CN112944928A - Low-nitrogen roasting furnace and control method thereof - Google Patents
Low-nitrogen roasting furnace and control method thereof Download PDFInfo
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- CN112944928A CN112944928A CN202110326641.6A CN202110326641A CN112944928A CN 112944928 A CN112944928 A CN 112944928A CN 202110326641 A CN202110326641 A CN 202110326641A CN 112944928 A CN112944928 A CN 112944928A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0003—Monitoring the temperature or a characteristic of the charge and using it as a controlling value
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
A low-nitrogen roasting furnace and a control method thereof comprise a plurality of heating units which are adjacently communicated, wherein each heating unit comprises at least one heating part and at least one temperature measuring part, at least one temperature measuring part is arranged behind each heating part, the heating parts and the adjacent temperature measuring parts positioned at the downstream of the flowing of flue gas form a control base point, and the average temperature of the control base point corresponding to the flowing direction of the flue gas is gradually reduced. This application sets up through heating portion and temperature measurement portion cooperation, controls the power of heating portion through the one-to-one of temperature measurement portion and heating portion to have more accurate control to the temperature, reduce because the improper production of heating power nitrogen oxide that leads to of temperature control.
Description
Technical Field
The application relates to a low-nitrogen roasting furnace and a control method thereof.
Background
The prebaked anode roasting furnace is one of the core devices in the prebaked anode production process, and the normal operation of the roasting furnace is the guarantee of stable yield and quality of prebaked anode production. With the increasingly strict environmental protection requirements of China, on-line monitoring equipment is generally installed on the flue gas of the roasting furnace, and the stable standard emission of the flue gas of the roasting furnace becomes a necessary premise for the stable operation of the roasting furnace.
At present, most of nitrogen oxides before denitration of a prebaked anode roasting furnace can not be discharged stably and reach the standard, and actual measurement values before denitration are generally 80-140mg/m3And with the periodic variation of the roasting curve, SCR or SNCR equipment is required to carry out denitration so as to stably reach the emission standard. The investment of the denitration equipment of one roasting furnace is less, so that the investment is more than one million and more than millions, and an enterprise often has a plurality of roasting furnaces, so that a plurality of denitration equipment are needed to meet the requirements, and larger equipment investment is needed. Besides the equipment construction cost, the electricity cost and the denitration agent cost are millions of yuan each year (the roasting denitration cost of each ton of products is 20-30 yuan, the annual output of prebaked anodes of one enterprise is 10-100 million tons, and the cost is not small for prebaked anode production enterprises).
Disclosure of Invention
In order to solve the above problems, in one aspect, the present application provides a low-nitrogen roasting furnace, including a plurality of heating units adjacently connected and communicated with each other, where each heating unit includes at least one heating portion and at least one temperature measuring portion, at least one temperature measuring portion is disposed behind each heating portion, the heating portion and the adjacent temperature measuring portion located at the downstream of the flue gas flow form a control base point, and the average temperature of the control base point in the flue gas flow direction is gradually reduced. This application sets up through heating portion and temperature measurement portion cooperation, controls the power of heating portion through the one-to-one of temperature measurement portion and heating portion to have more accurate control to the temperature, reduce because the improper production of heating power nitrogen oxide that leads to of temperature control.
Preferably, still include furnace body and flue gas partition wall, the flue gas partition wall sets up between heating portion and the temperature measurement portion that the control basic point corresponds, the heating portion and the temperature measurement portion homonymy that the control basic point corresponds set up, the sealed butt setting of the inner wall of the furnace body of flue gas partition wall and corresponding control basic point one side. The flue gas partition wall of this application is mainly in order to make the flue gas flow along the route of "W" shape forward, and extension flue gas heat transfer route makes the flue gas heat be used for heating the product as much as possible.
Preferably, the furnace further comprises an auxiliary partition wall, the auxiliary partition wall is arranged between the adjacent control basic points, and the auxiliary partition wall is arranged on the inner wall of the furnace body on the other side relative to the control basic points. The utility model provides an auxiliary partition wall is used for separating heating portion and temperature measurement portion to prolong flue gas heat transfer route, as far as possible make the flue gas heat transfer give the product that needs the heating, also can make temperature control more meaningful, improve the reliability of temperature control in the roasting furnace.
Preferably, the furnace body is provided with a plurality of external communication holes; the heating part and the temperature measuring part are hermetically arranged in the outer communicating hole.
