CS239580B1 - Vaporizer of steam generator with fluidity combustion - Google Patents

Abstract

The present invention relates to evaporator heat exchangers areas where they are dealt with linking and deploying to create two separate fluid foci with evaporator tubes passed through the flush layer. The essence of the invention is that the walls tapered using unsymmetrical fittings with molded side walls they create the front and rear focal points the bottom is formed of side wall tubes and γ which are in the fluidized bed submerged evaporator loops from the pipes from the front and rear walls.

Description

The present invention relates to evaporator heat exchanger surfaces in which they are interconnected and spaced to form two separate fluidized beds with evaporator tubes passing through the fluidized bed.

SUMMARY OF THE INVENTION The invention is based on the fact that the walls constricted by asymmetrical shaped pieces with shaped side walls form a front and a rear focus, the bottom of which is formed of sidewall tubes and in which fluidized layers are submerged in evaporator loops from tubes leading from the front and rear. the walls.

and

REZ: C-C

FIG

The present invention relates to evaporator heat exchanger surfaces in which their mutual connection and distribution with the purpose of forming two separate fluidized beds with the evaporator tubes passed through the fluidized-bed layer are addressed.

The recent unprecedented development of fluidized-bed fuel combustion has been driven by time requirements to reduce the level of harmful combustion products (NO _X , SO _X ) in the atmosphere to an acceptable level. One of the possible ways of solving this problem is also atmospheric fluidized bed combustion, which is carried out in cooperation of suitable additives (limestone, dolomite, etc.) over chemical bonding of sulfur oxides (SO _X ). This desired effect can be achieved by burning solid fuels with several types of fluidized bed. Known are such outbreaks placed one above the other and have eaten themselves. The latter are from the regulatory point of view divided into more or less separate fireplaces with separate fuel and air inlets, or to fireplaces, where there is a separate air supply, but the fuel supply is designed for several outbreaks. The common problem of these outbreaks is the solution of a suitable way of their separating partitions, which can be part of the pressure unit - evaporator, or part of the non-pressure unit (spit sheet metal or brick walls). Fluidized-bed solutions in which the diaphragm walls are welded together with markedly different surface heat load values are also disadvantageous.

The above-mentioned drawbacks are overcome by the evaporator of a fluidized-bed steam boiler according to the invention, consisting of membrane walls, evaporator loops and suspension tubes, characterized in that the walls constricted by asymmetrical shaped pieces, with shaped matching side walls, form front and rear foci. the double bottom is formed of side wall tubes and in the spaces in which the evaporator loops are submerged in the fluidized bed formed of the evaporator tubes discharged from the front and rear walls. The rear wall tubes in the calculated height alternately, with spacing - 2t -, also form the ceiling of any fireplace, the rear wall of the second flue gas draft, the boiler ceiling and after forking with symmetrical forks also the suspension flue tubes of the first flue gas draft.

By realizing the partition wall, the double walls formed from the tubes of the front and rear walls as well as the side walls, four airtight box-specific sections are created for the supply of pressurized combustion air, which is supplied to the fluidized bed by a set of special extensions. These four perfectly sealed spaces are significant in terms of enabling the power control of the steam boiler over a relatively wide power range. Besides the perfect tightness of the air boxes, this solution also brings the advantages of the self-supporting fluid grate.

In FIG. 1 and 2, there is shown schematically in sections A-A, B-C, C-C a steam boiler with atmospheric fluid combustion with a marked vaporizer portion. In FIG. 3 is a section A-A and FIG. 4 in section C-C shows in detail the evaporator of a fluidized bed steam boiler.

The working medium enters the evaporator 25 through the distribution chambers 1, passes through the tubes of the individual walls 3, 4, 5, 12, 23 into the collecting chambers 2 through which the evaporator walls 3, 4, 5, 12, 23 are terminated. The tubes of the front and rear walls 3, 5 at regular intervals are bent and form the evaporator loops 15 which are immersed in the fluidized bed 24 at the front and rear fluid focus 19, 20. Furthermore, these tubes and tubes of the divider 5 are The fittings 17 are maintained with their basic spacing - t -, where t is the distance of two adjacent tubes of the membrane wall. The tubes of the rear wall 4, also in the calculated height, are alternately guided, already at a spacing of 2t, so that one tube above any focal point forms an oblique ceiling 7 and the other go straight so as to form the rear wall 12 of the second flue draft 22 6 of the steam boiler through which the upper grate tubes 10 penetrate. Through the lower grille 9 of the divider wall 5 penetrate the slanted ceiling tubes 7, which are further forked by symmetrical fittings 16. Continued as tubes of smaller diameter form the suspension tubes 8 located in the first flue draft. The side walls are shaped to fit the tapered walls 3, 4, 5. At the bottom of the side walls 23, the tubes are alternately guided with a spacing of 2t so that one forms the bottom 14 of the front and no foci 19, 20 and the other forms a lattice 26. combustion air supply. The flue gas leaves the boiler through the rear wall lattice 13 of the second draft 22. The ceilings 6, 7 are protected by an ointment 18 against adverse effects of the flue gas.

Another advantage not mentioned so far is the overall rigidity of the evaporator wall construction, which are reinforced from the inside by an intervening and sloping ceiling of any focus, so that the boiler does not require a relatively massive reinforcement of the membrane walls by the decking 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).