Method of measurement and regulation of the temperature of the combined glass-fiber pipes in the chamber of polymerization

FIELD: chemical industry; chemical engineering; methods of production of the glass-fiber material pipes in the chamber of polymerization.

SUBSTANCE: the invention is pertaining to chemical industry, in particular, to chemical engineering and may be used at manufacture of the combined glass-fiber pipes, in particular, at their polymerization. The method of measurement and regulation of the temperature of the combined glass-fiber pipes in the chamber of polymerization includes installation of the temperature sensors of the heat streams reflected by the pipes and the surrounding heat field, heating of the rotatable pipes by the infrared lamps, registering the temperature readings from the temperature sensors and the voltage regulation of the infrared lamps power supply depending on the readings of the sensors and the pipe required temperature. The method provides, that the heat streams temperature sensors are mounted above the pipe and under the pipe, they take the sensors temperature readings and determine the pipe temperature by calculation in compliance with the ratio: where Tp is the calculated temperature of the pipe, TUP and TL are the readings of the upper sensor (above the pipe) and the lower sensor (under the pipe) accordingly, K - the correction factor - the ratio of the real temperature to the calculated temperature for the heated up pipe and the given type and size of the pipes. After that they regulate the voltage of the infrared lamps power supply to change the temperature the pipe from the calculated temperature Тр up to the required temperature. The method ensures the temperature measurement and regulation accuracy of the combined glass-fiber pipes in the chamber of their polymerization.

EFFECT: the invention ensures the temperature measurement and regulation accuracy of the combined glass-fiber pipes in the chamber of their polymerization.

3 cl, 2 dwg

 

The invention relates to the field of thermometry.

There is a method of measuring and controlling the temperature of products in the reflective infrared ovens (for example, composite fiberglass tubes polymerization), which includes the installation of temperature sensors, heat flux carried by the pipe, heating the rotating tube lamps infrared radiation, measurements of the temperature sensors and voltage regulation of power lamps infrared radiation depending on the sensors and the desired temperature, which is seen in the source Dbversion and other "Reverberatory furnace infrared heating", Moscow, Mashinostroenie, 1985, p.114-115.

By its characteristics and the achieved result this method is most similar to the claimed and adopted for the prototype.

The disadvantage of this method is a significant error of measurement of the temperature of the heated object, which is explained by insufficiently accurate account of the influence of the heating cavity of the oven (camera polymerization) to the actual temperature of the object of heating (combined GRP pipes).

The objective of the invention is to improve the accuracy of measurement and temperature control combined GRP pipes.

This problem is solved by the improvement of the method of measurement and regulirovanie the temperature of the combined GRP pipes in the chamber of the polymerization including installation of temperature sensors, heat flux carried by the pipe and the surrounding thermal field, the heating of the rotating tube lamps infrared radiation, the reading of the temperature sensors and voltage regulation of power lamps infrared radiation depending on the sensors and the desired temperature of the pipe.

The improvement is that the sensors are temperature heat fluxes over the pipe and under the pipe, remove from them the evidence and determine the temperature of the pipe is calculated in accordance with the equation:

where Tr is the calculated temperature of the pipe;

TV, T is the temperature of the upper (above the pipe) and the bottom (under the pipe) sensors, respectively;

K - correction factor - the ratio of the actual temperature with the calculated heated tube and a given size of pipe,

then regulate the voltage lamps infrared radiation to change the pipe temperature TP to the desired.

In variants of the method the temperature sensors mounted on spaced parallel pipes mandrels with a diameter of 50 mm and a length of 500 mm is wound on the mandrel layers of fiberglass at a distance of 1/3 of its thickness from the surfaces of the latter;

when determining the correction factor To factor the practical temperature for each of the combined size of the pipe measured at the junction of the inner polymeric layer and an outer fiberglass.

Installation of temperature sensors heat fluxes over the pipe and under the pipe, removing from them the evidence and determining the temperature of the pipe is calculated in accordance with the equation:

(explanation see above)

provided that the actual temperature of the pipe in a contactless manner with high precision.

