Traveling grate combustion system with trickle pipes traversing the combustion chamber to feed pre-dried fuel onto the incoming grate track

Description

[0001] Traveling grate combustion system with trickle pipes traversing the combustion chamber for feeding pre-dried fuel onto the incoming Grate track The invention relates to a traveling grate combustion system in which water-containing granular or dust-containing fuels, in particular Low-temperature coke, raw lignite, or similar materials are fed onto the incoming grate track by means of trickle pipes traversing the combustion chamber. Through the The moisture is driven out of the fuel trickling down the pipes by the fire-"asen" (high-temperature pipes). that largely dried fuel reaches the grate inlet.

[0002] If granular or even highly dusty fuel is used as fuel, difficulties arise with regard to the sealing of the inlet gap of the traveling grate. Since traveling grate furnaces, especially those fed with fine-grained fuels, are mostly equipped with If operated with downwind, there is a risk that both fire ointments and fine-grained components of the fuel will pass through the inlet gap. to be blown outwards. This deficiency t' ;Z cannot be effectively remedied by #a correspondingly small dimensioning of the inlet gap, because, in order to avoid jamming due to the warping of the battery members caused by temperature changes, a certain degree cannot be reduced, apart from the fact that with various grates for the combustion of fine-grained fuels, for example in the case of the well-known fungal rusts, considerable stomata are already present due to the space between the fungi. The risk of fuel being blown out is also particularly high with these combustion systems because at the inlet point of the A high degree of dust formation occurs when the BrenngLites trickles out of the trickle pipes due to the migrating rust.

[0003] This deficiency is remedied in the traveling grate furnace forming the subject matter of the invention by sealing the A fuel layer, leveled from the outside, is provided in the small gap at the inlet point of the traveling grate. Since this If a sealing agent is used with a fuel that has the same combustion properties as the fuel placed inside, then Adverse effects of the sealing agent on the combustion process or the grate elements are excluded.

[0004] An embodiment of the invention is shown in the drawing, Z, t' iz, namely shows Fig. i shows a longitudinal section through a steam boiler combustion system, whose traveling grate is fitted with the new seal at its inlet point, Fig. 2 a cross-section along line AB of Fig. i.

[0005] The grate conveyor chain is denoted by i, the grate plates by 2, and the drive of the traveling grate by 3. The combustion chamber 4 The enclosing walls 5 are lined with pipes 6, which, for example, form the radiantly heated part of a single-pipe evaporator with Forced flow is formed, ZD above which the contact pipe section 7 is located in the known manner. To pre-dry the fuel on the traveling grate. To enable the grate to be abandoned, trickle pipes 8 are inserted through the firebox wall, which limits the outlet side 9 of the traveling grate, and which contain the firebox The fuel is traversed diagonally in section 4 and terminates above the grate inlet. The fuel is distributed to the pipes by rotary valves. io, which are installed in the outlet of the fuel bituric ii. Because the rotary wheels are located above the axis of the trickle tubes, the trickling pipes are provided with lockable cleaning openings 12 at their upper end.

[0006] In order to seal the traveling grate operated with bottom rail at the inlet side 13, according to the invention an externally applied Fuel layer used, in particular a layer of smoldering coke 14. This coke layer prevents combustion gases or fine-grained fuel particles can escape from the combustion chamber.

[0007] The feeding of the inclined traveling grate by the PZieselrohr-r#e is expediently carried out in such a way that the Rotational speed of the cell wheels depending on the load on the grate, for example depending on the rotational speed of the downdraft blower. Therefore, a fuel layer 16 automatically forms in the combustion chamber, the height of which corresponds to the respective This ensures that the fuel always leaves the outlet side of the grate completely burned. It is advisable to... Rotational speed of the cell wheels independent of the expediently constant feed rate of the wall grid. make.

Claims

[0008] PATENT ANS L'RU CI1: Traveling grate combustion chamber with trickle tubes traversing the fire chamber for feeding pre-dried fuel onto the inlet grate tap, primarily for granular or dust-like, water-containing fuels, especially scliweled coke, characterized by, that to seal the small gap present at the inlet point of the traveling grate, a fuel layer leveled from the outside (14) is planned.