Power plant boiler

Abstract

The utility model discloses a power station boiler, it includes: combustion chamber and upper hearth, screen type superheater hoist in the top of upper hearth, high temperature reheater is arranged in horizontal flue, and the low temperature reheater is arranged in the vertical shaft flue, and the low temperature superheater of first side of low temperature reheater and the economizer of low temperature superheater below, wherein, the bottom wall of horizontal flue is provided with the ash cleaning device for the cleaning of the ash of horizontal flue place. The utility model effectively solved the problem of horizontal flue area ash deposition and the abrasion of heating pipeline caused by other ash removal mode, can effectively avoid the non - stop of unit.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of thermal power equipment, and specifically relates to a power station boiler for thermal power generation. BACKGROUND

[0002] The power station boiler, also called "power plant boiler", is a medium-large boiler for providing steam of a specified quantity and quality to a steam turbine in a thermal power plant, and is one of the main thermal power equipment in the thermal power plant.

[0003] The method for preventing ash deposition in the horizontal flue of the power station boiler is generally to use an ash blowing gun to remove the ash deposited on the surface of the heating surface of the horizontal flue. In the ash blowing process, the ash blowing gun is spirally inserted into the boiler from both sides to blow, and this ash blowing method will have an ash blowing blind area, especially on the side of the high-temperature reheater facing away from the screen-type superheater, so that the ash deposited at this position cannot be removed and is deposited more and more, and in severe cases, the generator set will be shut down. SUMMARY

[0004] In order to solve the technical problems existing in the prior art, according to the embodiments of the utility model, a power station boiler for thermal power generation is provided, which can remove the ash on the side of the high-temperature reheater facing away from the screen-type superheater in real time.

[0005] According to an aspect of the embodiments of the utility model, the power station boiler comprises a combustion chamber and an upper furnace, a screen-type superheater is hung at the top of the upper furnace, a high-temperature reheater is arranged in a horizontal flue, a low-temperature reheater, a low-temperature superheater located at the first side of the low-temperature reheater, and an economizer located below the low-temperature superheater are arranged in a vertical flue, and a dust cleaning device for cleaning the ash deposited at the horizontal flue is arranged on the bottom wall of the horizontal flue.

[0006] In one example of the power station boiler provided in the above aspect, the dust cleaning device is arranged at the first side of the high-temperature reheater.

[0007] In one example of the power station boiler provided in the above aspect, the first side of the high-temperature reheater is the side of the high-temperature reheater facing the low-temperature reheater, and the first side of the low-temperature reheater is the side of the low-temperature reheater facing away from the high-temperature reheater.

[0008] In one example of the power station boiler provided in the above aspect, the dust cleaning device comprises a conical hopper and a long neck pipe integrally connected with the tip of the conical hopper.

[0009] In one example of the power station boiler provided in the above aspect, a heavy hammer type automatic rebound air lock is arranged on the long neck pipe.

[0010] Beneficial effects: the utility model effectively solves the problem of ash deposition in horizontal flue area and abrasion of heated pipeline caused by other ash removal methods, can effectively avoid unit non-stop. Further, the utility model does not need to input any power source, realizes automatic ash removal, automatic ash closing and sealing, and does not need to set a positive control system. BRIEF DESCRIPTION OF DRAWINGS

[0011] The above and other aspects, features and advantages of embodiments of the present application will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0012] Figure 1 is a structural schematic view of a power station boiler for a thermal power plant according to an embodiment of the present application;

[0013] Figure 2 is a structural schematic view of an ash removal device according to an embodiment of the present application. DETAILED DESCRIPTION

[0014] Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. However, the present application can be implemented in many different forms, and the present application should not be construed as being limited to the specific embodiments set forth herein. Rather, these embodiments are provided so as to explain the principles of the present application and its practical application, thereby enabling those skilled in the art to understand various embodiments of the present application and various modifications suitable for a specific intended application.

[0015] As used herein, the term "includes" and its variants are meant to be open-ended terms that mean "including, but not limited to". The terms "based on" and "according to" and the like are meant to be open-ended terms that mean "based, at least in part, on". The terms "embodiment", "one example", "one embodiment", and "an embodiment" mean "at least one embodiment". The terms "another embodiment", "another example", "yet another example", "yet another embodiment" mean "at least one other embodiment". The terms "first", "second", and the like can refer to different or identical objects. Other definitions can be included below, whether explicitly or implicitly. Unless the context clearly indicates otherwise, the definition of a term is consistent throughout the specification.

[0016] Here, it also needs to be noted that, in order to avoid the present application being obscured by unnecessary details, only structures and / or processing steps closely related to the scheme according to the present application are shown in the drawings, and other details that are not closely related are omitted.

[0017] Figure 1 is a structural schematic view of a power station boiler for a thermal power plant according to an embodiment of the present application.

