| JP2002310594 | HEAT EXCHANGER WITH HEAT EXCHANGER TUBE |
| JPH0727400 | [Name of invention] Engine intake heating device |
| JP4041984 | Micro Combustor |
| WO2005100861A1 | 2005-10-27 |
| DE4329425A1 | 1995-03-02 | |||
| GB2279735A | 1995-01-11 | |||
| FR931487A | 1948-02-24 | |||
| GB2118707A | 1983-11-02 | |||
| DE9405748U1 | 1994-09-01 |
| PROTECTION DEMANDS
1. The combustion space of a boiler with air supply pre-heating, containing a burner and a reflector, characterized by the fact, that the reflector (1), made of fire-resistant material with thermal resistance higher than 700° C 5 is fitted with through ducts (2), the inputs of which (6) are connected to the inlet (4) of combustion air and outputs (5)- are lead to the combustion space (10).
2. The combustion space of a boiler with air supply pre-heating according to the demand no. 1, characterized by the fact, that the reflector (1) contains a bottom part (7) and an attached upper part (8), while on the inner surface of the bottom part (7) and /or the upper part (8) a cutout (3) is made; it forms, between the upper part (8) and the bottom part (7) of the reflector (1), closed space over 1 sq cm in diameter into which the inlet (6) of the combustion air supply (4) is lead, while on the bottom part (7) of the reflector (1), at least 1 output is implemented (5); if there are more outputs they can be evenly placed around the cutout circuit (3).
3. The boiler combustion space corresponding to the demand no.1, or demands 1 and 2, characterized by the fact, that the reflector (1) is made of ceramics that is resistant to the temperature of 1500° C and resistant to compression of at least 50 MPa. |
Boiler combustion space fitted with Ceramic Reflectors and Air Distribution Pipes.
Technical field
The Patent applied for concerns pre-heating of the air supply within a solid fuel boiler for the purposes of improving the combustion of solid fuels.
Technical state so far
Up to now boilers, or more precisely their combustion space, have had no air supply preheated or the pre-heating has been realized through the air passage around hot parts of the boiler. A disadvantage of such s olutions is the insufficient pre-heating of air supply, because the air supply heats up to an insufficient temperature or is essentially cold air prior to entry to the boiler chamber. The pre-heating of air may also be realized by an external source of heat, which is efficient with large boilers only.
Principle of the technical solution
The problems listed above can be to a great extent removed by a boiler combustion space with air supply pre-heating based on the following model (A) a burner with reflector ceramic panels, the substance of which rests in the fact that the reflector, made of fire-resistant material with thermal resistance higher than 700° C, is fitted with through putted air ducts. The through putted air supply ducts are connected to the combustion air inlet. The ducts air supply lead up to the combustion space. The principle of this model hinges on the reflector containing a bottom part reflector to which an upper part is attached. On the inner surface of the bottom part and/or the upper part a cutout is made, which creates, between the bottom and the upper part of the reflector, closed space over 1 squared cm in diameter. To the ring area, the combustion air supply inlet is connected. On the bottom part of the reflector, there is at least 1 output implemented. If there are more outputs than just 1, they are placed around the cutout circuit. One of the most important parts is that the ceramics used are resistant to temperatures of 1500° C and resistant to compression of at least 50 MPa.
The advantage of the boiler combustion space with pre heated air supply is that a high amount of air can be heated and reflected back down onto the fuel to be combusted, while ensuring that the costs of doing so are low.
The summary of the illustrations in the plans
The product patent applied for is specified in the illustration, where the picture no. 1 illustrates an overview of the boiler combustion space with air supply pre-heating based on this new product. Picture no. 2 illustrates a schematic detail of the boiler reflectors corresponding to the technical solution.
Examples of the technical solution implementation
The e xisting w ooden p ellet b urning b oiler w ith an ominal o utput o f 25 IcW k nown i n Europe under names BENEKOV PL 27, BENEKOV pelling 27 or Benekov Prime 25 was not fitted with an air supply pre-heating. In order to increase its effectivness and significantly reduce dust emmisions in flue gases, it was decided it should be fitted with apre heated air supply. Therefore, the boiler combustion space containing a burner 12 was furnished with a reflector i, made of refractory concrete that is able to resist a temperature of 1500° C. Compression resistance of the refractory concrete used is 70 MPa.
The reflector 1 is fitted with through ducts 2 that are 12 mm in diameter, the outputs of which 5 lead to the combustion space I 1 O, i.e. to the space where the combustible flames. Inputs 6 of the through ducts 2 are connected to the combustion air inlet 4 that is formed of a pipe % 57 mm in diameter, connected to the output side of the ventilator 11_.
The reflector 1 consists of a bottom part 7 and an upper part S. Inner surface of the bottom part 7 is fitted with a circular ring-shaped cutout 3, forming closed ring-shaped space with square profile 30 x 10 mm between the upper part 8 and the bottom part 7 of the reflector h Into the ring-shaped space, the inlet 6 of combustion air supply 4 is connected. In the bottom part 7 of the reflector L 1 12 outputs 5_ are implemented, evenly placed aroud the cutout circuit 3.
The air inflow is pressed through the fan via feed pipes 9 of combustion air supply 4 and a certain part of the air is lead via ducts 2 of the reflector I. By that, the highly heated extra supply air gets into the combustion space 10, which has a positive result on the boiler combustion efficiency and reduction of dust emmisions in flue gases.
Industrial applicability
The technical solution can be used with boiler implementation, especially solid fuel boilers with a capacity of up to 100 kW; it has a positive effect on the increase of efficiency while using a simple and cheap solution. This solution allows burning of energy grain with the dust emmisions in flue gases below 90 mg/m 3 . The solution is particularly suitable for boilers burning biomass pellets, woodchips grain and assorted coal.