CN116576663A - Nitrogen circulation control system for roller kiln and automatic adjustment method - Google Patents
Nitrogen circulation control system for roller kiln and automatic adjustment method Download PDFInfo
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- CN116576663A CN116576663A CN202310380444.1A CN202310380444A CN116576663A CN 116576663 A CN116576663 A CN 116576663A CN 202310380444 A CN202310380444 A CN 202310380444A CN 116576663 A CN116576663 A CN 116576663A
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- nitrogen
- air
- control system
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- oxygen content
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 196
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 69
- 238000005406 washing Methods 0.000 claims abstract description 52
- 238000001816 cooling Methods 0.000 claims abstract description 43
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000001301 oxygen Substances 0.000 claims abstract description 41
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 4
- 238000004064 recycling Methods 0.000 claims description 3
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 229920000742 Cotton Polymers 0.000 claims description 2
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 239000010406 cathode material Substances 0.000 description 4
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000010405 anode material Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000112 cooling gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/04—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity adapted for treating the charge in vacuum or special atmosphere
- F27B9/045—Furnaces with controlled atmosphere
- F27B9/047—Furnaces with controlled atmosphere the atmosphere consisting of protective gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
Abstract
The application discloses a nitrogen circulation control system for a roller kiln and an automatic regulation method, comprising a gas supply section, a cooling section, a nitrogen buffer tank, a gas washing chamber, a heating section, a fan, a thermocouple group, an oxygen content analyzer group and a control system; the air supply section comprises an air inlet nozzle facing the left cooling section and an air inlet nozzle vertical to the left side and the right side; the cooling section is positioned at the rear end of the air supply section, a thermocouple and an oxygen content analyzer are arranged in the tail end, a fan is arranged on the outer side of the tail part, and the fan is connected with the inner space through a pipeline; the nitrogen buffer tank is characterized in that the front end of the nitrogen buffer tank is connected with the fan through a pipeline, and the rear end of the nitrogen buffer tank is connected with a plurality of pipelines to be respectively communicated with the air supply section, the air washing chamber and the tail gas emission.
Description
Technical Field
The application relates to a nitrogen circulation control system, in particular to a nitrogen circulation control system for a roller kiln and an automatic adjustment method.
Background
The roller kiln is one of important equipment for producing lithium ion battery cathode materials. The cathode material is required to pass through the heating chamber, the heat preservation chamber and the cooling chamber in turn before and after heat treatment or thermochemical treatment, and the kiln chambers are communicated with each other.
In the process of heat treatment or thermochemical treatment of the lithium ion battery cathode material in a kiln, the oxygen component in the internal space of the lithium ion battery cathode material is ensured to be at an extremely low level, and the product is prevented from being oxidized at a high temperature to cause failure. Therefore, during the production process of the lithium ion battery anode material, a sufficient amount of protective gas (such as nitrogen, argon, etc.) is generally required to be introduced into the kiln. As a large continuous heat treatment device, the roller kiln has complex and diverse internal atmosphere, which requires a good planning of gas flow in the furnace, and meanwhile, as the amount of protective gas to be introduced is huge, one of the main costs in the production process is generated, so how to control the gas consumption is a problem to be solved. In view of the above technical problems, development of a nitrogen circulation control system for a roller kiln is urgently needed.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present application is how to overcome the problem of unstable air flow distribution in the roller kiln, and how to effectively utilize heat energy in the kiln, so that an appropriate inert gas environment can be provided for the kiln at the same time, and the amount of nitrogen can be controlled to meet the requirements of high production efficiency and low cost;
on the one hand, the application aims to provide a nitrogen circulation control system for a roller kiln, which comprises a gas supply section, a cooling section, a nitrogen buffer tank, a gas washing chamber, a heating section, a fan, a thermocouple group, an oxygen content analyzer group and a control system;
the air supply section comprises an air inlet nozzle facing the left cooling section and an air inlet nozzle vertical to the left side and the right side;
the cooling section is positioned at the rear end of the air supply section, a thermocouple and an oxygen content analyzer are arranged in the tail end, a fan is arranged on the outer side of the tail part, and the fan is connected with the inner space through a pipeline;
the front end of the nitrogen buffer tank is connected with the fan through a pipeline, and the rear end of the nitrogen buffer tank is connected with a plurality of pipelines to be respectively communicated with the air supply section, the air washing chamber and the tail gas emission;
the gas washing chamber is positioned at the front end of the heating section, the front end of the gas washing chamber is provided with a feeding inlet, the gas washing chamber is communicated with the nitrogen buffer tank through a pipeline, and an oxygen content tester is arranged in the chamber;
the front end of the heating section is connected with the gas washing chamber, the rear end of the heating section is connected with the gas supply section, the front end of the heating section is connected to the tail gas emission system through a pipeline, a plurality of groups of thermocouples and an oxygen content analyzer are arranged at the tail end of the heating section, and the test results of the thermocouples and the oxygen content analyzer are synchronized to the control system in real time;
the thermocouple group is distributed in each working section in the furnace, is used for testing the temperature in the furnace in real time and feeding back the temperature to the control system, and the oxygen content analyzer group is distributed in each working section in the furnace, is used for testing the oxygen content in the furnace in real time and feeding back the oxygen content to the control system;
and the control system gathers signals fed back by each table group, compares the signals with a preset program, sends out instructions to each system according to the program, and adjusts the atmosphere in the furnace.
