CN204513420U - The waste gas combustion furnace that low nitrogen burning combines with non-selective catalytic reduction denitration - Google Patents

Abstract

The utility model discloses the waste gas combustion furnace that a kind of low nitrogen burning combines with non-selective catalytic reduction denitration, it comprises: burner (1), the cylindrical shell (2) be connected with burner (1), be arranged on the saddle (3) of cylindrical shell (2) downside, be arranged on the castable refractory (4) in cylindrical shell (2); Burner (1) is provided with First air entrance (1-1), exhaust gas entrance (1-2) and gas inlet (1-3); Cylindrical shell (2) is provided with Secondary Air entrance (2-1), secondary air chamber (2-2), Secondary Air jet pipe (2-3), circulating flue gas entrance (2-4), circulating flue gas jet pipe (2-6), ammoniacal liquor jet pipe (2-7) and exhanst gas outlet (2-8).The waste gas combustion furnace that the utility model provides, reasonable in design, easy to operate, while effectively can reducing equipment cost, greatly reduce NOx emission, improve burn-off rate, the feature of environmental protection is strong, and applicability is good, has important using value.

Description

Waste gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction denitrification

technical field

The utility model relates to an incinerator, in particular to a waste gas incinerator which can be used in petroleum, chemical industry and other industries and has denitrification effect by selective catalytic reduction method .

Background technique

With the development of modern industry, human beings emit more and more NOx into the atmosphere, more than 90% of which come from the combustion of fossil fuels such as coal, oil, and natural gas. A large amount of NOx emissions not only cause acid rain, photochemical smog and PM2.5 (formed by fine particles adsorbing pollutants such as NOx and SO ₂ ) to seriously pollute the environment, but also cause great harm to human health.

Now all countries in the world have put forward higher and higher requirements for NOx emissions. my country's "Twelfth Five-Year Plan" for pollutant emission reduction also included NOx control as an emission reduction target for the first time. By 2015, the total national NOx emissions will be controlled at 20.462 million tons , 10% less than the 22.736 million tons in 2010. In order to effectively control pollutant emissions, the Ministry of Environmental Protection has issued a series of stricter NOx emission standards, and relevant enterprises must adopt high-efficiency denitrification and low-nitrogen combustion technologies to control NOx emissions. There are three kinds of denitrification methods currently used: low nitrogen combustion denitrification, selective catalytic reduction (SCR) denitrification and non-selective catalytic reduction (SNCR) denitrification. Low-nitrogen combustion technology should be the preferred technology for nitrogen oxide control in waste gas recovery and treatment. It has low investment cost, no operating cost, and does not add any denitrification reducing agent. The generation of NOx can be controlled from the source only by adjusting the combustion method, but Pollutant emission requirements cannot be met only through low-nitrogen combustion technology. Although SCR technology is the most effective technology for controlling NOx emissions, it has high denitrification efficiency and low ammonia slip rate, but the core device of the system is the catalyst, whose cost accounts for 30-40% of the total cost of the denitrification device. The catalyst used is expensive and susceptible to multiple These factors affect the failure, which is unbearable for most small and medium-sized enterprises.

Therefore, it is very necessary to design and develop a kind of exhaust gas with reasonable structure design, which can significantly improve the removal efficiency of NOx and reduce NOx emissions based on the technology of the existing technology. Incinerator.

Utility model content

Purpose of the utility model: The purpose of this utility model is to solve the problems of low denitrification efficiency and high equipment cost at present, and design a low-nitrogen combustion and non-nitrogen combustion with reasonable structure design and convenient operation, which can significantly improve the removal efficiency of NOx and reduce NOx emissions. Waste gas incinerator combined with selective catalytic reduction denitrification technology.

Technical scheme: in order to realize above object, the technical scheme that the utility model takes is:

A waste gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction method denitrification, which includes: a burner, a cylinder connected to the burner, a saddle installed on the lower side of the cylinder, and a refractory cylinder installed in the cylinder. Casting material; the burner is provided with a primary air inlet, a waste gas inlet and a natural gas inlet;

The cylinder body is provided with a secondary air inlet, a secondary air chamber, a secondary air nozzle, a circulating flue gas inlet, a circulating flue gas nozzle, an ammonia water nozzle and a flue gas outlet.

As a preferred solution, the above-mentioned waste gas incinerator combining low-nitrogen combustion and non-selective catalytic reduction denitrification, the burner is inserted horizontally on the central axis of the cylinder.

As a preferred solution, in the above-mentioned waste gas incinerator combining low-nitrogen combustion and non-selective catalytic reduction denitrification, the cylinder is a horizontal cylindrical double-layer sleeve, including the inner layer of the cylinder and the outer layer of the cylinder. A circulating smoke chamber is formed between the inner layer and the outer layer of the cylinder.

As a preferred solution, in the above-mentioned waste gas incinerator combining low-nitrogen combustion and non-selective catalytic reduction denitrification, the secondary air inlet is located at the front of the cylinder, and the distance from the front panel of the cylinder to the main flame length , the circulating flue gas inlet is located at the tail of the outer layer of the cylinder.

As a preferred solution, the waste gas incinerator combined with the above-mentioned low-nitrogen combustion and non-selective catalytic reduction method denitrification, the secondary air chamber is ring-shaped, preferably 12 secondary air nozzles, and the secondary air nozzle The circumference of the pipe is evenly distributed on the secondary air chamber and passes through the refractory castable.

As a preferred solution, in the above-mentioned waste gas incinerator combining low-nitrogen combustion and non-selective catalytic reduction denitrification, the circular flue gas nozzles are evenly distributed on the inner layer of the cylinder and pass through the refractory castable.

As a preferred solution, in the above-mentioned waste gas incinerator combining low-nitrogen combustion and non-selective catalytic reduction denitrification, the distribution position of the circulating flue gas nozzles is a group of 20 front ends, and the direction is the axial direction of the cylinder. There are 3 groups in the middle, 16 in each group, and the direction is at an angle of 45° to the axial direction of the cylinder.

As a preferred solution, in the waste gas incinerator combined with the above-mentioned low-nitrogen combustion and non-selective catalytic reduction method denitrification, the ammonia water nozzles are evenly distributed on the upper half circumference of the part connected to the flue at the tail of the cylinder, preferably 8 root.

The exhaust gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction (SNCR) technology described in the utility model, the primary air is axial, and the air distribution coefficient is α=0.8 to maintain a reducing atmosphere and control combustion temperature and NOx formation. The secondary air injects excess air vertically and evenly in the middle of the flame, so that the exhaust gas, gas and air are fully mixed and burned.

The exhaust gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction (SNCR) technology described in the utility model, the circulating flue gas is injected into the furnace through the circulating flue gas chamber to the front and middle of the furnace, effectively isolating Thermal insulation can further eliminate NOx while lowering the temperature of the furnace wall, and group injection at a 45° angle can enhance mixing and increase burnout rate.

The exhaust gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction (SNCR) technology described in the utility model, the ammonia water pipe is located at the tail of the cylinder connected to the flue, which can remove the remaining NOx in the flue gas Effectively eliminated.

Beneficial effects: the waste gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction (SNCR) technology described in the utility model has the following advantages compared with the prior art:

The waste gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction (SNCR) technology described in the utility model has reasonable structural design and convenient operation, which can effectively reduce equipment costs and greatly reduce NOx emissions and improve combustion efficiency. As efficient as possible, strong in environmental protection, good in applicability, and has important application value.

Description of drawings

Fig. 1 is a cross-sectional view of an exhaust gas incinerator combining low-nitrogen combustion and non-selective catalytic reduction denitrification technology described in the present invention.

Fig. 2 is a left view of the waste gas incinerator combined with the low-nitrogen combustion and non-selective catalytic reduction denitrification technology described in the present invention.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, further set forth the utility model, should be understood that these embodiments are only used for illustrating the utility model and are not intended to limit the scope of the utility model, after having read the utility model, those skilled in the art will understand this utility model The modifications of various equivalent forms of the utility model all fall within the scope defined by the appended claims of the present application.

As shown in Figure 1 and Figure 2, a waste gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction denitrification is characterized in that it includes: a burner (1), connected to the burner (1) Cylinder (2), the saddle (3) installed on the lower side of the cylinder (2), the refractory castable (4) installed in the cylinder (2); the burner (1) is provided with a primary Air inlet (1-1), waste gas inlet (1-2) and natural gas inlet (1-3);

The cylinder (2) is provided with a secondary air inlet (2-1), a secondary air chamber (2-2), a secondary air nozzle (2-3), a circulating flue gas inlet (2-4 ), circulating flue gas nozzle (2-6), ammonia water nozzle (2-7) and flue gas outlet (2-8).

In the above-mentioned waste gas incinerator combining low-nitrogen combustion and non-selective catalytic reduction denitrification, the burner (1) is horizontally inserted on the central axis of the cylinder (2).

In the waste gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction denitrification described above, the cylinder (2) is a horizontal cylindrical double-layer sleeve, including the inner layer of the cylinder and the outer layer of the cylinder. A circulating flue gas chamber (2-5) is formed between the layer and the outer layer of the cylinder.

