 and/or the second air supply device 8 according to the pressure values detected by the first pressure detector and the second pressure detector; 37 nitrogen inlets (corresponding to 37 different temperature zones) are arranged at the bottoms of the constant temperature zone 62 and the cooling temperature zone 63 of the kiln body 6; the heating area 61 is provided with 15 temperature areas.
Example 2
The embodiment provides a device system for roller kiln nitrogen gas reuse, the device system includes:
the first gas outlet is arranged in a constant temperature area of the kiln body; the first air supply device, the cooling device, the dust removal device and the oxygen concentration detection device are connected with the first gas outlet in sequence through a nitrogen pipeline; the oxygen concentration detection device is connected with a nitrogen inlet of the kiln body through a nitrogen pipeline.
The length of the kiln body is 60m, and the kiln body sequentially comprises a heating area, a constant temperature area and a cooling area from the furnace head to the furnace tail; the length of the heating area accounts for 27% of the length of the kiln body; the length of the constant temperature area accounts for 46% of the length of the kiln body; the length of the cooling area accounts for 27% of the length of the kiln body; the first gas outlet is arranged at one end of the constant temperature area close to the heating area; the first gas outlet is provided with two (not shown); the distance between the two first gas outlets and the heating area accounts for 7.7% and 10% of the constant-temperature area.
An inner coating is arranged on the inner side of the first air supply device; the inner coating is made of Teflon; the nitrogen pipeline is made of a stainless steel pipe; an insulating layer is arranged on the outer side of the nitrogen pipeline; the heat preservation layer is made of aluminum silicate cotton.
The cooling device comprises a coil pipe air cooling device or a coil pipe water cooling device; the device system also comprises a first valve arranged between the oxygen concentration detection device and the nitrogen inlet of the kiln body; the device system also comprises a second valve arranged between the first air supply device and the first gas outlet; the device system also comprises a first control system for controlling the opening and closing states of the first valve and/or the second valve according to the oxygen concentration value detected by the oxygen concentration detection device.
The device system also comprises a nitrogen additional discharge pipeline connected with the oxygen concentration detection device.
The device system further comprises a first pressure detector arranged at the first gas outlet and a second pressure detector arranged at the second gas outlet; the heating area of the kiln body is provided with a second gas outlet; the second gas outlet is connected with a deodorization device; a second air supply device is also arranged between the second gas outlet and the deodorization device; the device system also comprises a second control system for regulating and controlling any one or at least two of the power of the first air supply device and the second air supply device or the opening of the second valve according to the pressure values detected by the first pressure detector and the second pressure detector; 30 nitrogen inlets (corresponding to 30 different temperature zones) are arranged at the bottoms of the constant-temperature zone and the cooling zone of the kiln body; the cooling area is provided with 25 temperature areas.
Example 3
The embodiment provides a device system for roller kiln nitrogen gas reuse, the device system includes:
the first gas outlet is arranged in a constant temperature area of the kiln body; the first air supply device, the cooling device, the dust removal device and the oxygen concentration detection device are connected with the first gas outlet in sequence through a nitrogen pipeline; the oxygen concentration detection device is connected with a nitrogen inlet of the kiln body through a nitrogen pipeline.
The length of the kiln body is 80m, and the kiln body sequentially comprises a heating area, a constant temperature area and a cooling area from the furnace head to the furnace tail; the length of the heating area accounts for 18% of the length of the kiln body; the length of the constant temperature area accounts for 46% of the length of the kiln body; the length of the cooling area accounts for 36% of the length of the kiln body; the first gas outlet is arranged at one end of the constant temperature area close to the heating area; the first gas outlet is provided with two (not shown); the distance between the two first gas outlets and the temperature rising area accounts for 15% and 20% of the constant temperature area.
An inner coating is arranged on the inner side of the first air supply device; the inner coating is made of Teflon; the nitrogen pipeline is made of a stainless steel pipe; an insulating layer is arranged on the outer side of the nitrogen pipeline; the heat preservation layer is made of aluminum silicate cotton.
The cooling device comprises a coil pipe air cooling device or a coil pipe water cooling device; the device system also comprises a first valve arranged between the oxygen concentration detection device and the nitrogen inlet of the kiln body; the device system also comprises a second valve arranged between the first air supply device and the first gas outlet; the device system also comprises a first control system for controlling the opening and closing states of the first valve and/or the second valve according to the oxygen concentration value detected by the oxygen concentration detection device.
The device system also comprises a nitrogen additional discharge pipeline connected with the oxygen concentration detection device.
