RU193860U1 - FIRE-RESISTANT CHANNEL OF THE BURNER DEVICE FOR PLASMA IGNITION OF THE FUEL OF THE BURNERS OF THE HEAT UNIT - Google Patents

Abstract

The utility model relates to the field of heat power engineering and can be used in thermal power plants and industrial boiler houses. The refractory channel of the burner device for plasma ignition of the fuel of the burners of the thermal unit contains: a cylindrical body made of heat-resistant steel, lined on the inside with two layers of ceramic half rings that bound the inner channel; an inlet channel made of heat-resistant steel mounted on a flange of the aforementioned cylindrical body, comprising a water-cooled jacket mounted on its wall at the location of the hole for installing the ignition device; and a cylindrical outlet channel, which is a continuation of the aforementioned case made of heat-resistant steel and lined on the inside with one layer of ceramic half rings defining the inner channel. EFFECT: increased reliability and increased service life of the refractory channel of the burner device. 2 s.p. f-ly, 3 ill.

Description

Area of use

The utility model relates to the field of heat power engineering and can be used in thermal power plants and industrial boiler houses.

State of the art

The refractory channel of the burner device for plasma ignition of the fuel of the burners of a thermal unit, adopted as a prototype of the claimed utility model, is known, which contains two cylindrical concentric channels separated by a refractory wall: internal for supplying a dust-air mixture using dust of the same fuel as in the main burners; and external for secondary air supply. Moreover, at the input section of the internal channel, a hole is made for installing the ignition device in the form of an air plasma torch. In this case, the inlet section at the installation site of the plasma torch is made in the form of a narrowing having the shape of an equilateral triangular prism with rounded corners. Moreover, the inner equilateral triangle of the cross section of the prism is inscribed with rounded corners in the circumference of the inner channel from the exit side of it by the ignited plasma of the dusty air mixture. In this case, the diameter of the inner channel at the inlet section from the side of the dust-air mixture into the narrowing is selected so that the circle corresponding to this diameter is inscribed in the indicated equilateral triangle, and each plasmatron can be installed on the edge of the prism so that its longitudinal axis is oriented in the side of the vertex of the indicated equilateral triangle (RU 2300053 C1, F23Q 9/00, 05.27.2007 [1]).

The disadvantages of the technical solution known from [1] are the high manufacturing cost, the large mass of the device, the insufficient protection of the channel surface from possible mechanical, thermal, physical and chemical damage, insufficient thermal insulation of the channel and the lack of cooling of the input channel.

Utility Model Disclosure

The objective of the claimed utility model is to reduce the cost of kindling the boiler, and the technical result is to increase reliability and increase the service life of the refractory channel of the burner device.

The solution of this problem by achieving the specified technical result in relation to the claimed utility model is ensured by the fact that the refractory channel of the burner device for plasma ignition of the fuel of the burners of the thermal unit contains: a cylindrical body made of heat-resistant steel, lined on the inside with two layers of ceramic half rings that bound the inner channel; an inlet channel made of heat-resistant steel mounted on a flange of the aforementioned cylindrical body, comprising a water-cooled jacket fixed to its wall at the location of the hole for installing the ignition device; and a cylindrical outlet channel, which is a continuation of the aforementioned case made of heat-resistant steel and lined on the inside with a single layer of ceramic half rings defining the inner channel.

A causal relationship between the set of essential features of the patented utility model and the achieved technical result is that the lining on the inner side of the cylindrical body made of heat-resistant steel with two layers of ceramic half rings defining the inner channel, as well as the lining on the inside of the output cylindrical channel made of heat-resistant steel , which is a continuation of the aforementioned cylindrical body, with one layer of ceramic semirings bounding the inner channel It protects the channel surface from possible mechanical, thermal, physical and chemical damage, and also improves the thermal isolation channel, which improves the reliability and extend the life of the refractory channel of the burner. It should also be noted that the lining on the inside with precisely two layers of ceramic half rings of a cylindrical body made of heat-resistant steel reduces the likelihood of cracking of these half rings due to a more uniform distribution of thermal stresses. At the same time, the presence of a water-cooled jacket mounted on the wall of the inlet channel made of heat-resistant steel, mounted on the flange of the cylindrical body, at the location of the hole for installing the ignition device, provides reliable cooling of the inlet channel, which also improves reliability and increases the service life of the refractory channel of the burner device.

