CN217188864U

CN217188864U - Thermal desorption system for catalyst of GGH-free low-temperature denitration device

Info

Publication number: CN217188864U
Application number: CN202221114595.XU
Authority: CN
Inventors: 张妍娜; 张强; 蒋恩宝
Original assignee: Anhui Boguangyun Environmental Protection Technology Co ltd
Current assignee: Anhui Boguangyun Environmental Protection Technology Co ltd
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2022-08-16
Anticipated expiration: 2032-05-09

Abstract

The utility model discloses a catalyst thermal desorption system of a GGH-free low-temperature denitration device, which comprises a hot air system, an air regulating valve, an air fan, an electric heater, a hot air thermometer and a hot air injection grid, wherein the air regulating valve, the air fan, the electric heater, the hot air thermometer and the hot air injection grid are connected in sequence; the SCR reaction system comprises an SCR reactor, wherein the SCR reactor is provided with an inlet flue and an outlet flue; a flue gas switch valve and a flue gas thermometer are arranged on the inlet flue; the hot air injection grille is arranged inside the inlet flue; the smoke discharge system comprises a circulating smoke regulating valve, a smoke discharge thermometer and a smoke discharge fan which are connected in sequence; the circulating flue gas regulating valve is also respectively communicated with the hot air system and the SCR reaction system; the circulating flue gas regulating valve is also connected with a branch with a cooling regulating valve. The utility model discloses realize the thermal analysis of catalyst in the low temperature deNOx systems who does not establish GGH, guarantee catalyst life, maintain system stability, guarantee SCR denitrification facility operation up to standard.

Description

Thermal desorption system for catalyst of GGH-free low-temperature denitration device

Technical Field

The utility model relates to an environmental protection technology field especially indicates a no GGH low temperature denitrification facility catalyst thermal analysis system.

Background

In recent years, the low-temperature SCR denitration technology is widely applied to the field of non-electric denitration, and a mature and reliable technical route is developed: flue gas desulfurization, GGH heating, hot blast stove heating, low-temperature SCR denitration and GGH cooling. However, a large number of practices prove that even if the low-temperature denitration device is arranged after desulfurization, the catalyst still needs to be subjected to irregular thermal desorption, namely, the temperature of flue gas in the denitration device is raised to 350-420 ℃, so that ammonium bisulfate enriched on the catalyst is decomposed and then discharged along with the flue gas, and the catalyst can be ensured to be in normal contact with the flue gas. Experience shows that the heat load of the hot blast stove is most suitable for being designed according to the fact that the temperature of flue gas is increased by 30-50 ℃, so that the GGH plays an important role in recovering heat, improving the temperature of the flue gas at an SCR inlet and reducing the temperature of SCR exhaust gas no matter under the working condition of normal use or under the working condition of catalyst thermal desorption.

However, with the development of low-temperature denitration catalysts, the success rate of low-temperature catalysts at 180-220 ℃ is increasing. For a device with the exhaust gas temperature of 130-180 ℃, for example, sintering flue gas desulfurized by using activated carbon does not need to be provided with GGH, and the temperature of the flue gas is only raised to 30-50 ℃ to reach a denitration temperature range; and for devices with the smoke exhaust temperature of more than 180 ℃, such as part of coke ovens, GGH and hot blast stoves are not provided, and low-temperature denitration can be carried out. The systems do not have GGH to recover heat during thermal desorption of the catalyst, if a mode of directly heating the flue gas to 350-420 ℃ is still adopted, not only is energy consumption huge, but also the induced draft fan is damaged due to overhigh temperature of the flue gas. Therefore, a thermal desorption system of a low-temperature denitration device without GGH needs to be specially designed.

SUMMERY OF THE UTILITY MODEL

The utility model provides a no GGH low temperature denitrification facility catalyst thermal desorption system has solved foretell problem among the prior art.

