Saturated steam cleaning mechanism in ultrahigh-pressure circulating fluidized bed boiler drum

Abstract

The utility model discloses a saturated steam cleaning mechanism in a boiler barrel of an ultrahigh-pressure circulating fluidized bed boiler. The saturated steam cleaning mechanism solves the problem of how to further improve the impurity removal rate of saturated steam in the boiler barrel. A saturated steam filter plate supporting frame (2) and a steam filter plate (15) are arranged in a boiler barrel (1), a partition plate (3) and a water distribution pipe (4) are arranged on the steam filter plate (15), the partition plate (3) and the water distribution pipe (4) are arranged between a boiler front space and a boiler rear space, and two rows of water spraying openings are formed in the water distribution pipe. A closed furnace front arc-shaped water guide cover (7) and a closed furnace rear arc-shaped water guide cover (8) are respectively arranged on the outer side wall of the water distribution pipe (4), a furnace front saturated steam filtering water film box closed frame (11) is arranged on the steam filtering plate (15) on one side of the isolation plate (3), and a furnace rear saturated steam filtering water film box closed frame (12) is arranged on the steam filtering plate (15) on the other side of the isolation plate (3); and the cleaning effect of saturated steam in the boiler is ensured.

Description

Technical Field

[0001] The utility model relates to an ultra-high pressure circulating fluidized bed boiler, in particular to a saturated steam cleaning mechanism in a drum of the ultra-high pressure circulating fluidized bed boiler. Background Art

[0002] The saturated steam generated by the circulating fluidized bed boiler is used for steam turbine power generation. The quality of saturated steam is directly related to whether the steam turbine can operate safely and economically. The quality of saturated steam generally refers to the amount of impurities in the steam. Therefore, the quality of saturated steam delivered by the drum of the circulating fluidized bed boiler is an important condition for ensuring the safe and economical operation of the boiler and the steam turbine. In the circulating fluidized bed boiler system, the water delivered to the drum is first heated to a certain temperature in the economizer, and then sent to the drum to mix with the boiler water. The drum not only receives economizer feed water and supplies water to the circulation loop, but also has the function of delivering saturated steam to the superheater. The saturated steam in the drum of the existing circulating fluidized bed boiler relies on mechanical separation to achieve the delivery and quality assurance of saturated steam. However, for ultra-high pressure circulating fluidized bed boilers, due to the relatively stringent requirements on the salt content in the saturated steam, how to improve the impurity removal rate of saturated steam in the drum has become a problem that needs to be solved on site. Summary of the invention

[0003] The utility model provides a saturated steam cleaning mechanism in a boiler drum of an ultra-high pressure circulating fluidized bed boiler, which solves the technical problem of how to further improve the impurity removal rate of saturated steam in the boiler drum.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A saturated steam cleaning mechanism in a drum of an ultra-high pressure circulating fluidized bed boiler comprises a drum, a hot water supply pipe heated by an economizer is arranged on the drum, a saturated steam filter plate support frame is arranged in the drum, a saturated steam filter plate is arranged on the steam filter plate support frame, saturated steam below the saturated steam filter plate passes through the saturated steam filter plate and enters above the saturated steam filter plate, an isolation plate between a furnace front space and a furnace rear space is arranged on the steam filter plate, a water distribution pipe is arranged on the isolation plate, the water distribution pipe is connected with the hot water supply pipe, a row of furnace front water spray ports and a row of furnace rear water spray ports are respectively arranged on the water distribution pipe, and closed furnace front arc-shaped water guide covers are respectively arranged on the outer side walls of the water distribution pipes and a closed rear-furnace arc-shaped water guide hood, a water outlet of the rear-furnace arc-shaped water guide hood is arranged at the lower end of the front-furnace arc-shaped water guide hood, a water outlet of the rear-furnace arc-shaped water guide hood is arranged at the lower end of the closed rear-furnace arc-shaped water guide hood, a row of front-furnace water spray outlets are arranged in the front-furnace arc-shaped water guide hood, and a row of rear-furnace water spray outlets are arranged in the rear-furnace arc-shaped water guide hood; a front-furnace saturated steam water filter membrane box closing frame is arranged on the steam filter plate on one side of the isolation plate, and a rear-furnace saturated steam water filter membrane box closing frame is arranged on the steam filter plate on the other side of the isolation plate, the water outlet of the front-furnace arc-shaped water guide hood is arranged above the front-furnace saturated steam water filter membrane box closing frame, and the water outlet of the rear-furnace arc-shaped water guide hood is arranged above the steam filter water membrane box closing frame.