In the waste gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction denitrification described above, the secondary air inlet (2-1) is located at the front of the cylinder (2), and the cylinder (2) The distance between the front panel and the main flame is the length, and the circulating flue gas inlet (2-4) is located at the tail of the outer layer of the barrel (2).

The waste gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction denitrification described above, the secondary air chamber (2-2) is annular, and the secondary air nozzles (2-3) are evenly distributed around the circumference On the secondary air chamber (2-2), and pass through the refractory castable (4).

In the waste gas incinerator that combines low-nitrogen combustion and non-selective catalytic reduction denitrification described above, the circular flue gas nozzles (2-6) are uniformly distributed on the inner layer of the cylinder (2) and pass through the Refractory castables (4). Among them, the circulating flue gas nozzles (2-6) are distributed in a group of 20 at the front end, the direction is the axial direction of the cylinder (2), and there are 3 groups in the middle, 16 in each group, and the direction is in the direction of the cylinder (2) axial direction. 45° angle.

In the exhaust gas incinerator that combines low-nitrogen combustion and non-selective catalytic reduction denitration described above, a total of 8 ammonia water nozzles (2-7) are evenly distributed at the tail of the cylinder (2) connected to the flue. upper half circle.

The waste gas incinerator combined with low-nitrogen combustion and non-selective catalytic reduction (SNCR) technology provided by the utility model has a reasonable structural design, can effectively reduce equipment costs, greatly reduce NOx emissions, and increase burnout rate. Broad prospects.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (8)

1. the waste gas combustion furnace that combines with non-selective catalytic reduction denitration of a low nitrogen burning, it is characterized in that, it comprises: burner (1), the cylindrical shell (2) be connected with burner (1), be arranged on the saddle (3) of cylindrical shell (2) downside, be arranged on the castable refractory (4) in cylindrical shell (2); Described burner (1) is provided with First air entrance (1-1), exhaust gas entrance (1-2) and gas inlet (1-3);

Described cylindrical shell (2) is provided with Secondary Air entrance (2-1), secondary air chamber (2-2), Secondary Air jet pipe (2-3), circulating flue gas entrance (2-4), circulating flue gas jet pipe (2-6), ammoniacal liquor jet pipe (2-7) and exhanst gas outlet (2-8).

2. the waste gas combustion furnace that combines with non-selective catalytic reduction denitration of low nitrogen burning according to claim 1, it is characterized in that, described burner (1) level is inserted on the central shaft of cylindrical shell (2).

3. the waste gas combustion furnace that combines with non-selective catalytic reduction denitration of low nitrogen burning according to claim 1, it is characterized in that, described cylindrical shell (2) is Horizontal cylinder shape double layer sleeve barrel, comprise barrel inner and cylindrical shell skin, between barrel inner and cylindrical shell skin, form circulating flue gas room (2-5).

4. the waste gas combustion furnace that combines with non-selective catalytic reduction denitration of low nitrogen burning according to claim 1, it is characterized in that, described Secondary Air entrance (2-1) is positioned at the front portion of cylindrical shell (2), be the main length of flame with cylindrical shell (2) front console distance, described circulating flue gas entrance (2-4) is positioned at cylindrical shell (2) outer field afterbody.

5. the waste gas combustion furnace that the low nitrogen burning according to any one of Claims 1-4 combines with non-selective catalytic reduction denitration, it is characterized in that, described secondary air chamber (2-2) is annular, Secondary Air jet pipe (2-3) circumference uniform distribution on secondary air chamber (2-2), and passes castable refractory (4).

6. the waste gas combustion furnace that combines with non-selective catalytic reduction denitration of low nitrogen burning according to claim 5, is characterized in that, described circulating flue gas jet pipe (2-6) circumference uniform distribution in cylindrical shell (2) internal layer, and through castable refractory (4).

7. the waste gas combustion furnace that combines with non-selective catalytic reduction denitration of low nitrogen burning according to claim 6, it is characterized in that, described circulating flue gas jet pipe (2-6) distributing position is one group 20, front end, direction is that cylindrical shell (2) is axial, 3 groups, middle part, often organize 16, direction is axially in 45° angle with cylindrical shell (2).

8. the waste gas combustion furnace that combines with non-selective catalytic reduction denitration of low nitrogen burning according to claim 7, is characterized in that, described ammoniacal liquor jet pipe (2-7) is evenly distributed on the upper semicircumference that cylindrical shell (2) afterbody connects flue portion.