CN212298961U - Economizer structure of 116MW circulating fluidized bed hot water boiler - Google Patents

Abstract

The utility model discloses a 116MW circulating fluidized bed boiler's economizer structure has solved how to improve and has utilized the flue gas to improve the problem of its ability of self-cleaning deposition when moving. The boiler tail flue is characterized by comprising a boiler tail flue, a low-temperature economizer snakelike pipe box (2) and a high-temperature economizer snakelike pipe box (6), wherein a pipe bundle in the low-temperature economizer snakelike pipe box (2) and a pipe bundle in the high-temperature economizer snakelike pipe box (6) are horizontally arranged; the depth of the boiler tail flue is 2835 mm, the width of the boiler tail flue is 8600 mm, the tube bundle in the low-temperature economizer snake-shaped tube box (2) and the tube bundle in the high-temperature economizer snake-shaped tube box (6) are both composed of two groups of zigzag tubes which are arranged in a staggered mode, the outer diameter of each group of the zigzag tubes is 42 mm, the transverse distance of tube rows is 45 mm, and the longitudinal distance of the tube rows is 80 mm. Greatly improves the self-ash-cleaning capability of the coal economizer at the rated load of the boiler or close to the rated load.

Description

Economizer structure of 116MW circulating fluidized bed hot water boiler

Technical Field

The utility model relates to an economizer structure of circulating fluidized bed boiler, in particular to economizer structure of 116MW circulating fluidized bed boiler.

Background

The circulating fluidized bed hot water boiler is mainly a boiler for providing hot water with certain parameters for users, and is mainly different from a steam boiler in that the hot water boiler has no superheater, and coal economizers are arranged in a tail flue; in recent years, one of the most common problems of the hot water boiler is high exhaust gas temperature, which not only causes the increase of exhaust gas heat loss, the reduction of boiler efficiency and poor boiler operation economy, but also causes the phenomenon of furnace shutdown caused by the damage of tail equipment such as a dust remover due to overhigh exhaust gas temperature, and one of the main reasons for analyzing the high exhaust gas temperature of the hot water boiler is caused by ash deposition of an economizer; in addition, the hot water boiler generally operates in the heating season in winter, and is in a boiler shutdown state in summer, the ash deposition of the economizer from summer to winter can seriously affect the operation of the economizer in the heating season in winter, and how to improve the capability of utilizing smoke to remove the ash deposition during operation becomes a problem that the structural design of the economizer needs to be considered.

Disclosure of Invention

The utility model provides a 116MW circulating fluidized bed boiler's economizer structure has solved how to improve and has utilized the flue gas to improve its technical problem from the ability of cleaing away the deposition when moving.

The utility model discloses a solve above technical problem through following technical scheme:

a coal economizer structure of a 116MW circulating fluidized bed hot water boiler comprises a boiler tail flue, a low-temperature coal economizer snake-shaped pipe box and a high-temperature coal economizer snake-shaped pipe box, wherein a pipe bundle in the low-temperature coal economizer snake-shaped pipe box and a pipe bundle in the high-temperature coal economizer snake-shaped pipe box are both horizontally arranged, and the central axis of each pipe and the central axis of the boiler tail flue in the vertical direction are mutually vertical; the depth of the boiler tail flue is 2835 mm, the width of the boiler tail flue is 8600 mm, the tube bundle in the low-temperature economizer coiled tube box and the tube bundle in the high-temperature economizer coiled tube box are both composed of two groups of staggered coiled tubes with the outer diameter of 42 mm, the transverse spacing of the tube rows is 45 mm, and the longitudinal spacing of the tube rows is 80 mm.

An economizer supporting beam and an economizer protecting tile are respectively arranged in a boiler tail flue, a tube bundle in a low-temperature economizer coiled tube box and a tube bundle in a high-temperature economizer coiled tube box are both horizontally arranged on the economizer supporting beam, a tube clamp is arranged between the economizer protecting tile and the tube bundle in the low-temperature economizer coiled tube box, and a soot blower is arranged in the boiler tail flue.