Preferably, the outer communication hole comprises an expansion cavity arranged outside the furnace body and a contraction cavity communicated with the expansion cavity, an installation platform is arranged between the expansion cavity and the contraction cavity, a fireproof piece is arranged on the installation platform, and an installation hole is formed in the fireproof piece.
Preferably, one side that the enlarged cavity is outwards is equipped with a sealing ring, one side that the sealing ring is towards the furnace body is equipped with an annular joint claw, annular joint claw slant sets up and inserts in the furnace body wall.
Preferably, the temperature measuring part is formed by a thermocouple through a mounting hole; the heating part is formed by a natural gas burner penetrating through the mounting hole.
Preferably, the low-nitrogen roasting furnace comprises 36-60 furnace chambers arranged in series, and the furnace chambers comprise two heating units arranged in series.
Preferably, the furnace chamber is provided with 4 external communication holes for installing the heating part and the temperature measuring part; the heating unit comprises 2 external communication holes which are respectively used for installing the heating part and the temperature measuring part.
On the other hand, the application also discloses a control method of the low-nitrogen roasting furnace, which comprises the following steps:
setting a control curve of the furnace temperature along the flow direction of the flue gas;
each temperature measuring part obtains the temperature control range thereof according to the control curve and establishes control connection with the heating part which is adjacent to the temperature measuring part;
when the temperature of the temperature measuring part can not reach the temperature control range, the temperature is adjusted by controlling the heating part which establishes the connection. According to the method, firstly, a control curve is set, then the temperature required to be controlled is obtained through the control curve, and then the temperature of the heating part is relatively accurately controlled through the corresponding relation between the temperature measuring part and the heating part, so that a good furnace temperature control effect is obtained.
This application can bring following beneficial effect:
1. the heating part and the temperature measuring part are arranged in a matched mode, and the power of the heating part is controlled through the one-to-one correspondence of the temperature measuring part and the heating part, so that the temperature can be controlled more accurately, and the generation of thermal nitrogen oxides caused by improper temperature control is reduced;
2. the smoke partition wall is mainly used for enabling smoke to flow forwards along a W-shaped path, prolonging a smoke heat transfer path and enabling smoke heat to be used for heating products as much as possible; the auxiliary partition wall is used for separating the heating part and the temperature measuring part, prolonging the heat transfer path of the flue gas, transferring the heat of the flue gas to a product to be heated as much as possible, making temperature control more meaningful and improving the reliability of temperature control in the roasting furnace;
3. according to the method, firstly, a control curve is set, then the temperature required to be controlled is obtained through the control curve, and then the temperature of the heating part is relatively accurately controlled through the corresponding relation between the temperature measuring part and the heating part, so that a good furnace temperature control effect is obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of an Europe thigh of the present application;
FIG. 2 is an enlarged view of portion A of FIG. 1;
fig. 3 is an enlarged schematic view of a portion B of fig. 1.
Detailed Description
In order to clearly explain the technical features of the present invention, the present application will be explained in detail by the following embodiments in combination with the accompanying drawings.
As shown in the drawings, the following detailed description is given by way of example in order to more clearly explain the overall concept of the present application.
In addition, in the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on those shown in the drawings, are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.
