A boiler air preheater water washing and sewage discharge device and boiler system

Abstract

The embodiment of the present invention provides a boiler air preheater water washing and drainage device and a boiler system, which relate to the field of boilers. The boiler air preheater water washing and drainage device is used to discharge the slurry water in two adjacent air preheaters of a boiler, wherein the two adjacent air preheaters are respectively a first air preheater and a second air preheater; the boiler air preheater water washing and drainage device includes a plurality of first slurry drainage branch pipes for discharging the slurry water in the first air preheater, a plurality of second slurry drainage branch pipes for discharging the slurry water in the second air preheater, a collecting branch pipe for collecting the plurality of first slurry drainage branch pipes and the plurality of second slurry drainage branch pipes, and a collecting main pipe for transporting the collected slurry water; the collecting branch pipe is connected to the plurality of first slurry drainage branch pipes and the plurality of second slurry drainage branch pipes, and the collecting branch pipe is connected to the inlet of the collecting main pipe, and the output end of the collecting main pipe is located at the inlet of the slurry pool, and is output to the slurry pool through the collecting main pipe, which can prevent the slurry water from affecting the on-site environmental sanitation.

Description

Technical Field

[0001] The present invention relates to the field of boiler equipment, and in particular to a boiler air preheater water washing and sewage discharge device and a boiler system. Background Art

[0002] An air preheater, also known as an air preheater, is a heat exchanger that utilizes the heat from exhaust gases from boilers and other equipment for preheating. Its function is to reduce the exhaust gas temperature of boilers and other equipment, improving thermal efficiency, facilitating fuel ignition, stabilizing combustion, and enhancing combustion efficiency. Air preheaters are primarily used in coal-fired power plant boilers and can be categorized as either box-tube or rotary types. Rotary types are further divided into hood rotary and heating surface rotary types. Heating surface rotary preheaters are more commonly used in power plant boilers. They are typically used in two-, three-, or four-compartment types, with the four-compartment type being the most common in circulating fluidized bed boilers.

[0003] Air preheaters are critical heat exchange equipment in coal-fired power plants. To improve heat transfer efficiency, their heat storage elements require regular high-pressure water flushing to remove internal ash deposits and reduce resistance in the air and smoke system. Previously, the slurry water from high-pressure water washing in the air preheater was typically discharged directly to the boiler's zero meter, impacting on-site environmental hygiene. Furthermore, the original discharge main was arranged horizontally, where slurry accumulation could easily lead to blockage.

[0004] In view of this, this application is filed. Summary of the Invention

[0005] The present invention provides a boiler air preheater water washing and sewage discharge device and a boiler system, which can discharge slurry water after air preheater water washing into a slurry pool, thereby avoiding pollution to the environment.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a boiler air preheater water washing and drainage device for discharging slurry water from two adjacent air preheaters of a boiler, wherein the two adjacent air preheaters are respectively a first air preheater and a second air preheater;

[0008] The boiler air preheater water washing and slurry discharge device includes a plurality of first slurry discharge branch pipes for discharging slurry water in the first air preheater, a plurality of second slurry discharge branch pipes for discharging slurry water in the second air preheater, a collecting branch pipe for collecting the plurality of first slurry discharge branch pipes and the plurality of second slurry discharge branch pipes, and a collecting main pipe for transporting the collected slurry water;

[0009] The collecting branch pipe is connected with a plurality of first row slurry branch pipes and a plurality of second row slurry branch pipes, and the collecting branch pipe is connected with the inlet of the collecting main pipe. The output end of the collecting main pipe is located at the inlet of the slurry pool.

[0010] In an optional embodiment, multiple first slurry row branch pipes and multiple second slurry row branch pipes extend from top to bottom, and the collecting branch pipe includes a first collecting branch pipe and a second collecting branch pipe. The first collecting branch pipe is connected to the outlets of some of the first slurry row branch pipes, and the second collecting branch pipe is connected to the outlets of all the second slurry row branch pipes and the remaining first slurry row branch pipes. The outlet ends of the first collecting branch pipe and the second collecting branch pipe are both connected to the inlet of the collecting main pipe.

[0011] In an optional embodiment, the first collecting branch pipe is inclined downwardly toward the direction close to the second air preheater, and the second collecting branch pipe is inclined downwardly toward the direction close to the first air preheater.

[0012] In an optional embodiment, the collecting main pipe includes a first collecting main pipe and a second collecting main pipe, both of which are arranged to be inclined downward, the inlet of the first collecting main pipe is connected to the outlet of the first collecting branch pipe and the second collecting branch pipe, the outlet of the first collecting main pipe is connected to the inlet of the second collecting main pipe, and the outlet end of the second collecting main pipe is located at the inlet of the slurry pool.

