DD218940C2 - High-pressure fuel pipe for pre-combustion according to the Schwelbrand principle - Google Patents

Description

-2- 252 433

Starting from the lower horizontal tube collector, bend the membrane flue tube twice so that the upper tube collector forms an angle of almost 90 degrees to the lower tube collector.

embodiment

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawing show:

Fig. 1 - the high-pressure membrane flame tube according to the invention installed in the pre-combustion system, Fig. 2 - a section through the high-pressure membrane flame tube according to the invention.

The smoldering kiln 1 consists of a brick-lined with firebrick cladding 2 and an associated rotatable grate 4. The high-pressure membrane flame tube 3 has a parallel to each other, through which the cooling water pipes 5 constructed shell, the outer shell with each other smoke-tight by connecting plate or sheet metal strip 11 a suitable, heat-resistant material are connected. The tubes 5 terminate on both sides in circular tube collectors 6; 7, which in turn are connected smoke-tight with the connecting plates 11 and which are integrated into the boiler circuit. The upper tube collector 6 on the steam side via a discharge line 9 ending in the upper boiler space (vapor space) and the lower tube collector 7 on the water side via a feedwater supply line 8 connected to the boiler, which is connected to the lower tube collector 7 via a trouser section. The tube legs of the trouser piece connected horizontally to the circumferential tube axis of the lower tube collector 7 are offset by about 90 degrees from one another and arcuately guided to the lower tube collector 7 that occurring thermal stresses or strains are sufficiently compensated. Centered between the pipe legs of the trouser piece below the lower tube collector 7 in the range of smoldering firing fireproof isolated, lockable drain line 10 led out of the lower tube collector 7. For better adaptation of the high-pressure membrane flame tube 3 to the flame tube of the high-pressure steam generator, the high-pressure membrane flame tube according to the invention from the lower, horizontal tube collector 7 twice bent so that the upper tube collector 6 to the lower tube collector 7 forms an angle of almost 90 degrees.

Claims (1)

-1- 252 403 4 Invention claim: High pressure flame tube for Vorfeuerungen after the Schwelbrandprmzip, characterized in that the high-pressure flame tube is designed as a membrane flame tube whose wall is formed of parallel lying, flowed through by Kuhlwasser tubes (5), the outer sheath interconnected by Verbmdungsbleche (11) from a suitable heat-resistant material smoke gas tight be and on both sides in kreisringformigen pipe collectors (6, 7) ends whose outer jacket are also connected smoke-tight with the connecting plates (11) and which are integrated into the boiler circuit of the high-pressure steam generator, namely the upper pipe collector (6) on the steam side over one in the upper boiler room (Steam chamber) ending discharge (9) and the lower pipe collector (7) on the water side via a feedwater supply line (8), on the one hand to the high pressure boiler (not shown) and on the other hand via a trouser piece to the lower pipe collector (7) is connected, wherein the horizontal to 90 degrees against each other and arcuately guided to the lower tube collector (7) and centrally between them below from the lower tube collector (7) in the range of smoldering fireproof fireproof isolated, lockable Ablammleitung (10) is led out and further wherein the high-pressure diaphragm tube (3) from horizontally located lower tube collector (7) is bent twice so that the upper tube collector (6) to the lower tube collector (7) forms an angle of almost 90 degrees For this 1 page drawings Field of application of the invention The invention relates to a high-pressure flame tube for Vorfeuerungen after the Schwelbrandprmzip with Saugzugbeluftung whose cooling circuit is integrated into the boiler circuit of a high-pressure steam generator Characteristic of the known technical solutions The use of Vorfeuerungen after the Schwelbrandprmzip with Saugzugbeluftung, especially for the combustion of difficult or low-grade solid fuels, such as Rohbraunforderkohle, for heating purposes is known Such Vorfeuerungen are generally used only for non-pressurized heating systems (member boilers) or for steam generators with low-pressure steam The use of high-pressure steam generators Especially with regard to the substitution of low-grade liquid or gaseous fuels by low-grade solid fuels while minimizing the cost of retrofitting has hitherto been used only occasionally and exclusively only for remote from the boiler circuit cooling circuit for pre-firing flame tubes The generally used in such Schwelofenvorfeuerungen form The unpressurized Flammrohrkuhlung can only be combined with low-pressure steam generators or hot water heaters (link boiler with the actual heating circuit and thus on On the other hand, an optimal utilization of the heat produced during the Schwelofenvorfeuerung given separate circuits for hot water and high-pressure steam is not given in all application cases and not in all, for example, any annual and / or daytime conditional or influenced operating conditions In the application of oil or gas burners, the use of a so-called Strahlungsheizabschnittes has been proposed as a steam generator (DE-OS 3026866) This Strahlungsheizabschnitt is in the form of a cylindrical, horizontally arranged, provided with a refractory lining of the inner wall shell with a burner for feeding a flame body On the refractory lining of the housing shell inner wall pipes are mounted in several maanderformig side by side strands and connected to the feed water source or the steam pump means throughput controls for each of the tube paths thus created is to be guaranteed that the throughput in all paths the same held and thus a uniform heat dissipation can be guaranteed Object of the invention It is an object of the invention to develop a high-pressure combustion tube for Vorfeuerungen after the Schwelbrandprmzip to use the Vorfeuerungen to high-pressure steam generators, in particular for the substitution of high-quality liquid or gaseous by low-grade solid fuels, the use of which optimally exploiting the heat produced in the Schwelbrandvorfeuerung while minimizing the cost of retrofitting Explanation of the essence of the invention The invention has for its object to develop a high-pressure flame tube for the use of Vorfeuerungen after Schwelbrandprmzip to high-pressure steam generators, which can be connected with minimal Umrustungskosten to the flame tube of the high pressure steam generator and its cooling circuit can be integrated into the circuit of the high-pressure steam generator According to the invention, this object is achieved with a designed as a high-pressure flame tube Membiamlammrohr whose wall is formed of parallel lying, flowed through by Kuhlwasser tubes whose outer jacket are connected smoke-tight with each other by sheets of a suitable, heat-resistant material and ends on both sides in kreisringformigen pipe collectors, said The pipe collectors are in turn integrated into the boiler circuit of the high-pressure steam generator The upper pipe collector on the steam side via an upper boiler room (L ampfraum) ending discharge and the lower pipe collector water side via a feedwater supply line connected to the boiler, which is connected via a trouser piece to the lower pipe collector Here, the horizontally connected to the rotating pipe axis of the lower pipe collector pipe legs of the supplied hearing trouser pieces symmetrically offset by about 90 degrees from each other and arcuately guided to the lower tube collector that occurring thermal stresses or expansions are sufficiently compensated M'ttig between the tube legs of the trouser piece below the lower tube collector fireproof isolated in the range of the oven, lockable Abschlammleitung led out of the lower tube collector for better adaptation of the high-pressure membrane flame tube according to the invention to the respective flame tube of the high-pressure steam generator is the