The method of preparing a liquid fuel for burning and device for its implementation

 

(57) Abstract:

The invention relates to methods of preparing a water fuel emulsion to burn and can be used in fuel combustion installations, as well as for thermal disposal of liquid wastes containing organic impurities, it provides the minimum energy consumption for fuel preparation for combustion. In the present invention the fuel is mixed with water, the resulting mixture is heated, and then dispersed and mixed with the remaining part of the fuel, and then served on the injector into the combustion chamber. 2 S. p. f-crystals, 2 Il.

The invention relates to methods of preparing a liquid fuel and liquid waste that contains organic matter, burning, and to a device for carrying out the method.

There is a method of preparing a liquid fuel for combustion by mixing it with water and receiving water fuel emulsion.with. USSR N 214948, CL F 23 D 11/16, 1966 ). The drawback of this method is the low quality of mixing and high energy inputs for receiving water fuel emulsion.

There is a method of preparing a liquid fuel for combustion by mixing it with water, which mix the entire volume of water at ratios is 73688, CL F 23 D 11/16, 1985) - the closest analogue. The disadvantage of this method is the high viscosity water fuel emulsion before submitting it to the atomization.

A known heat exchanger pipe in pipe".with. USSR N 397737, CL F 28 d 7/10, F 28 f 1/36, 1971) for viscous liquids containing inner tube, provided with an outer spiral fins, the pipe is made with a varying cross-sectional area decreasing in the direction of movement of the heated medium in the annular space, and the ribs have a height that increases inversely proportional to the step edges in the direction of decreasing cross-section of the outer pipe. The disadvantage of this heat exchanger is not sufficiently high coefficients of heat transfer and efficiency, in addition, when the heating of the medium to high temperature design is not reliable.

Known heater "pipe in pipe with the inner pipe, provided with spiral fins placed with a gap in the outer pipe with fittings for the heated medium, and the gap is made a constant value, 1-6 mm smaller step between the coils fins, along the axis of the inner tube with a gap in relation to it has the heater, and stula is not a high efficiency, as the heated fluid passing directly along the inner surface of the outer tube, is practically not exposed to heating.

The task of the invention is to improve the quality of the formed mixture (emulsion) by reducing its viscosity by increasing the heating efficiency before dispersing.

The problem is solved due to the fact that in the known method of preparation of a fuel for combustion, which consists in mixing a portion of the fuel with the entire volume of water at the ratio of excess K = 1,5 - 2,0, dispersion and connecting the resulting emulsion with the remaining fuel is added to the operation of heating after mixing the water with the fuel, and only after that, the resulting emulsion is served on the dispersant, as well as in the formation of a mixture involving a large percentage of water, the efficiency of heating of the mixture is increased by reducing thermal transmittance (see, for example, C. A. Adams. The combustion of fuel oil in boiler furnaces. - L.: Nauka, 1989), and therefore, the viscosity of the resulting emulsion before the dispersion is significantly reduced, which improves the effect of dispersion.

For the implementation of heating the emulsion obtained by mixing water with the fuel,the second housing at a distance from its inner surface, the enclosure is equipped with a pipe for inlet and outlet of the coolant, the spiral fin heat exchanger is made from a material with longer tubes, the coefficient of linear expansion, and the spiral adjacent to the inner surface of the outer tube of the heat exchanger with a minimum gap, which disappears when heated due to the greater expansion of the material of the spiral, which leads to the decrease of thermal resistance and therefore increase the heat transfer from the pipe surface to the spiral and, ultimately, to improving the efficiency of the heat exchanger.

Thus, the proposed device allows to realize the inventive method, when this is reducing the viscosity of the water fuel emulsion, which is pre-heated before serving disperser.

From the above it follows that when implementing the proposed method and device for its implementation is achieved technical result consists in obtaining water fuel emulsion with low viscosity, which ultimately contributes to its finer atomization in the combustion chamber of the boiler.

The claimed group of inventions to meet the requirement of unity of invention, since the application of the Rel the technical result is fundamentally the same way.