The device system further comprises a first pressure detector arranged at the first gas outlet and a second pressure detector arranged at the second gas outlet; the heating area of the kiln body is provided with a second gas outlet; the second gas outlet is connected with a deodorization device; a second air supply device is also arranged between the second gas outlet and the deodorization device; the device system also comprises a second control system for regulating and controlling any one or at least two of the power of the first air supply device and the second air supply device or the opening of the second valve according to the pressure values detected by the first pressure detector and the second pressure detector; the bottom of the constant temperature area and the cooling area of the kiln body is provided with 42 nitrogen inlets (corresponding to 42 different temperature areas); the cooling area is provided with 18 temperature areas.
Example 4
The embodiment provides a device system for recycling nitrogen of a roller kiln, and the device system is the same as the device system in embodiment 1 except that the distance between the two first gas outlets and the heating area accounts for 5% and 15% of the constant-temperature area.
Example 5
The embodiment provides a device system for recycling nitrogen of a roller kiln, which is the same as that in embodiment 1 except that only one first gas outlet is arranged, and the distance between the first gas outlet and the heating area accounts for 25% of that of the constant-temperature area.
Example 6
The embodiment provides a device system for recycling nitrogen of a roller kiln, and the device system is the same as that in embodiment 1 except that only one first gas outlet is arranged, namely the distance between the first gas outlet and the heating area accounts for 10% of the constant temperature area.
Application example 1
The application example provides a method for recycling nitrogen of a roller kiln, which is performed by adopting the device system for recycling nitrogen of the roller kiln provided by the embodiment 1, and comprises the following steps:
introducing nitrogen into a constant-temperature area and a cooling area of the kiln body; the first air supply device pumps gas to be recovered from a first gas outlet, the gas to be recovered is sequentially cooled to a temperature of less than or equal to 200 ℃ by a cooling device and dedusted by a dedusting device to obtain recovered nitrogen, the recovered nitrogen is circularly sent to a constant temperature area and a cooling area of the kiln body after the oxygen concentration of the recovered nitrogen is detected to be less than or equal to 50ppm by an oxygen concentration detection device, and when the oxygen concentration of the recovered nitrogen is detected to be less than or equal to a standard range of less than or equal to 50ppm by the oxygen concentration detection device, a first control system firstly closes a first valve and then closes a second valve, and nitrogen in a nitrogen pipeline is discharged by a nitrogen additional discharge pipeline;
the second air supply device pumps the odor body to be deodorized from the second gas outlet and sends the odor body to the deodorization device for deodorization treatment; the wind pressure of the first gas outlet is smaller than that of the second gas outlet; the wind pressure of the first gas outlet is 8Pa less than that of the second gas outlet; and when the second control system monitors that the difference between the wind pressure of the first gas outlet and the wind pressure of the second gas outlet is not in a set range, the second control system adjusts any one or the combination of at least two of the power of the second air supply device, the power of the first air supply device or the opening of the second valve.
The device system in application example 1 can operate stably and safely, the purity of the nitrogen extracted from the first gas outlet is high, the oxygen content can reach the standard of less than or equal to 50ppm after cooling and dust removal, the recovery utilization rate of the nitrogen in a constant temperature area and a cooling area is up to 90 percent, and the device for producing 4500 tons of anode materials annually is suitable for equipment producing 4500 tons of anode materials annuallySaving nitrogen gas up to 310 ten thousand m 3 The annual cost is saved by up to 651 ten thousand yuan, the economic benefit is obvious, and the emission of nitrogen entering the deodorization furnace is reduced.
Application example 2~6
Application examples 2~6 respectively provide a method for recycling roller kiln nitrogen, and the method is the same as application example 1 except that the roller kiln nitrogen recycling device system provided in example 2~6 is respectively adopted.
Similar technical effects to those in application example 1 can be obtained in application example 2 and application example 3, and as shown in table 1, it can be seen from the comprehensive application example 1~3 that costs of 615 ten thousand yuan or more can be saved for equipment producing 4500 tons of cathode materials annually.
It can be seen from comparison between application example 4~5 and application example 1 that the arrangement position of the first gas outlet is very critical, and in application example 4, the first gas outlet is arranged at a position 5% away from the temperature rise region, so that in the operation process, the operation parameter control is difficult, the gas in the temperature reduction region is easily pumped into the first gas outlet, and finally, the operation cost of nitrogen recovery is increased, and for equipment producing 4500 tons of anode materials every year, the annual cost is saved by only 525 ten thousand yuan. In application example 5, the first gas outlet is arranged at the middle of the constant temperature region, so that the loss of nitrogen gas at the front section of the constant temperature region is serious, the utilization rate of nitrogen gas is only 73%, and the nitrogen gas saving amount per year is only 251 ten thousand meters 3 Finally, the annual cost saving is only 527.1 ten thousand yuan, so that the method can better save the cost and improve the nitrogen recovery utilization rate by arranging the position of the first gas outlet at a proper position.
