Air supply device for improving powder supply efficiency of boiler of power plant

Abstract

The utility model relates to an air supply device for improving powder supply efficiency of a power plant boiler, and belongs to the technical field of boiler air supply systems. Comprising a tertiary air pipeline, and the tertiary air pipeline comprises a first-stage tertiary air pipeline, a second-stage tertiary air pipeline and a third-stage tertiary air pipeline; a plurality of first-stage tertiary air pipelines which are arranged in parallel are combined and connected into a second-stage tertiary air pipeline; the two second-stage tertiary air pipelines are connected into the third-stage tertiary air pipeline through a tee joint; the third-stage tertiary air pipeline is connected with the distribution air box through a square inscribed circle; an air distribution plate is arranged in the air distribution box, a plurality of air distribution openings are formed in the air distribution plate, and each air distribution opening is connected with a primary air pipeline; the primary air pipeline is connected with the boiler; and the first-stage tertiary air pipeline is provided with a baffle door. The tertiary air supply system and the primary air supply system are improved, an original tertiary air pipeline is modified and then distributed to the air distribution box, then the primary air pipeline is redistributed and supplemented, and the problems that the utilization efficiency of a boiler is low, and flue gas emission does not reach the standard are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler air supply systems, in particular to an air supply device for improving the powder supply efficiency of a power plant boiler. Background Art

[0002] Power plant boilers, also known as "power plant boilers," are medium-to-large boilers used to provide a specified quantity and quality of steam to the steam turbines in a power plant. As one of the key thermal equipment in a thermal power plant, they are often paired with steam turbine generator sets. They are primarily used for power generation, but in some special cases, they can also be used for external heat supply. They typically have a high evaporation rate and high steam parameters (steam temperature and pressure). They require a comprehensive suite of auxiliary equipment and are equipped with multi-chamber furnaces. They utilize forced ventilation and can burn a variety of fuels (pulverized coal, crude oil or heavy oil, blast furnace gas, or coke oven gas). While complex in structure, they offer high efficiency, typically reaching around 85% to 93%. These systems place considerable demands on operational management, mechanization, and automatic control technology.

[0003] Tertiary air refers to the exhaust gas introduced into the furnace through specialized nozzles in a silo-type pulverizing system using hot air delivery. It is used to generate heat by burning the remaining unseparated pulverized coal. Tertiary air is typically located above the burners at the four corners of the furnace, utilizing this remaining pulverized coal to generate heat.

[0004] During boiler operation, especially under low-load conditions, the secondary air and primary air compete with each other, resulting in low primary air pressure (wind speed). In order to increase the primary air speed, the secondary air door can only be closed or the blower speed can be increased, which leads to incomplete combustion of pulverized coal or waste of electricity, and thus leads to low boiler utilization efficiency and substandard flue gas emissions. Utility Model Content

[0005] To address the problems of low boiler utilization efficiency and substandard flue gas emissions in existing technologies, the present invention provides an air supply device that improves the pulverized gas delivery efficiency of power plant boilers to solve these problems. This device improves both the tertiary and primary air supply systems, remodeling the original tertiary air ducts and distributing them to air distribution boxes, which are then redistributed to supplement the primary air ducts. This solves the problems of low boiler utilization efficiency and substandard flue gas emissions.

[0006] The technical solution of the utility model is as follows:

[0007] An air supply device for improving the powder delivery efficiency of a power plant boiler comprises a tertiary air duct, wherein the tertiary air duct comprises a first-level tertiary air duct, a second-level tertiary air duct and a third-level tertiary air duct; a plurality of first-level tertiary air ducts arranged in parallel are merged and connected to the second-level tertiary air duct; there are two second-level tertiary air ducts, which are connected to the third-level tertiary air duct through a tee; the third-level tertiary air duct is connected to a distribution air box through a square-to-circle connection; an air distribution plate is provided in the distribution air box, and a plurality of air distribution ports are provided on the air distribution plate, each of which is respectively connected to a primary air duct; the primary air duct is connected to the boiler; and the first-level tertiary air ducts are all provided with baffle doors.

[0008] Furthermore, the baffle door is an electric baffle door, which can adjust the opening and closing of the plug-in door according to the airflow.

[0009] Furthermore, a plug-in door is provided at the connection between the secondary tertiary air duct and the tee.

[0010] Furthermore, the plug-in door is an electric plug-in door.

[0011] Furthermore, the air distribution outlets are symmetrically arranged in two rows on the air distribution plate, and the number of the air distribution outlets is set to four, six or eight.

[0012] Furthermore, an explosion-proof door is provided at the connection between the first-level tertiary air duct and the second-level tertiary air duct.

[0013] Furthermore, the power plant boiler air supply device is installed on the concrete platform through fixing parts.

[0014] The beneficial effects of the present invention are:

[0015] The utility model improves the tertiary air supply system and the primary air supply system, merges the original tertiary air ducts step by step, increases the air volume of the primary air, and connects the modified tertiary air ducts to the air distribution box, redistributes the merged tertiary air to supplement the primary air duct, solves the problems of low boiler utilization efficiency and substandard flue gas emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] Figure 2 This is a structural diagram of another direction of the utility model.

