Cata chimney spare parts. At the end of the chimney, a flue-gas-purifying material, such as lime or a combination of lime and gypsum is added to the flue gas stream. The purifying agent reacts with the soot and other impurities in the flue gas stream and the flue gas thus becomes clean.
During construction of a chimney, as well as the initial heating and cooling of the flue gas stream, a great quantity of the soot falls from the top of the chimney in a continuous flow to the lowest height of the flue. In the chimney, this soot is concentrated in a particular volume of flue gas, which increases in size in proportion to the flue height.
The soot which falls down the chimney consists of very fine particles having a diameter of less than 0.1 mm, and can easily get blocked inside the chimney. In other words, the soot particles agglomerate and block off the chimney. In a chimney which has a flue height of 300 m, more than 12 cubic meters of soot is accumulated inside the chimney, so that the build-up of soot therein results in the blocking of at least 50% of the cross-section of the chimney.
When a chimney with a soot blocking, i.e. a chimney with a blocked soot duct, is first heated, the soot begins to burn immediately, whereby a chimney is formed in the region of the soot block. The chimney is used to draw in additional flue gas, i.e. gas is introduced into the chimney from below. However, this is not possible if the chimney is blocked with soot.
In order to unblock the chimney, the flue gas is evacuated and a soot-cleaning device, which, depending on the type of cleaning device, e.g. a fan or a water spray, is provided in order to carry out the soot cleaning. A chimney which is blocked with soot cannot be used agn until the soot has been removed from the chimney. This means that not only the chimney but also the entire heating installation, such as a heating plant, must be taken out of service during the soot cleaning process.
A further problem with the soot burning during the soot cleaning is that the flue gas, which can no longer be used to heat the space heated by the heating installation, is discharged from the flue of the heating installation and pollutes the atmosphere. Moreover, this also requires the purchase of a cleaning device.
Furthermore, the soot cleaning is accompanied by the formation of ashes. The amount of dust which is removed from the chimney is small and, therefore, the amount of dust that is recycled back into the combustion r by way of the cleaning device is only a small proportion of the amount of dust that is combusted.
Accordingly, the object of the present invention is to provide a method for cleaning a flue gas duct of a combustion installation of a heating installation which is reliable and efficient. Furthermore, the amount of dust should be reduced to a minimum. Furthermore, the cleaning process is to be carried out with a minimal amount of energy. The removal of the soot should also be carried out without the flue gas being contaminated with dirt. Furthermore, the flue gas duct should not have to be taken out of service for a long period.
According to the present invention, the object is achieved in that a soot-cleaning device, which may be configured as a soot-cleaning fan or a water spray, is coupled to the flue gas duct. It is further proposed that the flue gas is blown or directed by the soot-cleaning device in the direction of a condensation duct into which the flue gas condenses.
The present invention is based on the concept of cooling the flue gas. In accordance with the present invention, the flue gas duct of a combustion installation is cleaned by a soot-cleaning device which blows or directs the flue gas in the direction of a condensation duct. The flue gas then condenses in the condensation duct. A condensate which contns soot is sucked out of the condensation duct and is transferred to a water-collecting reservoir. In accordance with the present invention, it is preferred for the soot-cleaning device to be a fan, a blower or an r nozzle.
The amount of soot that can be removed from the flue gas duct depends on the flow speed. In accordance with the present invention, the flow speed of the flue gas is increased by the use of a fan, a blower or an r nozzle. By means of the r nozzle, a jet can be blown through the flue gas duct and this jet causes a corresponding circulation of the flue gas in the flue gas duct. The velocity with which the flue gas passes through the condensation duct can be set by the speed of the fan or blower or by the diameter of the nozzle.
The flue gas duct is preferably cleaned with respect to the soot by a process of blowing, directing and condensing. The soot-cleaning process starts with an initial cleaning of the flue gas duct by a process in which the soot in the flue gas duct is swept off with a sweeping agent or is removed by a water spray. If the duct is substantially blocked by soot, the soot can be completely removed from the duct.
A water spray is preferably used for cleaning the flue gas duct. In this way, the soot can be completely removed from the flue gas duct, or at least can be very largely removed.
In the soot-cleaning process, a water spray is applied to the inner side of the flue gas duct. To this end, a fan, a blower or an r nozzle is preferably used as a water-application device.
The flue gas duct is preferably cleaned using a soot-cleaning process in which a cleaning agent is blown through the flue gas duct, whereby the cleaning agent is directed through the flue gas duct and towards the outside of the flue gas duct. If the soot-cleaning process is done using a fan, a blower or an r nozzle as a blowing device, the cleaning agent is blown through the flue gas duct. To this end, a fan, a blower or an r nozzle is preferably used as a blowing device. The blowing device, preferably the fan or the blower, is preferably arranged in a region inside the flue gas duct where there is a concentration of r flow. This is advantageous because the blowing device is better able to deliver the cleaning agent towards the soot particles and/or soot build-up.
In one advantageous refinement of the invention, the soot-cleaning process is carried out in which the soot, after an initial cleaning, is completely removed from the flue gas duct. In this way, complete soot-cleaning can be achieved in a single cleaning step.
To achieve complete soot-cleaning of the flue gas duct, the process according to the invention is preferably carried out in which the flue gas duct is cleaned twice in succession and the soot is removed agn in the course of this process. In this way, a second soot-cleaning step is preferably carried out.
In a further refinement, a soot-