Coal-fired boiler capable of supplementing secondary air volume

Abstract

The utility model relates to the technical field of coal-fired boilers, in particular to a coal-fired boiler capable of supplementing secondary air volume, which comprises a bearing bottom plate, an air volume component arranged above the bearing bottom plate, a control component arranged above the bearing bottom plate, a boiler component arranged above the bearing bottom plate, a primary air box arranged above the primary air box, a secondary air box arranged above the secondary air box and a secondary air box arranged above the secondary air box. The primary air box is fixedly installed on the upper surface of the bearing bottom plate, and a primary fan bin is fixedly arranged on one side of the primary air box. According to the coal-fired boiler capable of supplementing the secondary air volume, through the installation of the air volume assembly, primary air can be generated through a primary air fan motor and fan blades through cooperation of a primary air box, a primary air fan bin and other components, primary air is conveyed through a primary air pipe, and the primary air pipe is connected with a secondary air box; and therefore, the one-to-two effect can be realized by utilizing the allowance of the primary air without increasing any additional energy consumption, and the improvement of the boiler efficiency is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-fired boilers, in particular to a coal-fired boiler capable of supplementing secondary air volume. Background Art

[0002] The company's thermal power plant uses three sets of 160-ton circulating fluidized bed boilers produced by Wuxi Boiler Factory; they were officially put into operation in 2013 and have been in operation ever since; the auxiliary equipment of a single boiler includes two 186,000m³ / h induced draft fans with 900kw motors, a primary fan with an air volume of 112,000m³ / h with a 900kw motor, and a secondary fan with an air volume of 91,800m³ / h with a 560kw motor; the current operating load of the boiler is basically maintained at around 56%; the primary air efficiency is around 60%, and the secondary air efficiency is around 20%. About; after calculation, when the boiler is running at low load, the primary fan can meet the use of one to two; therefore, a connecting tube is installed at a suitable position of the primary and secondary wind boxes in front of the air preheater, and the distribution of the total primary air volume can be determined through the boiler fluidization test; and the boiler does not need to be shut down when the secondary fan of the boiler is repaired, which effectively protects the air preheater and the secondary air duct from being burned out. Therefore, with the help of the current primary and secondary air systems, research and design are carried out; to achieve simple, easy operation, time-saving, labor-saving, safe and energy-saving design, installation, and test operation. Utility Model Content

[0003] The purpose of the utility model is to provide a coal-fired boiler that can supplement the secondary air volume, so as to solve the problem proposed in the above background technology that the boiler is forced to stop operating due to the lack of secondary air when the secondary air of the boiler is under maintenance; and solve the problem that the boiler is affected by the load of the boiler due to insufficient secondary air. In order to achieve the above purpose, the utility model provides the following technical solutions: a coal-fired boiler that can supplement the secondary air volume, including a bearing bottom plate, an air volume component is arranged above the bearing bottom plate, a control component is arranged above the bearing bottom plate, a boiler component is arranged above the bearing bottom plate, the air volume component includes a primary wind box, the primary wind box is fixedly installed on the upper surface of the bearing bottom plate, a primary fan compartment is fixedly arranged on one side of the primary wind box, a primary fan motor and fan blades are fixedly installed inside the primary fan compartment, and the other side of the primary wind box is fixedly connected to a primary air duct.

[0004] Further preferably, the air volume assembly also includes a secondary air box, the secondary air box is fixedly mounted on the upper surface of the bearing base plate, a secondary air fan compartment is fixedly provided on one side of the secondary air box, a secondary fan motor and fan blades are fixedly mounted inside the secondary fan compartment, the top of the secondary air box is fixedly connected with a secondary air duct, and the primary air duct is fixedly connected to one side of the secondary air box. By installing the air volume assembly, the primary fan motor and fan blades can be used to generate primary air through the cooperation between the primary air box and the primary fan compartment and other components, and the primary air can be transported through the primary air duct. The primary air duct is connected to the secondary air box, and then the surplus primary air can be used to achieve a one-to-two effect without increasing any additional energy consumption, which is beneficial to improving the efficiency of the boiler.

[0005] Further preferably, the control assembly includes a connecting flange, the connecting flange is fixedly connected to one end of the primary air duct, and fixing bolts are movably connected to both sides of the connecting flange.

[0006] Further preferably, the control component also includes an isolation valve, which is fixedly installed inside the connecting flange, a manual control lever is fixedly connected to the top of the isolation valve, a remote receiving module is fixedly installed on the front of the isolation valve, and a valve stem is movably connected inside the isolation valve. By installing the control component, the secondary air box and the primary air box can be controllably connected through the cooperation between the connecting flange and the fixing bolt, and then the required air volume is controlled through the isolation valve stem by utilizing the principle that the primary air pressure is higher than the secondary air pressure. The isolation valve can be remotely controlled by the DCS using the remote receiving module, thereby achieving the purpose of not shutting down the boiler for maintenance without adding additional equipment, and is simple and easy to install.