Analysis of analogues and prototypes of the proposed method and device for its implementation showed that the proposed solution is new. The novelty of the proposed method is the use of additional heating operation water fuel emulsion prior to its dispersion. The novelty of the proposed device for the implementation of the proposed method lies in the use of the heat exchanger pipe in pipe", placed within a cylindrical housing and the use of helical fins of the heat exchanger is made of a material with greater than pipes, the coefficient of linear expansion and adjacent to the inner surface of the outer tube with a minimum clearance.

Thus, the claimed technical solution is characterized by a new set of features that provide additional positive effect, and the inventive method and device characteristics match the criterion of "inventive step".

In Fig. 1 is a diagram of the implementation of the proposed method of preparing a liquid fuel for burning. The schema contains the control valve 1, one output of which is connected by a pipeline with a serial circuit consisting of a mixer 2, a heat exchanger 3, dispergation way. The entire amount is added to the water fuel is mixed with part of the fuel flowing after dividing the entire flow fuel valve 1, in a ratio of from 1.5:1 to 2.0:1 in the mixer 2. Received-fuel mixture is heated in the heat exchanger 3, which decreases its viscosity and improves the subsequent dispersion using a dispersant 4. Next, a concentrated emulsion is mixed with the rest of the fuel mixer 5, providing better mixing and heating the whole mixture, and then the emulsion is fed to the nozzles (in the furnace) on combustion, thus providing a more efficient dispersion of the emulsion with minimum energy cost, because the direct intense heat is subjected to only a portion of the fuel.

In Fig. 2 shows a device for implementing the proposed method. The device includes a heat exchanger type 1 "pipe in pipe", placed within a cylindrical housing 2 with a gap from the inner surface. The case is equipped with nozzles for supplying 3 and outlet 4 of the coolant. On the inner pipe 5 is wound helical fin 6 made of a material with a larger than the pipe, the coefficient of linear expansion, it is adjacent to the inner surface of unisource 9 and 10 feed exit of the heated fuel mixture (emulsion). As the heat can be used for steam, hot water, and does not exclude the application instead of thermal fluid heaters. (In this case, the cavity between the inner and outer tubes of the heat exchanger is filled with oil.)

The device for realization of the proposed method works as follows. The heated mixture (emulsion) is supplied through the pipe 9, which is moved along the channel formed by the coil 6 and the walls of the pipes 1 and 5. The heated mixture is discharged through pipe 10 at disperser 4 (Fig. 1), significantly increasing the dispersion. Heat pipes 5 is the flow of coolant through the pipe 7 and the exhaust through the pipe 8 into the condensate collector (Fig. 1 and 2 is not shown). Heat exchanger placed in the housing 2, is produced by the flow of fluid through the pipe 3 and the outlet through the pipe 4 in the same collection of condensate.

The inventive method and device are capable of industrial application, as include the type (and.with. USSR N 1273688), supplemented feasible operation pre-heating of the emulsion before dispersing, and used the device on and.with. With the device operating principle, provide a new set of essential features that allow for the highest quality education water fuel emulsion, which ultimately allows us to provide the best burning with minimal energy costs.

1. The method of preparing a liquid fuel for combustion by mixing with water and receiving water fuel emulsion, in which mix the entire volume of water at the ratio of excess K = 1,5-2,0 with part of the fuel, the mixture (emulsion) served on the disperser and then to the second mixer, which also served the remaining fuel, characterized in that after mixing the water with the fuel mixture (emulsion) is heated, and then served on the dispersant.

2. The device for implementing the method according to p. 1 containing the heat exchanger pipe, wherein the heat exchanger is placed in a cylindrical housing with a gap from the inner surfaces of the housing is equipped with nozzles for inlet and outlet of the coolant, the spiral fins made of a material with a larger than the pipe, the coefficient of linear expansion, and the spiral adjacent to the inner surface of the outer tube of the heat exchanger with a minimum clearance.

 

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EFFECT: invention provides for high extent of fuel preparation in the inner cavity of a nozzle due to increased time of fuel stay in the area of its reaction with a sprayer, intense grinding of fuel drops with supersonic sprayer jets, which are flowing from channels.

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EFFECT: invention reduces NOx emission from burning of the main flame.

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EFFECT: provision of simple design with a more efficient spraying of liquid fuel in the pre-mixing channel for reducing emissions along with optimal use of the air curtain.

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FIELD: baking industry.

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