DE1442752C3 - Method and device for monitoring the temperature of a sintered grate intended for drying and firing of formations consisting of rock phosphates - Google Patents

Description

3 4

without interference from the radiation of the hot vault through an easily replaceable and for the in

bes permitted. According to the invention, the spectral range that comes into question is sufficient

is enough to cover the permeable cap from the underside of the grate plates.

the drawn strand of the sintered grate outgoing In the drawings is a device for

Thermal radiation as a measure of the temperature 5 Carrying out the method according to the invention

of the grate plates over a large area. the whole shown schematically. It shows

Width of the sintered grate using the prin- F i g. 1 shows a cross section through a phosphate

zips the infrared radiation measurement continuously teranlage according to line I-I of FIG. 2,

is recorded and evaluated quantitatively, the Fig. 2 is a longitudinal section through part of a

Monitoring area proportions of the underside of the io phosphate sintering plant,

Grate plates optically on the sensor element of the Infra- F i g. 3 is a longitudinal section of an advantageous to

red radiation receivers are mapped. Protection of the optics of the infrared radiation receiver

The method according to the invention can expediently.

application can optionally also be characterized in FIG. 1 is the running direction of the sintered grate,

that 15 which from a drawn run 3 and back

a) the determination of the temperature radiation for fenden strand 4 exists, perpendicular to the symbol at least two in the direction of the drawn plane. Above the drawn strand 3 is located Trumms of the sintered grate one behind the other are a vault 2. In the lower part 1 of the sintering plant Grate cross-sections are made; Above the backward ending strand 4 right and

b) those used to determine the temperature radiation 20 to the left of this in a common plane infra Grate cross-sections are arranged in the area of red radiation receivers 7, 8, which are aligned with the combustion zone and in the following ver so that each is assigned to it because and hardness zone lie. and appearing to him from the angle of view α

A device for carrying out the inventive half the width of the sintered grate with some mutual method according to the invention is monitored in detail as a result of the overlap. With regard to the hogemarked that each measuring point consists of two infrared ambient temperatures, each infrared radiant red radiation receiver, which is surrounded on the right and lung receiver by a double-walled protective link below the drawn strand of the sintered pink box 5, 6, which via lines 12, Stes are arranged in one plane, each of which can be acted upon with a flowing coolant, for example the infrared radiation sensor assigned to it, 30 white water. On the lens tube, the infrared radiation receiver, which appears at an angle of view α, is monitored for each half the width of the sintered grate; that the inser tube 9 is attached to which the in F i g. 3 dargefrarot radiation receiver in the area of the focal point cap 10 with protective glass 11 can be placed.
chamber arranged and to a minimum to be complied with. and that the infra- 35 of the plane of the drawing, with the drawn strand 3 covered with raw phosphorous red radiation receiver at the beginning of the dwell phate moldings 18, arranged in and hardening chamber and moving in a permissible direction of the arrow. The vault 2 has two opening maximum temperatures are set. openings through which combustion chambers 15, 16, In the method according to the invention, the guiding element is separated from each other by partition walls 19, 20, the infrared radiation receiver is separated from 40, with the burners 14, which are seated on the vault 2, and which extend from the underside of the grate plates are connected. Radiation is illuminated at the combustion chamber so that it is also locally followed by a dwell and hardening chamber 17 of the grate plates, for example local overheating, which is also separated from this by twentieth deviations from the mean temperature partition walls. At the beginning of the dwell and curing chamber 17, affect the measurement result. 45 is a measuring point, the infrared beam Da the infrared radiation of the free gas volume treatment receiver 7 ', 8' are set to a permissible maximum at the monitored temperatures, ie up to temperature, while the measurement is about 600 ° C, in relation In comparison to their performance in the area of the combustion chamber 16, the radiation of a solid black body, which forms very infrared radiation receivers 7, 8, is very small, the temperature measurement is practically set to a minimum temperature of 50,
independent of the flowing gases. When the specified temperature is submitted, the radiation door is used by the infrared radiation receivers for the temperature monitoring range from the visible to the long-wave current switching pulse in a known manner via infrared. Relay a signaling device in action, which indicates the need to change the mode of operation of the catcher in the area of the combustion chamber to something like the sintering plant by setting the infrared radiation sensitivity. So with an executed 550 ° C and the setting of the infrared radiation phosphate sintering system in its regulating unit, a receiver at the beginning of the dwell and hardness chamber green light is triggered when the infrared radiation mer is reached to about 600 ° C that the Verprö- receivers 7, 8 signal the drop in temperature with the sintering grate as a result of the steep temperature- 60 the required minimum level, while change is avoided and the raw phosphate blanks that leave the sintering system when the maximum permissible temperature is exceeded - the infrared radiation receiver T, 8 'are burned in the Reguchend. lierwerk trigger a red light.

Because of the always present in sintering plants, with the help of these switching impulses it is also possible Corrosive gases 65 containing fluorine compounds prevent the operation of the sintering plant in the case of the appropriate

and the inevitable accumulation of dust, it is advantageous to fully automate the cost of switching units

stick to the optics of the infrared radiation receiver.

