CS239580B1 - Fluidized-bed steam boiler evaporator - Google Patents

Abstract

The invention relates to evaporator exchanger surfaces, in which their mutual connection and arrangement are solved with the aim of creating two separate fluid centers with evaporator tubes guided through the fluid layer. The essence of the invention lies in the fact that the walls narrowed by means of non-symmetrical fittings, with shape-adapted side walls create front and rear centers, the bottom of which is formed from side wall tubes and in the spaces of which evaporator loops from tubes led out from the front and rear walls are immersed in the fluid layer.

Description

239580 3

BACKGROUND OF THE INVENTION The present invention relates to evaporator interchangeable diaphragms in which they are interconnected and disposed to form two separate fluidized wells with evaporator tubes through a fluidized bed of fuel. The current unprecedented development of fluidized fuel combustion technology has been prompted by the demands of time to reduce the level of harmful combustion products (NOX, SOX) to acceptable levels. One way of solving this problem is also the atmospheric fluidized bed combustion, which co-operates with suitable additives (limestone, dolomite, etc.) for the chemical binding of sulfur dioxide (SOX). This desired effect can be achieved by solidifying the solid fuels with several types of fluid beds. We know such outbreaks placed above one another and the self of the self. The latter are, from the regulatory point of view, subdivided into several or more separate flanges with separate fuel and air inlets, or flanges, in which the air supply is separate, but the fuel supply is designed for a plurality of hearths. A common problem with these outbreaks is the solution to the appropriate way of their separating partitions, which may be part of the pressure unit - the evaporator or part of the non-pressurized cell (barrels or masonry barriers). the ability to monitor the dilatation of the bonding membrane walls, as well as their lack of tightness and low strength, unable to withstand the high values of the combustion air pressures. different thermal load values.

The aforementioned drawbacks are eliminated by the vaporizer of the fluidized bed steam boiler according to the invention, consisting of diaphragm walls, evaporator loops and suspension tubes, which consists in the fact that the walls tapered by non-symmetrical fittings, with shaped side walls, form a front and a backround, the double bottom of which is formed by a sidewall rupture and in the spaces in which the evaporator loops are immersed in the fluidized bed formed of evaporator tubes extending from the front and rear walls. The rear wall tubes in a calculation determined alternately, with a spacing of - 2t -, at the same time the ceiling of no focal point, the rear of the second flue gas duct, the ceiling of the boiler after the damping with the symmetrical dies and the heater tube of the first flue gas draft.

By realizing a partition, double dienes formed from the tubes of the front and rear walls, as well as the side walls, four air-tight box-specific sections are provided for supplying pressurized combustion air, which is supplied to the fluidized-bed furnaces by special-purpose extensions. These four perfectly sealed spaces are important for enabling the power control of the steam boiler in a relatively wide output range. In addition to the perfect airtight boxes, this solution provides the advantages of the fluidized bed self-supporting.

1 and 2, a steam boiler is shown schematically in section A-A, B-B, C-C with a Satmospheric fluidized bed combustion with a marked evaporator section. Naobr. 3 is a cross-sectional view of the fluidized-bed steam boiler in section A-A and FIG. 4 in section C-C.

The working medium enters the evaporator 25 via the distribution chambers 1 through the passages of the individual walls 3, 4, 5, 12, 23 to the collection chambers 2, which are the evaporation walls 3, 4, 5, 12, 23 terminated. The tubes of the front and rear walls 3, 5 are bent out in a regular manner and form evaporator loops 15 which are immersed in the fluidized bed 24 in the front and rear fluid ports 19, 20. Furthermore, these tubes and tubes 5 are calculated by the unsymmetrical fitting 17 , wherein their basic ro-step - t - is maintained, where t is the distance of the two adjacent membranes of the membrane string. The rear wall tubes 4, also in the calculated height, are alternately guided, already at a spacing 2t, so that one tube above any focal point forms an oblique ceiling 7 and the other one goes straight to form a back wall 12 at the same time. also the ceiling 6 of the steam boiler through which the pipes of the upper grille 10 penetrate. Through the lower grille 9, the baffles 5 penetrate the pipes of the slanted ceiling 7, which are further divided by symmetrical fittings 16. Continuing as tubes a smaller diameter, the hinge tubes 8 are located in the first combustion duct 21. The side walls are shaped to the constricted walls 3, 4, 5. The bottom of the side walls 23 are tubes alternately guided, with a spacing of - 2t - such that they form one bottom 14 of the front and none of the recesses 19, 20 and the second form a grid 26 for supplying combustion air. They burn the boiler through the grid 13 of the rear wall of the second draft 22. The ceilings 6, 7 are protected by the protection 18 against the unwanted effects of the combustion.

Yet another not yet mentioned advantage of indicating the overall rigidity of the evaporator wall structures which are reinforced from the inside by a baffle and oblique ceiling of any focus such that the boiler does not require relatively massively reinforced diaphragm walls by the bandage platform system or by the bandages themselves.

Claims (4)

SUBJECT A fluidized bed steam boiler evaporator, consisting of membrane chambers, evaporator loops and suspension tubes, characterized in that the walls (3, 4, 5) are tapered by asymmetric fittings (17) with shaped matching side walls (23) they form a front and no focus (19, 20), the bottom (14) of which is formed from the side wall tubes (23) and in which the evaporator loops (15) are submerged in the fluidized bed (25) from the tubes led out of the front and rear walls ( 3, 4). Steam boiler evaporator according to claim 1, characterized in that the tubes of the rear wall (4) are alternately calculated in the calculated height. BACKGROUND OF THE INVENTION pipe spacing - 2t — where t is the spacing of two adjacent diaphragm tubes, they also form an oblique ceiling (7) of no focus, a rear wall (12) of the second flue gas draft and a boiler ceiling (6). Steam boiler evaporator according to items 1 and 2, characterized in that the slanted ceiling pipes (7) of any focal point after penetration by the divider (5) are forked by symmetrical fittings (16) and form the suspension pipes (8) in the first flue gas draft (21). ). Steam boiler evaporator according to one of Claims 1 to 3, characterized in that the boiler ceiling tubes (6) and the sloping ceiling tubes (7) of any focus are provided with an ointment (18).