Combined desulfurization and denitrification system in annealing furnace

Abstract

The utility model discloses a combined desulfurization and denitrification system in an annealing furnace. The device comprises a hearth, a primary tuyere, a secondary tuyere, a denitration agent feeding port and a smoke exhaust port, the primary tuyere is located in the middle of the bottom end of the hearth, the four secondary tuyeres are located in the four side walls of the lower portion of the hearth respectively, the denitration agent feeding port is located in the side wall face of the upper portion of the hearth, and the smoke outlet is located in the top end of the hearth. According to the utility model, under the combined action of primary air and secondary air, the combustion condition in the annealing furnace is in a spiral rising form, so that the heat and mass transfer process in the furnace is enhanced.

Description

Technical Field

[0001] This utility model relates to the field of flue gas purification technology, and in particular to a combined desulfurization and denitrification system in an annealing furnace. Background Technology

[0002] In modern industrial production, annealing furnaces are indispensable key equipment in many metal processing industries. However, annealing furnaces generate large amounts of flue gas containing sulfur oxides (SOx) and nitrogen oxides (NOx) during operation. With increasing global attention to environmental protection, countries have established increasingly stringent emission standards for air pollutants, limiting the emission of SOx and NOx from industrial flue gas.

[0003] The complexity of the combustion process inside the furnace reduces the controllability of the desulfurization and denitrification processes superimposed on the furnace. Traditional desulfurization and denitrification technologies suffer from problems such as complex equipment, difficult maintenance, low desulfurization and denitrification efficiency, and poor economic efficiency. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this utility model proposes a combined desulfurization and denitrification system and method in an annealing furnace.

[0005] This utility model is achieved using the following technical solution:

[0006] An in-furnace combined desulfurization and denitrification system includes a furnace, a primary air inlet, a secondary air inlet, a denitrification agent feeding port, and a flue gas outlet; the primary air inlet is located at the bottom middle of the furnace, the four secondary air inlets are located on the four side walls of the lower part of the furnace, the denitrification agent feeding port is located on the upper side wall of the furnace, and the flue gas outlet is located at the top of the furnace.

[0007] In the aforementioned combined desulfurization and denitrification system within an annealing furnace, the desulfurizing agent enters the furnace through the primary air inlet at the bottom center of the furnace along with the primary air.

[0008] In the aforementioned combined desulfurization and denitrification system within an annealing furnace, biochar is used simultaneously as both a desulfurizing agent and a fuel.

[0009] The aforementioned combined desulfurization and denitrification system in an annealing furnace has each secondary air inlet at a 45-degree angle to the furnace sidewall, causing the combustion inside the furnace to exhibit a spiral upward pattern.

[0010] In the aforementioned combined desulfurization and denitrification system within an annealing furnace, ammonia water, the denitrification agent, is sprayed into the furnace through a denitrification agent feeding port on the upper side of the furnace chamber.

[0011] The beneficial and positive effects of this utility model are:

[0012] This utility model discloses a combined desulfurization and denitrification system in an annealing furnace. The desulfurizing agent is biochar obtained from the pyrolysis of waste crop straw, which broadens the application field of agricultural waste.

[0013] This utility model discloses a combined desulfurization and denitrification system in an annealing furnace. The biochar that enters the furnace with the primary air is used not only as a desulfurizing agent but also as fuel, which meets the development needs of the dual carbon target.

[0014] This utility model discloses a combined desulfurization and denitrification system in an annealing furnace. Under the combined action of primary and secondary air, the combustion state in the annealing furnace presents a spiral upward form, which enhances the heat and mass transfer process in the furnace.

[0015] This utility model discloses a combined desulfurization and denitrification system in an annealing furnace. The denitrification agent inlet is arranged on the upper side of the furnace. Combustion in the furnace is basically completed, and the addition of the denitrification agent has little impact on the combustion process in the furnace.

[0016] This utility model discloses a combined desulfurization and denitrification system in an annealing furnace. The system can select the number of flue gas outlets at the top of the furnace to be opened or closed according to the combustion conditions inside the furnace, making the annealing furnace highly adaptable and improving the economic efficiency of its operation. Attached Figure Description

[0017] Figure 1 This is a front view of a combined desulfurization and denitrification system within an annealing furnace.

[0018] Figure 2 yes Figure 1 A cross-sectional view of the vertical structure along the AA direction;

[0019] Figure 3 This is a top view of a combined desulfurization and denitrification system within an annealing furnace. Detailed Implementation

[0020] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0021] like Figure 1 , Figure 2 and Figure 3 As shown, this embodiment includes a primary air outlet 1, four secondary air outlets 2, a denitrification agent feeding port 3, and four smoke exhaust outlets 4.

[0022] When the annealing furnace starts operating, biochar obtained from the pyrolysis of crop straw enters the furnace along with primary air from primary tuyer 1 at the bottom center of the furnace. Due to its high calorific value, biochar releases a large amount of heat during combustion, significantly reducing fuel consumption in the annealing furnace. Furthermore, biochar has a large specific surface area, contains various active functional groups and alkaline components (high pH value), resulting in significant desulfurization within the furnace. Secondary air is introduced into the furnace at an angle from four secondary tuyer tuyer 1-1, 2-2, 2-3, and 2-4, respectively, positioned at a 45-degree angle to the furnace sidewall. Together with the primary air, this creates a spiraling upward combustion flow field. Additionally, the secondary air volume and velocity are adjusted in real-time based on the combustion conditions within the furnace and the rated excess air coefficient to optimize the economical operation of the annealing furnace. The amount of denitrification agent injected is adjusted by detecting the nitrogen oxide content in the flue gas; the denitrification agent feed port 3 is located on the upper side of the furnace, minimizing its impact on the combustion process. Because the combustion process inside the furnace is complex, four exhaust ports are evenly arranged at the top of the furnace: exhaust port 1 4-1, exhaust port 2 4-2, exhaust port 3 4-3, and exhaust port 4-4. The number of exhaust ports 4 at the top of the furnace can be selected to be opened or closed according to the actual situation, thereby adjusting the speed field and temperature field of combustion inside the furnace and improving the economic efficiency of the annealing furnace operation.

[0023] The above embodiments are only used to illustrate the present utility model and are not limited to the technical solutions described in the present utility model. However, the present utility model is not limited to the specific embodiments described above. Any device or solution that modifies or substitutes the present utility model and is similar to the basic principle of the present utility model is within the protection scope of the present utility model.

Claims

1. A combined desulfurization and denitrification system in an annealing furnace, characterized in that, The furnace comprises a furnace chamber, a primary air inlet, a secondary air inlet, a denitration agent feeding port and a smoke outlet; the primary air inlet is located at the middle of the bottom end of the furnace chamber; the four secondary air inlets are respectively located at the four side walls of the lower part of the furnace chamber; the denitration agent feeding port is located at the upper side wall of the furnace chamber; and the smoke outlet is located at the top end of the furnace chamber.

2. The combined desulfurization and denitrification system in an annealing furnace according to claim 1, characterized in that, The desulfurizing agent enters the furnace chamber through the primary air inlet at the middle of the bottom end of the furnace chamber along with the primary air.

3. The combined desulfurization and denitrification system in an annealing furnace according to claim 1, characterized in that, Each secondary air inlet forms a 45-degree angle with the side wall of the furnace chamber, so that the combustion in the furnace presents a spiral upward form.

4. The combined desulfurization and denitrification system in an annealing furnace according to claim 1, wherein The denitration agent ammonia water is sprayed into the furnace through the denitration agent feeding port at the upper side of the furnace chamber.

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