[0013] In an optional embodiment, the length of the first collecting manifold is shorter than the length of the second collecting manifold.

[0014] In an optional embodiment, the first collecting main pipe and the second collecting main pipe are connected by flanges, and a hand hole door is installed near the flange on the second collecting main pipe.

[0015] In an optional embodiment, a maintenance platform for repairing the second collecting main pipe is further included.

[0016] In an optional embodiment, there are four slurry branch pipes in the first row and four slurry branch pipes in the second row, three of which extend in a vertical direction, and the middle branch pipe extends downward in a bent shape.

[0017] In the second aspect, the present invention provides a boiler system, including a slurry pool and an air preheater, and two adjacent air preheaters of a boiler are each provided with a boiler air preheater water washing and sewage discharge device according to any one of the aforementioned embodiments, and the output end of the collecting main pipe is located at the inlet of the slurry pool.

[0018] In an optional embodiment, a slurry pump and a thickener are further included, wherein the slurry pump is used to transport the slurry in the slurry pool to the thickener.

[0019] The beneficial effects of the embodiments of the present invention are as follows: the slurry water in the first air preheater is discharged through multiple first slurry discharge branch pipes, the slurry water in the second air preheater is discharged through multiple second slurry discharge branch pipes, the slurry water in the multiple first slurry discharge branch pipes and the multiple second slurry discharge branch pipes are collected through the collecting branch pipes, and output to the slurry pool through the collecting main pipe, which can prevent the slurry water from affecting the on-site environmental hygiene. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic structural diagram of a water washing and sewage discharge device for a boiler air preheater is provided for an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the slurry discharge arrangement of the air preheater;

[0023] Figure 3 This is a schematic diagram of the pipeline layout leading from the air preheater discharge pipe to the slurry pool.

[0024] Icons: 100- boiler air preheater water washing and sewage discharge device; 001- first air preheater; 002- second air preheater; 003- slurry pool; 004- channel platform; 006- flange; 007- first lifting point; 008- second lifting point; 009- third lifting point; 110- first slurry discharge branch pipe; 120- second slurry discharge branch pipe; 130- collecting branch pipe; 131- first collecting branch pipe; 132- second collecting branch pipe; 140- collecting main pipe; 141- first collecting main pipe; 142- second collecting main pipe; 150- maintenance platform. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0028] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the invention is usually placed when in use. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0029] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0030] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0031] Please refer to Figure 1 and Figure 2 The present embodiment provides a boiler air preheater water washing and sewage discharge device 100, which is used to discharge the slurry water in two adjacent air preheaters, the two adjacent air preheaters being the first air preheater 001 and the second air preheater 002; the boiler air preheater water washing and sewage discharge device 100 includes a plurality of first slurry discharge branch pipes 110 for discharging the slurry water in the first air preheater 001, a plurality of second slurry discharge branch pipes 120 for discharging the slurry water in the second air preheater 002, a collecting branch pipe 130 for collecting the plurality of first slurry discharge branch pipes 110 and the plurality of second slurry discharge branch pipes 120, and a collecting main pipe 140 for transporting the collected slurry water.

[0032] Specifically, the collecting branch pipe 130 is connected to multiple first pulp discharge branch pipes 110 and multiple second pulp discharge branch pipes 120, and the collecting branch pipe 130 is connected to the inlet of the collecting main pipe 140. The output end of the collecting main pipe 140 is located at the inlet of the slurry pool 003.

[0033] It should be noted that the boiler air preheater water washing and sewage discharge device 100 discharges the slurry water in the first air preheater 001 through multiple first slurry discharge branch pipes 110, and discharges the slurry water in the second air preheater 002 through multiple second slurry discharge branch pipes 120. The slurry water in the multiple first slurry discharge branch pipes 110 and the multiple second slurry discharge branch pipes 120 are collected through the collecting branch pipe 130, and output to the slurry pool 003 through the collecting main pipe 140, which can prevent the slurry water from affecting the on-site environmental hygiene.

[0034] In some embodiments, multiple first pulp discharge pipes 110 and multiple second pulp discharge pipes 120 extend from top to bottom, and the collecting pipe 130 includes a first collecting pipe 131 and a second collecting pipe 132. The first collecting pipe 131 is connected to the outlets of some first pulp discharge pipes 110, and the second collecting pipe 132 is connected to the outlets of all second pulp discharge pipes 120 and the remaining first pulp discharge pipes 110. The outlet ends of the first collecting pipe 131 and the second collecting pipe 132 are both connected to the inlet of the collecting main pipe 140. Figure 1 and Figure 2 As shown, the first collecting branch pipe 131 can connect the two first pulp discharge branch pipes 110, and the second collecting branch pipe 132 can connect the outlets of all the second pulp discharge branch pipes 120 and the remaining first pulp discharge branch pipes 110. The outlets of the first collecting branch pipe 131 and the second collecting branch pipe 132 are collected together and connected to the inlet of the collecting main pipe 140.

