A primary air structure suitable for a biomass water-cooled vibrating grate straw boiler

Abstract

The utility model belongs to the field of grate technology, concretely is a primary air structure suitable for biomass water -cooling vibration grate straw boiler, it includes water -cooling grate face, the drying section primary air chamber, the combustion section primary air chamber and the burnout section primary air chamber are provided with below water -cooling grate face, drying section primary air chamber, combustion section primary air chamber and burnout section primary air chamber all are connected primary hot -blast air flue, install hot -blast air electric gate valve on primary hot -blast air flue, its characterized in that, every primary hot -blast air flue is provided with primary cold air bypass air flue, install cold air electric gate valve on primary cold air bypass air flue.

Description

Technical Field

[0001] This utility model belongs to the field of grate technology, specifically a primary air structure suitable for biomass water-cooled vibrating grate straw boilers. Background Technology

[0002] Biomass energy is a clean, renewable, and environmentally friendly energy source, significantly different from traditional fossil fuels. Its core fuel characteristics are high moisture content, high volatile matter, low ash content, and low melting point, making biomass fuel easy to ignite and quick to start, but difficult to burn completely. Currently, the mainstream boilers burning biomass fuel include direct-fired water-cooled vibrating grate boilers. This type of boiler offers stable and complete combustion of biomass and is less prone to coking. However, due to the high moisture content, high volatile matter, low ash content, and low melting point of biomass fuel, sufficient residence time and abundant air are required on the grate surface to ensure complete combustion when using grate combustion. For traditional direct-fired water-cooled vibrating grate boilers, the primary and secondary air temperatures remain essentially constant during combustion. Even if the fuel composition changes, the air temperature cannot be adjusted accordingly, resulting in poor fuel adaptability.

[0003] Biomass fuels, depending on their composition, have significantly different primary air temperature requirements for drying, combustion, and burnout during combustion. Typically, for direct-fired water-cooled vibrating grate boilers, the required primary air drying temperature for burning biomass fuels is between 80℃ and 120℃, and the required primary air combustion temperature is between 150℃ and 200℃. Due to its difficult-to-burn characteristic, the primary air temperature in the burnout stage is higher than at the earlier stages, ranging from 200℃ to 250℃. Traditional direct-fired water-cooled vibrating grate boilers, in pursuit of a convenient flue gas system structure, such as... Figure 1 As shown, no precise temperature control measures were considered for the primary air temperature, resulting in significant energy waste and incomplete combustion during the combustion of biomass fuel. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a primary air structure suitable for biomass water-cooled vibrating grate straw boilers, which can reasonably configure the primary air temperature, improve the fuel burnout rate, save energy, and improve combustion efficiency.

[0005] The technical solution is as follows: a primary air structure suitable for a biomass water-cooled vibrating grate straw boiler, comprising a water-cooled grate surface, and below the water-cooled grate surface are arranged a drying section primary air chamber, a combustion section primary air chamber, and a burnout section primary air chamber, all of which are connected to a primary hot air duct. A hot air electric gate valve is installed on the primary hot air duct. The key feature is that each of the primary hot air ducts is provided with a primary cold air bypass duct, and a cold air electric gate valve is installed on the primary cold air bypass duct.

[0006] A further feature is that both sides of the primary air chamber of the drying section, the primary air chamber of the combustion section, and the primary air chamber of the burnout section are connected to primary hot air ducts.

[0007] By adopting this utility model, an additional primary cold air bypass duct can be added, which can maintain the air temperature of the primary air chambers in the drying section, combustion section, and burnout section within the range of primary air temperatures required for drying, combustion, and burnout. This improves the adaptability to biomass fuel, increases the fuel burnout rate, saves energy, and enhances combustion efficiency. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of existing technology; Figure 2 This is the front view of the present utility model; Figure 3 This is a top view of the present invention. Detailed Implementation

[0009] See Figure 2 and Figure 3 As shown, a primary air structure suitable for a biomass water-cooled vibrating grate straw boiler includes a water-cooled grate surface 1. Below the water-cooled grate surface 1 are a drying section primary air chamber 2, a combustion section primary air chamber 3, and a burnout section primary air chamber 4. The combustion section primary air chamber 3 is divided into two. Both sides of the drying section primary air chamber 2, the combustion section primary air chamber 3, and the burnout section primary air chamber 4 are connected to primary hot air ducts 5. A hot air electric gate valve 6 is installed on the primary hot air duct 5. A primary cold air bypass duct 7 is provided on each primary hot air duct 5. A cold air electric gate valve 8 is installed on the primary cold air bypass duct 7.

[0010] In the improved system, fuel enters the drying section of the water-cooled grate surface 1 through the feed inlet via the feeding equipment. The primary air temperature in the primary air chamber 2 of the drying section can be controlled and regulated by the original hot air electric gate valve 6 and the newly added cold air electric gate valve 8 to maintain the air temperature within the range required for drying the fuel. After the grate vibrates, the fuel passes through the drying section and enters the combustion section. At this time, the hot air electric gate valve 6 and the cold air electric gate valve 8 in the combustion section are adjusted to control the air temperature in the primary air chamber 3 of the combustion section within the range required for the combustion section. The fuel then enters the burnout section, where the primary air temperature can be adjusted using the same operation to keep it within a reasonable range. Finally, the fuel is completely burned and enters the slag hopper, where it is removed by the slag remover.

[0011] In this application, only one air preheater is needed to raise the air temperature to the maximum, and then the required air temperature is obtained by mixing cold air. This is suitable for drying sections and combustion sections, etc., and only one air supply system is needed.

Claims

1. A primary air structure suitable for a biomass water-cooled vibrating grate straw boiler, comprising a water-cooled grate surface, and below the water-cooled grate surface are arranged a drying section primary air chamber, a combustion section primary air chamber, and a burnout section primary air chamber, all of which are connected to a primary hot air duct, and a hot air electric gate valve is installed on the primary hot air duct, characterized in that, Each of the primary hot air ducts is provided with a primary cold air bypass duct, and a cold air electric gate valve is installed on the primary cold air bypass duct.

2. The primary air structure for a biomass water-cooled vibrating grate straw boiler according to claim 1, characterized in that, Both sides of the primary air chamber of the drying section, the primary air chamber of the combustion section, and the primary air chamber of the burnout section are connected to primary hot air ducts.

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