Subsequent adjustment of the voltage lamps infrared radiation to change the pipe temperature from the reference temperature Tr to the desired allows you to adjust the polymerization process of the pipe with high precision.

Installation of temperature sensors in parallel to the pipe mandrel with a diameter of 50 mm and a length of 500 mm is wound on the mandrel layers of fiberglass at a distance of 1/3 of its thickness from the surfaces of the latter allows to reduce the misalignment readings of the temperature sensors with the actual temperature of the pipe.

Perform measuring the actual temperature for each of the combined size of pipe (in the determination of the correction factor K) at the junction of the inner polymeric layer and an outer fiberglass improves the accuracy of measuring the actual temperature fiberglass layer composite pipe.

Below, with reference to the attached drawing, which shows:

figure 1 - scheme to PTA invention;

2 is a diagram to claim 2,

describe the proposed method of measuring and controlling the temperature of the combined GRP pipes in the chamber of the polymerization, for example, one pipe.

In the process in the chamber of polymerization pre-installed on technological mandrel 1 combo tube 2 having an inner polymer layer 3 and the outer fiberglass 4.

The method includes the installation of sensors 5, 6 temperature heat flow carried by the pipe and the surrounding thermal field, the heating of the rotating tube 2 lamps 7 infrared radiation, measurements of the temperature sensors 5, 6 and regulation of the supply voltage (Fig. not shown) lamps 7 infrared radiation depending on the sensors 5, 6 and the desired temperature of the pipe 2.

The method is characterized by the fact that sensors are temperature heat fluxes over 5 pipe 2 and 6 under the pipe, remove from them the evidence and determine the temperature of the pipe 2 by calculation in accordance with the equation:

(explanation see above),

(which provides for the determination of the actual temperature of the pipe with high precision).

Then regulate the voltage of the lamps 7 for changing the temperature of the pipe 2 from the calculated Tr to the desired (that is allows you to adjust the polymerization process of the pipe with high precision).

In variants of the method:

the sensors 5, 6 temperature set on located parallel to the pipe 1, the mandrel 8 with a diameter of 50 mm and a length of 500 mm is wound on the mandrel layers 9 of fiberglass at a distance of 1/3 of its thickness (3...5 mm) from the surface 10 of the last (which reduces the misalignment readings of the temperature sensors with the actual temperature of the pipe).

When determining the correction factor To the actual temperature for each size of the combined pipe 2 is measured at the junction of the inner polymer layer 3 and outer fiberglass 4 (thereby improving the accuracy of measuring the actual temperature fiberglass layer composite pipe).

The method according to the invention (by considering the influence on the temperature of the pipe thermal field from the side of the pipe opposite to the heating lamp 7) is characterized in comparison with the prototype high precision measurement and temperature control rotate combined GRP pipes of polymerization in the cell.

1. The method of measurement and temperature control combined GRP pipes of polymerization in the cell, including the installation of temperature sensors, heat flux reflected by the pipe and the surrounding thermal field, the heating of the rotating tube lamps infrared radiation, removing paragraph is meted temperature sensors and voltage regulation of power lamps infrared radiation, the readings of the temperature sensors and voltage regulation of power lamps infrared radiation depending on the sensors and the desired temperature of the pipe, characterized in that the sensors are temperature heat fluxes over the pipe and under the pipe, remove from them the evidence and determine the temperature of the pipe is calculated in accordance with the relation

,

where Tp is the calculated temperature of the pipe;

TV, T is the temperature of the upper (above the pipe) and the bottom (under the pipe) sensors, respectively;

K - correction factor - the ratio of the actual temperature with the calculated heated tube and a given size of pipe,

then regulate the voltage lamps infrared radiation to change the pipe temperature from the target temperature Tp to the desired.

2. The method according to claim 1, characterized in that the temperature sensors are installed in parallel to the pipe mandrel with a diameter of 50 mm and a length of 500 mm is wound on the mandrel layers of fiberglass at a distance of 1/3 of its thickness from the surface of the latter.

3. The method according to claim 1, characterized in that when determining the correction factor To the actual temperature for each of the combined size of the pipe measured at the junction of the internal polymer the layer and outer fiberglass.



 

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