[0035] In some embodiments, the first collecting branch pipe 131 is inclined downward toward the second air preheater 002, and the second collecting branch pipe 132 is inclined downward toward the first air preheater 001, so that the downstream rate of the slurry water will not be too fast and it will be slowly transported to the collecting main pipe 140.

[0036] In some embodiments, the collecting main pipe 140 includes a first collecting main pipe 141 and a second collecting main pipe 142. The first collecting main pipe 141 and the second collecting main pipe 142 are both arranged to be inclined downward. The inlet of the first collecting main pipe 141 is connected to the outlets of the first collecting branch pipe 131 and the second collecting branch pipe 132. The outlet of the first collecting main pipe 141 is connected to the inlet of the second collecting main pipe 142. The outlet end of the second collecting main pipe 142 is located at the inlet of the slurry tank 003. The length of the first collecting main pipe 141 is shorter than that of the second collecting main pipe 142.

[0037] Specifically, the first collecting main pipe 141 is a short pipe, and the second collecting main pipe 142 is a long pipe leading to the main pipe of the slurry pool. The inclination directions of the first collecting main pipe 141 and the second collecting main pipe 142 can be opposite, such as Figure 1 The length of the second collecting main pipe 142 is much greater than that of the first collecting main pipe 141, and can be 10 times, 20 times, etc., the length of the first collecting main pipe 141, which is not specifically limited here.

[0038] In some embodiments, the first collecting main pipe 141 and the second collecting main pipe 142 are connected by flanges. During normal operation, a blocking plate is installed between the two flange surfaces. A hand hole door (400×250) is installed near the flange of the second collecting main pipe 142 to facilitate flushing.

[0039] In some embodiments, there are four first slurry discharge branch pipes 110 and four second slurry discharge branch pipes 120 (φ273), three of which extend vertically, and the middle branch pipe extends downward in a bent shape, which conforms to the structure of the original slurry discharge pipeline of the air preheater.

[0040] In other embodiments, the number of the first pulp discharge pipes 110 and the second pulp discharge pipes 120 may be 3, 5, 6, 7, etc., which is not limited here.

[0041] In some embodiments, please refer to Figure 3 The boiler air preheater water wash and blowdown device 100 also includes an inspection platform 150 for accessing the second collecting main pipe 142, facilitating inspection and maintenance. This new inspection platform 150 is coplanar with the existing access platform 004 and extends toward the furnace, embracing the existing access. The platform measures 1m x 1m. The pipeline is also equipped with a flange 006 (for mounting a blocking plate), a first hanging point 007, a second hanging point 008, and a third hanging point 009.

[0042] The following is a brief description of the formation process of the boiler air preheater water washing and sewage discharge device 100 provided in the embodiment of the present invention:

[0043] The boiler air preheater water washing and sewage discharge device 100 provided in the embodiment of the present invention can be modified on the original structure, making the most of the original structure. Figure 1 and Figure 2 As shown in , the solid line is the original structure and the dotted line is the added structure.

[0044] The existing slurry discharge pipes (four, φ273) for each air preheater remain in place, and the existing handholes on the pipes are retained. Construction begins below them. The existing slurry discharge pipes on the first air preheater are partially extended, and the existing slurry discharge pipes on the second air preheater are directly connected to the second collecting branch pipe 132. The second collecting branch pipe 132 is used to intercept a portion of the slurry discharge pipe, and the lower portion is no longer used.

[0045] also, Figure 2 Handhole doors (400×250) are installed on the second air preheater discharge main pipe on the left side of the middle, near the discharge collection point of the two air preheaters, and on the first air preheater discharge main pipe on the right side, near the discharge collection point of the two air preheaters, to facilitate cleaning of the pipes when they are blocked. The new slurry collection main pipe of each furnace air preheater is supported by the support brackets installed at the original position, and the length can be readjusted. The second collection main pipe 142 leading to the slurry pool is suspended and supported by the steel beams near the area it passes through. A new maintenance platform is built at the installation and removal of the blocking plate of each furnace, and the platform also takes into account the maintenance of the handholes on the flange surface. The new maintenance platform is installed at the original platform, sinking towards the front of the furnace. Its main load-bearing capacity is borne by the top of the collection main pipe. The platform size is 3m×1m.

