A high efficiency pulverized coal boiler

Abstract

The utility model relates to a boiler technical field, concretely is a kind of high -efficient coal powder boiler, it can effectively improve combustion efficiency, reduce the generation of NOx, and the residue quantity is small, it includes hearth, horizontal flue, turning chamber, rising flue and tail flue, it is characterized in that, the front wall water-cooled wall of hearth is provided with cyclone coal powder burner, the bottom of hearth is provided with ash cooling air system and furnace bottom pneumatic ash handling device, the top of hearth is provided with high-temperature superheater in the junction of horizontal flue, low-temperature superheater is provided in horizontal flue, upper group coal economizer is provided in turning chamber, SCR denitration device, air preheater one, lower group coal economizer, air preheater two are sequentially provided in tail flue from top to bottom.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, specifically to a high-efficiency pulverized coal boiler. Background Technology

[0002] Small and medium-sized enterprises often use small-capacity, low-parameter steam in their production processes, so they need to configure a high-efficiency, low-emission pulverized coal boiler to save production costs and improve production efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, this utility model provides a small-capacity, low-parameter pulverized coal boiler, which can effectively improve combustion efficiency, reduce NOx generation, and minimize ash discharge.

[0004] The technical solution is as follows: A high-efficiency pulverized coal boiler includes a furnace, a horizontal flue, a turning chamber, an ascending flue, and a tail flue. The furnace is characterized by having a swirl pulverized coal burner installed on its front water-cooled wall; an ash cooling air system and a bottom pneumatic ash conveying device installed at the bottom of the furnace; a high-temperature superheater installed at the connection between the top of the furnace and the horizontal flue; a low-temperature superheater installed inside the horizontal flue; an upper economizer installed inside the turning chamber; and an SCR denitrification device, an air preheater (first unit), a lower economizer, and an air preheater (second unit) sequentially arranged from top to bottom inside the tail flue.

[0005] A further feature is that the swirl pulverized coal burners are arranged in layers on the front water-cooled wall;

[0006] The bottom of the furnace is connected to an ash hopper, and the bottom of the ash hopper is equipped with the furnace bottom pneumatic ash conveying device. The ash and slag cooling air system includes an air outlet located in the furnace and the ash hopper, and the air outlet is connected to a cooling air inlet pipe.

[0007] A steam drum is installed at the top of the furnace, and a downcomer connected to the steam drum is located between the rear wall of the furnace and the tail flue.

[0008] By adopting this utility model, a high combustion efficiency is achieved using a swirl pulverized coal burner, resulting in low NOx production and reduced slag discharge. Furthermore, the fine slag particles are cooled by the ash cooling air system and discharged through the pneumatic ash conveying device at the bottom of the furnace. The SCR denitrification device in the tail flue can further reduce NOx emissions. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0010] See Figure 1As shown, a high-efficiency pulverized coal boiler includes a furnace 1, a horizontal flue 2, a turning chamber 3, an ascending flue 4, and a tail flue 5. The front water-cooled wall of the furnace 1 is equipped with a swirl pulverized coal burner 6, which is arranged in layers and is model C-XLMF-34R. Compared with conventional pulverized coal burners, the swirl pulverized coal burner 6 has the characteristics of high combustion efficiency, low NOx production, small slag discharge, and fine slag particle size. The bottom of the furnace 1 is connected to an ash hopper 7, and the bottom of the ash hopper 7 is equipped with a bottom pneumatic ash conveying device 8, which can easily complete the ash and slag discharge. An ash and slag cooling air system 9 is also provided. The ash and slag cooling air system 9 includes air outlets located in the furnace 1 and the ash hopper 7, and the air outlets are connected to cooling air inlet pipes, which can easily reduce the temperature of the ash and slag.

[0011] A high-temperature superheater 10 is installed at the connection between the top of the furnace 1 and the horizontal flue 2. A low-temperature superheater 11 is installed inside the horizontal flue 2. An upper economizer 12 is installed inside the turning chamber 3. In the tail flue 6, from top to bottom, an SCR denitrification device 13, an air preheater 14, a lower economizer 15, and an air preheater 16 are sequentially installed. After passing through the SCR denitrification device 13, the flue gas meets the requirements for qualified emission. After passing through the economizer 12 and the air preheater, the flue gas finally reaches a suitable exhaust temperature. After passing through the air preheater, the air is heated to a certain temperature and sent into the furnace 1, which can meet the combustion requirements of pulverized coal.

[0012] A steam drum is installed at the top of the furnace 1. The downcomer 17 connected to the steam drum is located between the rear wall of the furnace 1 and the tail flue 5. This avoids interference between the downcomer 17 and the swirl pulverized coal burner 6 arranged on the front wall. In order to save space in front of the furnace and reduce the boiler footprint, the downcomer is led from the front of the furnace to the rear of the furnace, making full use of the space between the rear wall and the tail.

Claims

1. A high-efficiency pulverized coal boiler, comprising a furnace, a horizontal flue, a turning chamber, an ascending flue, and a tail flue, characterized in that, The front wall of the furnace is equipped with a swirl pulverized coal burner. The bottom of the furnace is equipped with an ash and slag cooling air system and a bottom pneumatic ash conveying device. A high-temperature superheater is installed at the connection between the top of the furnace and the horizontal flue. A low-temperature superheater is installed in the horizontal flue. An upper economizer is installed in the turning chamber. An SCR denitrification device, an air preheater one, a lower economizer, and an air preheater two are installed sequentially from top to bottom in the tail flue.

2. The high-efficiency pulverized coal boiler according to claim 1, characterized in that, The swirl pulverized coal burners are arranged in layers on the front water-cooled wall.

3. The high-efficiency pulverized coal boiler according to claim 1, characterized in that, The bottom of the furnace is connected to an ash hopper, and the bottom of the ash hopper is equipped with the furnace bottom pneumatic ash conveying device. The ash and slag cooling air system includes an air outlet located in the furnace and the ash hopper, and the air outlet is connected to a cooling air inlet pipe.

4. A high-efficiency pulverized coal boiler according to claim 1, characterized in that, A steam drum is installed at the top of the furnace, and a downcomer connected to the steam drum is located between the rear wall of the furnace and the tail flue.

Images