[0019] Figure 3 It is a structural diagram of the distribution bellows part.

[0020] In the figure, 1-primary air duct, 2-first-level tertiary air duct, 3-second-level tertiary air duct, 4-third-level tertiary air duct, 5-square to circle, 6-distribution bellows, 7-air distribution plate, 8-air distribution outlet, 9-baffle door, 10-plug-in door, 11-explosion-proof door, 12-fixing parts, 13-tee. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0022] Example 1

[0023] An air supply device for improving the powder delivery efficiency of a power plant boiler includes a tertiary air duct, wherein the tertiary air duct includes a first-level tertiary air duct 2, a second-level tertiary air duct 3 and a third-level tertiary air duct 4; multiple first-level tertiary air ducts 2 arranged in parallel are merged and connected to the second-level tertiary air duct 3; there are two second-level tertiary air ducts 3, which are connected to the third-level tertiary air duct 4 through a tee 13; the third-level tertiary air duct 4 is connected to a distribution air box 6 through a square-to-circle 5; an air distribution plate 7 is provided in the distribution air box 6, and the air distribution plate 7 is provided with eight air distribution ports 8, each of which is respectively connected to a primary air duct 1; the primary air duct 1 is connected to a boiler; the first-level tertiary air ducts 2 are each provided with a baffle door 9.

[0024] Example 2

[0025] An air supply device for improving the pulverized coal feeding efficiency of a power plant boiler comprises a tertiary air duct, wherein the tertiary air duct comprises a primary tertiary air duct 2, a secondary tertiary air duct 3 and a tertiary tertiary air duct 4; a plurality of primary tertiary air ducts 2 arranged in parallel are merged and connected to the secondary tertiary air duct 3; there are two secondary tertiary air ducts 3, which are connected to the tertiary tertiary air duct 4 through a tee 13, and a plug-in door 10 is provided at the connection between the secondary tertiary air duct 3 and the tee 13, and the plug-in door 10 is an electric plug-in door; the tertiary tertiary air duct 4 is connected to the tertiary tertiary air duct 4 through a square connecting circle 5. The distribution air box 6 is connected; an air distribution plate 7 is provided in the distribution air box 6, and the air distribution plate 7 is provided with eight air distribution ports 8, and the air distribution ports 8 are symmetrically arranged in two rows on the air distribution plate 7, and each air distribution port 8 is respectively connected to the primary air duct 1; the primary air duct 1 is connected to the boiler; the first-level and third-level air ducts 2 are provided with baffle doors 9, and the baffle doors 9 are electric baffle doors. An explosion-proof door 11 is provided at the connection between the first-level and third-level air ducts 2 and the second-level and third-level air ducts 3, and the power plant boiler air supply device is installed on a concrete platform through a fixing part 12.

[0026] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall fall within the scope of the present invention. Any changes or substitutions that can be easily conceived by persons skilled in the art within the technical scope disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. An air supply device for improving the pulverized coal feeding efficiency of a power plant boiler, comprising a tertiary air duct, wherein the tertiary air duct comprises a first-level tertiary air duct, a second-level tertiary air duct, and a third-level tertiary air duct; characterized in that: Multiple first-level tertiary air ducts arranged in parallel are merged and connected to the second-level tertiary air duct; there are two second-level tertiary air ducts, which are connected to the third-level tertiary air duct through a tee; the third-level tertiary air duct is connected to the distribution air box through a square-to-circle connection; the distribution air box is provided with an air distribution plate, and the air distribution plate is provided with multiple air distribution ports, each air distribution port is connected to the primary air duct respectively; the primary air duct is connected to the boiler; the first-level tertiary air ducts are all provided with baffle doors.

2. The air supply device for improving the pulverized dust feeding efficiency of a power plant boiler according to claim 1, characterized in that: The baffle door is an electric baffle door.

3. The air supply device for improving the pulverized dust feeding efficiency of a power plant boiler according to claim 1, characterized in that: A plug-in door is provided at the connection between the secondary tertiary air duct and the tee.

4. The air supply device for improving the pulverized dust feeding efficiency of a power plant boiler according to claim 3, characterized in that: The plug-in door is an electric plug-in door.

5. The air supply device for improving the pulverized dust feeding efficiency of a power plant boiler according to claim 1, characterized in that: The air distribution openings are symmetrically arranged in two rows on the air distribution plate, and the number of the air distribution openings is set to four, six or eight.

6. The air supply device for improving the pulverized dust feeding efficiency of a power plant boiler according to claim 1, characterized in that: An explosion-proof door is provided at the connection between the first-level tertiary air duct and the second-level tertiary air duct.

7. The air supply device for improving the pulverized dust feeding efficiency of a power plant boiler according to claim 1, characterized in that: The boiler air supply device of the power plant is installed on the concrete platform through fixing parts.

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