Optionally, the air supply section, the cooling section, the nitrogen buffer tank, the gas washing chamber, the heating section and the fan are connected through a gas conveying pipeline.
Optionally, the connection parts of the gas conveying pipeline and each working section are wrapped with heat insulation layers surrounding the pipeline, and the heat insulation layers are formed by aluminum silicate heat insulation cotton felt.
Optionally, the air outlet direction of the air inlet nozzle facing the left cooling section is 45 degrees and faces the cooling section, and the air inlet nozzle perpendicular to the left side and the right side is perpendicular to the furnace body.
Optionally, one group of air sources in the air inlet nozzle facing the left cooling section is from the front end nitrogen making equipment, and the other group of air sources is from the nitrogen buffer tank.
Optionally, the air sources in the air inlet nozzles perpendicular to the left side and the right side come from a nitrogen buffer tank.
Optionally, each group of air inlet nozzles of the air supply section consists of 6-10 air pipe groups, the air inlet nozzles are evenly distributed on the left side and the right side of the furnace, and the air pipe groups are all provided with independent electromagnetic valves.
Optionally, the maximum power of the fan is 7.5-22KW, and the working power of the fan can be regulated and controlled independently according to a set program.
On the other hand, the application provides an automatic adjustment method of a nitrogen circulation control system for a roller kiln, which comprises the following steps:
s1, the control system receives temperature and oxygen content signals from each table group, compares the temperature and oxygen content signals with values preset by the system at the moment, and enters a corresponding debugging stage when different results are found.
S2, a cooling atmosphere regulating system, when the atmosphere in the furnace is changed, the oxygen content O of the cooling section Cold water Exceeding standard, the system sends out alarm signal at this time, and adjusts the valve 211 at the nitrogen transmission pipeline 21 to make its flow rate P 1 Total amount of nitrogen P required to be raised to the current furnace Total (S) The method comprises the steps of carrying out a first treatment on the surface of the Emergency closing the buffer tank outlet pipeline 124, opening the buffer tank tail gas pipeline 122, and replacing circulating nitrogen in the furnace; up to O Cold water After the normal state is recovered, each valve is called back again, and the total air flow debugging stage S4 is entered;
s3, a flow regulating system of a gas washing chamber, wherein the gas washing chamber generates oxygen content O in a gas washing stage Washing Exceeding standard, the system sends out alarm signal at this moment, and the control system controls and improves nitrogen flow P in the gas washing pipeline 123 Washing Up to O Washing Reaching the standard, and then P Washing The flow rate is taken as a new preset value, and the system enters a total air flow amount adjustment stage S4.
S4, in the air flow total amount debugging stage, nitrogen entering the nitrogen buffer tank from the cooling stage meets the recycling condition, namely oxygen content reaches the standard, the nitrogen can be re-introduced into the furnace, part of the nitrogen is reserved in the buffer tank, and the nitrogen is introduced into the gas washing chamber during each gas washing; part of the air flows as balanced air flows enter the vertical air nozzle 33 of the air inlet section, and the rest air flows enter the air nozzle 32 to become one of new nitrogen sources; the nitrogen amount in the furnace needs to be supplemented:
P 1 =P washing +P 2
At the moment, the control system compares the thermocouple T of the cooling section Cold water And a preset tapping temperature T Out of If T Cold water >T Out of The flow rate of the air tap 211 is increased, otherwise, the flow rate is reversed until T Cold water =T Out of The respective flow parameters T, P at this time are common parameters in normal operation.
In summary, due to the adoption of the technical scheme, the beneficial effects of the application are as follows:
according to the nitrogen circulation control system and the automatic adjustment method for the roller kiln, provided by the application, the control system is used for comparing the parameters, and the flow valves in the system are adjusted by using a preset program, so that the inert atmosphere in the furnace can be well regulated and controlled, the scenario nitrogen in the circulation can be reasonably recycled, and the preheating of the scenario nitrogen is also utilized to a certain extent. The utilization rate of energy is successfully improved, the production cost is reduced, and the use requirement in the furnace is ensured.
