RU13570U1 - DEVICE FOR FUEL COMBUSTION IN TECHNOLOGICAL FURNACES - Google Patents

Description

A device for burning fuel in process furnaces.

The utility model relates to a power system and can be used to burn fuel in technological furnaces of engineering plants, combustion chambers, and boiler furnaces.

A device for burning natural gas when blowing air in tube furnaces for primary reforming of the oil refining, petrochemical and gas industries is known, in which the air supply is regulated by rotary gates - regulators (see VNII Neftemash, burners for tube furnaces, catalog, M., 1990, p. .fifteen ).

However, the known device does not allow you to adjust the flame in the burner.

A device for burning fuel containing burners and means for controlling the extinction of a flame in a burner is known, comprising an optical circuit, a photosensitive element and an electronic module, by which, when a flame appears in the field of view of the photosensor, a signal will appear at the output of the electronic unit that provides information about the presence of flame , or about its extinction. (See General Machine LLC. Flame Extinction Sensor SL.90. Technical Description.)

The disadvantage of this device is that if there is a kindling and main burner in the same plane, it will respond to all sources

F23D14 / 00 of radiation and will not allow to distinguish the moment of disappearance of a kindling flame

burners.

The technical problem solved by the utility model is to increase reliability due to the accuracy of recording the moment of extinction of the flame in the burner.

The solution to this problem is provided due to the fact that the device for burning fuel in furnaces for various purposes, containing a burner located in the burner unit, and means for controlling the extinction of the flame in the burner, according to the latest model, the means for controlling the extinction of the flame in the burner is made in the form of a heat-sensitive element with an electrical output signal, the device is equipped with a unit for recording the maximum value of the derivative of the electrical output signal of the heat-sensitive element, while m thermosensitive element is installed in the burner in the part of the largest gradient of temperature change of its surface, and its output is connected in series with the input of the recording unit of the maximum value of the derivative of the electrical output signal.

In FIG. 1 shows a longitudinal section of a device.

Figure 2 - functional diagram of the device.

2

The device comprises a burner 1 installed in the burner block 2, means for controlling the extinction of the flame in the burner, made in the form of a heat-sensitive element 3 with an electrical output signal, block 4

registering the maximum value of the derivative of the electrical output signal of the thermosensitive element 3 installed in the burner 1 in terms of the largest change in temperature of its surface, the output 5 of the thermosensitive element 3 is connected in series with the input 6 of the unit 4 for recording the maximum value of the derivative of the electrical output signal.

The device operates as follows.

Burned fuel is fed into the cavity of the burner at its exit. During combustion, uneven heating of the burner body occurs. When the burner flame goes out, the burner body unevenly heats up, its body cools according to an exponential dependence

(T AifN / g) X

where T is the surface temperature of the burner,

A is the coefficient of proportionality,

t is the time (s),

g is the time constant determined by the design of the burner and the location

location of the heat-sensitive element.

Due to the fact that the surface of the burner heats up (cools) unevenly, the parameter g has different values in different parts of the burner,

 s

why it was necessary to determine the place (point) on the burner, in which the parameter g has a minimum value.

As a result of studies, it was found that on the surface of the burner (about 1/3 of the upper part of the burner) the minimum value of the coefficient g is achieved, and therefore, the gradient of the temperature change of the surface of the burner.

Accordingly, when a thermosensitive element with an electrical output signal is located at a certain point in the burner, the rate of change of the output signal will be maximum.

Since the process takes a considerable period of time until it cools completely, it is advisable to fix the maximum value of the derivative, and at this moment shut off the fuel supply to the burner cavity, and thereby prevent emergency situations.

The presence of the registration unit of the maximum value of the derivative of the electrical output signal of the heat-sensitive element, the location of the latter in a specific place of the burner and the connection of the output of the heat-sensitive element with the input of the registration unit of the maximum value of the derivative of the electrical output signal can improve the reliability of the device as a whole due to the accuracy of recording the moment

extinguishing the flame in the burner, thereby preventing emergency situations and ensuring safe operation in the future.

The applicant is the patent holder of LLC NPK Kedr - 89 General Director K. Baklashov

Claims (1)

A device for burning fuel in process furnaces containing a burner located in the burner unit and means for controlling the extinction of the flame in the burner, characterized in that the means for controlling the extinction of the flame in the burner is made in the form of a heat-sensitive element with an electrical output signal, the device is equipped with a registration unit the maximum value of the derivative of the electrical output of the thermally sensitive element, while the thermally sensitive element is installed in the burner in the part of the largest radienta change its surface temperature and its output connected in series with the input register unit of the derivative maximum value of the electric output signal.