The technical scheme of the utility model is realized like this:

a catalyst thermal desorption system of a low-temperature denitration device without GGH comprises:

the hot air system comprises an air regulating valve, an air fan, an electric heater, a hot air thermometer and a hot air injection grid which are connected in sequence;

the SCR reaction system comprises an SCR reactor, wherein the SCR reactor is provided with an inlet flue and an outlet flue; a flue gas switch valve and a flue gas thermometer are arranged on the inlet flue; the hot air injection grille is arranged inside the inlet flue;

the smoke discharge system comprises a circulating smoke regulating valve, a smoke discharge thermometer and a smoke discharge fan which are connected in sequence; the circulating flue gas regulating valve is also respectively communicated with the hot air system and the SCR reaction system; the circulating flue gas regulating valve is also connected with a branch with a cooling regulating valve.

Preferably, the hot air injection grille is arranged between the flue gas switch valve and the flue gas thermometer on the inlet flue, namely the flue gas thermometer is arranged at the downstream of the hot air injection grille.

Preferably, two ends of the circulating flue gas regulating valve are respectively communicated with the inlet of the air fan and the outlet flue through pipelines.

Preferably, the smoke exhaust thermometer is installed at the inlet of the smoke exhaust fan and is positioned at the downstream of the interface of the cooling regulating valve and the outlet flue.

And closing the smoke switch valve when thermal desorption is carried out.

The opening degrees of the air regulating valve and the circulating flue gas regulating valve are automatically adjusted according to the hot air thermometer, and the circulating air volume accounts for 20% -50% of the total flow of hot air.

The temperature of hot air at the outlet of the electric heater is 350-420 ℃, and the flow rate of the hot air is 10-15% of the full-load flue gas flow rate of the denitration system.

The opening of the cooling regulating valve is automatically adjusted according to the smoke exhaust thermometer, and the smoke temperature at the inlet of the smoke exhaust fan is not higher than 200 ℃.

The utility model has the advantages that:

the mode of furnace shutdown thermal desorption is adopted, the thermal desorption of the catalyst is completed through a small amount of 350-420 ℃ hot air, the service life of the catalyst is prolonged, and the standard operation of the SCR denitration device is guaranteed. Meanwhile, the thermal analysis energy consumption is further reduced by adopting a mode of circulating partial hot air. The inlet of the induced draft fan is doped with air for cooling, so that the exhaust gas temperature is lower than the designed use temperature of the induced draft fan under the condition of no GGH, and the stable operation of the system is maintained. Overall, low energy consumption thermal resolution is achieved without GGH.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings may be obtained according to these drawings without inventive exercise.

FIG. 1 is a schematic structural diagram of a catalyst thermal desorption system of a GGH-free low-temperature denitration device of the present invention;

in the figure: 1. an air regulating valve; 2. a combustion fan; 3. an electric heater; 4. a hot air thermometer; 5. a hot air injection grid; 6. a circulating flue gas regulating valve; 7. an inlet flue; 8. a flue gas switch valve; 9. a flue gas thermometer; 10. an SCR reactor; 11. an outlet flue; 12. a temperature reduction regulating valve; 13. a smoke discharge thermometer; 14. a smoke exhaust fan.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Fig. 1 shows a schematic structural diagram of a catalyst thermal desorption system of a GGH-free low-temperature denitration device provided by the present invention; the method comprises the following steps:

the hot air system comprises an air regulating valve 1, an air fan 2, an electric heater 3, a hot air thermometer 4 and a hot air injection grid 5 which are connected in sequence.

The SCR reaction system comprises an SCR reactor 10, wherein the SCR reactor 10 is provided with an inlet flue 7 and an outlet flue 11; a flue gas switch valve 8 and a flue gas thermometer 9 are arranged on the inlet flue 7;

the hot air injection grille 5 is installed inside the inlet flue 7, and the flue gas thermometer 9 is installed downstream of the hot air injection grille 5.

The smoke discharge system comprises a circulating smoke regulating valve 6, a smoke discharge thermometer 13 and a smoke discharge fan 14 which are connected in sequence; two ends of the circulating flue gas regulating valve 6 are respectively communicated with an inlet of the air fan 2 and the outlet flue 11 through pipelines; the circulating flue gas regulating valve 6 is also connected with a branch with a cooling regulating valve 12; the smoke thermometer 13 is installed at the inlet of the smoke exhaust fan 14 and is positioned at the downstream of the interface of the temperature reduction regulating valve 12 and the outlet flue 11.