Drawings
For a clearer description of the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related 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 gas circulation control system for a roller kiln in accordance with the present application;
FIG. 2 is a graph showing the piping distribution of the intake section of the present application;
FIG. 3 is a schematic view of the air supply section between the heating section and the cooling section of the kiln body according to the application;
fig. 4 is a flow chart of the automatic adjustment of the control system thereof.
Description of the embodiments
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the particular embodiments described herein are illustrative only and are not intended to limit the application, i.e., the embodiments described are merely some, but not all, of the embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It is noted that relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
As shown in fig. 1, 2 and 3, the nitrogen circulation system mainly relates to a cooling section, a nitrogen buffer tank, a gas washing chamber, a heating section, a fan, a thermocouple group, an oxygen content analyzer group and a control system, and is mainly formed by connecting pipelines among all sections.
The air supply section 10 comprises an air inlet nozzle 31, an air inlet nozzle 32 and an air inlet nozzle 33 which are perpendicular to the left side and the right side of the left cooling section. The air inlet air tap 31 of the left cooling section and the air outlet direction of the air inlet air tap 32 face the cooling section at 45 degrees, so that fresh nitrogen is provided for the furnace, and the furnace is provided with two groups of air inlet air taps, wherein the air source of the air tap 31 is from nitrogen making equipment at the front end, and the air source of the air inlet air tap 32 is from a nitrogen buffer tank; the air source of the air inlet nozzle 33 is from a nitrogen buffer tank;
the cooling section 11 is positioned at the rear end of the air inlet section, a thermocouple 111 is arranged in the tail end of the cooling section, an oxygen content analyzer 112 is arranged in the tail end of the cooling section, a fan 22 is arranged at the outer side of the tail part of the cooling section, and the fan is connected with the inner space through a pipeline; the gas in the cooling section 11 is provided by an air inlet air tap 31 and an air inlet air tap 32 of the gas supply section facing the cooling section, and the part of nitrogen and the materials in the furnace perform heat convection so as to achieve the aim of heat dissipation of the product;
the front end of the nitrogen buffer tank 121 is connected with the fan 22 through a pipeline, the rear end of the nitrogen buffer tank is connected with three pipelines 122, 123 and 124 which are respectively communicated with tail gas emission, a gas washing chamber 13 and a gas supply section 10, and the three pipelines are all provided with electric regulating valves, so that the size of the gas supply quantity can be controlled through electric signals;
the gas washing chamber 13 is located at the front end of the heating section 14, the front end of the gas washing chamber is a feeding inlet, the gas washing chamber 13 is communicated with the nitrogen buffer tank 121 through a pipeline 123, a cabin door is closed for gas washing operation after each row of materials enter, internal air is pumped out, nitrogen in the buffer tank is utilized for supplementing so as to achieve the effect of replacing inert atmosphere, and meanwhile, the materials can be preheated once due to the fact that the nitrogen in the buffer tank has a certain temperature, and the heat and nitrogen are recycled; an oxygen content tester 131 is arranged in the cabin, the test result is tested on line and transmitted, and the next step is carried out after the content reaches the standard.
The heating section 14, the front end with the gas washing chamber 13 links to each other, the rear end is connected the air supply section 10, the front end is connected to exhaust emission system through fan 141, the end sets up multiunit thermocouple 142 and oxygen content analyzer 143, the test result of each instrument is real-time synchronous to control system.
And the control system collects signals fed back by each table group, compares the signals with a preset program, sends out instructions to each system according to the program, and adjusts the atmosphere in the furnace.
Nitrogen initially enters an air inlet tap 31 of an air inlet section of a kiln from nitrogen making equipment through a nitrogen transmission pipeline 21, enters a cooling section to exchange heat with products leftwards through the air inlet tap 31, is pumped into a nitrogen buffer tank 121 through a fan 22, and then nitrogen with substandard oxygen content exits circulation through a tail gas pipe 122, a fixed amount of clean nitrogen intermittently enters a gas washing chamber 13 through a gas washing pipeline 123, and another fixed amount of clean nitrogen enters the air supply section 10 through an air inlet tap 33 of a circulating pipeline 124 to serve as balance air flow for separating gas of the heating section from gas of the cooling section; all the remaining clean nitrogen passes through the inlet tap 32 of the circulation line 124 as a new round of cooling gas; at this time, new nitrogen gas enters the intake nipple 31 from the nitrogen gas delivery pipe 21, and the amount of nitrogen gas consumed by the pipe 123 and the intake nipple 33 is replenished.
