Denitration equipment for removing NOx from flue gas of biomass boiler

Abstract

The utility model relates to the technical field of denitration, in particular to denitration equipment for removing NOx from flue gas of a biomass boiler, which comprises a denitration box body, a flue gas inlet is arranged on one side of the denitration box body, a flue gas outlet is arranged on the other side of the denitration box body, a reaction cavity is arranged inside the denitration box body, and the flue gas inlet is communicated with the reaction cavity. An ozone spray pipe is arranged on the outer side of the denitration box body and communicated with the interior of the reaction cavity, and an ozone recovery device is fixedly arranged at the outer end of the other side of the denitration box body; the unreacted ozone is recycled through the ozone recycling device, impurities in the unreacted ozone are purified, the concentration of the ozone in the unreacted ozone is detected, and if the concentration of the ozone in the purified and monitored gas is high enough, the purified and monitored gas can be introduced into the reaction system again so as to continue to participate in the denitration reaction, and escape of the ozone is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of denitration, in particular to a denitration device for removing NOx from the flue gas of a biomass boiler. Background Technique

[0002] Due to the variety of fuel types, low calorific value, and poor feeding uniformity of biomass boilers, the temperature change in the combustion zone is violent, and the initial nitrogen oxide emission concentration at the boiler outlet fluctuates greatly.

[0003] For biomass boilers, the first thing in denitration is to stabilize the concentration of NOx at the furnace outlet. The acceptable flue gas denitration methods for biomass include: SNCR denitration technology, SCR denitration technology, ozone oxidation denitration technology, strong oxidant denitration technology, etc.

[0004] For ozone oxidation denitration technology, during the denitration process, the utilization rate of ozone may not always be very high, and some ozone may escape into the atmosphere, which not only reduces the denitration efficiency but also may pose potential hazards to the environment and human health.

[0005] Therefore, it is necessary to design a denitration device for removing NOx from the flue gas of a biomass boiler to solve the above-mentioned problems. Content of the Utility Model

[0006] The purpose of the utility model is to provide a denitration device for removing NOx from the flue gas of a biomass boiler to solve the problems mentioned in the above background technique.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] A denitration device for removing NOx from the flue gas of a biomass boiler includes a denitration box body. One side of the denitration box body is provided with a flue gas inlet, the other side of the denitration box body is provided with a flue gas outlet, a reaction cavity is arranged inside the denitration box body, an ozone spray pipe is installed outside the denitration box body and communicated with the inside of the reaction cavity, and an ozone recovery device is fixedly installed at the outer end of the other side of the denitration box body.

[0009] As a preferred scheme of the utility model, the ozone recovery device includes recovery pipelines connected to the upper and lower sides of the denitration box body. A switch valve, a filtering component, a concentration regulating valve, a recovery fan, and a three-way switch are respectively arranged on the recovery pipelines. Both sides of the recovery pipelines are fixedly connected to the outer shells of the denitration box body near the upper and lower ends respectively.

[0010] As a preferred scheme of the utility model, the inside of the filtering component is provided with an activated carbon plate and a polymer membrane. The inside of the activated carbon plate is provided with activated carbon, and the polymer membrane adopts fluorocarbon polymer membrane materials such as polytetrafluoroethylene PTFE and polyvinylidene fluoride PVDF.

[0011] As a preferred solution of the present utility model, a detachable maintenance port is provided on the outer casing of the filtering assembly, and the maintenance port is fixedly connected to the outer casing of the filtering assembly through a plurality of screws.

[0012] As a preferred solution of the present utility model, a concentration monitoring instrument is also fixedly provided on the concentration regulating valve, and the concentration regulating valve and the recovery pipeline are fixedly connected by nuts.

[0013] As a preferred solution of the present utility model, the ozone spray pipe is composed of a flange, a spray pipe body and a spray port, and the number of ozone spray pipes is determined based on the amount of ozone entering the flue.

[0014] Beneficial effects: In view of the problem that in the prior art, during the denitrification process of the ozone oxidation denitrification technology, the utilization rate of ozone may not always be very high, and some ozone may escape into the atmosphere, which not only reduces the denitrification efficiency, but also may cause potential harm to the environment and human health. In the present utility model, an ozone recovery device is communicated outside the original denitrification box body, so that the unreacted ozone is recovered and utilized through the ozone recovery device, the impurities inside are purified, and the ozone concentration inside is detected. If the ozone concentration in the gas after purification and monitoring is high enough, it can be introduced into the reaction system again to continue to participate in the denitrification reaction, avoiding the escape of ozone, which is very practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall three-dimensional view of a denitrification device for removing NOx from the flue gas of a biomass boiler according to the present utility model;

[0016] Figure 2 It is a schematic structural diagram of an ozone recovery device of a denitrification device for removing NOx from the flue gas of a biomass boiler according to the present utility model;

[0017] Figure 3 It is a schematic internal structure diagram of the filtering assembly according to the present utility model;

[0018] Figure 4 It is a schematic structural diagram of the polymer membrane according to the present utility model.

[0019] In the figure: 1, denitrification box body; 2, flue gas inlet; 3, flue gas outlet; 4, reaction cavity; 5, ozone spray pipe; 6, ozone recovery device; 61, recovery pipeline; 62, switch valve; 63, filtering assembly; 631, activated carbon plate; 632, polymer membrane; 64, recovery fan; 65, three-way switch; 66, concentration regulating valve; 661, concentration monitoring instrument; 67, nut. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0021] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant. Several embodiments of the present utility model are given. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present utility model more thorough and comprehensive.

