GB2129165A - Controlling kilns - Google Patents
Controlling kilns Download PDFInfo
- Publication number
- GB2129165A GB2129165A GB08327389A GB8327389A GB2129165A GB 2129165 A GB2129165 A GB 2129165A GB 08327389 A GB08327389 A GB 08327389A GB 8327389 A GB8327389 A GB 8327389A GB 2129165 A GB2129165 A GB 2129165A
- Authority
- GB
- United Kingdom
- Prior art keywords
- firing
- information
- temperature
- kiln
- heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/40—Arrangements of controlling or monitoring devices
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27M—INDEXING SCHEME RELATING TO ASPECTS OF THE CHARGES OR FURNACES, KILNS, OVENS OR RETORTS
- F27M2001/00—Composition, conformation or state of the charge
- F27M2001/15—Composition, conformation or state of the charge characterised by the form of the articles
- F27M2001/1504—Ceramic articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Tunnel Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Feedback Control In General (AREA)
Abstract
A further development of Serial 2107904A provides for the detection of disturbance variables, particularly mass flow, within the heating, firing and cooling zones. Information is obtained on the course which the temperature is expected to take in a zone at the kiln by one or more additional upstream measuring points and is then conveyed to a regulating apparatus and the regulating section initially influenced synchronously in accordance with the dynamic characteristics of the section. Stochastic disturbance factors which do not influence the over-all process or which owing to the brief duration of their influence cannot be balanced out, are eliminated for the stabilization of the process, information on the operating state being obtained from one or more measuring points and evaluated according to a mathematical model or determined by mathematical means only from a measuring point by forming gradients for the temperature characteristics in each case.
Description
SPECIFICATION
Controlling kilns for firing ceramic products
This relates to the controlling of kilns used for firing ceramic products and is an improvement to the method described in application 8229680 (2107904A). In this prior application there is provided a method for predetermining disturbances caused to the conditions in a kiln for firing ceramic products, wherein the parameters which affect the firing, such as the mass and/or geometry of the kiln transport means, are detected at a point in the travel path of the transport means, the information detected being used for control at fixed points in the heating, firing and cooling zones of the kiln to optimize the firing conditions.
According to specification 2107904, (not prior published), those parameters of a transport means (hearth carriage or slide) which determine the firing process and which result from the total mass of the loaded transport means less the tare subordinate to the firing process and the geometry of the super-structure on the transport means, are detected at any desired point in the conveyor system of the transport means outside the tunnel or continuous kiln. The information obtained is conveyed to a computing system for the processing of the data. The data is used for pre-optimising the heating, firing and cooling zones. We have found that the processing of the information obtained is not adapted to the firing process long enough to enable the firing of ceramic products to be influenced in the necessarily optimum manner.
An object of this invention is to enable the temperature variations which occur inside the tunnel or continuous kiln at fixed points in the heating, firing and cooling zones and which are caused by variable mass flow disturbances to be compensated by an optimum technique and anticipatory energy reactions.
The stabilization of the firing process in the heating, firing and cooling zones is intended to provide the conditions for the introduction of an optimum firing curve, thus enabling the specific energy consumption to be reduced and the furnace performance improved, in addition to rendering the firing process hardware more durable and ensuring a better-quality product.
This invention seeks to extend the method for detecting the mass flow outside tunnel and continuous kilns, according to 2107904, to provide for the detection of the disturbances inside the heating, firing and cooling zones.
This invention enables this object to be achieved by a method in which, through one or more additional measuring points preceding the fixed points, in the area of the heating, firing and cooling zone which is to be stabilized, reliable information is obtained on the course which the temperature is expected to take in the stabilizing zones. This information is conveyed to a regulating apparatus and the regulating section is preliminarily influenced synchronously in accordance with the dynamic characteristics of the said section.
Stochastic disturbance factors which do not influence the over-all process or which due to the short duration of influence cannot be balanced out, are eliminated for the stabilization of the process, information on the operating state being obtained from one or more measuring points and evaluated according to a mathematical model or determined by purely mathematical means from a measuring point by forming gradients for the temperature characteristics in each case.
Example
This invention will be explained in greater detail by reference to an example.
The predominant disturbance variable which is the mass flow, which in the firing process causes the temperature to drop when lightly loaded hearth carriages or slides are replaced by more heavily loaded ones or causes it to increase in the reverse case, is detected by additional measuring points. These measuring points precede the zone to be stabilized. In one or more furnace areas advance information is obtained on the course which the temperature is expected to take in the zone to be stabilized, as a result of the change in the mass flow. By means of a simple mathematical model a significant decision is taken concerning the disturbance variable due to an appreciable mass flow change or to stochastic parameters resulting from the specific features of the ceramic firing process.
Temperature changes caused by structural
differences in the hearth truck such as saggar or
partitition loading, or different assortments are detected by additional measuring points. This
evaluation is also carried out by a simple
mathematical model or by purely mathematical
means, the disturbance being calculated from one
measuring point only, by calculating the rise of fall
in the temperature course in each case. If the
value obtained is within a temperature fluctuation
range corresponding to a permissible tolerance
band, this change is eliminated. In the event of a
deviation from the tolerance band of the
measuring points provided or if the temperature
takes the same course at two or more measuring
points, this acts on the control device via a
differentiation element. The information points
are so arranged that the distance between them
does not exceed the length of a hearth truck or
slide.