And each thermocouple group and oxygen content analyzer group in the system monitor the temperature and oxygen content parameters in the furnace in real time and feed the parameters back to the control center in real time, when the parameters are inconsistent with preset parameters, the control system enters a debugging stage, and each electromagnetic valve in the system is automatically adjusted through a preset program to change the flowing state of nitrogen so as to enable the parameters in the furnace to return to normal level.
Referring to fig. 4, the present application provides an automatic adjustment method of the control system after entering a debugging stage, specifically as follows:
s1, the control system receives temperature and oxygen content signals from each table group, compares the temperature and oxygen content signals with values preset by the system at the moment, and enters a corresponding debugging stage when different results are found.
Cooling atmosphere regulating system S2, when the furnace atmosphere changes, the oxygen content O of the cooling section Cold water Exceeding standard, the system sends out alarm signal at this time, and adjusts the valve 211 at the nitrogen transmission pipeline 21 to raise the flow P1 to the nitrogen required in the current furnaceTotal amount of gas P Total (S) The method comprises the steps of carrying out a first treatment on the surface of the Emergency closing the buffer tank outlet pipeline 124, opening the buffer tank tail gas pipeline 122, and replacing circulating nitrogen in the furnace; up to O Cold water After the normal state is recovered, each valve is called back again, and the total air flow debugging stage S4 is entered;
gas washing chamber flow regulating system S3, and oxygen content O of gas washing chamber in gas washing stage Washing Exceeding standard, the system sends out alarm signal at this moment, and the control system controls and improves nitrogen flow P in the gas washing pipeline 123 Washing Up to O Washing Reaching the standard, and then P Washing The flow rate is taken as a new preset value, and the system enters a total air flow amount adjustment stage S4.
And in the air flow total amount debugging stage S4, the nitrogen entering the nitrogen buffer tank from the cooling section meets the recycling condition, namely the oxygen content reaches the standard, and the nitrogen can be re-introduced into the furnace. Part of nitrogen is reserved in the buffer tank and is introduced into the gas washing chamber during each gas washing; part of the air flows as balanced air flows enter an air inlet nozzle 33 vertically arranged in the air inlet section, and the rest of the air flows enter the air inlet nozzle 32 to become one of new nitrogen sources; the nitrogen amount in the furnace needs to be supplemented:
P 1 =P washing +P 2
At the moment, the control system compares the thermocouple T of the cooling section Cold water And a preset tapping temperature T Out of If T Cold water >T Out of The flow rate of the air tap 211 is increased, otherwise, the flow rate is reversed until T Cold water =T Out of The respective flow parameters T, P at this time are common parameters in normal operation.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (9)
1. A nitrogen circulation control system for a roller kiln comprises a gas supply section, a cooling section, a nitrogen buffer tank, a gas washing chamber, a temperature rising section, a fan, a thermocouple group, an oxygen content analyzer group and a control system; it is characterized in that the method comprises the steps of,
the air supply section comprises an air inlet nozzle facing the left cooling section and an air inlet nozzle vertical to the left side and the right side;
the cooling section is positioned at the rear end of the air supply section, a thermocouple and an oxygen content analyzer are arranged in the tail end, a fan is arranged on the outer side of the tail part, and the fan is connected with the inner space through a pipeline;
the front end of the nitrogen buffer tank is connected with the fan through a pipeline, and the rear end of the nitrogen buffer tank is connected with a plurality of pipelines to be respectively communicated with the air supply section, the air washing chamber and the tail gas emission;
the gas washing chamber is positioned at the front end of the heating section, the front end of the gas washing chamber is provided with a feeding inlet, the gas washing chamber is communicated with the nitrogen buffer tank through a pipeline, and an oxygen content tester is arranged in the chamber;
the front end of the heating section is connected with the gas washing chamber, the rear end of the heating section is connected with the gas supply section, the front end of the heating section is connected to the tail gas emission system through a pipeline, a plurality of groups of thermocouples and an oxygen content analyzer are arranged at the tail end of the heating section, and the test results of the thermocouples and the oxygen content analyzer are synchronized to the control system in real time;
the thermocouple group is distributed in each working section in the furnace, is used for testing the temperature in the furnace in real time and feeding back the temperature to the control system, and the oxygen content analyzer group is distributed in each working section in the furnace, is used for testing the oxygen content in the furnace in real time and feeding back the oxygen content to the control system;
and the control system gathers signals fed back by each table group, compares the signals with a preset program, sends out instructions to each system according to the program, and adjusts the atmosphere in the furnace.