[0018] With reference to Figure 1 The power station boiler for thermal power plants according to the embodiment of the present application comprises a combustion chamber 1 and an upper furnace 2 (both constituting a furnace). Fuel is combusted in the combustion chamber 1, and the high-temperature flue gas generated is sequentially flowed through a high-temperature reheater 4 of a horizontal flue after being heat-absorbed by a water-cooled wall (not labeled) arranged around the furnace and a screen-type superheater 3 at the upper portion of the upper furnace 2, and then flowed through a low-temperature reheater 5, a low-temperature superheater 6 and an economizer 7 arranged in a tail shaft flue, and finally discharged to a chimney by an induced draft fan (not shown). In the present embodiment, the low-temperature superheater 6 is located at a first side of the low-temperature reheater 5, and the economizer 7 is located below the low-temperature superheater 6. Here, the first side of the low-temperature reheater 5 is a side of the low-temperature reheater 5 facing away from the high-temperature reheater 4.

[0019] The furnace of the boiler is a semi-open furnace, which is divided into the combustion chamber 1 and the upper furnace 2. In another example, the combustion chamber 1 and the upper furnace 2 can be separated by a waist structure (i.e., the joint between the combustion chamber 1 and the upper furnace 2 is concave into the furnace), and a fire-resistant band (not labeled) is formed by spraying a refractory material on the water-cooled wall of the combustion chamber 1, and an angle flat hearth is used at the bottom of the furnace and is closed, and the combustion chamber is relatively independent due to the waist structure, and the setting of the fire-resistant band ensures the ignition and stable combustion of the fuel, and the secondary mixing of the gas is formed when the gas flows through the waist structure, thereby ensuring the complete combustion of the fuel.

[0020] In another example, the economizer 7 is a two-stage economizer, which can be composed of an upper economizer and a lower economizer, and the upper economizer is arranged between the lower economizer and the low-temperature superheater 6. The upper economizer is a high-boiling economizer, and the lower economizer generates undersaturated boiler water, and a part of which can be sent to the upper economizer to generate a steam-water mixture with a certain boiling degree. The use of the high-boiling economizer makes up for the insufficient evaporation and heat absorption in the boiler due to low fuel calorific value and the like.

[0021] In addition, a soot cleaning device 8 for cleaning the accumulated soot at the horizontal flue is arranged on the bottom wall of the horizontal flue. Preferably, the soot cleaning device 8 is arranged at a first side of the high-temperature reheater 4. Here, the first side of the high-temperature reheater 4 is a side of the high-temperature reheater 4 facing the low-temperature reheater 5, or a side of the high-temperature reheater 4 facing away from the screen-type superheater 3.

[0022] Figure 2 is a structural schematic view of the soot cleaning device according to the embodiment of the present application.

[0023] With reference to Figure 2 The soot cleaning device according to the embodiment of the present application comprises a conical hopper 81 arranged on the bottom wall of the horizontal flue and a long neck pipe 82 integrally connected with the tip of the conical hopper 81. Preferably, a weight-type automatic rebound air lock 83 is arranged on the long neck pipe 82.

[0024] In this case, when the stored ash weight in the conical hopper 81 reaches a certain amount, the weight automatic rebound lock gas device 83 is opened, and the ash is transported to the ash hopper below the economizer of the shaft flue through the ash conveying pipeline. After the ash conveying is completed, the stored ash in the conical hopper 81 is reduced, the hammer automatic rebound lock gas device 83 is closed, the high-temperature flue gas is prevented from directly entering the shaft flue without passing through the rear heat exchange surface of the boiler, and the boiler heat exchange efficiency is ensured.

[0025] In summary, the power station boiler according to the embodiment of the present application effectively solves the problems of horizontal flue area ash deposition and heated pipe wear caused by other ash removal methods, and can effectively avoid unit non-stop. Further, the ash removal device according to the embodiment of the present application does not need to input any power source, realizes automatic ash removal and automatic sealing without ash, and does not need to set a positive control system.

[0026] The optional implementation modes of the embodiments of the present application are described in detail above in combination with the drawings, but the embodiments of the present application are not limited to the specific details in the above implementation modes, and various simple modifications can be made to the technical solutions of the embodiments of the present application within the technical concept range of the embodiments of the present application, and these simple modifications all belong to the protection range of the embodiments of the present application.

Claims

1. A power plant boiler, characterized in that The power plant boiler comprises a combustion chamber and an upper furnace, a platen superheater is hung at the top of the upper furnace, a high-temperature reheater is arranged in a horizontal flue, a low-temperature reheater, a low-temperature superheater located at a first side of the low-temperature reheater and an economizer located below the low-temperature superheater are arranged in a vertical flue, and a soot cleaning device for cleaning soot at the horizontal flue is arranged on a bottom wall of the horizontal flue.

2. A power plant boiler according to claim 1, characterised in that The soot cleaning device is arranged at a first side of the high-temperature reheater.

3. A utility boiler according to claim 2, characterised in that The first side of the high-temperature reheater is a side of the high-temperature reheater facing the low-temperature reheater, and the first side of the low-temperature reheater is a side of the low-temperature reheater facing away from the high-temperature reheater.

4. A utility boiler according to any one of claims 1 to 3, characterised in that The soot cleaning device comprises a conical hopper and a long neck pipe integrally connected with a tip of the conical hopper.

5. A utility boiler according to claim 4, characterised in that A gravity type automatic rebound lock gas device is arranged on the long neck pipe.

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