It can be seen from comparison between application example 6 and application example 1 that two first gas outlets are arranged in application example 1, and compared with the case that only one first gas outlet is arranged in application example 6, the annual saving cost in application example 1 is up to 651 ten thousand yuan, while in application example 6, the operation cost of the device system is increased due to the fact that the pressure in the roller kiln and the wind pressure control of the first gas outlet and the second gas outlet are difficult, the situation that the second valve is closed frequently occurs, the overall recovery rate of nitrogen is reduced to 78%, and the annual saving cost is only 564 ten thousand yuan, which shows that the invention preferably sets at least two first gas outlets, and is more favorable for improving the overall recovery rate of nitrogen.
Application example 7
The application example provides a method for recycling nitrogen of a roller kiln, and the method is the same as the application example 1 except that the wind pressure of the first gas outlet is 0.2Pa smaller than that of the second gas outlet.
Application example 8
The application example provides a method for recycling nitrogen of a roller kiln, and the method is the same as the application example 1 except that the wind pressure of the first gas outlet is 120Pa smaller than that of the second gas outlet.
Comparing application example 1 and application example 7~8, it can be seen that in application example 7, the wind pressure of the first gas outlet is only 0.2Pa smaller than that of the second gas outlet, and the situation of pressure deviation easily occurs during the operation process, so that the gas in the heating area is easily pumped into the first gas outlet, the purity of nitrogen recovery is reduced, better cyclic utilization is difficult, and the system is difficult to continuously and safely operate; in application example 8, since the wind pressure of the first gas outlet is too much smaller than that of the second gas outlet, it is difficult to extract enough nitrogen from the first gas outlet, and the recovery rate of nitrogen is only 10%, thereby indicating that the invention preferably controls the wind pressure of the first gas outlet and the wind pressure difference of the second gas outlet during operation, which is more beneficial to smooth operation of the device system and increase of the recovery rate of nitrogen.
Application example 9
The application example provides a method for recycling nitrogen of a roller kiln, and the method is the same as the application example 1 except that when the oxygen concentration of the recovered nitrogen detected by an oxygen concentration detection device is not within a standard range of less than or equal to 50ppm, a first control system closes a second valve first and then closes a first valve.
The first valve is closed firstly when the oxygen concentration exceeds the standard in the application example 1, and compared with the second valve which is closed firstly when the oxygen concentration exceeds the standard in the application example 8, the application example 1 can better protect products produced by the anode material in the roller kiln from being influenced, and the loss is reduced to the maximum extent.
Comparative example 1
The present comparative example provides an apparatus system of a roller kiln, as shown in fig. 2, the apparatus system is the same as that of example 1 except that the first gas outlet 1, the first air supply apparatus 2, the cooling apparatus 3, the dust removal apparatus 4, and the oxygen concentration detection apparatus 5, and their related connections are not provided.
Specifically, the device system comprises a kiln body 6, the length of the kiln body 6 is 60m, and the kiln body 6 sequentially comprises a heating area 61, a constant temperature area 62 and a cooling area 63 from a furnace head to a furnace tail; the length of the heating area 61 accounts for 20% of the length of the kiln body 6; the length of the constant temperature area 62 accounts for 44% of the length of the kiln body 6, and the length of the cooling area 63 accounts for 36% of the length of the kiln body 6.
The device system further comprises a second pressure detector arranged at the second gas outlet 7; the heating area 61 of the kiln body 6 is provided with a second gas outlet 7; the second gas outlet 7 is connected with a deodorization device 9; a second air supply device 8 is arranged between the second gas outlet 7 and the deodorization device 9; 37 nitrogen inlets (corresponding to 37 different temperature zones) are arranged at the bottoms of the constant temperature zone 62 and the cooling temperature zone 63 of the kiln body 6; the heating area 61 is provided with 15 temperature areas.
The first gas outlet, the first air supply device, the cooling device and the dust removal device are not arranged in the comparison example, nitrogen in the constant temperature area and the cooling area cannot be recycled, and the overall cost is high.
The nitrogen flow rate returned by circulation is divided by the total nitrogen flow rate entering a constant temperature area and a cooling area in the kiln body to be recorded as the nitrogen recovery utilization rate, the nitrogen saving amount of 4500 tons of anode materials produced every year is counted, the operation cost of the nitrogen recycling is subtracted from the sum of the nitrogen making energy consumption and the operation management cost of the nitrogen produced by self, the saved nitrogen cost is calculated according to the unit price of 2.1 yuan per cubic meter, and the results of application example 1~3 are shown in table 1.