2. The nitrogen circulation control system for the roller kiln according to claim 1, wherein the air supply section, the cooling section, the nitrogen buffer tank, the gas washing chamber, the heating section and the fan are connected through a gas conveying pipeline.
3. The nitrogen circulation control system for the roller kiln according to claim 2, wherein the connection parts of the gas conveying pipelines and each working section are wrapped with heat preservation layers surrounding the pipelines, and the heat preservation layers are formed by aluminum silicate heat preservation cotton felt.
4. The nitrogen circulation control system for a roller kiln according to claim 1, wherein the air outlet direction of the air inlet nozzle facing the left cooling section is 45 degrees, the air inlet nozzle perpendicular to the left side and the right side faces the cooling section, and the air inlet nozzle perpendicular to the furnace body.
5. The nitrogen circulation control system for roller kiln according to claim 4, wherein the air supply in the air inlet nozzle facing the left cooling section is one group of air sources from the front end nitrogen making equipment and the other group of air sources from the nitrogen buffer tank.
6. The nitrogen circulation control system for a roller kiln according to claim 1, wherein the air sources in the air intake nozzles perpendicular to the left and right sides are from a nitrogen buffer tank.
7. The nitrogen circulation control system for a roller kiln according to claim 1, wherein each group of air inlet nozzles of the air supply section consists of 6-10 air pipe groups, the air inlet nozzles are evenly distributed on the left side and the right side of the furnace, and the air pipe groups are provided with independent electromagnetic valves.
8. The nitrogen circulation control system for the roller kiln according to claim 2, wherein the maximum power of the fan is 7.5-22KW, and the working power of the fan can be regulated and controlled independently according to a set program.
9. The automatic adjustment method of a nitrogen circulation control system for a roller kiln according to any one of claims 1 to 9, comprising:
s1, the control system receives temperature and oxygen content signals from each table group, compares the temperature and oxygen content signals with values preset by the system at the moment, and enters a corresponding debugging stage when different results are found;
s2, a cooling atmosphere regulating system, when the atmosphere in the furnace is changed, the oxygen content O of the cooling section Cold water Exceeding standard, the system sends out alarm signal at this time, and adjusts the valve 211 at the nitrogen transmission pipeline 21 to make its flow rate P 1 Total amount of nitrogen P required to be raised to the current furnace Total (S) The method comprises the steps of carrying out a first treatment on the surface of the Emergency shutdownAn outlet pipe 124 in the buffer tank, an exhaust pipe 122 in the buffer tank is opened to replace the circulating nitrogen in the furnace; up to O Cold water After the normal state is recovered, each valve is called back again, and the total air flow debugging stage S4 is entered;
s3, a flow regulating system of a gas washing chamber, wherein the gas washing chamber generates oxygen content O in a gas washing stage Washing Exceeding standard, the system sends out alarm signal at this moment, and the control system controls and improves nitrogen flow P in the gas washing pipeline 123 Washing Up to O Washing Reaching the standard, and then P Washing The flow is used as a new preset value, and the system enters an air flow total amount debugging stage S4;
s4, in the air flow total amount debugging stage, nitrogen entering the nitrogen buffer tank from the cooling stage meets the recycling condition, namely oxygen content reaches the standard, the nitrogen can be re-introduced into the furnace, part of the nitrogen is reserved in the buffer tank, and the nitrogen is introduced into the gas washing chamber during each gas washing; part of the air flows as balanced air flows enter the vertical air nozzle 33 of the air inlet section, and the rest air flows enter the air nozzle 32 to become one of new nitrogen sources; the nitrogen amount in the furnace needs to be supplemented:
P 1 =P washing +P 2
At this time, the control system compares the thermocouple tcld of the cooling section with the preset tapping temperature tsout, if tcld > tsout, the flow of the air tap 211 is increased, otherwise, until tcld=tsout, and then each flow parameter T, P at this time is used as a common parameter in normal operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310380444.1A CN116576663A (en) | 2023-04-11 | 2023-04-11 | Nitrogen circulation control system for roller kiln and automatic adjustment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310380444.1A CN116576663A (en) | 2023-04-11 | 2023-04-11 | Nitrogen circulation control system for roller kiln and automatic adjustment method |
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| Publication Number | Publication Date |
|---|---|
| CN116576663A true CN116576663A (en) | 2023-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310380444.1A Pending CN116576663A (en) | 2023-04-11 | 2023-04-11 | Nitrogen circulation control system for roller kiln and automatic adjustment method |
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| Country | Link |
|---|---|
| CN (1) | CN116576663A (en) |
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- 2023-04-11 CN CN202310380444.1A patent/CN116576663A/en active Pending
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