Novel economizer recirculation system

Abstract

The utility model relates to an economizer recirculation system, and belongs to the field of steam boilers. The coal economizer comprises a first-stage coal economizer, a coal economizer connecting pipe, a second-stage coal economizer, a coal economizer outlet pipeline, a boiler barrel, a coal economizer recirculation pipe main pipe, a first coal economizer recirculation branch pipe, a second coal economizer recirculation branch pipe and a third coal economizer recirculation branch pipe, and the outlet end of the first-stage coal economizer is connected with the inlet end of the second-stage coal economizer through the coal economizer connecting pipe. The outlet end of the second-stage economizer is connected with the inlet end of the boiler barrel through an economizer outlet pipeline; an economizer recirculation branch pipe I is arranged between the economizer recirculation pipe main pipe and the second-stage economizer; the outlet end of the boiler barrel is connected with the inlet end of the primary economizer through an economizer recirculation main pipe and an economizer recirculation branch pipe II, and an economizer recirculation branch pipe III is arranged between an economizer connecting pipe and an economizer outlet pipeline. The system is simple and reasonable in design, safe and reliable, and meets the use requirements of the recirculation pipe when the economizer is unconventionally arranged.

Description

Technical Field

[0001] The utility model relates to a circulation system, in particular to an economizer recirculation system, and belongs to the field of steam boilers. Background Art

[0002] For drum boilers, in order to ensure the safety of the economizer during the start-up and shutdown process, a recirculation pipe should be installed to ensure that there is medium flowing in the economizer, thereby effectively cooling the economizer and preventing the economizer from dry burning and overheating and causing tube burst.

[0003] Generally, the medium of the economizer flows from bottom to top and in countercurrent (i.e., the flue gas flow direction is opposite to the medium flow direction in the economizer) to enter the drum, and the economizer recirculation pipe is a pipe from the drum to the economizer inlet header. However, when the economizer is provided with two stages, both of which are countercurrent, the medium of the first economizer flows from bottom to top, and the medium of the second economizer flows from top to bottom, and then enters the steam drum, the economizer recirculation pipe cannot be arranged conventionally at this time, and the economizer recirculation system of the utility model needs to be used. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide an economizer recirculation system which has a simple and reasonable structural design, is safe and reliable, and has an arrangement that meets the use requirements.

[0005] The technical solution adopted by the utility model to solve the above-mentioned problem is: the new economizer recirculation system includes a boiler feed water pipeline, a first-level economizer, an economizer connecting pipe, a second-level economizer, an economizer outlet pipeline and a boiler drum, the boiler feed water pipeline is connected to the first-level economizer, the outlet end of the first-level economizer is connected to the inlet end of the second-level economizer through the economizer connecting pipe, and the outlet end of the second-level economizer is connected to the inlet end of the boiler drum through the economizer outlet pipeline, and is characterized in that: it also includes an economizer recirculation pipe main pipe, an economizer recirculation branch pipe 1, an economizer recirculation branch pipe 2 and an economizer recirculation branch pipe 3, an economizer recirculation branch pipe 1 is arranged between the economizer recirculation pipe main pipe and the second-level economizer; the outlet end of the boiler drum is connected to the inlet end of the first-level economizer through the economizer recirculation pipe main pipe and the economizer recirculation branch pipe 2, and an economizer recirculation branch pipe 3 is arranged between the economizer connecting pipe and the economizer outlet pipe.

[0006] Preferably, the utility model further comprises a stop valve, which comprises a manual stop valve and an electric stop valve, and the manual stop valve is in a long-open state.

[0007] Preferably, the economizer recirculation pipe main pipe of the utility model is provided with a manual stop valve, and the economizer recirculation branch pipe 1 and the economizer recirculation branch pipe 3 are provided with electric stop valves.

[0008] Preferably, the first-level economizer of the utility model is provided with a first-level economizer inlet header and a first-level economizer outlet header; the second-level economizer is provided with a second-level economizer inlet header and a second-level economizer outlet header.

[0009] Preferably, the economizer outlet pipe of the utility model comprises economizer outlet pipe 1 and economizer outlet pipe 2 which are connected.

[0010] Compared with the prior art, the utility model has the following advantages and effects: 1) The overall structural design is simple and reasonable, safe and reliable, and can solve the arrangement of the economizer recirculation pipe when the flow direction of the economizer medium is not always from bottom to top to the boiler drum; 2) During the start and stop of the boiler drum, the economizer recirculation pipe can supply water for cooling to multiple stages of economizers at the same time; 3) Electric valves are arranged on the economizer recirculation pipeline, which can be remotely operated in the control room. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0012] In the figure: boiler feed water pipe 1, first-level economizer 2, economizer connecting pipe 3, second-level economizer 4, economizer outlet pipe 5a5b, boiler drum 6, economizer recirculation pipe main pipe 7, economizer recirculation branch pipe one 8, economizer recirculation branch pipe two 9, economizer recirculation branch pipe three 10, stop valve 11; first-level economizer inlet header 21, first-level economizer outlet header 22; second-level economizer inlet header 41, second-level economizer outlet header 42; economizer outlet pipe one 5a, economizer outlet pipe two 5b, manual stop valve 11a, electric stop valve 11b. DETAILED DESCRIPTION

