RU2593326C1 - Direct action heat generator - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention relates to heating devices using heat from combustion of fuel, particularly, to a dryer of solid materials or articles by removal of moisture, and can be used in dryers for grain, small-seeded crops, etc. Direct action heat generator includes a hole for air intake from an air channel of the heat-ventilation system of the drier, an air duct, a swirler, a combustion chamber, a high-pressure fuel pump, a pintle nozzle. According to the invention, intake of air for supply to the combustion chamber is performed from the zone of heat exchange between the surface of the combustion chamber and the fresh air flow through a sleeve installed in the section of output of flue gases from the combustion chamber. Selection and control of fresh heated air supply is realised with the help of a rotary truncated hemispherical gate installed in the sleeve.

EFFECT: invention shall provide higher thermal efficiency and operational reliability of a heat generator.

1 cl, 4 dwg

Description

The invention relates to heating devices using the heat from the combustion of fuel, in particular to drying solid materials or objects by removing moisture from them, and can be used in dryers of grain, small seed crops, etc.

Known modernized heat generator TG-1,5, containing a nozzle, heat generator, fuel pump, welded frame, electric motor, tank, filters for coarse and fine fuel cleaning, two-row chain transmission with a tension mechanism, swirl [Volkhonov MS, Smirnov I.A. ., Shorokhov N.A. Economic heat generator for grain dryer // Rural machine operator. - 2014. - No. 4. - 40 p., P. 28-29].

The disadvantage of this device is the inability to control the air supply to the furnace, proportional to the amount of fuel supplied, while the fuel combustion process deteriorates due to the supply of cold fresh air to the combustion chamber, the efficiency of the furnace decreases, and the time for heating it increases.

The closest adopted for the prototype is a heat generator, consisting of an opening for air intake from the air drip of the fan heater system, air ducts, fan, swirl, combustion chamber, high pressure fuel pump, high pressure fuel pipe, pin nozzle [Volkhonov M.S. Smirnov I.A., Gabalov S.L., Sokolinsky R.V., Volkhonov PM Improving the design of a heat generator using liquid fuel // Actual problems of science in the agricultural sector: a collection of articles of the 66th international scientific and practical conference in three volumes. Volume 2. - 2014 .-- 221 p., P. 80-85].

A disadvantage of the design of the specified heat generator is that a separate fan is used to supply air to the combustion chamber, which leads to an increase in the cost of the heat generator, an increase in energy consumption for the process, and a complication of the technical scheme. The intake of heated air is not carried out at the place of its maximum heating, which leads to a deterioration of the mixture formation, the combustion process and a decrease in the thermal efficiency of the furnace.

The technical task of the claimed invention is to improve the design, increase thermal efficiency and operational reliability of the heat generator.

The problem is solved in that in the direct-acting heat generator, including a hole for air intake from the air channel of the dryer heat ventilation system, an air duct, a swirl, a combustion chamber, a high pressure fuel pump, a pin nozzle, according to the invention, air is taken from the zone heat exchange between the surface of the combustion chamber and fresh air flow through a pipe installed in the cross section of the exit of flue gases from the combustion chamber.

The selection and regulation of the supply of fresh heated air is carried out by a rotary truncated hemispherical damper installed in the pipe.

The proposed design of a direct-acting heat generator due to the distinguishing features provides a solution to the problem of improving the design of the heat generator, increasing thermal efficiency and its operational reliability.

The claimed invention is illustrated by figures 1-4.

In FIG. 1 shows a diagram of a direct-acting heat generator.

In FIG. 2 - pipe with a rotary truncated hemispherical shutter. Open position.

In FIG. 3 shows a pipe with a rotary truncated hemispherical shutter in the closed position.

In FIG. 4 is an isometric view of a rotary truncated hemispherical shutter in a nozzle.

Direct-acting heat generator consists of an air intake hole 3, a nozzle 4, a rotary truncated hemispherical damper 5, an air duct 6, a swirler 7, a combustion chamber 10. A nozzle 8, a high pressure fuel pump 1, a high pressure fuel pipe 2 are used as fuel supply equipment. spark gap 9 is used for electric ignition of fuel. The whole structure can be installed in the air channel of the heat ventilation system 11 of the dryer [Fig. one].

Rotary truncated hemispherical damper consists of a shaft 2 and a truncated hemispherical damper 3 mounted in the pipe 1 [Fig. 2, FIG. 3].

Direct-acting heat generator operates as follows. The high pressure fuel pump 1 injects fuel through the fuel line 2 into a pin nozzle 8 installed in the combustion chamber 10. The combustion chamber 10 is installed inside the air channel 11 of the dryer, which ensures the least heat loss. The air intake hole 3 is located in the heat exchange zone between the surface of the combustion chamber and the fresh air stream to select the most warmed fresh air. Air intake is carried out through a pipe 4 with a rotary truncated hemispherical damper 5, installed in the cross section of the flue gas outlet from the combustion chamber 10. Using the rotary truncated hemispherical damper 5, the most warmed fresh air is taken directly from the air channel 11 of the dryer heating system. The warmest fresh air enters the combustion chamber 10, passing through the duct 6 and swirl 7 [Fig. one].

The selection and regulation of the supply of fresh heated air is carried out by turning the shaft 2 of the truncated hemispherical damper 3 [Fig. 2, FIG. 3]. The hemispherical shutter 3 is truncated by 0.3 ... 0.5 of the radius of the sphere, which ensures the supply of a sufficient amount of heated fresh air to start burning fuel in the closed position of the shutter [Fig. 2]. The truncated hemispherical damper 3 has a rotation angle range from 0 ° to 90 °, while the air sampling cross section is changed, thereby supplying the required amount of the most heated fresh air to supply it to the combustion chamber from the general air flow directed to the drying chamber, with the smallest hydraulic resistance without the use of an additional fan [Fig. 3]. The fuel is atomized in the form of a misty cloud in the combustion chamber and mixes well with the incoming warmed-up fresh air, which leads to its complete combustion.

This design of a direct-acting heat generator provides improved design of the heat generator, increasing thermal efficiency and its operational reliability.

Claims (2)

1. Direct-action heat generator, including a hole for air intake from the air channel of the dryer heat ventilation system, air duct, swirl, combustion chamber, high pressure fuel pump, pin nozzle, characterized in that the air is taken from the heat exchange zone between the surface for air supply to the combustion chamber combustion chamber and fresh air flow through a pipe installed in the flue gas outlet cross section from the combustion chamber. 2. Direct-action heat generator according to claim 1, characterized in that the selection and regulation of the supply of fresh heated air is carried out by a rotary truncated hemispherical damper installed in the pipe.

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