[0022] It should be noted that when an element is referred to as being "fixedly installed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the specification of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0024] Please refer to Figures 1-4 , the present utility model provides a technical solution:

[0025] A denitration device for removing NOx from the flue gas of a biomass boiler, comprising a denitration box body 1, a flue gas inlet 2 is provided on one side of the denitration box body 1, a flue gas outlet 3 is provided on the other side of the denitration box body 1, a reaction cavity 4 is arranged inside the denitration box body 1, an ozone spray pipe 5 is installed outside the denitration box body 1 and communicated to the inside of the reaction cavity 4, and an ozone recovery device 6 is fixedly installed at the outer end of the other side of the denitration box body 1.

[0026] Specifically, the ozone recovery device 6 includes recovery pipelines 61 connected to the upper and lower sides of the denitration box body 1. A switch valve 62, a filtration component 63, a concentration adjustment valve 66, a recovery fan 64, and a three-way switch 65 are respectively arranged on the recovery pipelines 61. Both sides of the recovery pipelines 61 are fixedly connected to the outer shells of the denitration box body 1 near the upper and lower ends. An activated carbon plate 631 and a polymer membrane 632 are arranged inside the filtration component 63. Activated carbon is arranged inside the activated carbon plate 631. The polymer membrane 632 adopts fluorocarbon polymer membrane materials such as polytetrafluoroethylene PTFE and polyvinylidene fluoride PVDF. A detachable maintenance port is arranged on the outer shell of the filtration component 63, and the maintenance port is fixedly connected to the outer shell of the filtration component 63 through a plurality of screws. A concentration monitoring instrument 661 is also fixedly arranged on the concentration adjustment valve 66, and the concentration adjustment valve 66 and the recovery pipelines 61 are fixedly connected by a nut 67. The ozone spray pipe 5 is composed of a flange, a spray pipe body, and a spray port. The number of ozone spray pipes 5 is determined based on the amount of ozone entering the flue. Ozone gas is sent into the reaction cavity 4 through the ozone spray pipe 5 to react with NOx in the flue gas to generate highly water-soluble higher-valent NOx. The subsequent unreacted ozone will be recovered into the recovery pipelines 61 under the action of the recovery fan 64 and purified through the activated carbon plate 631 and the polymer membrane 632 inside the filtration component 63. The activated carbon plate 631 adsorbs the impurities inside the ozone, and the polymer membrane 632 can intercept the impurities inside the ozone and allow the ozone gas to pass through. After purification, the concentration monitoring instrument 661 can detect the ozone concentration. When the ozone concentration in the gas after purification and monitoring is high enough, it can be introduced into the reaction system again through the connection of the three-way switch 65 to continue participating in the denitration reaction, while the ozone with insufficiently high concentration can be collected uniformly for other uses. For example, ozone can be used for disinfection, sterilization, or oxidation treatment of other pollutants, etc., thus avoiding ozone escape.

[0027] Preferably, a number of temperature sensors are further arranged inside the reaction cavity 4 to detect the temperature during the reaction, so that the reaction can be carried out at a suitable temperature.

[0028] In summary, the utility model can realize the recovery and utilization of unreacted ozone, purify the impurities inside it, detect the ozone concentration inside it. If the ozone concentration in the gas after purification and monitoring is high enough, it can be introduced into the reaction system again to continue participating in the denitration reaction, avoiding ozone escape, which is very practical.

[0029] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A denitrification device for removing NOx from flue gas of a biomass boiler, comprising a denitrification box (1), characterized in that: A flue gas inlet (2) is provided on one side of the denitration box (1), a flue gas outlet (3) is provided on the other side of the denitration box (1), a reaction chamber (4) is arranged inside the denitration box (1), an ozone nozzle (5) is installed on the outside of the denitration box (1) and connected to the inside of the reaction chamber (4), and an ozone recovery device (6) is fixedly installed on the outer end of the other side of the denitration box (1).

2. The denitrification equipment for removing NOx from flue gas of biomass boiler according to claim 1 is characterized by: The ozone recovery device (6) comprises a recovery pipe (61) connected to the upper and lower sides of the denitration box (1); the recovery pipe (61) is respectively provided with a switch valve (62), a filter assembly (63), a concentration regulating valve (66), a recovery fan (64) and a three-way switch (65); and the two sides of the recovery pipe (61) are respectively fixedly connected to the outer shell of the denitration box (1) at the upper and lower ends.

3. The denitrification equipment for removing NOx from flue gas of biomass boiler according to claim 2 is characterized by: An activated carbon plate (631) and a polymer membrane (632) are arranged inside the filter component (63); activated carbon is arranged inside the activated carbon plate (631); and the polymer membrane (632) is made of fluorocarbon polymer membrane materials such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF).

4. The denitrification equipment for removing NOx from flue gas of biomass boiler according to claim 2 is characterized by: The outer shell of the filter assembly (63) is provided with a detachable inspection port, and the inspection port is fixedly connected to the outer shell of the filter assembly (63) by a plurality of screws.

5. The denitrification equipment for removing NOx from flue gas of biomass boiler according to claim 2 is characterized by: The concentration regulating valve (66) is also fixedly provided with a concentration monitoring instrument (661), and the concentration regulating valve (66) and the recovery pipeline (61) are fixedly connected by a nut (67).

6. The denitrification equipment for removing NOx from flue gas of biomass boiler according to claim 1, characterized in that: The ozone nozzle (5) is composed of a flange, a nozzle body and a nozzle port. The number of the ozone nozzles (5) is determined based on the amount of ozone entering the flue.

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