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0014] Example

[0015] See also Figure 1The novel economizer recirculation system of the present embodiment includes a boiler feed water pipeline 1, a primary economizer 2, an economizer connecting pipe 3, a secondary economizer 4, an economizer outlet pipeline 5, a boiler drum 6, an economizer recirculation pipe main pipe 7, an economizer recirculation branch pipe 1 8, an economizer recirculation branch pipe 2 9 and an economizer recirculation branch pipe 3 10. The boiler feed water pipeline 1 is connected to the primary economizer 2, the outlet end of the primary economizer 2 is connected to the inlet end of the secondary economizer 4 through the economizer connecting pipe 3, the outlet end of the secondary economizer 4 is connected to the inlet end of the boiler drum 6 through the economizer outlet pipeline 5, an economizer recirculation branch pipe 1 8 is arranged between the economizer recirculation pipe main pipe 7 and the secondary economizer 4; the outlet end of the boiler drum 6 is connected to the inlet end of the primary economizer 2 through the economizer recirculation pipe main pipe 7 and the economizer recirculation branch pipe 2 9, and an economizer recirculation branch pipe 3 10 is arranged between the economizer connecting pipe 3 and the economizer outlet pipeline 5.

[0016] In this embodiment, the stop valve 11 includes a manual stop valve 11 a and an electric stop valve 11 b , and the manual stop valve 11 a is in a long-open state.

[0017] In this embodiment, a manual stop valve 11a is provided on the economizer recirculation pipe main pipe 7, and an electric stop valve 11b is provided on the economizer recirculation branch pipe 1 8 and the economizer recirculation branch pipe 3 10.

[0018] In this embodiment, the primary economizer 2 is provided with a primary economizer inlet header 21 and a primary economizer outlet header 22 ; the secondary economizer 4 is provided with a secondary economizer inlet header 41 and a secondary economizer outlet header 42 .

[0019] In this embodiment, the economizer outlet pipe 5 includes a connected economizer outlet pipe 1 5a and an economizer outlet pipe 2 5b.

[0020] The process of using this embodiment is as follows: when the boiler is operating normally, all the electric stop valves 11b are closed, and the medium flow is: boiler feed water pipe 1→first-stage economizer 2→economizer connecting pipe 3→second-stage economizer 4→economizer outlet pipe 1 5a, economizer outlet pipe 2 5b→boiler drum 6.

[0021] During the boiler startup process and shutdown period, in order to protect the economizer, the economizer recirculation system is started. At this time, the electric stop valve 11b is fully opened, and the medium flow is:

[0022]

[0023] At this time, the boiler water in the boiler circulates in the economizer to absorb heat, which reduces the temperature of the economizer and plays a role in protecting the economizer.

[0024] When this embodiment is used, a manual stop valve 11a and an electric stop valve 11b are used, wherein the manual stop valve 11a is always open, and the opening and closing of the economizer recirculation system is remotely controlled by switching the electric stop valve 11b.

[0025] Through the above description, those skilled in the art can already implement it.

[0026] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A novel economizer recirculation system, comprising a boiler feed water pipe (1), a primary economizer (2), an economizer connecting pipe (3), a secondary economizer (4), an economizer outlet pipe (5) and a boiler drum (6), wherein the boiler feed water pipe (1) is connected to the primary economizer (2), the outlet end of the primary economizer (2) is connected to the inlet end of the secondary economizer (4) via the economizer connecting pipe (3), and the outlet end of the secondary economizer (4) is connected to the inlet end of the boiler drum (6) via the economizer outlet pipe (5), characterized in that: It also includes an economizer recirculation pipe main pipe (7), an economizer recirculation branch pipe 1 (8), an economizer recirculation branch pipe 2 (9) and an economizer recirculation branch pipe 3 (10), wherein an economizer recirculation branch pipe 1 (8) is arranged between the economizer recirculation pipe main pipe (7) and the secondary economizer (4); the outlet end of the boiler drum (6) is connected to the inlet end of the primary economizer (2) through the economizer recirculation pipe main pipe (7) and the economizer recirculation branch pipe 2 (9), and an economizer recirculation branch pipe 3 (10) is arranged between the economizer connecting pipe (3) and the economizer outlet pipe (5).

2. The novel economizer recirculation system according to claim 1 is characterized in that: It also comprises a stop valve (11), wherein the stop valve (11) comprises a manual stop valve (11a) and an electric stop valve (11b), and the manual stop valve (11a) is in a long-open state.

3. The novel economizer recirculation system according to claim 2 is characterized in that: The economizer recirculation pipe main pipe (7) is provided with a manual stop valve (11a), and the economizer recirculation branch pipe 1 (8) and the economizer recirculation branch pipe 3 (10) are provided with electric stop valves (11b).

4. The novel economizer recirculation system according to claim 1 is characterized in that: The primary economizer (2) is provided with a primary economizer inlet header (21) and a primary economizer outlet header (22); the secondary economizer (4) is provided with a secondary economizer inlet header (41) and a secondary economizer outlet header (42).

5. The novel economizer recirculation system according to claim 1 is characterized in that: The economizer outlet pipe (5) comprises a connected economizer outlet pipe 1 (5a) and an economizer outlet pipe 2 (5b).

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