Furthermore, the terms "first", "second" and "first" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In a first embodiment, as shown in fig. 1-3, a low-nitrogen roasting furnace includes a plurality of heating units disposed adjacently and in communication, where each heating unit includes at least one heating portion 1 and at least one temperature measuring portion 2, at least one temperature measuring portion 2 is disposed behind each heating portion 1, and the heating portion 1 and the adjacent temperature measuring portion 2 located downstream of the flue gas flow form a control base point, and the average temperature of the control base point in the flue gas flow direction gradually decreases. Still include furnace body 3 and flue gas partition wall 4, flue gas partition wall 4 sets up between heating portion 1 and the temperature measurement portion 2 that correspond at the control basic point, heating portion 1 and the 2 homonymies of temperature measurement portion that the control basic point corresponds set up, flue gas partition wall 4 sets up with the sealed butt of inner wall of the furnace body 3 of the control basic point one side that corresponds. The furnace body is characterized by further comprising an auxiliary partition wall 5, wherein the auxiliary partition wall 5 is arranged between adjacent control base points, and the auxiliary partition wall 5 is arranged on the inner wall of the furnace body 3 on the other side relative to the control base points. A plurality of external communication holes 6 are formed in the furnace body 3; the heating part 1 and the temperature measuring part 2 are hermetically arranged in the outer communication hole 6. The outer communication hole 6 comprises an expansion cavity 7 arranged outside the furnace body 3 and a contraction cavity 9 communicated with the expansion cavity 7, an installation platform 10 is arranged between the expansion cavity 7 and the contraction cavity 9, a fireproof piece 11 is arranged on the installation platform 10, and an installation hole 12 is arranged on the fireproof piece 11. One side of the expanded cavity 7 facing outwards is provided with a sealing ring 8, one side of the sealing ring 8 facing the furnace body 3 is provided with an annular clamping claw 13, and the annular clamping claw 13 is obliquely arranged and inserted into the wall of the furnace body 3. The temperature measuring part 2 is formed by a thermocouple 14 penetrating through the mounting hole 12; the heating part 1 is formed by a natural gas burner 15 penetrating through the mounting hole 12. The low-nitrogen roasting furnace comprises 36-60 furnace chambers which are arranged in series and comprise two heating units which are arranged in series. The furnace chamber is provided with 4 external communication holes 6 for installing the heating part 1 and the temperature measuring part 2; the heating unit comprises 2 external communication holes 6 for installing the heating part 1 and the temperature measuring part 2 respectively.
When in use, the method is controlled according to the following steps:
s1, setting a control curve of the furnace temperature along the flow direction of flue gas;
when in use, if the temperature of the upstream and the downstream are controlled to be approximate, the temperature difference between the adjacent heating parts 1 is generally 15-20 ℃, namely the temperature of the downstream heating part is 15-20 ℃ lower than that of the adjacent upstream heating part;
s2, each temperature measuring part 2 obtains the temperature control range thereof according to the control curve and establishes control connection with the heating part adjacent to the temperature measuring part;
after the temperature measured by the temperature measuring section 2 fluctuates, it combines the temperatures of the temperature measuring section 2 of the upstream and downstream temperatures and the fluctuating temperatures, and then obtains the power of the heating section 1, for example, if the temperature decreases, the power of the heating section 1 needs to be increased, but if the power increase degree is too large, so that the temperatures of the upstream heating section and the downstream heating section are exceeded, the maximum value of the power is reached;
and S3, combining the specified values of the upstream and downstream temperature measuring parts and the temperature of the temperature measuring part 2, and when the temperature of the temperature measuring part 2 cannot reach the temperature control range, controlling the heating part 1 establishing the connection to adjust the temperature.
The upstream temperature is unstable before the transformation, can not reach the formulated temperature requirement, and too high temperature can cause the flue wall to damage and flue gas nitrogen oxide is too high for some, and the upstream temperature after the transformation can reach the appointed temperature relatively stably because the separate control.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A low-nitrogen roasting furnace is characterized in that: the heating unit comprises at least one heating part and at least one temperature measuring part, at least one temperature measuring part is arranged behind each heating part, the heating part and the adjacent temperature measuring part positioned on the downstream of the flowing of the flue gas form a control base point, and the average temperature of the control base point corresponding to the flowing direction of the flue gas is gradually reduced.
2. A low nitrogen baking furnace according to claim 1, wherein: still include furnace body and flue gas partition wall, the flue gas partition wall sets up between heating portion and the temperature measurement portion that the control base point corresponds, the heating portion and the temperature measurement portion homonymy that the control base point corresponds set up, the sealed butt setting of inner wall of the furnace body of flue gas partition wall and the control base point one side that corresponds.
3. A low nitrogen baking furnace according to claim 2, wherein: the furnace body is characterized by further comprising an auxiliary partition wall, wherein the auxiliary partition wall is arranged between the adjacent control base points, and the auxiliary partition wall is arranged on the inner wall of the furnace body on the other side relative to the control base points.
4. A low nitrogen baking furnace according to claim 2, wherein: a plurality of external communicating holes are formed in the furnace body; the heating part and the temperature measuring part are hermetically arranged in the outer communicating hole.
5. A low nitrogen baking furnace according to claim 4, wherein: the outer communicating hole comprises an expansion cavity arranged outside the furnace body and a contraction cavity communicated with the expansion cavity, an installation platform is arranged between the expansion cavity and the contraction cavity, a fireproof piece is arranged on the installation platform, and an installation hole is formed in the fireproof piece.
