CN108332182B

CN108332182B - Cross-flow boiler

Info

Publication number: CN108332182B
Application number: CN201810245402.6A
Authority: CN
Inventors: 石裕高
Original assignee: Bright Thermal Energy Equipment Co ltd
Current assignee: Bright Thermal Energy Equipment Co ltd
Priority date: 2018-03-23
Filing date: 2018-03-23
Publication date: 2023-06-30
Anticipated expiration: 2038-03-23
Also published as: CN108332182A

Abstract

The invention discloses a through-flow boiler, which comprises an upper header, a lower header, an inner water pipe and an outer water pipe which are respectively communicated with the upper header and the lower header, wherein the lower end of an annular isolation sleeve positioned in the upper header is positioned between pipe orifices at the upper ends of the inner water pipe and the outer water pipe, and the pipe orifice at the upper end of the annular isolation sleeve is smaller than the diameter of the pipe orifice at the lower end. Because the heat load of the inner water pipe is high, the water circulation flow rate of the inner water pipe is high, after the annular isolation sleeve is additionally arranged, the steam water of the inner water pipe is restrained by the annular isolation sleeve in a closing shape to change the flow direction, meanwhile, because the section of the annular isolation sleeve is larger than the area set of the inner water pipe, the fluctuation phenomenon of the liquid level in the area of the annular isolation sleeve is effectively relieved and weakened, meanwhile, the heat steam is favorably guided to rise, the liquid level outside the area of the annular isolation sleeve is hardly influenced and kept in a standing state, and cold water is favorably led into the outer water pipe to form a descending state.

Description

Cross-flow boiler

Technical Field

The invention relates to a through-flow boiler, in particular to an improvement of a water-steam separation structure of the boiler.

Background

A water pipe is arranged between an upper header and a lower header of the through-flow boiler in the prior art, the water pipe is divided into an inner ring water pipe and an outer ring water pipe, smoke pipes are further arranged in the water pipe, and smoke in a hearth is discharged after the inner ring smoke pipe and the outer ring smoke pipe are sequentially discharged, so that the heat load of a heating surface of the through-flow boiler is high, and particularly the load of the inner ring water pipe accounts for about 80-90% of the total load, and the water circulation flow rate of the inner ring water pipe is high. Because the upper ends of the inner water pipe and the outer water pipe in the prior art are directly connected into the upper water collecting tank without shielding, the steam water inevitably directly impacts the water level, the phenomenon of steam water entrainment is serious, and meanwhile, the fluctuation of the water level is large in amplitude and frequency, and the fluctuation of the water level is severe, so that the water level regulation control is seriously influenced.

Disclosure of Invention

The invention aims to provide a through-flow boiler, which reduces the fluctuation amplitude and frequency of the fluctuation of the water level and the liquid level so as to improve the control and adjustment of the water level and the liquid level and improve the heat exchange efficiency of the boiler.

In order to achieve the above purpose, the present invention adopts the following technical scheme: a tubular boiler is composed of upper and lower headers, and inner and outer water tubes communicated with said upper and lower headers, and the lower ends of annular isolating sleeve tubes in said upper header are between the upper ends of said water tubes and the diameter of said upper ends of said isolating sleeve tubes.

Because the heat load of the inner water pipe is high, the water circulation flow rate of the inner water pipe is high, after the annular isolation sleeve is additionally arranged, the steam water of the inner water pipe is restrained by the annular isolation sleeve in a closing shape to change the flow direction, meanwhile, because the section of the annular isolation sleeve is larger than the area set of the inner water pipe, the fluctuation phenomenon of the liquid level in the area of the annular isolation sleeve is effectively relieved and weakened, meanwhile, the heat steam is favorably guided to rise, the liquid level outside the area of the annular isolation sleeve is hardly influenced and kept in a standing state, and cold water is favorably led into the outer water pipe to form a descending state.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

fig. 2 is a sectional view A-A in fig. 1.