Brief Description of the Drawings

In FIG. 1 shows a refractory channel of a burner device in longitudinal section along the axis of symmetry. In FIG. 2 shows a view of the refractory channel in section BB. In FIG. 3 shows the joints of the first and second layer of half rings.

List of drawings

1 - cylindrical inner channel;

2 - the first layer of ceramic half rings;

3 - the second layer of ceramic half rings;

4 - cylindrical body;

5 - input channel made of heat resistant steel;

6 - water-cooled shirt;

7 - hole for installing a flammable device;

8 - cylindrical outlet channel.

Utility Model Implementation

The refractory channel of the burner device for plasma ignition of the fuel of the burners of the thermal unit contains a cylindrical body made of heat-resistant steel 4, lined on the inside with the first and second layer of ceramic half rings 2 and 3, limiting the cylindrical inner channel 1. At the same time, on the flange of the cylindrical body 4 with bolts and nuts, an inlet channel of heat-resistant steel 5 is installed, containing water-cooled on its location at the location of the hole for installing the ignition device 7 shirt 6. A cylindrical outlet channel 8, lined on the inside with one layer of ceramic half rings 3, limiting the inner channel 1, is a continuation of the cylindrical body 4. As a heat-resistant steel, steel grade 12X18H10T GOST 5632-72 is used. The angle of inclination of the junction surface of the ceramic semirings 2 and 3 is 30 °, which allows you to maintain the integrity of the boundaries of the inner channel when they are displaced due to thermal expansion. In this case, the ceramic half rings 2 and 3 have the same thickness, which is necessary for a more uniform distribution of the thermal stresses arising in them and to prevent their cracking. The selection of the above parameters of ceramic half rings can further improve reliability and increase the service life of the refractory channel of the burner device.

The refractory channel of the burner device is used as follows.

The operation of the burner device is based on ignition of the coal air mixture due to the injection of air heated by low-temperature plasma to 3000-5000 ° C. Low-temperature plasma is obtained in plasma generators - direct current plasmatrons of a two-chamber circuit, in which the compressed gas is the plasma-forming gas.

The ignition device, made in the form of an air plasma torch, is installed on the input channel 5 into the hole for installing the ignition device 7. The air mixture entering the input channel 5 interacts with the plasma stream flowing from the anode-nozzle of the plasma torch. In the interaction of the air mixture with a plasma jet with an average temperature of 3000-5000 ° C, the heating and gasification of coal particles passing through the plasma torch, as well as the partial combustion of the released volatile products and the heating of the entire flow of the air mixture and the walls of the internal channel 1. Water-cooled jacket 6 provides surface cooling input channel 5. In this case, ceramic half rings 2 and 3, limiting the internal channel 1, ensure the integrity of the boundaries of the internal channel 1 and protect the surface of the cylindrical body from High temperature steel 4 in the places with the highest thermal stresses from possible mechanical, thermal, physical and chemical damage and improve its thermal insulation. At the inlet of the mixture flow into the cylindrical outlet channel 8, its temperature is already not so high, and therefore, only one layer of ceramic half rings is installed on the inner side of the outlet channel 8.

Industrial applicability

The patented utility model meets the condition of “industrial applicability”. The essence of the technical solution is disclosed in the formula, description and drawings clearly enough for understanding and industrial implementation by relevant specialists, and the tools used are simple and affordable for industrial implementation in the field of heat power.

Claims (3)

1. The refractory channel of the burner device for plasma ignition of the fuel of the burners of the thermal unit, characterized in that it contains: a cylindrical body made of heat-resistant steel, lined on the inside with two layers of ceramic half rings that bound the inner channel; an inlet channel made of heat-resistant steel mounted on a flange of the aforementioned cylindrical body, comprising a water-cooled jacket fixed to its wall at the location of the hole for installing the ignition device; and a cylindrical outlet channel, which is a continuation of the aforementioned case made of heat-resistant steel and lined on the inside with a single layer of ceramic half rings defining the inner channel. 2. The refractory channel of the burner device for plasma ignition of the fuel of the burners of the thermal unit according to claim 1, characterized in that the bevel angle of the junction of the ceramic half rings is 30 °. 3. The refractory channel of the burner device for plasma ignition of the fuel of the burners of the thermal unit according to claim 1, characterized in that the said two layers of ceramic half rings have the same thickness.

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