6. A low nitrogen baking furnace according to claim 5, wherein: one side that the enlarged cavity is outwards is equipped with a sealing ring, one side that the sealing ring is towards the furnace body is equipped with an annular joint claw, annular joint claw slant sets up and inserts in the furnace body wall.
7. A low nitrogen baking furnace according to claim 5, wherein: the temperature measuring part is formed by a thermocouple penetrating through a mounting hole; the heating part is formed by a natural gas burner penetrating through the mounting hole.
8. A low nitrogen baking furnace according to claim 1, wherein: the low-nitrogen roasting furnace comprises 36-60 furnace chambers which are arranged in series and comprise two heating units which are arranged in series.
9. A low nitrogen baking furnace according to claim 8, wherein: the furnace chamber is provided with 4 external communication holes for installing a heating part and a temperature measuring part; the heating unit comprises 2 external communication holes which are respectively used for installing the heating part and the temperature measuring part.
10. A control method of a low-nitrogen roasting furnace is characterized by comprising the following steps: the method comprises the following steps:
setting a control curve of the furnace temperature along the flow direction of the flue gas;
each temperature measuring part obtains the temperature control range thereof according to the control curve and establishes control connection with the heating part which is adjacent to the temperature measuring part;
when the temperature of the temperature measuring part can not reach the temperature control range, the temperature is adjusted by controlling the heating part which establishes the connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110326641.6A CN112944928A (en) | 2021-03-26 | 2021-03-26 | Low-nitrogen roasting furnace and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110326641.6A CN112944928A (en) | 2021-03-26 | 2021-03-26 | Low-nitrogen roasting furnace and control method thereof |
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| CN112944928A true CN112944928A (en) | 2021-06-11 |
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| CN202110326641.6A Pending CN112944928A (en) | 2021-03-26 | 2021-03-26 | Low-nitrogen roasting furnace and control method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0352470A2 (en) * | 1988-07-26 | 1990-01-31 | Vereinigte Kesselwerke Aktiengesellschaft | Method and combustion installation for burning fossil fuels with reduced formation of nitrogen oxides |
| JPH06300444A (en) * | 1993-04-12 | 1994-10-28 | Matsushita Electric Ind Co Ltd | Drying apparatus |
| US20120097154A1 (en) * | 2009-06-15 | 2012-04-26 | Rio Tinto Alcan International Limited | Control process for an anode baking furnace and adapted furnace using such process |
| CN107238289A (en) * | 2016-03-29 | 2017-10-10 | 沈阳铝镁设计研究院有限公司 | A kind of roaster is calcined control method |
| CN107462076A (en) * | 2016-06-03 | 2017-12-12 | 湖北强达环保科技股份有限公司 | A kind of heater for SCR methods denitrating system input flue gas |
| CN109347052A (en) * | 2018-12-10 | 2019-02-15 | 北京瑞莱博石油技术有限公司 | A kind of high voltage bearing hole multiline sealing structure |
| CN215217223U (en) * | 2021-03-26 | 2021-12-17 | 山东平阴丰源炭素有限责任公司 | Low-nitrogen roasting furnace |
-
2021
- 2021-03-26 CN CN202110326641.6A patent/CN112944928A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0352470A2 (en) * | 1988-07-26 | 1990-01-31 | Vereinigte Kesselwerke Aktiengesellschaft | Method and combustion installation for burning fossil fuels with reduced formation of nitrogen oxides |
| JPH06300444A (en) * | 1993-04-12 | 1994-10-28 | Matsushita Electric Ind Co Ltd | Drying apparatus |
| US20120097154A1 (en) * | 2009-06-15 | 2012-04-26 | Rio Tinto Alcan International Limited | Control process for an anode baking furnace and adapted furnace using such process |
| CN107238289A (en) * | 2016-03-29 | 2017-10-10 | 沈阳铝镁设计研究院有限公司 | A kind of roaster is calcined control method |
| CN107462076A (en) * | 2016-06-03 | 2017-12-12 | 湖北强达环保科技股份有限公司 | A kind of heater for SCR methods denitrating system input flue gas |
| CN109347052A (en) * | 2018-12-10 | 2019-02-15 | 北京瑞莱博石油技术有限公司 | A kind of high voltage bearing hole multiline sealing structure |
| CN215217223U (en) * | 2021-03-26 | 2021-12-17 | 山东平阴丰源炭素有限责任公司 | Low-nitrogen roasting furnace |
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