[0007] Further preferably, the boiler assembly includes a support rod, which is fixedly connected to the upper surface of the supporting base plate, and the top of the support rod is fixedly connected to a mounting ring, a combustion furnace body is fixedly mounted inside the mounting ring, and the bottom of the combustion furnace body is fixedly connected to an air inlet pipe, and the other end of the air inlet pipe is fixedly connected to one side of the primary air duct.

[0008] Further preferably, the other end of the secondary air duct is fixedly connected to one side of the combustion furnace body, and a heat dissipation net is fixedly installed on one side of the primary air blower compartment.

[0009] Compared with the prior art, the utility model has the following beneficial effects:

[0010] In the utility model, by installing the air volume component, the cooperation between the primary wind box and the primary fan compartment and other components can be realized to generate primary wind by utilizing the primary fan motor and fan blades, and transport it through the primary air duct. The primary air duct is connected to the secondary wind box, and then the surplus of the primary air can be utilized to achieve a one-to-two effect without increasing any additional energy consumption, which is beneficial to improving the efficiency of the boiler.

[0011] In the utility model, by installing the control component, the secondary air box and the primary air box can be controllably connected through the cooperation between the connecting flange and the fixing bolt, and then the required air volume is controlled through the isolation valve stem by utilizing the principle that the primary air pressure is higher than the secondary air pressure. The isolation valve can be remotely controlled by the DCS using the remote receiving module, thereby achieving the purpose of not stopping the boiler for maintenance without adding additional equipment, and is simple and easy to install. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0013] Figure 2 This is a schematic diagram of the front view structure of the utility model;

[0014] Figure 3 This is a schematic diagram of the cross-sectional structure of the utility model;

[0015] Figure 4 For this utility model Figure 1 The enlarged structural diagram at A in the middle;

[0016] Figure 5 For this utility model Figure 3 Enlarged structural diagram at B in the middle.

[0017] In the figure: 1. bearing base plate; 2. air volume assembly; 201. primary air box; 202. primary fan compartment; 203. primary fan motor and fan blades; 204. primary air duct; 205. secondary air box; 206. secondary fan compartment; 207. secondary fan motor and fan blades; 208. secondary air duct; 3. control assembly; 301. connecting flange; 302. fixing bolt; 303. isolation valve; 304. manual control lever; 305. remote receiving module; 306. valve stem; 4. boiler assembly; 401. support rod; 402. mounting ring; 403. combustion furnace body; 404. air inlet pipe; 5. heat dissipation net. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1-Figure 5 The utility model provides a technical solution: a coal-fired boiler capable of supplementing secondary air volume, comprising a bearing base plate 1, an air volume assembly 2 is arranged above the bearing base plate 1, a control assembly 3 is arranged above the bearing base plate 1, a boiler assembly 4 is arranged above the bearing base plate 1, the air volume assembly 2 comprises a primary wind box 201, the primary wind box 201 is fixedly mounted on the upper surface of the bearing base plate 1, a primary fan compartment 202 is fixedly arranged on one side of the primary wind box 201, a primary fan motor and fan blades 203 are fixedly mounted inside the primary fan compartment 202, and a primary air duct 204 is fixedly connected to the other side of the primary wind box 201.

[0020] In this embodiment, Figure 1 , Figure 3 and Figure 5 As shown, the air volume component 2 also includes a secondary air box 205, which is fixedly mounted on the upper surface of the supporting base plate 1, a secondary air fan compartment 206 is fixedly arranged on one side of the secondary air box 205, a secondary air fan motor and fan blades 207 are fixedly mounted inside the secondary air compartment 206, a secondary air duct 208 is fixedly connected to the top of the secondary air box 205, and the primary air duct 204 is fixedly connected to one side of the secondary air box 205.

[0021] In this embodiment, Figure 1 , Figure 3 and Figure 4 As shown, the control assembly 3 includes a connecting flange 301 , which is fixedly connected to one end of the primary air duct 204 , and fixing bolts 302 are movably connected to both sides of the connecting flange 301 .

[0022] In this embodiment, Figure 1 , Figure 3 and Figure 4 As shown, the control component 3 also includes an isolation valve 303, which is fixedly installed inside the connecting flange 301, a manual control rod 304 is fixedly connected to the top of the isolation valve 303, a remote receiving module 305 is fixedly installed on the front of the isolation valve 303, and a valve stem 306 is movably connected inside the isolation valve 303.

[0023] In this embodiment, Figure 1 , Figure 2 and Figure 3As shown, the boiler assembly 4 includes a support rod 401, which is fixedly connected to the upper surface of the supporting base plate 1, and a mounting ring 402 is fixedly connected to the top of the support rod 401, and a combustion furnace body 403 is fixedly installed inside the mounting ring 402. The bottom of the combustion furnace body 403 is fixedly connected to an air inlet pipe 404, and the other end of the air inlet pipe 404 is fixedly connected to one side of the primary air duct 204.

[0024] In this embodiment, Figure 1 , Figure 2 and Figure 3 As shown, the other end of the secondary air duct 208 is fixedly connected to one side of the combustion furnace body 403, and a heat dissipation net 5 is fixedly installed on one side of the primary air machine chamber 202.

[0025] The use method and advantages of the utility model: The coal-fired boiler that can supplement the secondary air volume, when in use, the working process is as follows:

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, first, by installing the air volume component 2, the cooperation between the primary air box 201 and the primary fan compartment 202 and other components can be used to generate primary air using the primary fan motor and the fan blades 203, and transport it through the primary air duct 204. The primary air duct 204 is connected to the secondary air box 205, and then the surplus of the primary air can be used without increasing any additional energy consumption to achieve a one-to-two effect, which is beneficial to improving the efficiency of the boiler. Then, by installing the control component 3, the cooperation between the connecting flange 301 and the fixing bolt 302 and other components can be used to achieve a controllable connection between the secondary air box 205 and the primary air box 201. Then, using the principle that the primary air pressure is higher than the secondary air pressure, the required air volume is controlled by the valve stem 306 of the isolation valve 303. The isolation valve 303 can be remotely controlled by the DCS using the remote receiving module 305, so that the boiler does not need to be shut down during maintenance without adding additional equipment, and it is simple and easy to install.

[0027] The above shows and describes the basic principle, main features and advantages of the utility model. Technical staff in this industry should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A coal-fired boiler capable of supplementing secondary air volume, comprising a bearing bottom plate (1), characterized in that: An air volume component (2) is arranged above the bearing base plate (1), a control component (3) is arranged above the bearing base plate (1), and a boiler component (4) is arranged above the bearing base plate (1). The air volume component (2) comprises a primary wind box (201), the primary wind box (201) is fixedly mounted on the upper surface of the bearing base plate (1), a primary fan compartment (202) is fixedly arranged on one side of the primary wind box (201), a primary fan motor and fan blades (203) are fixedly mounted inside the primary fan compartment (202), and the other side of the primary wind box (201) is fixedly connected to a primary air duct (204).

2. A coal-fired boiler capable of supplementing secondary air volume according to claim 1, characterized in that: The air volume assembly (2) further comprises a secondary air box (205), the secondary air box (205) being fixedly mounted on the upper surface of the bearing base plate (1), a secondary air machine compartment (206) being fixedly arranged on one side of the secondary air box (205), a secondary air machine motor and fan blades (207) being fixedly mounted inside the secondary air machine compartment (206), a secondary air duct (208) being fixedly connected to the top of the secondary air box (205), and the primary air duct (204) being fixedly connected to one side of the secondary air box (205).

3. A coal-fired boiler capable of supplementing secondary air volume according to claim 2, characterized in that: The control assembly (3) comprises a connecting flange (301), wherein the connecting flange (301) is fixedly connected to one end of the primary air duct (204), and fixing bolts (302) are movably connected to both sides of the connecting flange (301).

4. A coal-fired boiler capable of supplementing secondary air volume according to claim 3, characterized in that: The control assembly (3) further comprises an isolation valve (303), wherein the isolation valve (303) is fixedly mounted inside the connecting flange (301), a manual control rod (304) is fixedly connected to the top of the isolation valve (303), a remote receiving module (305) is fixedly mounted on the front of the isolation valve (303), and a valve stem (306) is movably connected inside the isolation valve (303).

5. A coal-fired boiler capable of supplementing secondary air volume according to claim 4, characterized in that: The boiler assembly (4) comprises a support rod (401), wherein the support rod (401) is fixedly connected to the upper surface of the bearing base plate (1), a mounting ring (402) is fixedly connected to the top of the support rod (401), a combustion furnace body (403) is fixedly mounted inside the mounting ring (402), the bottom of the combustion furnace body (403) is fixedly connected to an air inlet pipe (404), and the other end of the air inlet pipe (404) is fixedly connected to one side of the primary air pipe (204).

6. A coal-fired boiler capable of supplementing secondary air volume according to claim 5, characterized in that: The other end of the secondary air duct (208) is fixedly connected to one side of the combustion furnace body (403), and a heat dissipation net (5) is fixedly installed on one side of the primary air fan compartment (202).

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