Electric heating device

FIELD: domestic facilities.

SUBSTANCE: invention relates to combined heat and power supply plant for household use. Proposed domestic combined heat and power plant contains Stirling engine and water heater. Stirling engine is installed for heating by first burner supplied with fuel gas. Plant contains additionally intake gas duct passing from Stirling engine in contact with fuel gas intake in first burner preliminary heating of fuel gas delivered into first burner and then heating of water which is subsequently heated by water heater. Water heater is provided with second burner. Plant is designed so that outlet gas and gas from second burner form combined flow immediately after heating of water, and combined flow for heating of water is located higher from outlet gas relative to flow. Plant contains additionally cooler of Stirling engine arranged for heating water higher than outlet gas relative to direction of flow.

EFFECT: provision of effective heating of water, reduced cost of heating and provision of compact device.

2 cl, 4 dwg

 

The present invention relates to a heating electrostrictive. In particular, the invention relates to a domestic combined heat and power plant ((DCHP)(reporting).

Have been proposed such BEAUTE-installation, which include the Stirling engine connected to an AC generator to generate electricity. The heat generated by the Stirling engine, which in other cases shall be discharged, is used for heating water supply domestic hot water and Central heating system, and therefore becomes a valuable product BEAUTE-installation. It was shown that the most favorable economic indicators for BEAUTE-install achieved when the Stirling engine/alternator set size to generate approximately 1 kW of electricity. At this level, however, will be achieved only approximately 5 kW of heat, which is significantly lower than normal domestic heat load in excess of 20 kW.

In order to make the rest of warmth, so BEAUTE-set to compete effectively with modern technical characteristics household steam boiler, an additional gas burner. The present invention aims to provide a thermally efficient operation of the Stirling engine and the additional the additional burner.

According to the present invention provides for domestic combined heat and power plant, containing the Stirling engine and the heater, in which the Stirling engine is used for heating the first burner fueled by a combustible gas, and the installation further comprises an exhaust gas duct passing from the Stirling engine in contact with the intake of combustible gas to the first burner with pre-heating of fuel gas supplied to the first burner, and then hot water, which is additionally heated by the heater, where the water heater is equipped with a second burner, and where the plant is designed so that the exiting gas and the gas from the second burner to form the combined stream immediately after they give heat the water, and the combined stream is placed to heat the water upstream from the outgoing gas.

Thus, the heat from the original release is regenerated in a member of burner air / gas mixture that has the effect of reducing combustible fuel and increase the temperature of combustion, which increases the rate of heat transfer to the Stirling engine and therefore improves the efficiency of the installation. Specified escaping gas, now cooled to some extent, is then used to heat water, which is heated by the additional heater, so when IgA the supply of heat, required from the additional heater.

Moreover, the water will get warm relatively low grades from the combined stream, as components of the combined stream is already given part of the heat water. Water then will then get the warmth of a relatively high grade directly from the output gas from the additional burner. This design is thermally efficient.

Preferably, the installation further comprises a cooler Stirling engine designed to heat water upstream from the heat leaving gas. This not only serves to provide water heating, but also helps to maintain the desired temperature difference in the Stirling engine.

Gases of the burner, the heating head part of the Stirling engine, are usually at a temperature of about 1400°C. Because the gases go around the head part, the heat is transferred to the head of the heater, and the temperature of the gases drops to approximately 800°C. Gases transfer heat to the incoming fuel-air mixture. If there is no additional heat recovery, exhaust gases going into the tube Stirling engine, then usually have a temperature of about 600°C.

The present invention also relates to a new design of the heating device to transfer heat to water. The requirements is that it dollars is but to be compact and capable of transferring heat from, at least two threads to the water with maximum efficiency.

According to another aspect of the present invention provides a heating device for heating a fluid medium, and the device comprises: a housing; a pipe in the casing to its outer periphery and spiral wrapped around the Central axis of the housing for transporting the fluid from the first end of the housing to the second end of the housing; an additional burner in the housing adjacent to the second end and is surrounded by a pipe to transfer heat to the fluid in the first part of the pipeline; the release of hot gas from an external source of heat, and the inlet is made with the configuration for directing hot gas radially outward to the second part of the pipeline closer to the first end of the housing than the first part of the pipeline.

Such a device is particularly compact, as an extra burner and the inlet for gas from an external source are in the pipeline through which the transported fluid. In addition, an extra burner and the inlet is placed to transfer heat to different parts of the spiral pipe. Thus, the device can be made to be very thermally efficient.

Preferably the inlet is located with the opportunity essentially, predotvraschenie gas from the secondary burner and hot gas from an external source of heat, at least, until both pass through the spiral wound pipe. Thus, flows essentially prevented from mixing to achieve a pipeline with a more efficient heat transfer.

As soon as the exiting gas and the hot gas from an external source to pass through the spiral wound tubing, they can be then simply reset either separately or as a combined stream. However, preferably two streams to form a combined stream immediately after they first give some of the heat pipe, and the combined stream passes around the third part of the pipeline closer to the first end than the second part of the pipeline. Thus, the cold fluid in a spiral wound pipe, which enters the first end of the housing, first faced with the specified relatively cold joint flow and preheated data stream to heat the gas from an external source of heat and gas from the secondary burner.

Although some mixing of gas from the secondary burner and hot gas from the external heat source is valid, because a small amount of the mixture has a relatively small impact on the overall heating of the fluid medium, it is preferable to minimize such confusion as much as possible. So suppose the equipment provides sealing to prevent the mixing of gas from the secondary burner and hot gas from an external source of heat radially inside of the pipeline.