[0046] In the second aspect, an embodiment of the present invention also provides a boiler system, including a slurry pool 003 and an air preheater, and a boiler air preheater water washing and sewage discharge device 100 of any one of the aforementioned embodiments is provided on two adjacent air preheaters, and the output end of the collecting main pipe 140 is located at the inlet of the slurry pool 003.

[0047] In some embodiments, the boiler system further includes a slurry pump and a thickener (not shown). The slurry pump is used to transport the slurry in the slurry pool 003 to the thickener for further processing of the slurry.

[0048] Specifically, a slurry pump is a centrifugal pump in terms of its operating principle. Conceptually, it refers to a machine that increases the energy of a solid-liquid mixture by utilizing centrifugal force (the rotation of the pump's impeller), converting electrical energy into the kinetic and potential energy of the medium. In this embodiment of the present invention, an existing slurry pump is used to transport the slurry from slurry tank 003 to a thickener for further processing and utilization.

[0049] Specifically, the concentrator (high-efficiency concentrator) is an existing device, which is generally mainly composed of a concentrating tank, a cake rack, a transmission device, a cake rack lifting device, a feeding device, a unloading device and a signal safety device.

[0050] In summary, the embodiments of the present invention provide a boiler air preheater water washing and sewage discharge device and a boiler system, which discharges the slurry water in the first air preheater through multiple first slurry discharge branch pipes, discharges the slurry water in the second air preheater through multiple second slurry discharge branch pipes, and collects the slurry water in the multiple first slurry discharge branch pipes and the multiple second slurry discharge branch pipes through the collecting branch pipe, and outputs it to the slurry pool through the collecting main pipe, which can prevent the impact of slurry water on on-site environmental hygiene.

[0051] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A water washing and sewage discharge device for a boiler air preheater, characterized in that: It is used to discharge the slurry water in two adjacent air preheaters of a boiler, the two adjacent air preheaters are the first air preheater and the second air preheater respectively; The boiler air preheater water washing and sewage discharge device includes a plurality of first slurry discharge branch pipes for discharging slurry water in the first air preheater, a plurality of second slurry discharge branch pipes for discharging slurry water in the second air preheater, a collecting branch pipe for collecting the plurality of first slurry discharge branch pipes and the plurality of second slurry discharge branch pipes, and a collecting main pipe for transporting the collected slurry water; The collecting branch pipe is connected to the plurality of the first slurry discharge branch pipes and the plurality of the second slurry discharge branch pipes, and the collecting branch pipe is connected to the inlet of the collecting main pipe, and the output end of the collecting main pipe is located at the inlet of the slurry tank; The plurality of first-row slurry branch pipes and the plurality of second-row slurry branch pipes all extend from top to bottom, and the collecting branch pipe includes a first collecting branch pipe and a second collecting branch pipe, the first collecting branch pipe is connected to the outlets of some of the first-row slurry branch pipes, the second collecting branch pipe is connected to the outlets of all the second-row slurry branch pipes and the remaining first-row slurry branch pipes, and the outlet ends of the first collecting branch pipe and the second collecting branch pipe are both connected to the inlet of the collecting main pipe; The first collecting branch pipe is inclined downwardly in the direction close to the second air preheater, and the second collecting branch pipe is inclined downwardly in the direction close to the first air preheater; the collecting main pipe includes a first collecting main pipe and a second collecting main pipe, and the first collecting main pipe and the second collecting main pipe are both arranged to be inclined downwardly, the inlet of the first collecting main pipe is connected with the outlets of the first collecting branch pipe and the second collecting branch pipe, the outlet of the first collecting main pipe is connected with the inlet of the second collecting main pipe, and the outlet end of the second collecting main pipe is located at the inlet of the slurry pool; the length of the first collecting main pipe is less than that of the second collecting main pipe.

2. The boiler air preheater water washing and sewage discharge device according to claim 1, characterized in that: The first collecting main pipe and the second collecting main pipe are connected by flanges, and a hand hole door is installed near the flange of the second collecting main pipe.

3. The boiler air preheater water washing and sewage discharge device according to claim 1, characterized in that: It also includes a maintenance platform for repairing the second collecting main pipe.

4. The boiler air preheater water washing and sewage discharge device according to claim 1, characterized in that: There are four slurry branch pipes in the first row and four slurry branch pipes in the second row, three of which extend in a vertical direction, and the middle branch pipe extends downward in a bent shape.

5. A boiler system, characterized in that: It comprises a slurry pool and an air preheater, and two adjacent air preheaters are each provided with a boiler air preheater water washing and sewage discharge device according to any one of claims 1 to 4, and the output end of the collecting main pipe is located at the inlet of the slurry pool.

6. The boiler system according to claim 5, characterized in that The system also includes a slurry pump and a thickener. The slurry pump is used to transport the slurry in the slurry pool to the thickener.

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