The regulated value in the zone to be stabilized
is controlled in advance by taking into account the
transition characteristics of the regulating section
and by the aid of a computer programme, so that
in the said zone the mass flow disturbance is
balanced out. The computer programme for the
pre-optimization contains the rate of feed through
as a variable.
Claims
1. Method for predetermining disturbances
caused to the conditions in a kiln for firing
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (2)
1. Method for predetermining disturbances
caused to the conditions in a kiln for firing ceramic products, wherein the parameters which affect the firing, such as the mass and/or geometry of the kiln transport means, are detected at a point in the travel path of the transport means, the information detected being used for control at fixed points in the heating, firing and cooling zones of the kiln to optimize the firing conditions, characterized by:
a) one or more additional measuring points
within the tunnel furnace or continuous
furnace preceding the zone of the heating,
firing and cooling zones which is to be
stabilized, and
b) the information obtained for the zone to be
stabilized being conveyed to a control
apparatus.
2. Method for predetermining disturbances in kilns substantially as described herein and exemplified.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DD24410782A DD218948A2 (en) | 1982-10-19 | 1982-10-19 | PROCESS FOR PREVIOUS OPTIMIZATION OF THE PUNCTURE MASS DRUM |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8327389D0 GB8327389D0 (en) | 1983-11-16 |
GB2129165A true GB2129165A (en) | 1984-05-10 |
Family
ID=5541855
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08327389A Withdrawn GB2129165A (en) | 1982-10-19 | 1983-10-13 | Controlling kilns |
Country Status (3)
Country | Link |
---|---|
JP (1) | JPS59135505A (en) |
DD (1) | DD218948A2 (en) |
GB (1) | GB2129165A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0541982A1 (en) * | 1991-11-12 | 1993-05-19 | Transtec | Process for operating a tunnel furnace |
EP2813584A1 (en) * | 2013-06-11 | 2014-12-17 | Linde Aktiengesellschaft | System and method for quenching a heated metallic object |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN112441814B (en) * | 2020-11-19 | 2023-01-24 | 凤台县天宝建材有限责任公司 | Gangue shale baked brick manufacturing system |
-
1982
- 1982-10-19 DD DD24410782A patent/DD218948A2/en not_active IP Right Cessation
-
1983
- 1983-10-13 GB GB08327389A patent/GB2129165A/en not_active Withdrawn
- 1983-10-19 JP JP19442683A patent/JPS59135505A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0541982A1 (en) * | 1991-11-12 | 1993-05-19 | Transtec | Process for operating a tunnel furnace |
EP2813584A1 (en) * | 2013-06-11 | 2014-12-17 | Linde Aktiengesellschaft | System and method for quenching a heated metallic object |
Also Published As
Publication number | Publication date |
---|---|
DD218948A2 (en) | 1985-02-20 |
JPS59135505A (en) | 1984-08-03 |
GB8327389D0 (en) | 1983-11-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4688180A (en) | Pattern-switching temperature control apparatus | |
US4807144A (en) | Temperature control system for glass sheet furnace | |
US4696115A (en) | Method and apparatus for drying wet particulate material to a predetermined uniform moisture content | |
EP3409797B1 (en) | Steel sheet temperature control device and temperature control method | |
GB1245276A (en) | Improvements in method and apparatus for cement kiln control | |
JPS61125618A (en) | Temperature controller of pattern switching type | |
GB2129165A (en) | Controlling kilns | |
US3366374A (en) | Method and apparatus for control of rotary kiln exit gas conditions | |
GB2146464A (en) | Heating furnace control | |
EP1073872B1 (en) | Apparatus for conducting gas through material to be sintered | |
FR2155397A5 (en) | Billet heating - in computer controlled through furnace | |
JPH08170880A (en) | Baking method for sintered ore | |
SU815446A1 (en) | Method of automatic control of heat condition of conveyer line for sintering ceram ic articles | |
GB2107904A (en) | Controlling kilns | |
JP2512917B2 (en) | Temperature control method for processed products | |
JPS5959837A (en) | Controlling method of heating furnace | |
SU1455200A1 (en) | Device for controlling process of heat treatment of material in rotary furnace | |
SU691663A1 (en) | Apparatus for the automatic control of roasting process in a slit furnace | |
JPH03215630A (en) | Operating method for sintering machine | |
JPS63119922A (en) | Control method for pitch during rolling | |
JPS63228589A (en) | Control of bullet heater | |
Mytrofanov | Improvement of the control process of the heat treatment of iron ore pellets in the preheating area of the conveyor-type roasting machine | |
JPS5831373B2 (en) | Temperature control method and device for continuous strip heat treatment furnace | |
SU985658A1 (en) | Method of automatic control of convective drying process of ceramic articles in conveyer drier | |
SU392311A1 (en) | LIBRARY? GCS. <- vt ~, "~. ,, - \?, - vВ. P. Malyshev, V. A. Yarygin, I. A. Zadorin, V. G. Shkodinmednoy industry |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |