Pulverized coal boiler device capable of reducing dust at tail of flue
By using the cold air from the primary fan of the coal powder boiler, the ash accumulation at the tail of the flue is cleaned through the regular and automatic soot blowing pipeline system, the flue gas deviation and manpower cleaning consumption caused by the ash accumulation at the tail of the flue are solved, and automatic cleaning is achieved, reducing manpower investment.
Patent Information
- Application Number
- CN202421490257.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The tail of the flue of the pulverized coal boiler is prone to accumulation of dust, and the flue gas is deviated during operation, which is particularly labor-intensive when cleaning.
Using the cold air of the primary fan of the boiler, the ash accumulated at the tail of the flue is automatically blown regularly through the soot blowing pipeline. A small hole is provided at the end of the soot blowing pipeline to blow soot into the inner wall of the tail of the flue, and the soot blowing operation is controlled by the soot valve.
Automatic and timed cleaning of dust accumulation at the tail of the flue is realized, reducing the need for manpower cleaning, and no additional steam or additional fan is required.
Smart Images
Figure CN222864975U_ABST
Abstract
Description
Technical Field
[0001] The utility model provides a pulverized coal boiler device for reducing dust at the tail end of a flue, belonging to boiler equipment. Background Art
[0002] After the boiler has been running for a long time, dust is easily accumulated at the tail end of the flue, and the flue gas is deviated during operation, which is particularly labor-intensive to clean. Utility Model Content
[0003] In view of this, in order to solve the problem of ash accumulation in the flue of the above-mentioned pulverized coal boiler, the utility model provides a pulverized coal boiler device for reducing dust at the tail end of the flue. The device utilizes the cold air of the boiler's primary fan to automatically and regularly blow away the ash at the tail end of the flue without the need for additional steam soot blowing or the addition of a fan for soot blowing.
[0004] The utility model adopts the following technical solutions to achieve the above technical effects:
[0005] A pulverized coal boiler device for reducing dust at the tail end of a flue comprises an air preheater located in the flue and a primary fan for blowing pulverized coal into a burner; further comprising a soot blowing pipeline; the air outlet of the primary fan is divided into two paths through a pipeline, one of which is a cold air pipeline, the end of which is connected to the cold air inlet of the air preheater, and the other is a coal blowing pipeline, the end of which is connected to a coal mill; the hot air outlet of the air preheater is connected to the coal blowing pipeline through a hot air pipeline;
[0006] One end of the soot blowing pipeline is connected to the cold air pipeline, and the other end extends to the tail of the flue; a solenoid valve is arranged on the soot blowing pipeline.
[0007] Furthermore, a plurality of small holes are arranged in an array on the pipe wall of the soot blowing pipe extending into the tail end of the flue, so as to blow soot on the inner wall of the tail end of the flue.
[0008] Furthermore, a portion of the soot blowing pipeline located in the tail section of the flue has a distance greater than zero from the inner wall of the tail section of the flue, and the small hole for soot blowing faces the inner wall of the tail section of the flue.
[0009] Furthermore, it also includes a steam drum, an economizer and a superheater; the economizer is located in the vertical section at the tail end of the flue and is used to heat the boiler feed water; the steam drum is located at the top of the boiler, one end of which is connected to the water supply of the economizer and the other end is connected to the superheater for conveying saturated steam to the superheater.
[0010] Furthermore, a burner is provided inside the furnace of the boiler, and the pulverized coal pipe of the pulverizer is connected to the burner.
[0011] Furthermore, a dust collector, an induced draft fan, a desulfurization island and a chimney are sequentially arranged at the end of the flue.
[0012] Compared with the prior art, the beneficial effects achieved by the utility model are:
[0013] The utility model utilizes the cold wind of the primary fan of the boiler, which can not only automatically and regularly blow away the accumulated ash at the tail of the flue, but also does not need to use extra steam for ash blowing or add a fan for ash blowing. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a simplified structural diagram of an embodiment of the utility model;
[0015] Figure 2 It is a partial structural diagram of an embodiment of the utility model.
[0016] In the figure: 1-furnace, 2-burner, 3-pulverizer, 4-primary fan, 5-steam drum, 6-superheater, 7-economizer, 8-air preheater, 9-dust collector, 10-induced draft fan, 11-desulfurization island, 12-chimney, 13-soot blowing pipeline, 14-cold air pipeline, 15-hot air pipeline, 16-,
[0017] 11- Roller, DETAILED DESCRIPTION
[0018] Below, the utility model is further described in conjunction with the accompanying drawings.
[0019] Reference Figure 1 and Figure 2 The boiler device disclosed in this embodiment includes an air preheater located in the flue and a primary fan for blowing coal powder into the burner; it also includes an ash blowing pipeline; the air outlet of the primary fan is divided into two paths through a pipeline, one of which is a cold air pipeline, the end of which is connected to the cold air inlet of the air preheater, and the other is a coal blowing pipeline, the end of which is connected to the coal mill; the hot air outlet of the air preheater is connected to the coal blowing pipeline through a hot air pipeline; the air preheater. Located in the flue at the rear of the boiler, its function is to use the waste heat of the flue gas to heat the air required for fuel combustion, which can not only further reduce the exhaust gas temperature, but also is beneficial for strengthening the combustion in the furnace, improving the economy of combustion, and drying and conveying coal powder. The boiler efficiency can be increased by about 2%.
[0020] One end of the soot blowing pipeline is connected to the cold air pipeline, and the other end extends to the tail of the flue; a solenoid valve is arranged on the soot blowing pipeline.
[0021] There are several small holes arrayed on the pipe wall of the soot blowing pipe extending into the tail end of the flue, which serves as a perforated air duct. The perforated air duct is located inside the tail end of the flue, and the air duct is connected to the primary air duct outlet of the boiler; the solenoid valve is installed in the middle of the air duct, and the two are flange-mounted for soot blowing on the inner wall of the tail end of the flue.
[0022] The economizer is located in the vertical section at the tail of the flue and is used to heat the boiler feed water; the steam drum is located at the top of the boiler, one end of which is connected to the water from the economizer and the other end is connected to the superheater for conveying saturated steam to the superheater. The function of the superheater is to heat the saturated steam from the steam drum into superheated steam with a certain temperature.
[0023] The furnace of the boiler is equipped with a burner, and the coal powder pipe of the pulverizer is connected to the burner. The end of the flue is also equipped with a dust collector, an induced draft fan, a desulfurization island and a chimney.
Claims
1. A pulverized coal boiler device for reducing dust at the tail end of a flue, comprising an air preheater located in the flue and a primary fan for blowing pulverized coal into a burner; characterized in that: It also includes a soot blowing pipeline; the air outlet of the primary fan is divided into two paths through a pipeline, one of which is a cold air pipeline, the end of which is connected to the cold air inlet of the air preheater, and the other is a coal blowing pipeline, the end of which is connected to the coal mill; the hot air outlet of the air preheater is connected to the coal blowing pipeline through a hot air pipeline; One end of the soot blowing pipeline is connected to the cold air pipeline, and the other end extends to the tail of the flue; a solenoid valve is arranged on the soot blowing pipeline.
2. A pulverized coal boiler device for reducing dust at the tail end of a flue according to claim 1, characterized in that: A plurality of small holes are arranged in an array on the pipe wall of the part of the soot blowing pipe extending into the tail end of the flue, which are used for soot blowing on the inner wall of the tail end of the flue.
3. A pulverized coal boiler device for reducing dust at the tail end of a flue according to claim 2, characterized in that: The part of the soot blowing pipeline located in the flue tail has a distance greater than zero from the inner wall of the flue tail, and the small hole used for soot blowing faces the inner wall of the flue tail.
4. A pulverized coal boiler device for reducing dust at the tail end of a flue according to claim 1, characterized in that: It also includes a steam drum, an economizer and a superheater; the economizer is located in the vertical section at the tail end of the flue and is used to heat the boiler feed water; the steam drum is located at the top of the boiler, one end of which is connected to the water supply of the economizer and the other end is connected to the superheater for conveying saturated steam to the superheater.
5. A pulverized coal boiler device for reducing dust at the tail end of a flue according to claim 1, characterized in that: A burner is arranged inside the furnace of the boiler, and the pulverized coal pipe of the coal mill is connected to the burner.
6. A pulverized coal boiler device for reducing dust at the tail end of a flue according to claim 1, characterized in that: A dust collector, an induced draft fan, a desulfurization island and a chimney are arranged in sequence at the end of the flue.