[0006] A hot water supply water diversion pipe is arranged on the hot water supply pipe, and a water outlet of the hot water supply water diversion pipe is arranged in the boiler water in the boiler drum below the steam filter plate.

[0007] A steam cleaning water film is arranged on the steam filter plate in the closed frame of the saturated steam filter water film box in front of the furnace, and a steam cleaning water film is arranged on the steam filter plate in the closed frame of the steam filter water film box.

[0008] The saturated steam cleaning device of the utility model is evenly arranged along the entire length of the boiler drum, thereby ensuring the cleaning effect of the saturated steam and eliminating the kinetic energy of the cleaning water, avoiding splashing of water droplets in the steam space or flushing of the cleaning water layer, and preventing the cleaning water from directly rushing to the boiler drum wall and causing uneven thermal stress; the utility model has a simple structure and ensures the cleaning effect of the saturated steam in the ultra-high pressure circulating fluidized bed boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the utility model;

[0010] Figure 2 It is a structural schematic diagram of two water guide covers of the utility model;

[0011] Figure 3 It is a schematic structural diagram of the steam filter plate 15 of the utility model. Implementation

[0012] The utility model is described in detail below with reference to the accompanying drawings:

[0013] A saturated steam cleaning mechanism in a drum of an ultra-high pressure circulating fluidized bed boiler comprises a drum 1, on which a hot water supply pipe 13 heated by an economizer is arranged, a saturated steam filter plate support frame 2 is arranged in the drum 1, a saturated steam filter plate 15 is arranged on the steam filter plate support frame 2, saturated steam below the saturated steam filter plate 15 passes through the saturated steam filter plate 15 and enters above the saturated steam filter plate 15, an isolation plate 3 between a furnace front space and a furnace rear space is arranged on the steam filter plate 15, saturated steam sent from the furnace first enters the furnace space below the saturated steam filter plate 15, and must pass through the steam filter plate 15 before entering the upper part of the drum, a water distribution pipe 4 is arranged on the isolation plate 3, the water distribution pipe 4 is connected to the hot water supply pipe 13, and a row of furnace front water spray ports 5 and a row of furnace rear water spray ports are respectively arranged on the water distribution pipe 4. 6. A closed front-of-furnace arc-shaped water guide cover 7 and a closed rear-of-furnace arc-shaped water guide cover 8 are respectively arranged on the outer side walls of the water distribution pipe 4, a front-of-furnace arc-shaped water guide cover water outlet 9 is arranged at the lower end of the front-of-furnace arc-shaped water guide cover 7, and a rear-of-furnace arc-shaped water guide cover water outlet 10 is arranged at the lower end of the closed rear-of-furnace arc-shaped water guide cover 8. A row of front-of-furnace water spraying ports 5 are arranged in the front-of-furnace arc-shaped water guide cover 7, and a row of rear-of-furnace water spraying ports 6 are arranged in the rear-of-furnace arc-shaped water guide cover 8; a front-of-furnace saturated steam water filter membrane box closing frame 11 is arranged on the steam filter plate 15 on one side of the isolation plate 3, and a rear-of-furnace saturated steam water filter membrane box closing frame 12 is arranged on the steam filter plate 15 on the other side of the isolation plate 3, the front-of-furnace arc-shaped water guide cover water outlet 9 is arranged above the front-of-furnace saturated steam water filter membrane box closing frame 11, and the rear-of-furnace arc-shaped water guide cover water outlet 10 is arranged above the steam filter water filter membrane box closing frame 12.