The utility model discloses a conventional horizontal intercept between the adjacent pipe in the reducing economizer tube bank has improved the velocity of flow that the flue gas passes through the gap between the tube bank greatly to reach the self-cleaning ability of economizer when improving boiler rated load greatly or being close rated load, and do not wear and tear the heating surface, make the exhaust gas temperature control at normal scope, avoid the blowing out situation of boiler, improved user's economic nature.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a view from direction a in fig. 1.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings:

a coal economizer structure of a 116MW circulating fluidized bed hot water boiler comprises a boiler tail flue, a low-temperature coal economizer snake-shaped pipe box 2 and a high-temperature coal economizer snake-shaped pipe box 6, wherein a pipe bundle in the low-temperature coal economizer snake-shaped pipe box 2 and a pipe bundle in the high-temperature coal economizer snake-shaped pipe box 6 are both horizontally arranged, and the central axis of each pipe and the central axis of the boiler tail flue in the vertical direction are perpendicular to each other; the depth of the boiler tail flue is 2835 mm, the width of the boiler tail flue is 8600 mm, the tube bundle in the low-temperature economizer serpentine tube box 2 and the tube bundle in the high-temperature economizer serpentine tube box 6 are both composed of two groups of serpentine tubes which are arranged in a staggered mode, the outer diameter of each group of the serpentine tubes is 42 mm, the transverse distance L2 of each tube row is 45 mm, and the longitudinal distance L1 of each tube row is 80 mm.

A coal economizer supporting beam 8 and a coal economizer protecting tile 9 are respectively arranged in a flue at the tail of the boiler, a tube bundle in the low-temperature coal economizer snakelike tube box 2 and a tube bundle in the high-temperature coal economizer snakelike tube box 6 are both horizontally arranged on the coal economizer supporting beam 8, and the coal economizer supporting beam 8 is supported on a boiler steel frame 11; a pipe clamp 10 is arranged between the economizer protecting bush 9 and the pipe bundle in the low-temperature economizer snakelike pipe box 2; a soot blower is arranged on the flue at the tail part of the boiler.

The utility model discloses a water flow journey is: hot water with certain parameters heated from a hearth enters a low-temperature economizer inlet header 1, is led out by a serpentine pipe in a phi 42 low-temperature economizer serpentine pipe box 2 with the number of pipe heads of 2 and the transverse intercept of 45 mm and the longitudinal intercept of 80 mm, enters a low-temperature economizer outlet header 3, and then enters a high-temperature economizer inlet header 5 through a high-temperature economizer connecting pipe 4; then leading out a coil pipe in a phi 42 high-temperature economizer snake-shaped pipe box 6 by staggered arrangement with the pipe head number of 2 and the transverse intercept of 45 mm and the longitudinal intercept of 80 mm, entering a high-temperature economizer outlet header 7 and finally flowing out of the economizer; the high-temperature flue gas scours a high-temperature economizer with phi 42 pipes and staggered arrangement of 62 transverse pipes, 45 mm transverse intercept and 80 mm longitudinal intercept from top to bottom, and then scours a low-temperature economizer with phi 42 pipes and staggered arrangement of 62 transverse pipes, 45 mm transverse intercept and 80 mm longitudinal intercept, wherein economizer protecting tiles 9 are welded on the front two rows of windward sides of each group of serpentine pipes, elbows and wall penetrating positions.

Claims (2)

1. The economizer structure of the 116MW circulating fluidized bed hot water boiler comprises a boiler tail flue, a low-temperature economizer snakelike tube box (2) and a high-temperature economizer snakelike tube box (6), and is characterized in that a tube bundle in the low-temperature economizer snakelike tube box (2) and a tube bundle in the high-temperature economizer snakelike tube box (6) are horizontally arranged, and the central axis of each tube is vertical to the central axis of the boiler tail flue in the vertical direction; the depth of the boiler tail flue is 2835 mm, the width of the boiler tail flue is 8600 mm, the tube bundle in the low-temperature economizer snake-shaped tube box (2) and the tube bundle in the high-temperature economizer snake-shaped tube box (6) are both composed of two groups of zigzag tubes which are arranged in a staggered mode, the outer diameter of each group of the zigzag tubes is 42 mm, the transverse distance of tube rows is 45 mm, and the longitudinal distance of the tube rows is 80 mm.

2. The economizer structure of a 116MW circulating fluidized bed hot water boiler according to claim 1, characterized in that an economizer support beam (8) and an economizer protection tile (9) are respectively arranged in a tail flue of the boiler, a tube bundle in the low-temperature economizer serpentine tube box (2) and a tube bundle in the high-temperature economizer serpentine tube box (6) are both horizontally arranged on the economizer support beam (8), and a tube clamp (10) is arranged between the economizer protection tile (9) and the tube bundle in the low-temperature economizer serpentine tube box (2); a soot blower is arranged in the flue at the tail part of the boiler.

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