Detailed Description

Referring to fig. 1 and 2, the cross-flow boiler includes upper and

lower headers

10 and 20 and inner and outer

ring water pipes

30 and 40 respectively communicating with the upper and

lower headers

10 and 20, and a lower end of an annular isolation sleeve 50 positioned in the upper header 10 is positioned between upper end pipe openings of the inner and outer

ring water pipes

30 and 40, and an upper end pipe opening of the annular isolation sleeve 50 is smaller than a lower end pipe opening diameter.

The annular isolation sleeve 50 isolates the upper pipe orifices of the inner and outer

ring water pipes

30 and 40, the wet steam discharged from the inner ring water pipe 30 with high heat load and high flow speed ascends under the constraint of the annular isolation sleeve 50, the frequency and amplitude of the fluctuation of the liquid level of the area where the inner

ring water pipe

30 and 40 are positioned are reduced, the moisture is obviously reduced, the difficulty of steam-water separation is reduced, and in addition, the liquid level of the upper part of the outer ring water pipe 40 outside the annular isolation sleeve 50 is hardly influenced by the discharge of the steam. The closed-off arrangement of the annular isolation sleeve 50 effectively constrains the flow path of the hot gas, enabling the first steam-water separation of the moisture at the annular isolation sleeve 50.

As a preferable scheme, the annular isolation sleeve 50 is a stepped pipe with a large lower diameter and a small upper diameter, the lower end of the large pipe diameter of the annular isolation sleeve 50 is connected with the lower bottom plate of the upper header 10, the inner pipe diameter of the small pipe diameter of the upper end of the annular isolation sleeve 50 is larger than the pipe diameter of the inner side wall of the upper header 10, the pipe opening of the upper end of the annular isolation sleeve 50 is higher than or equal to the liquid level of a normal water level, and the pipe plate 51 at the position of the small lower diameter and the large upper diameter of the annular isolation sleeve 50 is arranged above the inner ring water pipe 30. In the above scheme, the area below the tube plate 51 is larger than the area collection of the tube cavities of all inner ring water tubes 30, so that the steam and water at the steam exhaust position at the upper end of the inner ring water tubes 30 are slowly released for the first time, the frequency and amplitude of the fluctuation of the liquid level in the area of the annular isolation sleeve 50 are reduced, the water content of the hot steam is reduced, meanwhile, under the constraint of the tube plate 51, the steam and water transversely flow inwards in the radial direction and then flow upwards, the upper end tube orifice of the annular isolation sleeve 50 is higher than or equal to the liquid level of the normal water level, and the arrangement can ensure that the water area outside the annular isolation sleeve 50 is hardly influenced, so that the monitoring precision of the water level and the liquid level is ensured.

After the moisture leaves the annular isolation sleeve 50, the moisture needs to be subjected to steam-water separation again, and the specific scheme is as follows: the upper header 10 is also internally provided with a steam collecting box 60, the steam collecting box 60 is annular and is positioned above the pipe orifice at the upper end of the annular isolation sleeve 50, the bottom of the steam collecting box 60 is higher than or equal to the liquid level of a normal water level, a steam-water separation unit is arranged at an air inlet on the outer side wall of the steam collecting box 60, the bottom of the steam-water separation unit is connected with a water collecting ring box 70, a drain pipe 71 is arranged at the bottom of the water collecting ring box 70 and extends downwards to below the liquid level of the water level, the upper part of the steam collecting box 60 is communicated with a steam outlet pipe 80, a water outlet pipe 61 is arranged at the bottom of the steam collecting box 60 and extends downwards to below the liquid level of the water level, and the water outlet pipe 61 and the drain pipe 71 are positioned outside the annular isolation sleeve 50.

In the above-mentioned scheme, the steam-water separation unit is disposed at the inlet of the steam-collecting box 60, and a small amount of water is separated from the moisture entering the steam-collecting box 60 and falls to the bottom of the steam-collecting box 60 to be discharged downwards through the water outlet pipe 61, and the water collected by the steam-water separation unit is collected by the water-collecting ring box 70 and discharged through the water outlet pipe 71. The water outlet pipe 61 is arranged at the bottom of the steam collecting tank 60, so that the water collected in the steam collecting tank 60 can be prevented from being mechanically carried by physical mixing in the steam flowing process.

