The article is devoted to the study of thermal processes occurring during the operation of a household gas burner. The preparation of gas fuel for combustion is one of the important functions that a gas burner performs. At the same time, when designing gas burner devices, it is important to determine the final temperature of the gas-air mixture inside the burner body, since an increase in the temperature of the resulting mixture makes it possible to intensify the combustion process. We have proposed a solution that allows to intensify the transfer of heat in the body of a gas burner from the lid heated due to contact with the flame to the gas flow using the thermal shape of the conical divider installed in the center on the inner side of the lid. It has been established that the location of the heat divider in the center on the inner side of the cover allows minimizing or completely eliminating the formation of a stagnant zone. The conical shape of the heat divider provides less resistance to the oncoming flow movement, and also because of its own side surface, it allows you to increase the useful area of the heat exchange surface. An expression is obtained for determining the final temperature of the gas-air mixture at the outlet from the firing holes of the burner body.

No abstract

The relevance of the work of information and diagnostic systems in the field of monitoring of plate heat exchange equipment is considered. The reliability of the monitoring devices requires an accurate mathematical description of the thermo hydrodynamic processes in the heat exchange channels. The classical description of these processes implies a uniform distribution of the flow rate of the working medium along the length of the plate package, which in turn implies equal conditions for the formation of salt deposition products on the heating surfaces of the plate heat exchanger. The use of dependencies that take into account the equality of costs for a package of plates reduces the reliability of diagnostics of the efficiency of hot water devices of the plate type. Since the geometric space formed by the plates is represented by parallel channels connected by sections of transit collectors, the method of resistance characteristics is proposed as a method of hydraulic calculation of the distribution features of liquid flows through heat exchange channels. The dependence of the design features of the location of the interplate channels relative to the input of the coolant into the distribution manifold is revealed. It is found that, the flow rate of the circulating coolant is less in the channels most remote from the inlet pipe than in the nearest channels. The hypothesis of the influence of the relative position of the channels in relation to the inlet pipe is confirmed by numerical studies of the hydrodynamic regime of the plate heat exchanger.

The article is devoted to the development of the design of a low-pressure injection burner equipped with a thermal divider and the study of the process of distribution of methane concentration and velocity of gas-air mixture velocity in the burner body. The Solid Works Flow Simulation software complex is used to study the process of formation of the gas-air medium in the burner body. The design of a low pressure injection burner with a conical-shaped heat spreader has been developed. Placing the divider in the burner body provides preheating of the gas-air mixture and allows to increase the speed of flame propagation. Computer simulation of the process of gas-air mixture formation in the burner body for 3 burner constructions is performed: without a divider, with a divider length of 11 mm and a divider length of 25,5 mm. As a result of modeling, it is found that the placement of the divider with a length of L = 11 mm does not affect the distribution of methane and the velocity of the gas-air mixture in the burner body and at the exit of the firing holes. Increasing the length of the divider to 25,5 mm leads to an increase in the speed of the gas-air mixture and an increase in the concentration of methane in the firing holes. Therefore, the placement of the burner housing to the heat spreader with a length of 11 mm is the best solution to improve the efficiency and stability of the combustion process.

Purpose of research. With the increase of population and number of megacities, the consumption of various goods increases and the waste of which eventually turns into garbage. The growing amount of all kinds of waste every year and their negative impact on the environment is a global problem. However, with all existing methods of waste disposal, the least environmentally friendly method of waste disposal is used in our country - disposal by means of burial ground disposal at solid waste landfills. Landfills of solid waste are a source of landfill gas, the uncontrolled emissions of which have a negative impact on the environment. At the same time, the properties of landfill gas make it possible to use it as an energy source. The analysis of the problems рфму showт the relevance of the direction of using landfill gas as an alternative type of gas fuel, as well as the development of devices for its efficient combustion.Methods. The article discusses the impact of solid domestic waste (MSW) on the Earth's biosphere. The analysis of the global problem of waste disposal is carried out, solutions are considered. Based on the methodology specified in GOST 33998-2016 “Gas household appliances for cooking. General technical requirements, test methods and rational use of energy ”, we have carried out a study of the efficiency of the landfill gas combustion process in the developed design of a gas burner device equipped with a thermal splitter.Results. On the basis of experimental studies for a gas burner device of the developed design, the values of efficiency,% of the burner and the content of carbon monoxide (CO, mg / m3) in the combustion products have been obtained, depending on the length of the thermal divider.Conclusion. The results of experimental studies have shown the high efficiency of the original gas burner device when burning landfill gas.