TABLE 1
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A device system for recycling roller kiln nitrogen, which is characterized by comprising:
the first gas outlet is arranged in a constant temperature area of the kiln body;
the first air supply device, the cooling device, the dust removal device and the oxygen concentration detection device are connected with the first gas outlet in sequence through a nitrogen pipeline;
the oxygen concentration detection device is connected with a nitrogen inlet of the kiln body through a nitrogen pipeline.
2. The apparatus system according to claim 1, further comprising a first valve disposed between the oxygen concentration detection apparatus and the nitrogen inlet of the kiln body;
the device system also comprises a second valve arranged between the first air supply device and the first gas outlet;
the device system also comprises a first control system for controlling the opening and closing states of the first valve and/or the second valve according to the oxygen concentration value detected by the oxygen concentration detection device.
3. The apparatus system according to claim 1 or 2, wherein the first gas outlet is provided at an end of the constant temperature zone near the heating zone;
the distance between the first gas outlet and the heating area accounts for 7.7-23% of the constant-temperature area.
4. The apparatus system according to claim 2, wherein the furnace body is provided with a second gas outlet at the heating zone;
the second gas outlet is connected with a deodorization device;
a second air supply device is also arranged between the second gas outlet and the deodorization device;
the device system further comprises a first pressure detector arranged at the first gas outlet and a second pressure detector arranged at the second gas outlet;
the device system also comprises a second control system for regulating and controlling any one or at least two of the power of the first air supply device, the power of the second air supply device or the opening of the second valve according to the pressure values detected by the first pressure detector and the second pressure detector.
5. A method for recycling nitrogen in a roller kiln, which is characterized by being carried out by using the nitrogen recycling device system of 1~4.
6. The method of claim 5, wherein the method comprises: introducing nitrogen into a constant-temperature area and a cooling area of the kiln body; first air supply arrangement takes out from first gas outlet and treats the recovery gas, treat that the recovery gas cools off and dust collector removes dust through cooling device in proper order, obtains the nitrogen gas of retrieving, the nitrogen gas of retrieving circulates after oxygen concentration detection device detects oxygen concentration and reaches standard range and sends into the thermostatic zone and the cooling zone of kiln body.
7. The method of claim 6, wherein when the recovered nitrogen gas is detected by the oxygen concentration detection device that the oxygen concentration does not reach the standard range, the first control system closes the first valve and the second valve and discharges the nitrogen gas in the nitrogen gas pipeline through the nitrogen gas discharge pipeline.
8. The method of claim 6 or 7, wherein the second control system monitors that the difference between the wind pressure of the first gas outlet and the wind pressure of the second gas outlet is not within a set range, and adjusts any one or a combination of at least two of the power of the second air blowing device, the power of the first air blowing device or the opening degree of the second valve.
9. The method of claim 8, wherein the wind pressure of the first gas outlet is less than the wind pressure of the second gas outlet;
the wind pressure of the first gas outlet is 1 to 100Pa smaller than that of the second gas outlet.
10. The method of claim 6, wherein the method comprises:
introducing nitrogen into a constant-temperature area and a cooling area of the kiln body; the first air supply device pumps gas to be recovered from a first gas outlet, the gas to be recovered is sequentially cooled to a temperature of less than or equal to 200 ℃ by a cooling device and dedusted by a dedusting device to obtain recovered nitrogen, the recovered nitrogen is circularly sent to a constant temperature area and a cooling area of the kiln body after the oxygen concentration of the recovered nitrogen is detected to be less than or equal to 50ppm by an oxygen concentration detection device, and when the oxygen concentration of the recovered nitrogen is detected to be less than or equal to a standard range of less than or equal to 50ppm by the oxygen concentration detection device, a first control system firstly closes a first valve and then closes a second valve, and nitrogen in a nitrogen pipeline is discharged by a nitrogen additional discharge pipeline;
the second air supply device pumps the odor body to be deodorized from the second gas outlet and sends the odor body to the deodorization device for deodorization treatment; the wind pressure of the first gas outlet is smaller than that of the second gas outlet; the wind pressure of the first gas outlet is 5 to 15Pa smaller than that of the second gas outlet; and when the second control system monitors that the difference between the wind pressure of the first gas outlet and the wind pressure of the second gas outlet is not in a set range, the second control system adjusts any one or the combination of at least two of the power of the second air supply device, the power of the first air supply device or the opening of the second valve.
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| CN116294578A (en) * | 2023-05-22 | 2023-06-23 | 天津巴莫科技有限责任公司 | Roller kiln and gas control device thereof |
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