The lower part of the small pipe diameter of the annular isolation sleeve 50 is provided with a through hole 52 communicating the inside and the outside of the cavity. Ensuring that the water levels inside and outside the annular isolation sleeve 50 are consistent.

The following describes the concrete constitution of the steam-water separation unit, the air inlets on the outer side wall of the steam-collecting box 60 are uniformly arranged at intervals in the circumferential direction, each air inlet is correspondingly provided with a steam-water separation unit, the steam-water separation unit is a corrugated plate assembly 90, the outer side of the radial direction of the corrugated plate assembly 90 is a steam inlet side, the inner side of the radial direction of the corrugated plate assembly 90 is connected with the air inlets on the outer side wall of the steam-collecting box 60, and the plate surface of the corrugated plate assembly 90 in the projection of the horizontal direction is corrugated in the radial direction. The steam-water separation unit can be realized by adopting other units or components with the same effect.

Claims

1. The utility model provides a through-flow boiler, includes header (10), lower header (20) and with header (10), lower header (20) respectively inner circle water pipe (30), outer lane water pipe (40) of intercommunication, its characterized in that: the lower end of an annular isolation sleeve (50) positioned in the upper header (10) is positioned between the upper end pipe orifices of the inner ring water pipe (30) and the outer ring water pipe (40), and the upper end pipe orifice of the annular isolation sleeve (50) is smaller than the diameter of the lower end pipe orifice;

the annular isolation sleeve (50) is a stepped pipe with a large lower diameter and a small upper diameter, the lower end of the large pipe diameter of the annular isolation sleeve (50) is connected with the lower bottom plate of the upper header (10), the inner pipe diameter of the small pipe diameter at the upper end of the annular isolation sleeve (50) is larger than the pipe diameter of the inner side wall of the upper header (10), the pipe opening at the upper end of the annular isolation sleeve (50) is higher than or equal to the liquid level of a normal water level, and a pipe plate (51) at the reducing positions of the large lower diameter and the small upper diameter of the annular isolation sleeve (50) is arranged above the inner ring water pipe (30).

2. The through-flow boiler according to claim 1, characterized in that: the upper header (10) is internally provided with a steam collecting box (60), the steam collecting box (60) is annular and is positioned above the upper end pipe orifice of the annular isolation sleeve (50), the bottom of the steam collecting box (60) is higher than or equal to the liquid level of a normal water level, a steam-water separation unit is arranged at an air inlet on the outer side wall of the steam collecting box (60), the bottom of the steam-water separation unit is connected with a water collecting ring box (70), a drain pipe (71) is arranged at the bottom of the water collecting ring box (70) and extends downwards to below the liquid level of the water level, the upper part of the steam collecting box (60) is communicated with a steam outlet pipe (80), a water outlet pipe (61) is arranged at the bottom of the steam collecting box (60) and extends downwards to below the liquid level of the water level, and the water outlet pipe (61) and the drain pipe (71) are positioned outside the annular isolation sleeve (50).

3. The through-flow boiler according to claim 1, characterized in that: the lower part of the small pipe diameter of the annular isolation sleeve (50) is provided with a through hole (52) communicating the inside and the outside of the cavity.

4. The through-flow boiler according to claim 2, characterized in that: the air inlets on the outer side wall of the steam collecting box (60) are uniformly arranged at intervals in the circumferential range, each air inlet is correspondingly provided with a steam-water separation unit, each steam-water separation unit is a corrugated plate assembly (90), the outer side of the radial direction of each corrugated plate assembly (90) is a steam inlet side, the inner side of each corrugated plate assembly is connected with the air inlets on the outer side wall of the steam collecting box (60), and the plate surface of each corrugated plate assembly (90) in the projection of the horizontal direction is corrugated in the radial direction.