In order to maximize heat transfer to the pipeline, the pipeline is preferably set so that each stage of the pipeline is flat in the direction of the Central axis, so that in the cross section of its radial dimension is greater than its axial dimension. Also preferably adjacent coils of pipe are located closely adjacent or against each other. This ensures that the hot gas passes through a relatively long and narrow passage between adjacent coils of the pipeline, which makes effective heat transfer. This pipeline design is specified in WO 94/16272.

An example of the invention is now described with reference to the accompanying drawings, on which:

figure 1 presents the scheme of the first installation with the Stirling engine;

figure 2 presents the scheme of the second unit with Stirling engine;

figure 3 presents the cross-section of the heating device; and

4 shows end view of the device with 3.

The device shown in figure 1, contains the Stirling engine 1, to which heat is supplied by the burner 14. Heat is transferred to the head part by a system of ribs 3, as considered in the early concurrently pending application authors No. 0020012, and out through the flue.

The device in figure 1 has a heater 15, which is designed to heat water p the current 16 with additional burners 17. Escaping gases are removed through the flue 18.

A common gas supply line 19 is provided for the first burner 14 and the secondary burner 17. Specified gas flow is regulated by one multifunctional valve 20. Burner regulates adjustable ignition and flame detection burner can be entered in the multifunction controller. The gas in the multifunctional valve 20 enters the mixing chamber in the form of a Venturi 21 and is mixed with the air stream 22 which is supplied by a fan.

The mixture of gas and air is now fed to the control valve 23, in which a single inlet 24 leads to the release of the first burner 25 and the release of the second burner 26. The relative amount of flow to each release is regulated by a hinged valve 27, which rotates around the axis 28. The position of the hinged valve 27 is set by the controller installation and is provided at a specified position, for example, a servo motor. Alternative air flow can be divided only after the suction fan 60 such valve 23, and then each of the air flow can be entered in the multifunction valve/controller with accurate dosage of the gas mixture for each burner. This design is shown in figure 2.

The air-fuel mixture supplied to the Stirling engine 1 flows around the fairing 29, closing the burner, and therefore heats the hot gas stream leaving the burner. Escaping gas, which gave part of its heat to the incoming mixture, out of the fairing through the pipe 30 and flows into the heater 15, where it comes into contact with the water flow 16 (which has already been heated to some extent in the cooler Stirling engine 31) so as to pre-heat water flow 16 upstream from the secondary burner 17. Additional burner 17 is lit for additional heating of the water stream 16, if required. Escaping gas from the first burner 14 out of the heater 15 with the output gas from the supplementary burner 17 through the duct 18.

The heating device shown in more detail in figure 3 and 4 and contains an additional burner 17 and the heater 15. The heater 15 has a generally cylindrical body 39 with the main axis 40. Additional burner 17 is located on the axis 40 so that the flame moves radially outward.

Water is fed through the heater 15 on the right side (figure 3) to the left side of the water supply 41, which is a single spiral pipe (which can be made from a number of connected segments), is wound around the axis 40, to the outer periphery of the cylindrical body 39. Every single stage of the pipeline 41 is flat in the axial is upravlenii. Adjacent coils are close to each other, but not welded together, so that the hot gas can pass between adjacent coils. By the middle of the water heater 15 departs inlet 42 on the exit gas from the Stirling engine. The inlet leads into a round chamber 43 formed between the circular plates 44, 45, the latter of which is a hole for the inlet 42. Ring pendants 46 overlap the gap between the edge of the plates 44, 45 and water supply 41 to ensure that all outgoing gas from the chamber 43 passes through the coils of water 41. With respect to the second end of the camera 43 is Luggage additional burners 47, in which there is an additional burner 17. Additional burner heats the adjacent coils with the second end.

With respect to the first end from the camera 43 is unloading chamber 48 with the release of 49. There is also the issue of 50 for condensate obtained due to the nature of the high efficiency of this end-stage heat recovery.

The work of the heater 15 is as follows. Water flows through the water pipe 41 from the first end to the second end around the spiral passage. Additional burner 17 is lit in the chamber 47, and the escaping gas is fed to the input 42 and passes into the chamber 43. These two hot flow passing radially through the gaps between adjacent coils in the water 41 in the outer ring of the second camera 51 and form a combined stream. This combined stream then flows back through the water 41 adjacent to the first end, as indicated by the arrow 52. The incoming water so first heated specified combined stream. As it flows to the second end, she meets the exit gas of the Stirling engine from the chamber 43 and additionally heated. Finally, she meets the hot gas from the secondary burner 17 to provide a third stage of heating.

The specified three-stage heating device ensures efficient water heating. In addition, as can be seen in figure 2, the device, which provides a specified three-stage heating, is particularly compact, which saves cost and space.

1. Domestic combined heat and power plant, containing the Stirling engine and the heater, in which the Stirling engine is to heat up the first burner fueled by a combustible gas, and the installation further comprises an exhaust gas duct passing from the Stirling engine in contact with the inlet of the fuel gas to the first burner for preheating the fuel gas supplied to the first burner, and then heat water, which is then heated by the heater, where the water heater is provided with a second burner and where the installation is designed, Thu the escaping gas and the gas from the second burner to form the combined stream immediately after as they give up their heat to the water, and the combined stream to heat water is located upstream from the outgoing gas.

2. Installation according to claim 1, additionally containing cooler Stirling engine located for heating the water upstream from the heat coming out of the gas.



 

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