1 sheet of drawings

Claims (4)

1 2 according to a particular degree of destruction claims: is exposed to temperature. In "The Review of Scientific Instruments", Vo- 1. Method for monitoring temperatures 23 (1952) No. 1, pp. 52 and 53, becomes a single door one for drying and firing from 5 directions with electronic temperature monitoring Rock phosphates existing formations have been described as a source of black radiation, Correct sintered grate, thus identifying which in the temperature range from 200 to 500 ° C draws that that can be applied from the bottom of the. This facility is we-Rostplatten the drawn strand of the sintered roe of the precisely known spectral composition outgoing thermal radiation as a measure of the radiation emitted from it specifically for for the temperature of the grate plates on a large calibration of infrared radiation receivers suitable surface over the entire width of the sintered grate below. ier application of the principle of infrared ray Common methods for temperature measurement measurement is continuously recorded quantitatively and often use a punctiform or given is evaluated, whereby the 15 to be monitored, possibly also linearly stretched temperature sensors Area proportions of the undersides of the grate plates Ier, which, while he is on the temperature of the is optically brought to the sensing element of the infrared beam measuring point, one of its physical recipients are mapped. Properties in one of the height of the temperature 2. The method according to claim 1, characterized in a manner that is dependent on the measurement technology and can be easily detected indicates that the determination of the temperature changes. Are used for this in particular tur radiation for at least two in the direction of travel thermocouples and resistance thermometers. at of the drawn strand of the sintered grate behind - a sintering plant for drying and firing Contiguous grate cross-sections made from formations consisting of rock phosphates, in which, for example according to German patents 1,167,317 3. The method according to claim 2, characterized in 25 and 1 189 053, but provides the one or more identifies that the temperature radiation determined to determine the temperature point-like measuring points The grate cross door used is not a useful guide to the tempera cuts in the area of the combustion zone and in the door of the sintered material or the sintered grate that follows it The dwell and hardening zones are located. to be able to eat. If the temperature is 4. Device for carrying out the decay sensor above the sintered grate, so act on it rens according to one of claims 1 to 3, characterized in that the radiation emanating from the hot vault, the characterized in that each measuring point consists of two radiation emitted by the sintered material and the radiation emitted by Infrared radiation receivers (7, 8 or 7 ', 8') due to the amount of heat transferred to the flowing gases stands, which right and left below the drawn one, while with the arrangement of the Temperaturfühgener Trumms (3) of the sintered grate in a 35 lers below the sintered grate of the temperature sensor Level are arranged, with each infrared depending on the quality of the sintered material and the type of radiation receiver (7, 8, 7 ', 8') which it tends to drive with varying intensity from the stream-ordered, him at an angle of view λ ermer Gaser, is hit. Apparent half the width of the sintered grate. The drawn strand of the sintered grate is awake; that the infrared radiation receiver (7, 40 nem way from the point of application of the not yet ge-8) arranged in the area of the combustion chamber (16) burned rock phosphate moldings until they are down and at a minimum temperature to be maintained in the burned state a periodically adjusted are; and that the infrared radiation blinds, considerable heat stress receivers (T, 8 ') at the beginning of the dwell and sets. The temperature of the briquettes is initially arranged in the curing chamber (17) and gradually adjusted to a maximum temperature of around 150 ° C in the drying zone. increased to about 400 ° C, while in the following lowing combustion zones to about 900 to 1000 ⁰ C is increased. Finally, the briquettes in the dwell and hardening zone are about 900 ° C., with 50 the temperature in the gas space above about 700 to 800 ° C and below the sintered grate should not be more than about 600 ° C. Such a limitation is necessary because on the one hand According to the German Auslegeschrift 1 082 849, the sintered grate is formed if the temperature change is too abrupt To secure a Lepol grating, the temperature is un- 55 due to the embrittlement of the verterhalb used to make it of the grate in the area of the hot and dry-turned alloy steel wears out prematurely, anchoring chamber determined. Information about the type and on the other hand, however, at lower temperatures the In the way of temperature measurement, these laid-out rock phosphate moldings are not fired so pressure-resistant script not to be taken. that they will be able to From "Stahl und Eisen" 72 (1952), No. 23, p. 1418, 60 mix phosphorus furnaces can be used,
to 1426, it is known to measure the temperature of It is therefore the object of the present invention, Sicmens-Martin furnace vaults and electric arcs - a method for monitoring the temperature Oven cover photo element pyrometer to be used. one for drying and firing i ".is Rohphos-Dazii a water-cooled sounding tube is built into the formations made of the side phatcn of the stove, the inclination of the 65 grate to create which the above Pcilrohres is chosen in such a way that with the at it an- Disadvantages that the pimktfönnige temperature measurement Flanged pyrometer such a place of the furnace in the gas space does not adhere to which one vault or lid is targeted, which experienced rather the determination of the part: sintered rust