The flue gas switch valve 8 is closed when thermal desorption is performed. Because the system does not have GGH, if the flue gas entering the denitration system is completely heated to the desorption temperature, the energy consumption of the system is huge, and a furnace shutdown thermal desorption mode is adopted for saving energy.

The opening degrees of the air regulating valve 1 and the circulating flue gas regulating valve 6 are automatically adjusted according to the hot air thermometer 4, and the circulating air volume accounts for 20-50% of the total flow of hot air. The circulating air quantity is too small, and the energy consumption of the system is large; the circulating air volume is too large, and pollutants in the exhausted smoke may exceed the standard. Therefore, the regulating valve is arranged to regulate the flow of the circulating hot air.

The temperature of hot air at the outlet of the electric heater 3 is 350-420 ℃, and the flow rate of the hot air is 10-15% of the full-load flue gas flow rate of the denitration system. The key point of the thermal desorption of the catalyst is that the temperature reaches the decomposition temperature of ammonium bisulfate, namely 350-420 ℃. The influence of over-small amount of flue gas is that the overall temperature rise of the system is slow, and pollutants in the flue gas exceed the standard risk; the influence of too small smoke amount is that the energy consumption of the system is high; the hot air flow is most suitable for 10-15% of the full-load flue gas flow of the denitration system during thermal analysis.

The opening degree of the temperature-reducing regulating valve 12 is automatically adjusted according to the smoke discharge thermometer 13, and the temperature of smoke at the inlet of the smoke discharge fan 14 is not higher than 200 ℃.

The mode of furnace shutdown thermal desorption is adopted, the thermal desorption of the catalyst is completed through a small amount of 350-420 ℃ hot air, the service life of the catalyst is prolonged, and the standard operation of the SCR denitration device is guaranteed. Meanwhile, the thermal analysis energy consumption is further reduced by adopting a mode of circulating partial hot air. The inlet of the induced draft fan is doped with air for cooling, the smoke exhaust temperature is lower than the designed use temperature of the induced draft fan, and the stable operation of the system is maintained. Overall, low energy consumption thermal resolution is achieved without GGH.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a no GGH low temperature denitrification facility catalyst thermal analysis system which characterized in that includes:

the SCR reaction system comprises an SCR reactor (10), wherein the SCR reactor (10) is provided with an inlet flue (7) and an outlet flue (11); a flue gas switch valve (8) and a flue gas thermometer (9) are arranged on the inlet flue (7);

the hot air system comprises an air regulating valve (1), an air fan (2), an electric heater (3), a hot air thermometer (4) and a hot air injection grid (5) which are connected in sequence; the hot air injection grille (5) is arranged in the inlet flue (7);

the smoke discharge system comprises a circulating smoke regulating valve (6), a smoke discharge thermometer (13) and a smoke discharge fan (14) which are connected in sequence; the circulating flue gas regulating valve (6) is also respectively communicated with the hot air system and the SCR reaction system; the circulating flue gas regulating valve (6) is also connected with a branch with a cooling regulating valve (12).

2. The GGH-free low-temperature denitration device catalyst thermal analysis system according to claim 1, wherein the hot air injection grid (5) is installed between a flue gas switch valve (8) and a flue gas thermometer (9) on the inlet flue (7).

3. The GGH-free low-temperature denitration device catalyst thermal desorption system as claimed in claim 1, wherein two ends of the circulating flue gas adjusting valve (6) are respectively communicated with the inlet of the air fan (2) and the outlet flue (11) through pipelines.

4. The GGH-free low-temperature denitration device catalyst thermal desorption system according to claim 1, wherein the flue gas thermometer (13) is installed at the inlet of the flue gas blower (14) downstream of the interface of the temperature-reducing regulating valve (12) and the outlet flue (11).