[0014] A hot water supply water diversion pipe 14 is arranged on the hot water supply water diversion pipe 13, and the water outlet of the hot water supply water diversion pipe 14 is arranged in the boiler water in the boiler drum 1 below the steam filter plate 15; the thickness of the water film on the steam filter plate 15 can be changed by selecting hot water supply water diversion pipes 14 with different diameters, so as to realize the cleaning of the saturated steam passing through the water film; for the ultra-high pressure circulating fluidized bed boiler, it is generally selected to transport 50% of the hot water sent from the economizer to the hot water supply water diversion pipe 14 to form a saturated steam cleaning water film with a relatively suitable thickness.

[0015] A steam cleaning water film is arranged on the steam filter plate 15 in the closed frame 11 of the saturated steam filter water membrane box in front of the furnace, and a steam cleaning water film is arranged on the steam filter plate 15 in the closed frame 12 of the steam filter water membrane box; the pressurized hot water from the economizer water is sent to the water distribution pipe 4 through the hot water supply pipe 13, and the pressurized hot water is divided into two halves to a row of water outlets 5 in front of the furnace and a row of water outlets 6 behind the furnace. After the water is sprayed out, it is guided by the arc-shaped water guide cover 7 in front of the furnace and the arc-shaped water guide cover 8 behind the furnace to the closed frame 11 of the saturated steam filter water membrane box in front of the furnace and the closed frame 12 of the saturated steam filter water membrane box behind the furnace, forming a layer of water film; the saturated steam under the steam filter plate 15 passes through this layer of water film from bottom to top, and the salt and other impurities in the saturated steam are cleaned by water grinding, and the cleaned high-quality steam is input into the steam turbine.

Claims

1. A saturated steam cleaning mechanism in a drum of an ultra-high pressure circulating fluidized bed boiler, comprising a drum (1), a hot water supply pipe (13) heated by an economizer being arranged on the drum (1), a saturated steam filter plate support frame (2) being arranged in the drum (1), a saturated steam filter plate (15) being arranged on the steam filter plate support frame (2), saturated steam below the saturated steam filter plate (15) passing through the saturated steam filter plate (15) and then entering above the saturated steam filter plate (15), characterized in that: A partition plate (3) between the furnace front space and the furnace rear space is arranged on the steam filter plate (15), a water distribution pipe (4) is arranged on the partition plate (3), the water distribution pipe (4) is connected to the hot water supply pipe (13), a row of furnace front water spraying ports (5) and a row of furnace rear water spraying ports (6) are arranged on the water distribution pipe (4), a closed furnace front arc-shaped water guide cover (7) and a closed furnace rear arc-shaped water guide cover (8) are arranged on the outer side wall of the water distribution pipe (4), a furnace front arc-shaped water guide cover water outlet (9) is arranged at the lower end of the furnace front arc-shaped water guide cover (7), and a furnace rear arc-shaped water guide cover water outlet (10) is arranged at the lower end of the closed furnace rear arc-shaped water guide cover (8). 0), a row of furnace front water spray ports (5) are arranged in the furnace front arc-shaped water guide cover (7), and a row of furnace rear water spray ports (6) are arranged in the furnace rear arc-shaped water guide cover (8); a furnace front saturated steam filter water membrane box enclosing frame (11) is arranged on the steam filter plate (15) on one side of the isolation plate (3), and a furnace rear saturated steam filter water membrane box enclosing frame (12) is arranged on the steam filter plate (15) on the other side of the isolation plate (3); a furnace front arc-shaped water guide cover water outlet (9) is arranged above the furnace front saturated steam filter water membrane box enclosing frame (11), and a furnace rear arc-shaped water guide cover water outlet (10) is arranged above the steam filter water membrane box enclosing frame (12).

2. The saturated steam cleaning mechanism in the drum of an ultra-high pressure circulating fluidized bed boiler according to claim 1, characterized in that: A hot water supply water diversion pipe (14) is arranged on the hot water supply pipe (13), and a water outlet of the hot water supply water diversion pipe (14) is arranged in the boiler water in the boiler drum (1) below the steam filter plate (15).

3. The saturated steam cleaning mechanism in the drum of an ultra-high pressure circulating fluidized bed boiler according to claim 1 or 2, characterized in that: A steam cleaning water film is provided on the steam filter plate (15) in the closed frame (11) of the saturated steam filter water film box in front of the furnace, and a steam cleaning water film is provided on the steam filter plate (15) in the closed frame (12) of the steam filter water film box.

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