Lately in power industry most application was got by garotrubnie vodogreynie caldrons. They find wide application in district, factory and communally – domestic heating boiler rooms, coming on the change to the cast-iron vodogreynim caldrons. Make them for heating of water to 100 – 110 0Ñ at pressure, rarely exceeding 0,2 Mpa. These caldrons have small on a height flues (8 – 12 m) and insignificant volumes of products of combustion.
In garotrubnih caldrons the gas burns in heating, and then smoke gases pass by system of the pipes submerged in the heated water and the incorporated general corps.
The high temperature of leaving gases is the lacks of these caldrons, progar back wall of caldron, peregog pipes of gazotrubnogo bunch in the place of fastening of them in the pipe grate of turning chamber. The Peregog pipes is possible from the high temperature of gases on an exit from a turning chamber (1200 – 1300 0Ñ), promoted by a volume and superficial teplovideleniya in a turning chamber, and also from low quality of preparation of nourishing water, that worsens taking of warmth from pipes and pipe grate. That evading it is necessary either high-quality to purge water from admixtures, or to avoid their deposit due to the exception of boiling on the surface of caldron.In garotrubnih caldrons the twowire gas-rings of the partial or uncompleted predvaritelgogo mixing of gas and air are usually set with the forced serve of air.
To the lacks of gas-rings the given type is taken: and) presence of locomotive parts, reliability of work of which can be broken at their heating from the thermal radiation of heating; b) the limited range of possible change of thermal power; in) complication of making; g) sharp increase of sizes with growth of thermal power; d) considerable expenditures of elekroenergii on dutevie ventilators; e) absence of optimum terms for normal interfusion of gas and air, which is closed in heating of caldron aggregate, what flame has because of considerably large length.
By dignities of gas-rings with the uncompleted mixing, besides unlimited productivity, are possibility of creation of torch of necessary length, configurations and danger of proskoka of flame even at the very wide limits of adjusting and their small sizes. The Progar back wall of pipe arises up from development of the long flame conditioned by bad interfusion of gas with air, which entails the losses with chemical nedogegom. These losses multiply the temperature of leaving gases, the same lowering KPD of caldron and multiplying the expense of fuel, that is unacceptable.
In the considered gas-rings the character of gas torch is determined by the basic role of gas-ring as the smeseobrazovatelya set intensity. At the partial preliminary mixing of gas with air in a gas-ring, burning of torch takes place not on an external flaming shell. Burning by mikrodiffuzii takes place on all section of torch with approximately equal intensity (as far as formation of air-gas) on the surface of the crushed gas particles surrounded by air. Characteristic for a torch process there is that elementary volumes of gas, getting in the most unfavorable terms, and determine in the end length of torch and necessary for the complete burning down of gas of the nabariti heating.For acceleration of process of mixing gas more frequent than all is given through the row of cracks or opening the axes of which are directed under a corner to the blast. Experiments showed that such process was indeed characterized by the promoted intensity of mixing, by considerable stability of burning at the wide limits of change of coefficient of surplus of air.
Table 1 - Computation of structural parameters of gas-ring
| The Name parameter | The Variant 1 | The Variant 2 | The Variant 3 |
| Diameter of nozzle, mm | 7 | 10 | 13 |
| Speed of gazovozdushnoy mixture, m/s | 44,9 | 34,5 | 26,6 |
| Speed of air, m/s | 11,06 | 11,06 | 11,06 |
| Distance between axes, mm | 16,63 | 33,94 | 57,36 |
| Area of transversal section of nozzle, m2 | 0,0141 | 0,00691 | 0,0041 |
| Quantity of tape-holes, sht. | 16 | 8 | 5 |
| Length of torch, mm | 1717 | 2453 | 3188 |
The most optimum variant – it is a variant 1, which has the parameters presented in the table 2.
The Table 2
| The name of parameter | The Variant 1 |
| Diameter of nozzle, mm | 7 |
| Speed of gazovozdushnoy mixture, m/s | 44,9 |
| Speed of air, m/s | 11,06 |
| Distance between axes, mm | 16,63 |
| Area of transversal section of nozzle, m2 | 0,0141 |
| Quantity of tape-holes, sht. | 16 |
| Length of torch, mm | 1717 |
Introduction of the given gas-ring allows to lower chemical nedogeg the harmful troop landing of nitrogen.