SU1462061A1 - Evaporating section of boiler - Google Patents

Abstract

Invention m. used in boilers with natural circulation. The purpose of the invention is to increase the reliability of circuit circulation by reducing the hydraulic resistance by transferring water from the middle section of the collecting manifold to its end sections connected to recirculation pipes, as well as by improving the separation of steam in the collecting collector and reducing the likelihood of steam into recycle pipes. The middle sections of the distributing and collecting horizontal collectors (K) 1, 2 are interconnected by evaporator tubes 3, and the end sections - by recirculation tubes 4. The outlet nozzles 5 are distributed along the length K 2, equipped with at least one. a beam of bypass pipes 7, longitudinally placed in its cavity, perforated in the upper part in the zones between nozzles 5. Pipe boards LV, 9 pipes 7 are installed in K 2 transversely to form upper and lower bypass openings 10, It and the length of the beam. Extreme

Description

Board 8 is located between the end and middle sections of K 2. A tube bundle of 7 m. located at the bottom of K 2, which is m. equipped with guide partitions 12, transversely installed with the formation of lower bypass, openings 13 between the end sections K 2 and the corresponding

boards 8. Placing tube bundles 7 in K 2 improves the drainage of water from K 2 to tubes 4, which allows an increase in the amount of recirculated water. The presence of tube bundle 7 in K 2 contributes to the partial separation of water and steam in K 2, which also increases the degree of recirculation. 3 hp f-ly, 4 ill.

one

This invention relates to energy.

can be used in natural circulation boilers. .

The purpose of the invention is to increase the circulation of the evaporator circuit of the boiler by reducing the hydraulic resistance.

Fig. 1 shows schematically the pre-evaporated evaporating circuit 10 of the boiler, general view; figure 2 is a view of And figure 1; on fig.Z - section BB in figure 1; figure 4 - section b-Vna.fig.1.

The boiler evaporator circuit contains distributing and collecting horizontal collectors 1 and 2, respectively, the middle sections of which are interconnected by evaporator tubes 3, and the end sections - by recirculation tubes 4. The collecting plug 20 2 is equipped with discharge pipes 5 distributed along its length, and the distributing collector 1 - with inlet pipes 6, distributed along the length of the collector 1. The collecting collector 25 2 is additionally equipped with at least one perpendicular bundle longitudinally placed in the cavity of the cavity pipes 7 with extreme pipes -:,. 8 and medium pipe 30 boards 9 installed transversely in collector 2 to form upper and lower bypass openings 10 and 11, respectively, and distributed along the length of the beam. At least one of the extreme tube plates 8 of the bundle of overflow tubes 7 is located between the end and middle sections of the collector 2.

The overflow pipes 7 are perforated at the top, in parts, in the zones between the discharge pipes 5 of the collecting

collector 2. The bypass tube bundle 7 is located in the lower part of the collecting manifold 2. The latter is additionally equipped with guide partitions 12 transversely installed to form the lower bypass openings 13 between the end portions of this collector 2 and the corresponding outer tube plates 8. The evaporator circuit of the boiler also contains separation. a device (not shown), which is connected by a system of lifting and descending pipes (not shown) respectively to the manifolds 5 of the manifold 2. and to the manifolds of the collector 1.

Evaporative circuit of the boiler works as follows.

The circulating fluid flows through the nozzles 6 into the distribution manifold 1, passes through the evaporator tubes 3, where it absorbs the heat of hot gases, partially evaporates, and in the form of a water-vapor mixture enters the collecting manifold 2 and then through (the nozzles .5 pipes are sent to a separation device.In a separation device, water is separated from steam and through the downhole system through pipes 6 it returns again to collector 1. Part of water from collector 2 through perforations enters inside pipes 7 and transports tiruets end portions in the collector 2 and further through the recirculation pipe 4 into the reservoir 1. From the reservoir zones 2 adjacent to the tube sheet 8, the water in the recirculation pipe 4 enters through the openings 11.

Placing a bundle of perforated pipes 7 in the collecting manifold 2 improves the drainage of water from the collector 2 to the recirculation pipes 4, which allows an increase in the amount of recirculated water. This reduces the resistance of the circuit and increases its reliability. In addition, the presence of a bundle of pipes 7 in the collecting manifold 2 contributes to the partial separation of water and steam in the collector 2, which also increases the degree of recycling. The implementation of tube plates 8 and 9 with openings 10 and 11 ensures an unimpeded removal of steam into the nozzles 5 and the movement of water in the lower part of the collector 2. The placement of the pipes 7 in the lower part of the collector 2 and the perforations .- in the upper parts of the pipes 7 reduces the likelihood of steam entering the pipes 7 when the steam mixture is separated in the collector 2 and when the steam moves from the pipes 3 to the upper part of the collector 2. The location of the perforations in the zones of the pipes 7 located between the pipes 5 also reduces the ingress of steam into the pipes 7 as the steam rises into the nozzles 5 and in these zones it is smaller than in the zones where the nozzles 5 are located. Placing the partition 12 reduces the likelihood of steam entering the recirculation pipes 4. In this way, the hydraulic resistance of the evaporator circuit of the boiler is reduced and the reliability of circulation is improved.

Claims (4)

1. Evaporative boiler circuit containing dispenser and collecting go0 five five 0 five 0 Horizontal collectors, the middle sections of which are interconnected by evaporator tubes, and the end sections are recirculation, and the collecting manifold is equipped with discharge pipes distributed along its length, characterized in that, in order to improve the reliability of circulation by reducing the hydraulic resistance, the collector collector provided with at least one perpendicular bypass beam arranged in its cavity with tube plates installed transversely in the collector Hovhan upper and lower overflow openings and distributed along the length of said beam, wherein at least one of the outer tube sheets disposed between the latter end and middle portions of said collector. 2. Circuit POP.1, characterized in that the overflow pipes are perforated in the upper part in the zones between the discharge pipes of the collecting manifold. 3. A contour according to claims 1 and 2, characterized in that the beam of overflow pipes is located in the lower part of the collecting manifold. 4. A contour according to claims 1 to 3, characterized in that the collecting manifold is additionally provided with guide baffles transversely installed to form lower bypass openings between the end portions of this collector and the corresponding outer tube plates. Type A 3 tt  - R FIG. g 5-5 FIG. If Compiler L. Andreev Ed. S. Lisin Techred M. Didyk Proofreader N. Korol Order 659/35 Circulation 381 VNIShSHSH State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 4/5, Moscow, Zh-35, Raushsk nab. 113035 Fi.Z Subscription